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0% SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS) CHEMISTRY PAST QUESTIONS APPQuestions will be picked at random from the question bank.Download School Portal NG Official Android AppYou can use the NEXT button to move to the next question, use the PREV 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 QUESTIONSThe atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive? S T R Q 2 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1 Increases the collision rate of reactant particles Reduces the time for attainment of equilibrium Decreases the value of ∆H Shifts equilibrium position to the right 3 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l) Acid Oxidising agent Dehydrating agent Bleaching agent 4 / 80 Category: CHEMISTRY PAST QUESTIONSMetals are said to be malleable because they can be beaten into sheets are good conductors heat can be alloyed are good conductors of electricity 5 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following methods is suitable for the preparation of an insoluble salt? Neutralisation Action of an acid on a trioxocarbonate (IV) Double decomposition Action of an acid on a metal 6 / 80 Category: CHEMISTRY PAST QUESTIONSPauli Exclusion Principle is related to reversiblility of equlibrium reactions collision theory of reaction rates electronegativity values of elements quantum numbers of electrons 7 / 80 Category: CHEMISTRY PAST QUESTIONSThe property of calcium chloride which makes it useful as a drying agent is that it is deliquescent a strong electrolyte ionic a normal salt 8 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following substances decomposes when an electric current is passed through it? Tetrachlormethane Hydrochloric acid Zinc rod Glucose solution 9 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution? Copper (ll) oxide Copper turnings Copper (ll) trioxocarbonate (IV) Copper alloy 10 / 80 Category: CHEMISTRY PAST QUESTIONSWhat does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1 Dissociation energy Electron affinity Heat of atomization lonization energy 11 / 80 Category: CHEMISTRY PAST QUESTIONSIf the solubility of KHCO3 is 0.40 mole dm-3 40.0g 10.0g 100.0g 4.0g 12 / 80 Category: CHEMISTRY PAST QUESTIONSElactrostatic force of attraction between sodium ion and halide ion is greatest in NaCI NaI NaBr NaF 13 / 80 Category: CHEMISTRY PAST QUESTIONSExhaust fumes discharged from a smoky vehicle gradually become invisible as a result of combustion diffusion absorption emission 14 / 80 Category: CHEMISTRY PAST QUESTIONSA 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 and beta particles alpha particles only beta particles and gamma rays alpha particles and gamma rays 15 / 80 Category: CHEMISTRY PAST QUESTIONSConsider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that the reaction is endothermic and occurs at high temperature activation energy is high and a catalyst is required a solid is formed and heat is evolved direct combination is involved and the reaction is endothermic 16 / 80 Category: CHEMISTRY PAST QUESTIONSThe crystal layers in graphite are held together by van der Waals' forces hydrogen bonds electrostatic forces covalent bonds 17 / 80 Category: CHEMISTRY PAST QUESTIONSA 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 18 / 80 Category: CHEMISTRY PAST QUESTIONS0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI contains more ions has a lower molar mass has a higher pH is neutral to litmus 19 / 80 Category: CHEMISTRY PAST QUESTIONSA reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct? The reaction goes to completion at equilibrium Pressure has no effect on the equilibrium mixture The forward reaction is exthermic At equilibrium increase in temperature favours the reverse reaction 20 / 80 Category: CHEMISTRY PAST QUESTIONSWhat 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) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p] 5.82dm 3 0.040dm 3 0.896dm 3 8.62dm 3 21 / 80 Category: CHEMISTRY PAST QUESTIONSSubstances which absorb water from the atmosphere without dissolving in it are said to be anhydrous hydrated hygroscopic insolube 22 / 80 Category: CHEMISTRY PAST QUESTIONSWhich 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, lll, and IV l only l, ll and lll only l and ll only 23 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is the shape of a molecule of CCI4? Linear Trigonal planar Tetrahedral Pyramidal 24 / 80 Category: CHEMISTRY PAST QUESTIONSWhat will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g) the reaction will go to completion the forward reaction will be favoured the concentration of ammonia will increase Activation energy will decrease 25 / 80 Category: CHEMISTRY PAST QUESTIONSConsider the reaction represented by the following equation: H2(g) + 12(g) → 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 26 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following features