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 Chemistry Questions

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Q:

Which chemical is present in the cells of cork of tree which makes them impervious to gases and water

A) Cellulose B) Suberin
C) Pectin D) Lignin
 
Answer & Explanation Answer: B) Suberin

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Q:

Which of the following bonds are weakest in nature?

A) Single bond B) Double bond
C) Triple bond D) Hydrogen bond
 
Answer & Explanation Answer: D) Hydrogen bond

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Q:

Activated Charcoal is used to remove colouring matter from pure substances by_______

A) Bleaching B) Oxidation
C) Adsorption D) Reduction
 
Answer & Explanation Answer: C) Adsorption

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Q:

The polar ice-caps are made of ____________ water

A) Saline B) Salt
C) Sour D) Fresh
 
Answer & Explanation Answer: D) Fresh

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Q:

The conversion of hard water into soft water by boiling or adding calcium hydroxide is called _______.

A) Baker's process B) Temp's process
C) Clarke's process D) Lake's process
 
Answer & Explanation Answer: C) Clarke's process

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Q:

The phosphorus cycle differs from the biogeochemical cycles in that

A) does not have atmospheric reservoir B) uses water more
C) have atmospheric reservoir D) None of the above
 
Answer & Explanation Answer: A) does not have atmospheric reservoir

Explanation:

Unlike other gas cycles, the phosphorus cycle differs in having atmospheric reservoir. No other gases are involved in it.

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Q:

Elements that are poor conductors of heat and electricity are

A) Metals B) Non metals
C) Halogens D) Noble
 
Answer & Explanation Answer: B) Non metals

Explanation:

Elements that are poor conductors of heat and electricity are called Non metals.

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Q:

The monomer/monomers used for the synthesis of Nylon 6 is/are

A) hexamethylenediamine and adipic acid B) caprolactam
C) urea and formaldehydeD. D) phenol and formaldehyde
 
Answer & Explanation Answer: A) hexamethylenediamine and adipic acid

Explanation:

Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine

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