0% SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS) CHEMISTRY PAST QUESTIONS APP Questions will be picked at random from the question bank. You can use the NEXT button to move to the next question, use the PREVĀ button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.Goodluck! 1 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode? Glucose solution Concentrated hydrochloric acid Dilute sodium chloride solution Aqueous copper (ll) tetraoxosulphate (IV) 2 / 80 Category: CHEMISTRY PAST QUESTIONS The crystal layers in graphite are held together by electrostatic forces hydrogen bonds van der Waals' forces covalent bonds 3 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following features of a human skeleton can be determined by carbon-dating? Height Age Mass Race 4 / 80 Category: CHEMISTRY PAST QUESTIONS Elements which belong to the same group in the Periodic Table are characterized by presence of the same number of outermost electrons in the respective atoms difference of 14 atomic mass units between successive members difference of +1 in the oxidation numbers of successive members presence of the same number of electron shells in the respective atoms 5 / 80 Category: CHEMISTRY PAST QUESTIONS Gas molecules are said to be perfectly elastic because they move about in straight lines the volume occupied by them is negligible the distances between them are negligible they collide without loss of energy 6 / 80 Category: CHEMISTRY PAST QUESTIONS The spontaneity of a chemical reaction is determined by the change in the concentration of the reactants free energy of the system temperature of the system pressure applied to the system 7 / 80 Category: CHEMISTRY PAST QUESTIONS Electrovalent compounds are characterized by high melting point strong oxidizing ability solubility in ethanol high molar mass 8 / 80 Category: CHEMISTRY PAST QUESTIONS It can be concluded that gastric juice is a mixture is acidic contains enzymes has pH value of 7 9 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy? 4p 4d 4f 4s 10 / 80 Category: CHEMISTRY PAST QUESTIONS Aluminium is extracted from bauxite magnetite cryolite cassiterite 11 / 80 Category: CHEMISTRY PAST QUESTIONS What is the oxidation number of nitrogen in AI(NO3)3? + 3 + 6 + 5 + 1 12 / 80 Category: CHEMISTRY PAST QUESTIONS If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly covalent ionic metallic dative 13 / 80 Category: CHEMISTRY PAST QUESTIONS Rusting of iron is an example of redox reaction decomposition displacement reaction deliquescence 14 / 80 Category: CHEMISTRY PAST QUESTIONS Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore S decays faster than Q Q emits fewer particles than S S is more stable than Q Q is twice as stable as S 15 / 80 Category: CHEMISTRY PAST QUESTIONS Chemical equilibrium is attained when concentrations of the reactants and products remain constant reactants stop forming the products concentrations of the products are greater than those of the reactants reactants in the system are used up 16 / 80 Category: CHEMISTRY PAST QUESTIONS The presence of unpaired electrons in an atom of a transition metal gives rise to ductility shiny appearance nalleability paramagnetism 17 / 80 Category: CHEMISTRY PAST QUESTIONS The liquid product of the destructive distillation of coal is ammoniacal liquor ethanol kerosene paraffin oil 18 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following is not correct about oxidation number convention? The oxidation number of a/an monatomic ion is equal to its charge element in the free state is zero alkali meta like sodium in its compounds is + 1 atom of a diatomic molecules is + 2 19 / 80 Category: CHEMISTRY PAST QUESTIONS Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of emission combustion diffusion absorption 20 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following properties increases down a group in the Periodic Table? Atomic radius Ionization energy Electon affinity Electronegativity 21 / 80 Category: CHEMISTRY PAST QUESTIONS Chlorine atom forms CI by Losing one electron Gaining one electron Sharing one electron Donating lone pair of electrons 22 / 80 Category: CHEMISTRY PAST QUESTIONS Substances which absorb water from the atmosphere without dissolving in it are said to be insolube anhydrous hygroscopic hydrated 23 / 80 Category: CHEMISTRY PAST QUESTIONS What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s)Ā + 2HCI(aq)Ā ā ZnCIĀ 2(aq)Ā + H2(g)Ā [Zn = 65; 1 mole of a gas occupies 22.4dm3Ā at s.t.p] 0.896dm 3 8.62dm 3 5.82dm 3 0.040dm 3 24 / 80 Category: CHEMISTRY PAST QUESTIONS The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is hydrogen