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1) For the first-order reaction, the half-life is related to the expression k t_1/2 = 0.693. Half-life is the 1
A. Time is taken for the conc. of the product to increase to half of its original value.

2) Which one of the following factors does not affect the equilibrium position?

3) The solubility product of a salt AB is 0.25 mol²/dm⁶. What will be its solubility (mol/dm³)

4) One of the following is not a physical method for determination of the rate of reaction

5) 2HI_(g) ⇌ H_2(g) + I_2(g)
For the above reaction if Kc is 0.25, then Kp for
this reaction will be

6) A buffer is prepared by mixing the solutions of equimolar acetic acid and sodium acetate. The pH should be equal to

7) The rate of a reaction involving ions can be studied by the method

8) If the equilibrium constant KC value for a certain reaction is very small, then:

9) All are correct about zero order except

10) Which of the followings is a pseudo-first-order reaction?

11) 1.0g mole of ethyl alcohol and 1.0g mole of acetic acid are mixed. At equilibrium 0.666g mole of the ester is present. The value of the equilibrium constant is

12) The half-life of the reaction becomes half when initial concentrations of reactants are doubled. The order of the reaction will be

13) The pKa value of CH₃COOH is 4.74. The pH of an equimolar solution of acetic acid and sodium acetate is:

14) The rate of chemical reaction roughly doubles for every 10°C rise in temperature. If the temperature is raised by 20°C, the rate may increase

15) Following is an exothermic reaction
A+ B ⇌ C+ D. Which is the correct statement

16) The pH of buffer in which concentrations of salt and base are 0.1M and 0.01M respectively
(pKb = 4.0)

17) The rate of first-order reaction depends on

18) For the gas phase reaction
2X+Y ⇋ 2Z  ∆H= -ive kJ/mol. The yield of Z at equilibrium could be increased by

19) In N₂ +3H₂ ⇌ 2NH₃ the yield of the product will be minimum if

20) 2X+Y ⇌ Z At equilibrium 0.20 mole of X, 0.45 mole of Y and 0.15 mole of Z are present, Calculate Kc

21) In a reaction 2X + Y → M + N
If the concentration is of Y kept constant and that of X is tripled. The rate of reaction will

22) Catalyst can change

23) If the value of the Kc is large then it shows that the products are:

24) Rate of an exothermic reaction is increased by increasing all except

25) The difference in energy between reactants and the transition state is called