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 Chemistry Questions

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Q:

Which of the following is usually not an air­pollutant?

A) Hydrocarbons B) Sulphur dioxide
C) Carbon dioxide D) Nitrous oxide
 
Answer & Explanation Answer: D) Nitrous oxide

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0 1307
Q:

Binomial Nomenclature was founded by

A) Charles Darwin B) Robert Nucleus
C) Carl Linnaeus D) Lamarck
 
Answer & Explanation Answer: C) Carl Linnaeus

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2 1305
Q:

Chemical properties of isotopes .............

A) must be same B) must be different
C) need not be same D) need not be different
 
Answer & Explanation Answer: A) must be same

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0 1304
Q:

Which of the following gases are responsible for the greenhouse gas effect on Earth?

A) Water Vapour and Carbon dioxide B) Carbon dioxide and Nitrogen
C) Oxygen and Methane D) Ozone and Methane
 
Answer & Explanation Answer: A) Water Vapour and Carbon dioxide

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0 1304
Q:

In which of the following solution the concentration of H+ ion is the maximum?

A) pH 6 B) pH 8
C) pH 5 D) pH 9
 
Answer & Explanation Answer: C) pH 5

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2 1303
Q:

_____ is produced from incomplete burning of fuels such as petrol and diesel.

A) Carbon dioxide B) Carbon monoxide
C) Nitric oxide D) Nitrogen dioxide
 
Answer & Explanation Answer: B) Carbon monoxide

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1 1303
Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero. B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1. D) Hydrogen can have more than one oxidation number.
 
Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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1 1303
Q:

Which of the following is used in the preparation of tincture iodine, cough syrup and many tonics?

A) Methanol B) Ethanoic acid
C) Acetic acid D) Ethanol
 
Answer & Explanation Answer: D) Ethanol

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2 1301