Chemistry Questions

Q:

In a combination reaction there can be ______.

 

I. two or more than two reactants

II. two or more than two products

III. only one product

 

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

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Q:

Which one of the following statements would be INCORRECT to use?

 

A) An atom of a compound B) A mole of an element
C) A mole of a compound D) An atom of an element
 
Answer & Explanation Answer: A) An atom of a compound

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Q:

Apart from proposing atomic theory, what did John Dalton researched on?

 

A) Plants B) Colour blindness
C) Penicillin D) Plastic
 
Answer & Explanation Answer: B) Colour blindness

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Q:

Fill in the blank with the most appropriate option.

 

Ethanol is denatured to ___.

 

A) make it unsuitable for drinking B) make it suitable for drinking
C) increase its stability D) make it suitable as an antiseptic
 
Answer & Explanation Answer: A) make it unsuitable for drinking

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Q:

Find the similarity in the following :

 

Carbon, Silicon, Boron, Arsenic

 

A) All of them are gases B) All of them are non-metals
C) All of them are metals D) No similarity
 
Answer & Explanation Answer: B) All of them are non-metals

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Q:

Washing soda is used ______.

 

I. for removing permanent hardness of water

 

II. for disinfecting drinking water

 

III. as a cleaning agent for domestic purpose

 

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

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Q:

An atom can achieve octet by ______.

 

I. sharing electron

II. gaining electron

III. losing electron

 

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

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Q:

Ionic compounds ______.

 

I. have high boiling point

II. have high melting point

III. conduct electricity in solution

 

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

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