carbon (IV) oxide oxygen sulphur (VI) oxide 25 / 80 Category: CHEMISTRY PAST QUESTIONS An exothermic reaction is one which involves positive change in value of enthalpy evolution of gas as it proceeds attainment of dynamic equilibrium loss of heat to the surrounding 26 / 80 Category: CHEMISTRY PAST QUESTIONS What does āH represent in the following equation ? Cl(g)Ā + e- ā CI-Ā (g); āH = - 363 kJ mol-1 Heat of atomization Dissociation energy Electron affinity lonization energy 27 / 80 Category: CHEMISTRY PAST QUESTIONS A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of alpha particles only alpha particles and gamma rays beta particles and gamma rays alpha and beta particles 28 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following statements about ideal gases is/are correct?I. The cohesive forces between their particles are negligiblell. The have no definite volume but occupy the volume of their containersIII. They are not compressibleIV. Their particles collide with loss of energy l, ll and lll only l and ll only l only l, ll, lll, and IV 29 / 80 Category: CHEMISTRY PAST QUESTIONS A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by sublimation distillation filtration evaporation 30 / 80 Category: CHEMISTRY PAST QUESTIONS What is responsible for metallic bonding? Attraction between the atomic unclei and cloud of electrons Sharing of electrons between the metal atoms transfer of electrons from one atom to another Attraction between positive and negative ions 31 / 80 Category: CHEMISTRY PAST QUESTIONS Elactrostatic force of attraction between sodium ion and halide ion is greatest in NaF NaI NaBr NaCI 32 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following methods is suitable for the preparation of an insoluble salt? Action of an acid on a metal Action of an acid on a trioxocarbonate (IV) Double decomposition Neutralisation 33 / 80 Category: CHEMISTRY PAST QUESTIONS What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SOĀ 2(aq)Ā + 2H2S(g)Ā ā 3SĀ (s)Ā + 2HĀ 2OĀ (l) Acid Bleaching agent Oxidising agent Dehydrating agent 34 / 80 Category: CHEMISTRY PAST QUESTIONS If the solubility of KHCO3Ā is 0.40 mole dm-3 40.0g 10.0g 4.0g 100.0g 35 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following would dissolve in warm dilute H2SO4Ā without effervescence, to give a blue solution? Copper (ll) trioxocarbonate (IV) Copper alloy Copper turnings Copper (ll) oxide 36 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the following equation: Ag+Ā (aq)Ā + CI-(aq)Ā ā Ag+CI-Ā (s)Ā ; āH = _65.7 kJmol-1. From the equation, it can be deduced that the reaction is endothermic and occurs at high temperature a solid is formed and heat is evolved direct combination is involved and the reaction is endothermic activation energy is high and a catalyst is required 37 / 80 Category: CHEMISTRY PAST QUESTIONS A radioactive solid is best stored in a cool, dark cupboard under paraffin oil in a box lined with lead under ultraviolet light 38 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following lowers the activation energy of a chemical reaction? Reducing agent Catalyst Freezing mixture Water 39 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will displace copper from a solution of copper (ll) salt? Aluminium ions Zinc ions Magnesium Silver 40 / 80 Category: CHEMISTRY PAST QUESTIONS PĀ TotalĀ = F1Ā + P2Ā + PĀ 3Ā + .........Pn'Ā where PĀ TotalĀ is the pressure of a mixture of gasses. The equation above is an expression of Gay-Lussac's Law Boyle's law Graham's law Dalton's law 41 / 80 Category: CHEMISTRY PAST QUESTIONS A reaction is represented by the equation below. A2(g)Ā + B2(g)Ā 2AB(g); āH = +X kJmol-1Ā Which of the following statements about the system is correct? The reaction goes to completion at equilibrium At equilibrium increase in temperature favours the reverse reaction The forward reaction is exthermic Pressure has no effect on the equilibrium mixture 42 / 80 Category: CHEMISTRY PAST QUESTIONS A concentrated solution containing H+, Cu2+,OH-Ā and CI-Ā was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods? Cu2+ CI- OH- H+ 43 / 80 Category: CHEMISTRY PAST QUESTIONS What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g)Ā N2(g)Ā + 3H2(g) the concentration of ammonia will increase the reaction will go to completion Activation energy will decrease the forward reaction will be favoured 44 / 80 Category: CHEMISTRY PAST QUESTIONS What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3Ā ā 3Cu(NO3)2Ā + 2NO + 4H2O Hydrogen Copper Oxygen Nitrogen 45 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following substances decomposes when an electric current is