StudentAidUnit 6: Equilibria — Mcqs
9th Class Chemistry · Unit 6: Equilibria
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1.What will happen if the rates of forward and reverse reactions are very high?
2.Predict which components of the atmosphere react in the presence of lightening.
3.An inorganic chemist places one mole of PCl5 in a container A and one mole of each Cl2 and PCl3 in container B. Both the containers were sealed and heated to the same temperature to reach the state of equilibrium. Guess about the composition of mixtures in both the containers.
4.CaO or lime is used extensively in steel, glass and paper industries. It is produced in an exothermic reversible reaction by the decomposition of lime (CaCO3). Choose the conditions to produce maximum amount of lime.
5.What condition should be met for the reversible reaction to achieve the state of equilibrium?
6.Why the gas starts coming out when you open a can of fizzy drink?
7.The following reaction is performed in an open vessel.
CaCO3(s) ⇌ CaO(s) + CO2(g)
How the equilibrium will be affected if you increase the pressure?
- a The forward reaction will be favoured
- b The backward reaction will be favoured
- c No effect on backward reaction
- d No effect on forward or backward reaction
8.When a reaction will become a reversible one?
9.Is reversible reaction useful for preparing compounds on large scale?
10.What will happen to the concentrations of the products if a reversible reaction at equilibrium is not disturbed?
11.In an irreversible reaction equilibrium is:
12.The characteristics of reversible reactions are the following except:
13.A reverse reaction is one that:
14.The reactions in which the products do not recombine to form reactants are called:
15.The reactions in which the products can recombine to form reactants are called:
16.Which type of reactions speed up gradually?
17.Such reactions which continue in both directions are called:
18.In a chemical reaction, the substances that combine are called:
19.The forward reaction takes place from:
20.Equilibrium state is achievable in:
21.A complete reaction is in which:
22.In the beginning the rate of reverse reaction is:
23.The new substance formed in a chemical reaction is:
24.The colour of anhydrous copper (II) sulphate solid is:
25.The colour of hydrated copper (II) sulphate solid is:
26.The colour of anhydrous cobalt (II) chloride solid is:
27.The colour of hydrated cobalt (II) chloride solid is:
28.Which of the following does not happen, when a system is at equilibrium state?
29.Which is true about the equilibrium state?
30.When a system is at equilibrium state:
31.When the rate of the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixture remains constant, it is called:
32.Which type of reactions do not go to completion?
33.For the following reaction, equilibrium mixture will contain:
N2O4(g) ⇌ 2NO2(g) Kc = 0.211
34.Nitrogen and hydrogen were reacted together to make ammonia:
N2 + 3H2 ⇌ 2NH3 Kc = 2.86mol^-2dm^6
What will be present in the equilibrium mixture?
35.Concentration of reactants and products at equilibrium remains unchanged if:
36.At what temperature, rate of ammonia formation & decomposition is the highest:
- a 300 °C
- b 400 °C
- c 500 °C
- d 600 °C
37.Industrially, ammonia is produced by which process?
38.Formation of ammonia from Nitrogen and hydrogen is an:
- a Exothermic Reaction
- b Endothermic Reaction
- c Both A & B
- d No heat change
39.How much heat absorbed when NH3 decomposed into N2 and H2?
40.Which compound is used a thinner in paint industry?