of a human skeleton can be determined by carbon-dating? Mass Age Race Height 27 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following occurs when a solution of CuSO4 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 28 / 80 Category: CHEMISTRY PAST QUESTIONSIn the Periodic Table, the elements that loss electrons most readily belong to Group 1 A Group 111 A Group 11 A Group V11 A 29 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is responsible for metallic bonding? transfer of electrons from one atom to another Sharing of electrons between the metal atoms Attraction between the atomic unclei and cloud of electrons Attraction between positive and negative ions 30 / 80 Category: CHEMISTRY PAST QUESTIONSOne mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] 101 53 122 40 31 / 80 Category: CHEMISTRY PAST QUESTIONSElectrovalent compounds are characterized by strong oxidizing ability solubility in ethanol high melting point high molar mass 32 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following will displace copper from a solution of copper (ll) salt? Silver Aluminium ions Zinc ions Magnesium 33 / 80 Category: CHEMISTRY PAST QUESTIONSThe gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is carbon (IV) oxide sulphur (VI) oxide oxygen hydrogen 34 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following properties increases down a group in the Periodic Table? Ionization energy Atomic radius Electronegativity Electon affinity 35 / 80 Category: CHEMISTRY PAST QUESTIONSThe presence of unpaired electrons in an atom of a transition metal gives rise to shiny appearance nalleability ductility paramagnetism 36 / 80 Category: CHEMISTRY PAST QUESTIONSElements which belong to the same group in the Periodic Table are characterized by difference of +1 in the oxidation numbers of successive members presence of the same number of electron shells in the respective atoms presence of the same number of outermost electrons in the respective atoms difference of 14 atomic mass units between successive members 37 / 80 Category: CHEMISTRY PAST QUESTIONSTwo radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore Q is twice as stable as S Q emits fewer particles than S S decays faster than Q S is more stable than Q 38 / 80 Category: CHEMISTRY PAST QUESTIONSAluminium is extracted from cryolite bauxite magnetite cassiterite 39 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the orbitals 4s, 4p, 4d and 4f has the lowest energy? 4d 4f 4s 4p 40 / 80 Category: CHEMISTRY PAST QUESTIONSChlorine atom forms CI by Gaining one electron Sharing one electron Donating lone pair of electrons Losing one electron 41 / 80 Category: CHEMISTRY PAST QUESTIONS30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction 25cm cube 35cm cube 50cm cube 30cm cube 42 / 80 Category: CHEMISTRY PAST QUESTIONSPipe-borne water is usually chlorinated in order to improve the teste of the water kill harmful bacteria in the water coagulate sediments in the water remove the hardness in the water clear 43 / 80 Category: CHEMISTRY PAST QUESTIONSGiven that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible? Q + S+ → S + Q+ S + Q+ → Q + S+ R + P+ → P + R+ S + P+ → P + S + 44 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following movements can be described as random motion? wheelbarrow being pushed planets going round the sun gas molecules colliding in a flask car travelling on a straight line 45 / 80 Category: CHEMISTRY PAST QUESTIONSRusting of iron is an example of decomposition redox reaction displacement reaction deliquescence 46 / 80 Category: CHEMISTRY PAST QUESTIONSPetrol consists mainly of alkanoates polymers alktanols hydrocarbons 47 / 80 Category: CHEMISTRY PAST QUESTIONSP Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of Dalton's law Boyle's law Gay-Lussac's Law Graham's law 48 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following procedures is suitable for identifying the food colouring added to a pastry sample? The anode increases in mass The cathode becomes coated with copper Both electrodes gain electrons The blue colour of the solution fades gradually 49 / 80 Category: CHEMISTRY PAST QUESTIONSGas molecules are said to be perfectly elastic because they move about in straight lines the volume occupied by them is negligible they collide without loss of energy the distances between them are negligible 50 / 80 Category: CHEMISTRY PAST QUESTIONSIt can be concluded that gastric juice is acidic contains enzymes is a mixture has pH value of 7 51 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following contains co-ordinate covalent bond? NH4 Na+CI HCI CH4 52 / 80 Category: CHEMISTRY PAST QUESTIONSThe type of chemical bond that exists between potassium and oxygen in potassium oxide is covalent ionic metallic dative 53 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is the oxidation number of nitrogen in AI(NO3)3? + 3 + 6 + 5 + 1 54 / 80 Category: CHEMISTRY PAST