31) pH value of neutral solution is—
a) 8
b) 5
c) 7
d) 13
32) Acid reach with bases to give—
a) ester
b) Alcohol
c) Salt
d) None
33) If the vapour denisty of a gas is molecular mass will be—
a) 12
b) 16
c) 18
d) 28
34)The biocatalysts are—
a) Enzymes
b) Minerals
c) Plants
d) All proteins
35)Which fuel has the maximum calorific value—
a) Charcoal
b) Kerosene
c) Wood
d) Cow-dung
36)Which law of thermodynamics introduces the concept of entropy—
a) First law
b) Zeroth law
c) Third law
d) Second law
37)Which among the following has the highest ionization potential—
a) Li
b) B
c) Ne
d) F
38) The element that has the highest first ionization potential is—
a) Boron
b) Nitrogen
c) Oxygen
d) Carbon
39)The most powerful reducing agent is—
a) K
b) Ba
c) Na
d) Mg
40)Reverse of swelling of gel is known as—
a) Syneresis
b) Thixotropy
c) Sorption
d) None of these
41)Which of the following is mixture ?
a) Distilled water
b) Gasoline
c) Liquified petroleum gas
d) Both (b) , (c)
42) Diamond is _
a) An element
b) A compound
c) A mixture
d) A liquid
43) The product of equivalent weight and valency of an element is equal to _
a) Vapour density
b) Specific heat
c) Atomic weight
d) Molecular weight
44) The most abundant metal in earth crust is _
a) Iron
b) Magnesium
c) Calcium
d) Aluminium
45) The isotopes of chlorine with mass number 35 and 37 exist in the ratio of _
a) 1 :2
b) 2 :3
c) 3 : 1
d) 3 :4