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Q:

Air ___________________ are the substances which contaminate the air.

A) Reactants B) Irritants
C) Resistants D) Pollutants
 
Answer & Explanation Answer: D) Pollutants

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Q:

Which of the following is essential for the synthesis of thyroxin?

A) Potassium B) Calcium
C) Iodine D) Sodium
 
Answer & Explanation Answer: C) Iodine

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Q:

The most abundant element in the earth's atmosphere is

A) Argon B) Nitrogen
C) Oxygen D) Krypton
 
Answer & Explanation Answer: B) Nitrogen

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Q:

Which of the following statement is CORRECT?

A) Gold and Silver are not ductile. B) Phophorus and Nitrogen are ductile.
C) Copper and Platinum are ductile. D) Sulphur and Phophorus are sonorous
 
Answer & Explanation Answer: C) Copper and Platinum are ductile.

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Q:

Name the reddish brown gas evolved when Lead Nitrate is heated strongly.

A) Nitric oxide B) Nitrogen di oxide
C) Di Nitrogen Oxide D) Nitrogen pentoxide
 
Answer & Explanation Answer: B) Nitrogen di oxide

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Q:

Zeolite is

A) hydrated ferric oxide B)  hydrated sodium aluminium silicate
C)  sodium hexameta phosphate D)  sodium tetra borate
 
Answer & Explanation Answer: B)  hydrated sodium aluminium silicate

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Q:

Nitrification is the biological process of converting

A) N2 into nitrate B) N2 into nitrite
C) Ammonia into nitrite D) Ammonia into N2
 
Answer & Explanation Answer: C) Ammonia into nitrite

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Q:

According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.

A) molecule B) atom
C) compound D) element
 
Answer & Explanation Answer: B) atom

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