passed through it? Tetrachlormethane Glucose solution Zinc rod Hydrochloric acid 46 / 80 Category: CHEMISTRY PAST QUESTIONS Equal volumes of CO2Ā cnd CO at s.t.p have the same mass density number of molecules rate of diffusion 47 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following can undergo both addition reactions and substitution reactions? Pentane Hexane Benzene Propene 48 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following procedures is suitable for identifying the food colouring added to a pastry sample? The cathode becomes coated with copper The anode increases in mass The blue colour of the solution fades gradually Both electrodes gain electrons 49 / 80 Category: CHEMISTRY PAST QUESTIONS What is the value of x in the following equation? Cr2O72-Ā + 14H+Ā + xe- ā 2Cr3+Ā + 7H2O 8 6 1 12 50 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following non-metals reacts most readily with metals? Chlorine Carbon Nitrogen Sulphur 51 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to give an alkaline solution? Potassium oxide Sodium chloride Ammonium chloride Sulphur (IV) oxide 52 / 80 Category: CHEMISTRY PAST QUESTIONS The atoms of four elements are represented asĀ 20Q,Ā 16R,Ā 10S andĀ 8T Which of the elements would be unreactive? R S T Q 53 / 80 Category: CHEMISTRY PAST QUESTIONS What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C] 18g 0.635g 0.318g 6.35g 54 / 80 Category: CHEMISTRY PAST QUESTIONS Helium is preferred to hydrogen in filling balloons because hydrogen is diatomic is inflammable is a component of water exhibits isotopy 55 / 80 Category: CHEMISTRY PAST QUESTIONS Pauli Exclusion Principle is related to collision theory of reaction rates reversiblility of equlibrium reactions quantum numbers of electrons electronegativity values of elements 56 / 80 Category: CHEMISTRY PAST QUESTIONS In the Periodic Table, the elements that loss electrons most readily belong to Group V11 A Group 111 A Group 1 A Group 11 A 57 / 80 Category: CHEMISTRY PAST QUESTIONS What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3? Dehydration Nutralization Redox reaction Destructive distillation 58 / 80 Category: CHEMISTRY PAST QUESTIONS Pipe-borne water is usually chlorinated in order to improve the teste of the water kill harmful bacteria in the water remove the hardness in the water clear coagulate sediments in the water 59 / 80 Category: CHEMISTRY PAST QUESTIONS 0.10 mol dm-3Ā NaCI conducts electricity better than 0.10 mol dm-3Ā CH3COOH because the solution of NaCI is neutral to litmus has a higher pH has a lower molar mass contains more ions 60 / 80 Category: CHEMISTRY PAST QUESTIONS One mole of a compound M(HCO3)2Ā has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] 53 40 101 122 61 / 80 Category: CHEMISTRY PAST QUESTIONS A finely divided from of a metal burns more readily in air than the rod from because the rod has protective oxide coating higher molar mass different chemical properties smaller surface area 62 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following occurs when a solution of CuSO4Ā is electrolysed using copper electrodes? The blue colour of the solution fades gradually The cathode becomes coated with copper Both electrodes gain electrons The anode increases in mass 63 / 80 Category: CHEMISTRY PAST QUESTIONS When alkanols react with sodium, the ga evolved is ethyne hydrogen methane oxygen 64 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following movements can be described as random motion? planets going round the sun gas molecules colliding in a flask wheelbarrow being pushed car travelling on a straight line 65 / 80 Category: CHEMISTRY PAST QUESTIONS Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible? Q + S+ ā S + Q+ S + Q+ ā Q + S+ S + P+ ā P + S + R + P+ ā P + R+ 66 / 80 Category: CHEMISTRY PAST QUESTIONS What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2Ā + O2Ā ā 2SO3; āH = - xKJmol-1 Increases the collision rate of reactant particles Shifts equilibrium position to the right Reduces the time for attainment of equilibrium Decreases the value of āH 67 / 80 Category: CHEMISTRY PAST QUESTIONS The property of calcium chloride which makes it useful as a drying agent is that it is a normal salt ionic deliquescent a strong electrolyte 68 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the reaction represented by the following equation: H2(g)Ā + 12(g)Ā ā 2HI(g). The number of effective collisions of molecules of the reactants decreases as the pressure increased the temperature is raised the volume of the system is increased a catalysty is intoduced into the system 69 / 80 Category: CHEMISTRY PAST QUESTIONS