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 Chemistry Questions

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Q:

Which of the following metals is a liquid at room temperature?

A) Lithium B) Mercury
C) Sodium D) Calcium
 
Answer & Explanation Answer: C) Sodium

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Q:

Which one of the followingis notan allotrope of carbon?

A) Coal B) Diamond
C) Graphite D) Graphene
 
Answer & Explanation Answer: A) Coal

Explanation:

Allotropy is the property of some chemical elements to exist in two or more different forms, or allotropes, when found in nature. There are several allotropes of carbon like diamond, graphite, graphene, fullerene, etc.Coal is not an allotrope of carbon because it is not 100% carbon. It contains lot of silica, sulphur and other compounds of carbon apart from carbon.

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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:

The credit for classifying the elements on the basis of their atomic masses goes to

A) John Dalton B) John Alexander Reina Newlands
C) Dmitri Mendeleev D) Johann Wolfgang Dobereiner
 
Answer & Explanation Answer: C) Dmitri Mendeleev

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Q:

In the Modern Periodic Table, elements are arranged in

A) increasing atomic mass number B) increasing atomic number
C) decreasing atomic mass number D) decreasing atomic number
 
Answer & Explanation Answer: B) increasing atomic number

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Q:

Biogas is produced from biomass by

A) destructive distillation B) fractional distillation
C) anaerobic fermentation D) dry distillation
 
Answer & Explanation Answer: C) anaerobic fermentation

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Q:

The smell that we get when LPG cylinder leaks is due to the presence of

A) Nitrogen peroxide B) Carbon monoxide
C) Sulphur compound D) Carbon dioxide
 
Answer & Explanation Answer: C) Sulphur compound

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Q:

Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic table?

A) Scandium B) Gallium
C) Titanium D) Germanium
 
Answer & Explanation Answer: B) Gallium

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