Chemistry questions and answers For Competitive Exam P22

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Page 22

90020211. Bone ash contains

A

Calcium sulphate

B

Phosphoric sulphate

C

Calcium phosphate

D

Calcium hypophosphate

C

Correct Answer: C. Calcium phosphate

90016212. Aspirin is chemically known as

A

methyl salicylate

B

hydroxysalicylate

C

acetylsalicylic acid

D

alkylsalicylic acid

C

Correct Answer: C. acetylsalicylic acid

90068213. Name the particle that is most essential to continue the chain reaction during the fission of uranium

A

Electron

B

Proton

C

Neutron

D

Positron

C

Correct Answer: C. Neutron

90143214. The substance that is added to make natural rubber strong and more bouncy is

A

Polythene

B

Sponge

C

Sulphur

D

Chlorine

C

Correct Answer: C. Sulphur

90036215. Diamond is harder than graphite because of

A

difference in layers of atoms

B

tetrahedral structure of diamond

C

difference of crystalline structures

D

None of these

A

Correct Answer: A. difference in layers of atoms

90002216. A metal is exposed to the atmosphere for some time. It becomes coated with green carbonate. The metal must be

A

silver

B

copper

C

aluminium

D

zinc

B

Correct Answer: B. copper

90139217. The purest form of water is

A

tap water

B

rainwater

C

groundwater

D

distilled water

B

Correct Answer: B. rainwater

90003218. A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

A

From brown to blue-black

B

From brown to orange-red

C

From blue to pink

D

From pink to blue-green

A

Correct Answer: A. From brown to blue-black

90009219. An atomic clock is based on transitions in

A

Sodium

B

Caesium

C

Magnesium

D

Aluminium

B

Correct Answer: B. Caesium

90087220. Slag is a name given for

A

molten Iron

B

molten sand

C

molten alumina

D

molten calcium silicate

C

Correct Answer: C. molten alumina

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