Metals are said to be malleable because they are good conductors of electricity can be alloyed are good conductors heat can be beaten into sheets 70 / 80 Category: CHEMISTRY PAST QUESTIONS What is the shape of a molecule of CCI4? Trigonal planar Linear Tetrahedral Pyramidal 71 / 80 Category: CHEMISTRY PAST QUESTIONS Petrol consists mainly of alktanols polymers alkanoates hydrocarbons 72 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to form a solution with pH below 7? Ammonium chloride Sodium trioxocarbonate (IV) Potassium hydroxide Sodium tetraoxosulphate (VI) 73 / 80 Category: CHEMISTRY PAST QUESTIONS 30cm3Ā pf hydrogen at s.t.p combine with 20cm3Ā of oxygen to form steam according to the following equation 2H2(g)Ā + O2(g)Ā ā 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction 25cm cube 50cm cube 35cm cube 30cm cube 74 / 80 Category: CHEMISTRY PAST QUESTIONS Calcium atom ionizes by gaining two protons losing two electrons gaining two electrons sharing two electrons 75 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following contains co-ordinate covalent bond? Na+CI CH4 NH4 HCI 76 / 80 Category: CHEMISTRY PAST QUESTIONS How many electrons are removed from Cr2-Ā when it is oxidized to CrO42-? 8 2 4 0 77 / 80 Category: CHEMISTRY PAST QUESTIONS The type of chemical bond that exists between potassium and oxygen in potassium oxide is covalent dative metallic ionic 78 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following pairs of reagents recat to produce hydrogen? Copper and dilute hydrochloric acid Zinc and concentrated trioxonitrate (V) acid Water and calcium dicarbide Magnesium and dilute tetraoxosulphate (VI) acid 79 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following increases as boiling water changes to steam? activation energy degree of disorder in the system temperature of the system number of molecules 80 / 80 Category: CHEMISTRY PAST QUESTIONS Dehydration of ethanol produces ethanoic acid ethene ethanal propan-1,2,3-triol Your score is 0% Restart quiz
SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)
CHEMISTRY PAST QUESTIONS APP
Questions will be picked at random from the question bank.
You can use the NEXT button to move to the next question, use the PREVĀ button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.
Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.
Goodluck!
1 / 80
Category: CHEMISTRY PAST QUESTIONS
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
2 / 80
The crystal layers in graphite are held together by
3 / 80
Which of the following features of a human skeleton can be determined by carbon-dating?
4 / 80
Elements which belong to the same group in the Periodic Table are characterized by
5 / 80
Gas molecules are said to be perfectly elastic because
6 / 80
The spontaneity of a chemical reaction is determined by the change in the
7 / 80
Electrovalent compounds are characterized by
8 / 80
It can be concluded that gastric juice
9 / 80
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
10 / 80
Aluminium is extracted from
11 / 80
What is the oxidation number of nitrogen in AI(NO3)3?
12 / 80
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly
13 / 80
Rusting of iron is an example of
14 / 80
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
15 / 80
Chemical equilibrium is attained when
16 / 80
The presence of unpaired electrons in an atom of a transition metal gives rise to
17 / 80
The liquid product of the destructive distillation of coal is
18 / 80
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
19 / 80
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
20 / 80
Which of the following properties increases down a group in the Periodic Table?
21 / 80
Chlorine atom forms CI by
22 / 80
Substances which absorb water from the atmosphere without dissolving in it are said to be
23 / 80
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s)Ā + 2HCI(aq)Ā ā ZnCIĀ 2(aq)Ā + H2(g)Ā [Zn = 65; 1 mole of a gas occupies 22.4dm3Ā at s.t.p]
24 / 80
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
25 / 80
An exothermic reaction is one which involves
26 / 80
What does āH represent in the following equation ? Cl(g)Ā + e- ā CI-Ā (g); āH = - 363 kJ mol-1
27 / 80
A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of
28 / 80
Which of the following statements about ideal gases is/are correct?
I. The cohesive forces between their particles are negligible
ll. The have no definite volume but occupy the volume of their containers
III. They are not compressible
IV. Their particles collide with loss of energy
29 / 80
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
30 / 80
What is responsible for metallic bonding?
