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 Chemistry Questions

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Q:

Match the following items of column A with column B.

 

 

A) I – 3, II – 1, III – 2   B) I – 2, II – 1, III – 3  
C) I – 2, II – 3, III – 1   D) I – 1, II – 2, III – 3
 
Answer & Explanation Answer: B) I – 2, II – 1, III – 3  

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Q:

Which one of the following is the most characteristic property of an element?

 

A) Density B) Boiling point
C) Mass number D) Atomic number
 
Answer & Explanation Answer: D) Atomic number

Explanation:

Atomic  number  is  the  fundamental properties  of  an  element.  Every atom  is  identified  by  its  unique atomic  number.  Atomic  number  is equal  to  the  number  of  protons present in an atom of the element.

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Q:

Which species is a conjugate acid of OH- ?

 

A) H+ B) O2- 
C) OH D) H2O
 
Answer & Explanation Answer: D) H2O

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Q:

By volume, 21% of air is _______________.

 

A) hydrogen B) oxygen
C) nitrogen D) carbon dioxide
 
Answer & Explanation Answer: B) oxygen

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Q:

Which of the following is NOT a waste material removed from blood in the kidney?

 

A) Ammonia B) Carbon dioxide
C) Urea D) Uric acid
 
Answer & Explanation Answer: B) Carbon dioxide

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Q:

Metals are generally ______.

I. Ductile

II. Malleable

III. Poor conductors of heat

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and II

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Q:

Water which is suitable for drinking is called _______________ water.

 

A) hygienic B) sparkling
C) potable D) sanitary
 
Answer & Explanation Answer: C) potable

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Q:

What enables an electric current to flow in a circuit?

 

A) The motion of electrons B) The motion of neutrons
C) The motion of positrons D) The motion of protons
 
Answer & Explanation Answer: A) The motion of electrons

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