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CHAPTER NO 9
CHEMICAL EQUILIBRIUM
Encircle the most appropriate answer among the following options
1 In chemical reactions the substances that combine are known as :
(a) Products
(b) Reversible reaction
(c) Reactants
(d) Irreversible reaction
2 Name the reactants in this equation. 2H2(q)+O2(g) pt/heat 2H2O(l)
(a) H2O
(b) H2 and O2
(c) O2
(d) None of these
3 The response in which the products do not recombine to from reactants is known as:
(a) Reversible reactions
(b) Reactants
(c) Products
(d) Irreversible reactions
4 A reactions in which the products recombine to form reactants are known as:
(a) Reactants
(b) Reversible reactions
(c) Irreversible reaction
(d) Both and b
‘
5 Irreversible reaction goes on:
(a) Never complete
(b) Both a and c
(c) completion
(d) None of these
6 Reversible reaction:
(a) can complete
(b) never complete
(c) Both a and b
(d) None of these
7 The colour of hydrogen Iodide (HI) is:
(a) Blue.
(b) Grey
(C) Purple
(d) Colourless
8 The colour of iodine (I) is:
(a) Purple
(b) Green
(c) Yellow
(d) None of these
9 At equilibrium the rate of forward and reverse reaction will be .
(a) Greater
(b) Normal
(c) Equal
(d) Lesser
10 Dynamic means reaction i:
(a) Stops
(b) Still continuing
(c) Opposite direction
(d) Both a and b:
11 When reaction ceases to proceed it is called:
(a) Dynamic equilibrium
(b) Static equilibrium
(c) chemical equilibrium
(d) none of these
12 Reaction in which reactants react to form products are known as :
(a) forward reactions
(b) reverse reactions
(c) reversible reaction
(d) backward reactions
13 At the early stage the rate of forward reaction is.
(a) low
(b) very low
(c) very fast
(d) all of these
14 There are possibilities at equilibrium state.
(a) three
(b) five;
(C) four
(d) two
15 Reverse reaction take place from:
(a) left to right
(b) right to left
(C) both a and b
(d) none of these
16 Reverse reactions – gradually.
(a) speeds up
(b) negligible
(c) slows down
(d) none of above
17 Forward reaction takes place from:
(a) left to right:
(b) right to left
(c) both a and b,
(d) all of these
18 The properties of reversible reaction are the following except.
(a) products never recombine to from reactant
(b) they never complete
(c) they proceed in both ways
(d) they have double arrow between them
19 In the lime kiln the reaction CaCO3(s)➝CaOs +CO2 goes to completion because, of
(a) High temperature
(b) CO2 escapes continuously
(c) CaO is not dissociated i
(d) CaO is more stable then CaCO3
20 For the reaction 2Ag +Bg = 3Cg the expression for the equilibrium constant is
(a) [2A][B]/3C
(b) [A]2[B] /[C]3
(c) [3C]/[2A][B]
(d) [C]3/[A]2 [B]
21 Which statement among the following is false related to active mass?
(a) Rate of response is directly proportional to active mass.
(b) The opposing reactions (forward and reverse) stop.
(c) Active mass means total mass of substances
(d) None of these
22 When the magnitude of Ke is very large it indicates.
(a) Reaction mixture consists of almost all products
(b) Reaction mixture has almost all reactants.
(c) Reaction has gone to completion.
(d) All of these
23 When the magnitude of Kc is very small it shows.
(a) equilibrium is never establish
(b) all reactants will be converted to products
(c) reaction will go to complete
(d) the amounts of products is negligible
24 Reactions will have comparable amounts of reactants and products at equilibrium state.
(a) very small Kc value
(b) moderate Kc value
(c) very large Kc value
(d) none of these
25 In an irreversible reaction dynamic equilibrium.
(a) never establishes
(b) establish readily
(c) establish after the completion of reaction.
(d) establish before the completion of reaction.
26 For a reaction between PCl3 and Cl, to form PCl; the units of Kc are:
(a) mol dm-3
(b) mol-1 dm-3
(c) mol-3 dm3
(d) mol dm3
27 An equilibrium is achievable only in
(a) open system
(b) close system.
(c) both a and b
(d) all of these
28 At equilibrium state the physical characteristics like density, colour etc:
(a) remains same
(b) changes .
(c) all of these
(d) none of these
29. Which among the following scientists presented the law of mass action.
(a) Guldberg
(b) Bronsted
(c) Lowry
(d) Lewis
30 Reversible reactions takes place in:
(a) single direction
(b) both directions
(c) both a & b
(d) all of these
31 Numerical value of Kc predicts :
(a) direction of reaction
(b) extent of reaction
(c) both a & b.
(d) None of these
32 When H, and O2 combine they form
(a) H2O
(b) H and O.
(c) HO2
(d) none
33 When Hand I Combine they form
(a) H20
(b) HI
(c) I2
(d) H2 and I2
34 The ratio of product concentration of products raised to power of co-efficient to the products of reactant raised to the power co-efficient is called .
