General Chemistry

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256 Glass is a :

A
pure solid
B
supercooled liquid
C
gel
D
polymer

257 Which of the following produces highest amount of energy upon oxidation?

A
Protein
B
Fat
C
Glucose
D
An alkane

258 The atmospheric gas that is mainly responsible for Green House effect :

A
Ozone
B
Nitrogen
C
Oxygen
D
Carbondioxide

259 An example of semiconductor is :

A
German silver
B
Germanium
C
Phosphorous
D
Arsenic

260 The name of plastic polymer from which combs, toys, bowls etc., can be made, is :

A
Polyurethane
B
Polystyrene
C
Metallic polysulphides
D
Teflon

261 Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?

A
Nitrous oxide
B
Carbon dioxide
C
Chlorofluorocarbon
D
Sulphur dioxide

262 The advantage of detergents over soaps is :

A
Detergents are soluble in water
B
Detergents could not give much lather
C
Detergents give lather even with hard water
D
Soaps give lather with only soft water

263 Bleaching action of moist sulphur di-oxide is because of its

A
basic property
B
acidic property
C
oxidising property
D
reducing property

264 What is the element required for solar energy conversion ?

A
Beryllium
B
Tantalum
C
Silicon
D
Ultra pure carbon

265 A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be

A
silver
B
copper
C
aluminium
D
zinc

266 A substance which readily forms colloidal solution in contact with water is called

A
Extrinsic colloid
B
Associated colloid
C
Hydrophobic colloid
D
Hydrophilic colloid

267 Which of the following gases is most toxic ?

A
Carbon dioxide
B
Carbon monoxide
C
Sulphur dioxide
D
Chlorine

268 Petroleum is a mixture of :

A
elements
B
hydrocarbons
C
polymers
D
salts

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

A
Haemetite
B
Magnetite
C
Limnonite
D
None of these

270 Sour taste of ‘Coca Cola’ is due to the presence of :

A
acetic acid
B
phosphoric acid
C
hydrochloric acid
D
formic acid