QUESTIONSWhat 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] 0.635g 6.35g 18g 0.318g 55 / 80 Category: CHEMISTRY PAST QUESTIONSAn exothermic reaction is one which involves evolution of gas as it proceeds attainment of dynamic equilibrium loss of heat to the surrounding positive change in value of enthalpy 56 / 80 Category: CHEMISTRY PAST QUESTIONSChemical equilibrium is attained when concentrations of the reactants and products remain constant reactants in the system are used up reactants stop forming the products concentrations of the products are greater than those of the reactants 57 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following lowers the activation energy of a chemical reaction? Water Reducing agent Catalyst Freezing mixture 58 / 80 Category: CHEMISTRY PAST QUESTIONSA radioactive solid is best stored under ultraviolet light in a box lined with lead under paraffin oil in a cool, dark cupboard 59 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O 12 1 6 8 60 / 80 Category: CHEMISTRY PAST QUESTIONSA concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods? OH- CI- Cu2+ H+ 61 / 80 Category: CHEMISTRY PAST QUESTIONSEqual volumes of CO2 cnd CO at s.t.p have the same rate of diffusion number of molecules mass density 62 / 80 Category: CHEMISTRY PAST QUESTIONSIf an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly covalent ionic dative metallic 63 / 80 Category: CHEMISTRY PAST QUESTIONSWhich 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) 64 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following compounds dissolves in water to give an alkaline solution? Ammonium chloride Sodium chloride Sulphur (IV) oxide Potassium oxide 65 / 80 Category: CHEMISTRY PAST QUESTIONSThe liquid product of the destructive distillation of coal is kerosene ammoniacal liquor paraffin oil ethanol 66 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following non-metals reacts most readily with metals? Chlorine Carbon Sulphur Nitrogen 67 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following can undergo both addition reactions and substitution reactions? Benzene Pentane Hexane Propene 68 / 80 Category: CHEMISTRY PAST QUESTIONSCalcium atom ionizes by gaining two protons losing two electrons gaining two electrons sharing two electrons 69 / 80 Category: CHEMISTRY PAST QUESTIONSWhat is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O Copper Oxygen Nitrogen Hydrogen 70 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following increases as boiling water changes to steam? degree of disorder in the system activation energy temperature of the system number of molecules 71 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following pairs of reagents recat to produce hydrogen? Water and calcium dicarbide Copper and dilute hydrochloric acid Zinc and concentrated trioxonitrate (V) acid Magnesium and dilute tetraoxosulphate (VI) acid 72 / 80 Category: CHEMISTRY PAST QUESTIONSA mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by evaporation sublimation distillation filtration 73 / 80 Category: CHEMISTRY PAST QUESTIONSWhen alkanols react with sodium, the ga evolved is oxygen methane hydrogen ethyne 74 / 80 Category: CHEMISTRY PAST QUESTIONSWhat type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3? Redox reaction Dehydration Nutralization Destructive distillation 75 / 80 Category: CHEMISTRY PAST QUESTIONSHelium is preferred to hydrogen in filling balloons because hydrogen is inflammable is a component of water exhibits isotopy is diatomic 76 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following compounds dissolves in water to form a solution with pH below 7? Potassium hydroxide Ammonium chloride Sodium trioxocarbonate (IV) Sodium tetraoxosulphate (VI) 77 / 80 Category: CHEMISTRY PAST QUESTIONSWhich of the following is not correct about oxidation number convention? The oxidation number of a/an monatomic ion is equal to its charge alkali meta like sodium in its compounds is + 1 element in the free state is zero atom of a diatomic molecules is + 2 78 / 80 Category: CHEMISTRY PAST QUESTIONSThe spontaneity of a chemical reaction is determined by the change in the temperature of the system pressure applied to the system concentration of the reactants free energy of the system 79 / 80 Category: CHEMISTRY PAST QUESTIONSDehydration of ethanol produces propan-1,2,3-triol ethene ethanal ethanoic acid 80 / 80 Category: CHEMISTRY PAST QUESTIONSHow many electrons are removed from Cr2- when it is oxidized to CrO42-? 0 2 4 8 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 PREV 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
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
2 / 80
What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1
3 / 80
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l)
4 / 80
Metals are said to be malleable because they
5 / 80
Which of the following methods is suitable for the preparation of an insoluble salt?
