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 Chemistry Questions

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Q:

Which of the following inert gases is placed in period 4 of the periodic table?

A) Kr B) Rn
C) Xe D) Ar
 
Answer & Explanation Answer: A) Kr

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Q:

The hazardous component in most antifreeze is

A) Ethane alcohol B) Ethylene Glycol
C) Ehtylene D) Ethene
 
Answer & Explanation Answer: B) Ethylene Glycol

Explanation:

Ethylene Glycol is an antifreeze is an additive which lowers the freezing point of a water-based liquid and increases its boiling point. 

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Q:

Atoms of same element having different mass numbers are called__________

A) Isobars B) Isotopes
C) Isotones D) Isomers
 
Answer & Explanation Answer: B) Isotopes

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Q:

Activated Charcoal is used to remove colouring matter from pure substances by_______

A) Bleaching B) Oxidation
C) Adsorption D) Reduction
 
Answer & Explanation Answer: C) Adsorption

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Q:

Of the following commonly used materials, the one that is not an alloy is

A) Steel B) Brass
C) Bronze D) Copper
 
Answer & Explanation Answer: D) Copper

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Q:

A solution contains 33 g of common salt in 320 g of water. Calculate the concentration in terms of mass, by mass percentage of the solution.

A) 13.05% B) 9.09 g
C) 9.35g D)  9.35%
 
Answer & Explanation Answer: D)  9.35%

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Q:

Which chemical is present in the cells of cork of tree which makes them impervious to gases and water

A) Cellulose B) Suberin
C) Pectin D) Lignin
 
Answer & Explanation Answer: B) Suberin

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2 1395
Q:

In a compound the elements are always present in definite proportions by ______

A) mass B) volume
C) size D) No option is correct
 
Answer & Explanation Answer: A) mass

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