1. For a particular gaseous reaction A → products a graph was plotted as shown below. It shows that the reaction of A is
Ans: Zero order w.r.t. A
HINT: In zero order reaction, cone of reactants decreases uniformly with time.
2. A first order reaction is 50% complete in 100 minutes. The time required for 100% completion would be
Ans: Infinity
HINT: ‘No’ reaction is completed
3. For a reaction Ea = 0 and k = 3.2 × 104 s-1 at 300 k. The value of 'k' at 310 k would be
Ans: 3.2 × 104 s-1
HINT: 
4. A gaseous reaction, 2A(g) + B(g) → 2C(g) shows a decrease in pressure from 120 mm to 100 mm in 10 minutes. The rate of appearance of C is
Ans: 2mm/ min
HINT: Rate of appearance f 
5. For a particular reaction it is observed that its t0.5 becomes one- half when the initial concentration is halved. The order of reaction w.r.t. the reactant is
Ans: 0
HINT: For zero order reaction t1/2 α a1 (Initial cone)
6. Lyophobic isols of the following
A) Smoke B) Milk
C) Starch solution D) Gold sol
Ans: A, D
HINT: Lyophobic sols have less affinity between D.P. & D.M.
7. Gold numbers of four protective colloids A, B, C and D are 0.005, 0.01, 0.1 and 0.5 respectively. The decreasing order of their protective power is
Ans: ABCD
HINT: Gold number 
8. In a binary mixture, the particle size is 10-9 cm. Then it is a
Ans: True solution
HINT: If particle size is less than 1mμ in true solutions
9. Assertion (A): Soap solution behaves as colloidal solution at concentrations higher than a critical concentrate
Reason (R): Soap function as an emulsifying agent for the water-dirt emulsion.
Ans: Both A and R are true and R is not correct explanation of A
HINT: The Minimum cone. above which a true solution behaves as colloid is ‘CMC’.
10. Critical temperatures of 4 gases A, B, C and D are 430k, 356k, 400k and 441k respectively. The extent of adsorption is more for which gas on one gram of activated charcoal?
Ans: D
HINT: The value of critical temperature α extent of adsorption
11. The rate constant for a first order reaction is 1 × 10-2 s-1. The concentration of the reactants would be reduced from 1 mole to 0.25 mole is
Ans: 138.6 sec
HINT: 
12. A graph of ln k vs. 1/T has a slope equal to
Ans: 
HINT: lnk
13. The reaction 2 NO + Br2→ 2 NOBr follows the Mechanism given below
I. NO + Br2 ⇆ NOBr2 .... Fast
II. NOBr2 +NO → 2NOBr.... Slow
In concentrations of both NO and Br2 are increased two times, the rate of reaction would become
Ans: 8 times
HINT: 
14. For a process A + B → Products, the rate is first order with respect to A and first order with respect to B. When 1.0 Mole each of A and B are taken in a one litre vessel, the initial rate is
1 × 10-2 Mol L-1 s-1. The rate of the reaction when 90% of the reactants have been converted into products would be
Ans: 1×10-4 Mol L-4 s-1
HINT: r = K[A]1 [B]1, 10-2 K[1]1 [1]1
K= 10-2
then r = 10-2 [0,1]1 [0,1]1
15. The crack constant does not depend on-
Ans: Concentration
HINT: Rate constant is not effected by concentration
16. Deemulsification is involved in-
Ans: The conversion of cream into butter by churning
HINT: During deemulsification large molecules are broken into small molecules.
