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 Chemistry Questions

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Q:

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

A) Ar B) HN3
C) CO2 D) C4H6
 
Answer & Explanation Answer: C) CO2

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Q:

Constantan is alloyed from ...... metals.

A) Ni, Ti, Fe, Cr B) Cu, Ni, Mn
C) Ni, Cr, Mn, Fe D) Cu, Ni
 
Answer & Explanation Answer: D) Cu, Ni

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Q:

What is the ratio of masses of hydrogen and oxygen in the water?

A) 1 : 4 B) 1 : 8
C) 1 : 16 D) 1 : 64
 
Answer & Explanation Answer: B) 1 : 8

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Q:

Give an example of a salt which gives an aqueous solution of pH less than 7.

A) Ammonium chloride B) Sodium carbonate
C) Sodium bicarbonate D) Sodium chloride
 
Answer & Explanation Answer: A) Ammonium chloride

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Q:

Iron and manganese present as pollutants in water cannot be removed by_____

A) oxidation followed by settling and filtration B) chlorination
C) ion exchange process D) lime soda process or manganese zeolite process
 
Answer & Explanation Answer: B) chlorination

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Q:

The Chemical formula of Acetic acid is _____.

A) CH3COH B) CH3COOH
C) CH3COCH3 D) CH2COOH
 
Answer & Explanation Answer: D) CH2COOH

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Q:

Which of the following represents an ion?

A) a particle having 9 protons, 9 neutrons, and 10 electrons B) a particle having 19 protons, 21 neutrons, and 19 electrons
C) a particle having 14 protons, 14 neutrons, and 14 electrons D) a particle having 1 proton, 3 neutrons, and 1 electron
 
Answer & Explanation Answer: A) a particle having 9 protons, 9 neutrons, and 10 electrons

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Q:

Release of which among the following is the primary reason for depletion of the ozone layer?

A) Nitrous oxide B) Hydrogen dioxide
C) Chlorofluro carbon D) Carbon monoxide
 
Answer & Explanation Answer: C) Chlorofluro carbon

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