General Chemistry

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61 The chemical name of “laughing gas’ is :

A
Nitric oxide
B
Nitrogen dioxide
C
Nitrogen pentoxide
D
Nitrous oxide

62 The fiber least prone to catch fire is :

A
nylon
B
polyester
C
cotton
D
terylene

63 Which of the following gases is mixed with oxygen for breathing by divers in aqualungs?

A
Methane
B
Nitrogen
C
Helium
D
Hydrogen

64 Which one of the following gases has the highest calorific value?

A
Natural gas
B
Water gas
C
Coal gas
D
Indane gas

65 Among the fuels given below, the one with highest calorific value is :

A
Coke
B
Coal
C
Wood
D
Natural gas

66 The common refrigerant in domestic refrigerator is :

A
Neon
B
Oxygen
C
Nitrogen
D
Freon

67 Which of the following is used to denature ethanol ?

A
Methyl alcohol
B
Propyl alcohol
C
Phenol
D
Methane

68 Chemically ‘Quick Silver is known as

A
Mercury
B
Silver
C
Gold
D
Copper

69 Which of these acids is not organic in origin?

A
Lactic acid
B
Sulphuric acid
C
Citric acid
D
Oxalic acid

70 Which of the following is a supercooled liquid ?

A
Ice Cream
B
Teflon
C
Glass
D
Mercury

71 Which of the following is used in dating archaeological findings ?

A
92235U
B
614C
C
13H
D
818O

72 ‘Plaster of Paris’ is made by partial dehydration of :

A
epsom salt
B
gypsum salt
C
blue vitriol
D
green vitriol

73 Who discovered the atom bomb?

A
Madam Curie
B
Pierre Curie
C
Otto Hahn
D
Albert Einstein

74 Which one of the following is radioactive ?

A
Cesium
B
Platinum
C
Strontium
D
Thorium

75 Type metal used in printing press is an alloy of :

A
lead and copper
B
lead and antimony
C
lead and bismuth
D
lead and zinc