2
Q:

The function of nitrogen in air is 

A) to make air a moderate supporter of combustion B) to maintain the density of air constant
C) to prevent the hydrogen in air from exploding D) to reduce the poisonous nature of ozone in air

Answer:   A) to make air a moderate supporter of combustion



Explanation:

If air contained all oxygen and no nitrogen, everything would have burnt off

Subject: Chemistry
Q:

The elements belonging to groups ............ are known as 'd' block elements.

 

A) 3 to 12 B) 1 and 2
C) 13 to 18 D) 3 to 10
 
Answer & Explanation Answer: A) 3 to 12

Explanation:
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0 394
Q:

220 g of carbon dioxide contains .......... moles.

 

A) 5 B) 6
C) 3 D) 4
 
Answer & Explanation Answer: A) 5

Explanation:
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0 633
Q:

A solution contains 42 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution?

 

A) 11.6 g B) 12.6%
C) 11.6% D) 10.36%
 
Answer & Explanation Answer: C) 11.6%

Explanation:
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1 231
Q:

............ is a purple-coloured solid halogen.

 

A) Bromine B) Fluorine
C) Chlorine D) Iodine
 
Answer & Explanation Answer: D) Iodine

Explanation:
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0 163
Q:

The chemical formula of Ammonium phosphate is ............

 

A) (NH4)3PO4 B) (NH4)2PO4
C) (NH4)2P02 D) NH4PO4
 
Answer & Explanation Answer: A) (NH4)3PO4

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Q:

Which among the following has its refractive index closest to that of crown glass?

 

A) Diamond   B) Ruby  
C) Sapphire   D) Canada balsam  
 
Answer & Explanation Answer: D) Canada balsam  

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1 132
Q:

Which among the following is a cation?

 

A) Ammonium   B) Iodide  
C) Chloride   D)
 
Answer & Explanation Answer: A) Ammonium  

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1 157
Q:

Which of the following can be used as a catalyst in Hydrogenation reaction?

 

A) Barium B) Iron
C) Tungsten D) Palladium
 
Answer & Explanation Answer: D) Palladium

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