11)Red litmus paper is changed into blue in solution of—
a) Base
b) Acid
c) Salt
d) None
12)Which of the following gases will have the highest rate of diffusion—
a) O2
b) CO2
c) NH3
d) N2
13)The density of the gas is equal to—
a) np
b) MP/RT
C) P/RT
d) M/V
14)Which of the following catalyst is sensitive to tempreture changes—
a) Fe
b) Pt
c) Ni
d) Enzyme
15) Which has maximum calorific value—
a) Fat
b) Protein
c) Carbohydrate
d) Amino acid
16)The ratio of y for inert gases is—
a) 1.33
b) 1.66
c) 2.13
d) 99
17) Which of the following among alkali metals is most reactive?
a) Na
b) K
c) Rb
d) Cs
18)The law of relative lowering of vapour pressure was given by—
a) Vant Hoff
b) Ostwald
c) Lewis
d) Raoult
19)Which of the following metals is not attacked by the environment—
a) Gold
b) Copper
c) Silver
d) Iron
20) Out of the following which one is an example of emulsion —
a) Soap solution
b) Milk
c) Blood
d) Air