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 Chemistry Questions

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Q:

The most abundant of the rare gases i ?

 

A) Helium B) Argon
C) Neon D) Nitrogen
 
Answer & Explanation Answer: B) Argon

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Q:

Plaster of Paris ______.

 

I. changes into gypsum on mixing with water

II. is CaSO4.2H2O

III. is used for decoration

 

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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0 31432
Q:

Which of the following statements is/are true or false?

 

Statements :

 

A) H2S burns in air to give H2O and SO2

B) The decomposition of Ferrous Sulphate into Fe2O3, SO2 and SO3 occurs in the presence of heat.

 

A) Statements A and B both are true B) Statement A is true, while B is false
C) Statements A and B are false D) Statement B is true, while A is false
 
Answer & Explanation Answer: A) Statements A and B both are true

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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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1 31366
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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0 30982
Q:

Which of the following statements are CORRECT?

I. Esters are sweet smelling substance.
II Esters are used in making perfumes.
III. Functional group of ester is R-O-RꞋ.

 

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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0 30820
Q:

Out of all known elements, the minimum number is of ______.

 

A) Metals   B) Non-metals  
C) Metalloids D) No option is correct
 
Answer & Explanation Answer: C) Metalloids

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0 30790
Q:

Which is not a green house gas in the following?

 

A) Ozone B) Nitrous oxide
C) Water vapour D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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