31 / 80
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
32 / 80
Which of the following methods is suitable for the preparation of an insoluble salt?
33 / 80
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SOĀ 2(aq)Ā + 2H2S(g)Ā ā 3SĀ (s)Ā + 2HĀ 2OĀ (l)
34 / 80
If the solubility of KHCO3Ā is 0.40 mole dm-3
35 / 80
Which of the following would dissolve in warm dilute H2SO4Ā without effervescence, to give a blue solution?
36 / 80
Consider the following equation: Ag+Ā (aq)Ā + CI-(aq)Ā ā Ag+CI-Ā (s)Ā ; āH = _65.7 kJmol-1. From the equation, it can be deduced that
37 / 80
A radioactive solid is best stored
38 / 80
Which of the following lowers the activation energy of a chemical reaction?
39 / 80
Which of the following will displace copper from a solution of copper (ll) salt?
40 / 80
PĀ TotalĀ = F1Ā + P2Ā + PĀ 3Ā + .........Pn'Ā where PĀ TotalĀ is the pressure of a mixture of gasses. The equation above is an expression of
41 / 80
A reaction is represented by the equation below. A2(g)Ā + B2(g)Ā 2AB(g); āH = +X kJmol-1Ā Which of the following statements about the system is correct?
42 / 80
A concentrated solution containing H+, Cu2+,OH-Ā and CI-Ā was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
43 / 80
What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g)Ā N2(g)Ā + 3H2(g)
44 / 80
What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3Ā ā 3Cu(NO3)2Ā + 2NO + 4H2O
45 / 80
Which of the following substances decomposes when an electric current is passed through it?
46 / 80
Equal volumes of CO2Ā cnd CO at s.t.p have the same
47 / 80
Which of the following can undergo both addition reactions and substitution reactions?
48 / 80
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?
49 / 80
What is the value of x in the following equation? Cr2O72-Ā + 14H+Ā + xe- ā 2Cr3+Ā + 7H2O
50 / 80
Which of the following non-metals reacts most readily with metals?
51 / 80
Which of the following compounds dissolves in water to give an alkaline solution?
52 / 80
The atoms of four elements are represented asĀ 20Q,Ā 16R,Ā 10S andĀ 8T Which of the elements would be unreactive?
53 / 80
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
54 / 80
Helium is preferred to hydrogen in filling balloons because hydrogen
55 / 80
Pauli Exclusion Principle is related to
56 / 80
In the Periodic Table, the elements that loss electrons most readily belong to
57 / 80
What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?
58 / 80
Pipe-borne water is usually chlorinated in order to
59 / 80
0.10 mol dm-3Ā NaCI conducts electricity better than 0.10 mol dm-3Ā CH3COOH because the solution of NaCI
60 / 80
One mole of a compound M(HCO3)2Ā has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
61 / 80
A finely divided from of a metal burns more readily in air than the rod from because the rod has
62 / 80
Which of the following occurs when a solution of CuSO4Ā is electrolysed using copper electrodes?
63 / 80
When alkanols react with sodium, the ga evolved is
64 / 80
Which of the following movements can be described as random motion?
65 / 80
Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
66 / 80
What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2Ā + O2Ā ā 2SO3; āH = - xKJmol-1
67 / 80
The property of calcium chloride which makes it useful as a drying agent is that it is
68 / 80
Consider the reaction represented by the following equation: H2(g)Ā + 12(g)Ā ā 2HI(g). The number of effective collisions of molecules of the reactants decreases as
69 / 80
Metals are said to be malleable because they
70 / 80
What is the shape of a molecule of CCI4?
71 / 80
Petrol consists mainly of
72 / 80
Which of the following compounds dissolves in water to form a solution with pH below 7?
73 / 80
30cm3Ā pf hydrogen at s.t.p combine with 20cm3Ā of oxygen to form steam according to the following equation 2H2(g)Ā + O2(g)Ā ā 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction
74 / 80
Calcium atom ionizes by
75 / 80
Which of the following contains co-ordinate covalent bond?
76 / 80
How many electrons are removed from Cr2-Ā when it is oxidized to CrO42-?
77 / 80
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
78 / 80
Which of the following pairs of reagents recat to produce hydrogen?
79 / 80
Which of the following increases as boiling water changes to steam?
80 / 80
Dehydration of ethanol produces
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