Chemistry Questions

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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Q:

Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of

A) Open system B) Closed system
C) Isobaric system D) Isothermal system
 
Answer & Explanation Answer: A) Open system

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Q:

Which of the following constitutes highest percentage of Green House gases?

A) Ethane B) Methane
C) Carbon Dioxide D) Propane
 
Answer & Explanation Answer: C) Carbon Dioxide

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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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Q:

Who stated the following law : 'The properties of the elements are the periodic function of their atomic masses'?

A) Dobereiner B) Moseley
C) Newlands D) Mendeleev
 
Answer & Explanation Answer: D) Mendeleev

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Q:

What was the element used in traditional thermometers which is highly toxic in nature?

A) Carbon B) Mercury
C) Arsenic D) Cadmium
 
Answer & Explanation Answer: B) Mercury

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Q:

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

A) B2H6 B) NF3
C) CCl3F D) C6H6
 
Answer & Explanation Answer: C) CCl3F

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Q:

Which of the following allotropes of Carbon is used as a reducing agent in metallurgy?

A) Carbon Black B) Graphite
C) Charcoal D) Coke
 
Answer & Explanation Answer: D) Coke

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