41.
A mixture of sodium chloride and naphthalene can
be separated, by
a)
Extraction with hot water
b)
Extraction with cold water
c)
Sublimation
d)
Steam distillation.
42.
The Ph of the solution obtained by dissolving
pure sodium chloride in water is
a)
Acidic
b)
Basic
c)
Neutral
d)
Dependent on the amount of sodium chloride
dissolved in water.
43.
Oxygen on reaction with non-metals forms oxides,
which are
a)
Basic oxides
b)
Acidic oxides
c)
Amphoteric oxides
d)
Neutral oxides
44.
Biogas consists of mainly
a)
Methane
b)
Ethane
c)
Butane
d)
Carbon dioxide
45.
A gas is evolved when a piece of zinc metal is placed in dilute
sulphuric acid (H₂SO₄). What is the gas?
a)
Hydrogen
b)
Oxygen
c)
Water vapour
d)
Sulphur dioxide
46.
Turmeric (Hladi)rapidly becomes colorless on
addition of
a)
Baking soda
b)
Vinegar
c)
Lemon juice
d)
Alcohol
47.
Metalloids are
a)
Alloys of alkali metals with other metals
b)
Colloids of metals
c)
Elements having some properties of both metals
and non-metals
d)
Metals heavier than lead.
48.
Two reactants in a flask produce bubbles of gas;
it turns lime water into milky. The reactants in the flask are
a)
zinc and hydrochloric an
b)
Magnesium carbonate and hydrochloric acid
c)
Magnesium nitrate and hydrochloric acid
d)
Magnesium sulphate and hydrochloric acid
49.
Yeasts bring about fermentation by the action of
a complex enzyme known as
a)
Peroxidase
b)
Zymase
c)
Invertase
d)
Catalase
50.
The purity of 14 carat gold is
a)
14.6%
b)
30%
c)
58.4%
d)
75.5%
ANSWERS
41.C
42.C
43.B
44.A
45.A
46.C
47.C
48.B
49.B
50.C