General Chemistry

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46 Lead pencil contains

A
lead
B
ferrous sulphide
C
lead sulphide
D
graphite

47 The ratio of pure gold in 18 carat gold is :

A
100%
B
80%
C
75%
D
60%

48 Which of the following is used to remove ink and rust stains on cloth?

A
Oxalic acid
B
Alcohol
C
Ether
D
Kerosene oil

49 Which type of radiations are absorbed by the upper layer of the atmosphere?

A
Radio-waves
B
(2)Infrared
C
Visible
D
Ultraviolet

50 Which one of the following minerals is found in pure form?

A
Iron
B
Copper
C
Bauxite
D
Manganese

51 Commercial Vaseline is derived from

A
plant gums
B
coal tar
C
wool wax
D
petroleum

52 Which of the following is used for refrigeration?

A
Sulphur dioxide
B
Chlorine
C
Freon
D
Phosphine

53 Extensively used nitrogenous fertilizer is :

A
Ammonium nitrate
B
Urea
C
Ammonium sulphate
D
Nitro-lime

54 ‘Vinegar’ is a commercial name of :

A
Oxalic acid
B
Hydrochloric acid
C
Acetic acid
D
Citric acid

55 The first metal used by a man was :

A
Copper
B
Silver
C
Bronze
D
Brass

56 Smoke is formed due to :

A
solid dispersed in gas
B
solid dispresed in liquid
C
gas dispresed in solid
D
gas dispersed in gas

57 Sour milk contains

A
acetic acid
B
tartaric acid
C
citric acid
D
lactic acid

58 What material is used to make electric heater coil ?

A
Copper
B
Iron
C
Silver
D
Nichrome

59 Among the following iron ores, the highest percentage of iron content is found in:

A
Haemetite
B
Magnetite
C
Limnonite
D
None of these

60 Iodized salt is beneficial for

A
lowering of blood pressure
B
prevention of dehydration
C
thyroid function
D
salivary glands

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