Practice Test

1) The law of mass action was proposed by

2) Which of the following factors influence a chemical system in accordance with the Le-Chaterlier' principle?

3) Chemical reaction which proceeds only in one direction is called a/an

4) When a reversible reaction acquires the equilibrium state,

5) The rate at which a substance undergoes reaction is proportional to

6) Which one of the following satements is correct?

7) A reversible reaction is said to have attained equilibrium when

8) Small value of equilibrium constant show that

9) At a constant temperature, if a small amount of one of the products is removed, the equilibrium constant

10) The active mass of a solid in heterogeneous equilibrium is taken as

11) Le-Chatelier principle is applicable to

12) The equilibrium constant in a reversible chemical reaction at a given temperature

13) Which one of the following informations can be obtained on the basis of Le-Chatelier principle?

14) The active mass of 64g of HI in a two litre flask would be

15) The numerical value of equilibrium constant is affected by changing

16) The chemical equilibrium is the state of chemical reaction at which

17) Mathematical expression obtained by applying law of mass action to chemically reversible reaction is called

18) Molar concentration per unit volume is called

19) In an irreversible reaction

20) Chemical reaction in which reactants react to form products and the products formed react with each other directly to form the original reactants back is known as _______ reaction

21) A reaction in which heat is absorbed is called as an _______ reaction.

22) A homogeneous reaction is one which occurs only in________ phase

23) If the temperature is kept constant, the reaction which is accompanied by a decrease in volume will be favoured by increasing

24) At a given pressure an endothermic reaction is favoured by increasing

25) The ______ states that "In a homogeneous system at constant temperature the rate at which a substance reacts is proportional to its active mass and rate of a chemical reaction is proportional to the product of active masses of the reacting substances at that moment".

26) According to Bronsted-Lowry concept a base is a substance that

27) According to Lewis concept an acid is a substance which

28) NaCl is a salt of

29) pH of an acidic solution is

30) Buffer solution is the solution which has

31) The degree of dissociation of a weak electrolyte in aqueous solution

32) Solutions with reserved acidity or alkalinity are known as

33) The theory of ionization was put forward by

34) A conjugate acid differs from its conjugate base by

35) Precipitation takes place when the ionic product

36) A buffer solution is a solution whose pH value on keeping in the air

37) An aqueous solution of aluminium sulphate would show

38) The acidic buffer solution can be prepared by mixing solutions of

39) The concept that acid is proton donor and base is proton acceptor was given by

40) Calculate the percent ionisation of 0.05M acetic acid

41) The active mass is denoted by using the symbol

42) The pH of a solution of sodium acetate will be

43) Which of the following is an irreversible reaction?

44) If ammonia is added to pure water, the concentration of a chemical species already present will decrease. This species is

45) A example of a reversible reaction is

46) Which of the following statements is correct about equilibrium constant?

47) Le - Chatelier principle is not applicable to

48) In the reaction, when there is no change in volume

49) According to the Arrhenius concept base is a substance that

50) Which one of the following is the weakest base?

51) A mixture of a weak acid (say acetic acid) and its salts with a strong base (say sodium acetate) acts as a buffer solution. Which other pair of substances from the following may have similar properties?

52) Which of the following is a Lewis base?

53) Ionic product of water is

54) Hydrogen ion concentration of neutral solution is

55) Hydroxyl ion concentration of a neutral solution is

56) pH of solution is defined as

57) The hydroxyl ion concentration in a solution having pH 4 will be

58) The unit of solubility is

59) Which of the following substances on dissolving in water will give a basic solution?

60) For the salt of weak acid and strong base,the hydrolysis constant is given by the expression

61) A 0.2 molar solution of formic acid is 3.2% ionizes. Its ionization constant is

62) The pH of 1.0 M aqueous solution of a weak acid HA is 6.0.Its dissociation constant is

63) A 0.2 M solution of methanoic acid has degree of ionisation 0.032. Its dissociation constant would be

64) Which of the following pairs will form a buffer

65) Which one of the following is a stronger base?