(a) Kc
(b) QC
(c) forward reaction
(d) reverse reaction
35 In course of a reaction, reaction proceeds forward then:
(a) Qc < Kc
(b) Qc > Kc
(c) Qc = Kc
(d) None of them
36 In course of a reaction, reaction proceeds reverse then:
(a) Qc <Kc
(b) Qc > Kc
(c) Qc = Kc
(d) all of these
\
37 In course of a reaction, reaction is at equilibrium then:
(a) Qc <Kc
(b) Qc > Kc
(c) Qc = Kc
(d) Both a & b.
38 In course of reaction, the reaction goes to completion have:
(a) very large Kc value
(b) very small Kc value
(c) moderate Kc value
(d) None of them
39 In extent of reaction, the reaction never is going to completion have:
(a) very large Kc value
(b) very small Kc value
(c) moderate Kc value
(d) Qc = Kc.
40 Reaction quotient is expressed as:
(a) Kc
(b) Qc
(c) Kr
(d) Kf
41 There are possibilities of predicting extent of reaction ,
(a) 1
(b) 2
(c) 3
(d) 4
42 There are major components of atmosphere:
(a) 1
(b) 2
(c) 3
(d) 4
43 The two major components of atmosphere are:
(a) nitrogen and hydrogen gasses –
(b) oxygen and hydrogen gasses
(c) nitrogen and carbon dioxide gasses
(d) nitrogen and oxygen gasses
44 Nitrogen and oxygen constituents’ of the atmosphere:
(a) 99% .
(b) 98%
(c) 92%
(d) 97%
45 Gases are being used to manufacture: :
(a) products
(b) chemicals
(c) reactants
(d) Both b & c
46 Nitrogen is used to prepare:
(a) carbon dioxide
(b) ammonia
(c) hydrogen
(d) None of these
47 Oxygen is used to prepare:
(a) ammonia
(b) nitrogen gas
(c) oxygen
(d) sulphur dioxide
48 By knowing the value of equilibrium constant
can be predicted:
(a) direction of reaction
(b) extent of reaction
(c) both a & b
(d) all of these
49 The characteristics of reversible reaction are the following except
(a) they never complete
(b) products never recombines to form reactions
(c) they had a double arrow between reactants and products
(d) none of these
50 Many environmental systems depend for their:
(a) existence on their delicate equilibrium phenomenon
(b) existence on the water
(c) both of these
(d) none of these
51 Ammonia is used to manufacture :
(a) sulphuric acid
(b) hydrogen
(c) nitrogenous fertilizers
(d) none of these
52 Sulphur dioxide is used to manufacture:
(a) sulphuric dioxide
(b) ammonia
(c) sulphuric acid
(d) nitrogenous fertilizers
53 Which is the king of chemicals:
(a) sulphuric dioxide
(b) ammonia
(c) nitrogen
(d) sulphuric acid
54 Nitrogen and oxygen gasses are b used for manufacturing chemicals since the advent of century:
(a) 18
(b) 20
(C) 19
(d) 21
55 The response in which all the reactants had been turned into products are known as
(a) incomplete reactions
(b) complete reactions
(c) continuous reactions
(d) None of them
56 The lives of aquatic animals and plants are not directly associated with concentration of dissolved in water:
(a) carbon dioxide
(b) oxygen
(c) both a & b
(d) none of them
57 Irreversible reaction represented by a .. between a reactant and a product:
(a) single arrow
(b) Kc
(c) double arrow
(d) all of these
58 Irreversible reaction consists of:
(a) forward reactions
(b) reverse reactions
(c) forward & reverse reactions
(d) none of them
59 When CaO reacts with CO2 they produce:
(a) CaCO3
(b) CaCO2
(c) Both a & b.
(d) all of these
60 In the beginning reverse reactions is
(a) fast
(b) stops
(c) slow
(d) none of above
61 Rate of forward reactions takes place at the rate of reverse reaction, the composition of the reaction mixture remains constant is called
(a) static equilibrium
(b) dynamic equilibrium
(c) chemical equilibrium state
(d) none of these
62 Point out the coefficient among the following hypothetical reactions 2A+3 D ➝ 4C+8D
(a) 2,3,4d
(b)2,3,4,3
(c) A,b,c,d
(d) 2,3,4,8
63 An active mass is considered as the molar concentrations in units of
(a) mol dm-3
(b) mol-1 dm-3
(c) mol-3 dm3
(d) mol dm3
64 There are _characteristics of dynamic equilibrium
(a) one
(b) two
(c) three
(d) five
65 The oxidation of carbon monoxides is going to completion at
(a) 2000K
(b) 1000K
(C) 100K
(d) 200K
66 The reaction quotient is useful as it predicts the direction of reaction through comparing the value of
(a) Qc
(b) Qcwith Kc
(c) kc
(d) none of these
67 For the reactions H2 + I2 ➝2HI. The reactions quotients for this reactions is
(a) 8.0
(b) 2.0
(c) 9.0
(d) None of these
68 As the numeric value of Qc (8.0) is less than Kc (57.0) the reaction is not
(a) in forward direction
(b), at equilibrium
(c) in reverse direction
(d) all of these