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Q:

_____ is produced from incomplete burning of fuels such as petrol and diesel.

A) Carbon dioxide B) Carbon monoxide
C) Nitric oxide D) Nitrogen dioxide
 
Answer & Explanation Answer: B) Carbon monoxide

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Q:

What is the full form of PVC?

A) Phosphonil vinyl Carbonate B) Polyvinyl S Carbonate
C) Polyvinyl Carbonate D) Polyvinyl Chloride
 
Answer & Explanation Answer: D) Polyvinyl Chloride

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Q:

In water treatment plant, use of chloramines ensures __________

A) taste and odour control B) weed control in reservoirs
C) disinfection D) removal of permanent hardness
 
Answer & Explanation Answer: C) disinfection

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Q:

An unbalanced chemical equation is called a

A) rough chemical equation B) natural chemical equation
C) complex chemical equation D) skeletal chemical equation
 
Answer & Explanation Answer: D) skeletal chemical equation

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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:

All isotopes of the same element have ____________

A) different atomic numbers and different atomic mass B) different atomic numbers and the same atomic mass
C) the same atomic number but different atomic masses D) the same atomic number and the atomic mass
 
Answer & Explanation Answer: C) the same atomic number but different atomic masses

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Q:

Which of the following statement(s) is/are INCORRECT regarding Phosphorus?

A) Phosphorus reacts vigorously with water B) It is a non-metal
C) It catches fire on reacting with air D) It is found in group 15 of the modern periodic table
 
Answer & Explanation Answer: A) Phosphorus reacts vigorously with water

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Q:

Which compound is used in Anti-malarial drug?

A) Aspirin B) Neosporin
C) Chloroquin D) Antacid
 
Answer & Explanation Answer: C) Chloroquin

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