Chemistry mcq For UPSC | SSC | Rail | RRB | State PSC | class 10 P20

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Page 20

90086191. Silver nitrate solution is kept in brown bottles in the laboratory because

A

it reacts with ordinary white bottles

B

brown bottles stops the passage of light through it

C

brown bottles do not react with it

D

brown bottles react with it

B

Correct Answer: B. brown bottles stops the passage of light through it

90077192. Petroleum consists of a mixture of

A

Carbohydrates

B

Carbonates

C

Hydrocarbons

D

Carbides

C

Correct Answer: C. Hydrocarbons

90012193. An example of semiconductor is

A

German silver

B

Germanium

C

Phosphorous

D

Arsenic

B

Correct Answer: B. Germanium

90056194. Hydrogen is not found in the atmosphere because

A

It is highly inflammable

B

it is the lightest gas

C

it is absorbed by plants

D

it immediately combines with oxygen to form water

B

Correct Answer: B. it is the lightest gas

90078195. Petroleum is a mixture of

A

elements

B

hydrocarbons

C

polymers

D

salts

B

Correct Answer: B. hydrocarbons

90102196. The BOD values of water indicate the

A

amount.of organic debris

B

amount of oxygen used for biochemical oxidation

C

amount of oxygen used for biochemical reduction,

D

amount of ozone used for biochemical oxidation

B

Correct Answer: B. amount of oxygen used for biochemical oxidation

90024197. Candle is a mixture of

A

Paraffin was and stearic acid

B

Beeswax and stearic acid

C

Higher fatty acids and stearic acid

D

Beeswax and paraffin wax

A

Correct Answer: A. Paraffin was and stearic acid

90138198. The purest form of Iron is:

A

Cast iron

B

Steel

C

Pig iron

D

Wrought iron

D

Correct Answer: D. Wrought iron

90203199. Which the following coal contains 90 percent of carbon?

A

Anthracite

B

Bitumen

C

Lignite

D

Peat

A

Correct Answer: A. Anthracite

90152200. Water is not effective in extinguishing a fire caused by petrol because

A

the flame is too hot for water to cool it down

B

water and petrol react chemically

C

water and petrol are miscible with each other

D

water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

D

Correct Answer: D. water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

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