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Q:

Which one of the followingis notan allotrope of carbon?

A) Coal B) Diamond
C) Graphite D) Graphene
 
Answer & Explanation Answer: A) Coal

Explanation:

Allotropy is the property of some chemical elements to exist in two or more different forms, or allotropes, when found in nature. There are several allotropes of carbon like diamond, graphite, graphene, fullerene, etc.Coal is not an allotrope of carbon because it is not 100% carbon. It contains lot of silica, sulphur and other compounds of carbon apart from carbon.

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Q:

Crystallisation is an example of?

A) Physical Change B) Chemical Change
C) Chemical Reaction D) Galvanisation
 
Answer & Explanation Answer: A) Physical Change

Explanation:
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Q:

Which of the following is a mixture?

A) Water B) Air
C) Carbon dioxide D) Oxygen
 
Answer & Explanation Answer: B) Air

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Q:

Acid Rain has pH value of

A) 5.5 or less B) 12.5 or more
C) 10.5 or more D) 8.5 or more
 
Answer & Explanation Answer: A) 5.5 or less

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Q:

Which type of Ethanol is made from sources like molasses, sugarcane, sugar beet, sorghum and edible oil seeds?

 

A) 2G ethanol B) 1G ethanol
C) Clean ethanol D) 3G ethanol
 
Answer & Explanation Answer: B) 1G ethanol

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Q:

How many atoms are present in one molecule of Ozone?

A) 4 B) 1
C) 2 D) 3
 
Answer & Explanation Answer: D) 3

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Q:

Which one of the following triad represents Dobereiner's Triad?

A) Li, Na, K B) Na, Sr, Br
C) Li, K, Na D) Li, Ca, C1
 
Answer & Explanation Answer: A) Li, Na, K

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Q:

Who stated the following law : 'The properties of the elements are the periodic function of their atomic masses'?

A) Dobereiner B) Moseley
C) Newlands D) Mendeleev
 
Answer & Explanation Answer: D) Mendeleev

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