6 / 80
Pauli Exclusion Principle is related to
7 / 80
The property of calcium chloride which makes it useful as a drying agent is that it is
8 / 80
Which of the following substances decomposes when an electric current is passed through it?
9 / 80
Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?
10 / 80
What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1
11 / 80
If the solubility of KHCO3 is 0.40 mole dm-3
12 / 80
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
13 / 80
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
14 / 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
15 / 80
Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that
16 / 80
The crystal layers in graphite are held together by
17 / 80
A finely divided from of a metal burns more readily in air than the rod from because the rod has
18 / 80
0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI
19 / 80
A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?
20 / 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) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]
21 / 80
Substances which absorb water from the atmosphere without dissolving in it are said to be
22 / 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
23 / 80
What is the shape of a molecule of CCI4?
24 / 80
What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)
25 / 80
Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
26 / 80
Which of the following features of a human skeleton can be determined by carbon-dating?
27 / 80
Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes?
28 / 80
In the Periodic Table, the elements that loss electrons most readily belong to
29 / 80
What is responsible for metallic bonding?
30 / 80
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
31 / 80
Electrovalent compounds are characterized by
32 / 80
Which of the following will displace copper from a solution of copper (ll) salt?
33 / 80
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
34 / 80
Which of the following properties increases down a group in the Periodic Table?
35 / 80
The presence of unpaired electrons in an atom of a transition metal gives rise to
36 / 80
Elements which belong to the same group in the Periodic Table are characterized by
37 / 80
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
38 / 80
Aluminium is extracted from
39 / 80
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
40 / 80
Chlorine atom forms CI by
41 / 80
30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction
42 / 80
Pipe-borne water is usually chlorinated in order to
43 / 80
Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
44 / 80
Which of the following movements can be described as random motion?
45 / 80
Rusting of iron is an example of
46 / 80
Petrol consists mainly of
47 / 80
P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of
48 / 80
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?
49 / 80
Gas molecules are said to be perfectly elastic because
50 / 80
It can be concluded that gastric juice
51 / 80
Which of the following contains co-ordinate covalent bond?
52 / 80
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
53 / 80
What is the oxidation number of nitrogen in AI(NO3)3?
54 / 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]
55 / 80
An exothermic reaction is one which involves
56 / 80
Chemical equilibrium is attained when
57 / 80
Which of the following lowers the activation energy of a chemical reaction?
58 / 80
A radioactive solid is best stored
59 / 80
What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O
60 / 80
A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
61 / 80
Equal volumes of CO2 cnd CO at s.t.p have the same
62 / 80
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly
63 / 80
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
64 / 80
Which of the following compounds dissolves in water to give an alkaline solution?
65 / 80
The liquid product of the destructive distillation of coal is
66 / 80
Which of the following non-metals reacts most readily with metals?
67 / 80
Which of the following can undergo both addition reactions and substitution reactions?
68 / 80
Calcium atom ionizes by
69 / 80
What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
70 / 80
Which of the following increases as boiling water changes to steam?
71 / 80
Which of the following pairs of reagents recat to produce hydrogen?
72 / 80
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
73 / 80
When alkanols react with sodium, the ga evolved is
74 / 80
What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?
75 / 80
Helium is preferred to hydrogen in filling balloons because hydrogen
76 / 80
Which of the following compounds dissolves in water to form a solution with pH below 7?
77 / 80
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
78 / 80
The spontaneity of a chemical reaction is determined by the change in the
79 / 80
Dehydration of ethanol produces
80 / 80
How many electrons are removed from Cr2- when it is oxidized to CrO42-?
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