WBCS Practice Set on General Science (Chemistry) P9

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Page 9

169381. Chemically Aspirin is :

A

Methyl salicylate

B

Ethyl salicylate

C

Acetylsalicylic acid

D

Sodium salicylate

C

Correct Answer: C. Acetylsalicylic acid

169482. Phenyl used in household work is a derivative of

A

Benzene

B

Anthracene

C

Methyl alcohol

D

Tartaric acid

A

Correct Answer: A. Benzene

169583. Dry ice is made up of

A

Hydrocarbon

B

Carbon dioxide

C

Water

D

Chlorine

B

Correct Answer: B. Carbon dioxide

169684. The geometry of SF4 is

A

octahedral

B

see-saw

C

square planar

D

tetrahedral

B

Correct Answer: B. see-saw

169785. The most abundant ions in the Bay of Bengal water are

A

Mg²⁺ and SO₄^2-

B

Fe²⁺ and Cl^-

C

Na⁺ and Cl^-

D

H⁺ and OH^-

A

Correct Answer: A. Mg²⁺ and SO₄^2-

169886. The most malleable metal is

A

Iron

B

Gold

C

Platinum

D

Silver

B

Correct Answer: B. Gold

169987. The white vitriol is

A

MgSO4 , 7H2O

B

CuSO4 , 5H2O

C

FeSO4 , 7H2O

D

ZnSO4 , 7H2O

D

Correct Answer: D. ZnSO4 , 7H2O

170088. Rate of radiation of heat from a body is the highest if its surface is

A

Smooth but black

B

Rough but black

C

White

D

Smooth

A

Correct Answer: A. Smooth but black

170189. Galvanization is deposition of

A

tin on iron

B

copper on iron

C

zinc on iron

D

aluminum on iron

C

Correct Answer: C. zinc on iron

170290. How many grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH (Atomic weight : Na = 23, O=16, H=1)

A

4

B

1

C

2

D

20

C

Correct Answer: C. 2

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