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Chemistry Questions Answers

Q51 :

When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of—

A
  

air

B
  

hydrogen

C
  

hydrogen and oxygen

D
  

water vapour

View Answer
Correct Answer: A

air

No Description Available
Q52 :

Which one of the following is a cause of acid rains?

A
  

Ozone

B
  

Ammonia

C
  

Sulphur dioxide

D
  

Carbon monoxide

View Answer
Correct Answer: C

Sulphur dioxide

No Description Available
Q53 :

The desirable range of pH for drinking water is—

A
  

6·5 to 8·5

B
  

5·0 to 6·5

C
  

6·5 to 7·0

D
  

7·0 to 8·5

View Answer
Correct Answer: A

6·5 to 8·5

No Description Available
Q54 :

The principal use of hydrofluoric acid is—

A
  

in etching glass

B
  

as a bleaching agent

C
  

as an extremely strong oxidizing agent

D
  

in the preparation of strong organic fluorine compounds

View Answer
Correct Answer: A

in etching glass

No Description Available
Q55 :

The compound C6H12O4 contains

A
  

22 atoms per mole

B
  

twice the mass percent of H as compared to the mass percent of C

C
  

six times the mass percent of C as compared to the mass percent of H

D
  

thrice the mass percent of H as compared to the mass percent of O

View Answer
Correct Answer: C

six times the mass percent of C as compared to the mass percent of H

No Description Available
Q56 :

The proposition 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as—

A
  

Avogadro's hypothesis

B
  

Gay-Lussac's hypothesis

C
  

Planck's hypothesis

D
  

Kirchhoff's theory

View Answer
Correct Answer: A

Avogadro's hypothesis

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Q57 :

Which of the following is sulphur containing amino acid?

A
  

Tryptophan

B
  

Proline

C
  

Methionine

D
  

Aspartic acid

View Answer
Correct Answer: C

Methionine

No Description Available
Q58 :

Which among the following is known as laughing gas?

A
  

Nitrous oxide

B
  

Nitric oxide

C
  

Nitrogen dioxide

D
  

Nitrogen pentoxide

View Answer
Correct Answer: A

Nitrous oxide

No Description Available
Q59 :

The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is —

A
  

Califonrium

B
  

Cesium

C
  

Calcium

D
  

Cerium

View Answer
Correct Answer: B

Cesium

No Description Available
Q60 :

Which of the following elements is a semi-conductor?

A
  

Aluminium

B
  

Silicon

C
  

Silver

D
  

Lead

View Answer
Correct Answer: B

Silicon

No Description Available
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