1. The most important ore
of Aluminium is
Bauxite
2. The
element present in the largest amount in rocks and minerals is
Silicon
3. An
alloy used in making heating elements for electric heating devices is
Nichrome
4.
German Silver is an alloy of
Zinc,
Copper and Nickel
5. Air
is a/an
Mixture
6.Which of the following
is the best conductor of Electricity ?
Sea
water
7.Balloons
are filled with
Helium
8. The
charcoal used to decolourise raw sugar is
Wood
charcoal
9.The
most abundant metal in the earth’s crust is
Aluminium
10. The
gas used to extinguish fire is
Carbon
dioxide
11. The element common to
all acids is
Hydrogen
12.Gobar
gas contains mainly
Methane
13. The
most malleable metal is
Pain
Killer
14.
Tetraethyl lead is used as
Petrol
additive
15.
Which of the following is used in beauty parlours for hair setting ?
Chlorine
16.From which mineral is
radium obtained
Pitchblende
17.What
is laughing gas ?
Nitrous
oxide
18.
Which form of phosphorus is used in safety metals?
Red
Phosphorus
19.
Stainless steel is an alloy of
Iron,
Chromium and Nickel
20.Antidiuretic
hormone (ADH)
causes
an increase in the blood pressure
21.The major ingredient
of leather is
Collagen
22.Glass
is made from the mixture of
Sand and
silicates
23.
Epoxy resins is used as
Adhesives
24.
Polythene is industrially prepared by the polymerization of
Ethylene
25.A
mixture of water and alcohol can be separated by
Distillation
26.A substance which
changes readily into vapour without heating is called
Volatile
27.In
which following processes light energy is converted into chemical energy ?
Photosynthesis
28.Cooking
oil can be converted into vegetables ghee by the process of
Hydrogenation
29.Photosynthesis
is
An
endothermic process
30.Which
of the following substances exhibit the property of sublimation ?
Camphor
31.Combustion is the
process in which
Heat and
Light is produced
32.The
chemical used as a fixer in photography is
Sodium
thiosulphate
33.A
mixture of iron filings and sand can be separated by
Magnetic
Separation
34.In
which of the following process, Vanadium Pentoxide is used as a catalyst ?
Contact
process
35.The
rate of chemical reaction does not depend on
Pressure
36.Which of the following
metals can displace hydrogen from dilute acids ?
Zinc
37.Reaction
of alcohol, with carboxylic acid is known as
Esterification
38.Saponification
involves the hydrolysis of fats and oils by
Caustic
acid
39.Which
of the following gases is obtained by the reaction of water with Calcium
Carbide ?
Methane
40.The
gas liberated during the reaction of copper with dilute nitric acid is
NO
41. Which of following
substances undergoes chemical change on heating ?
it can
dissociate into equal number of hydrogen ions
42.Which
of following substances undergoes chemical change on heating ?
Lead
Nitrate
43.Water
is neither acidic nor alkaline because
it can
dissociate into equal number of hydrogen ions
44.PVC
is obtained by the polymerisation of
Vinyl
Chloride
45.Which
of the following metals can displace zinc from a solution of zinc sulphate ?
Magnetism
46. Water gas is prepared
by passing
Steam
over white hot coke
47.Which
of the following is used in pencils?
Graphite
48.LPG
consists of mainly
methane,
butane and propane
49.Permanent
hardness of water can be removed by adding
washing
soda
50.Which
of the following is not an isotope of hydrogen?
Yttrium
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