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 Chemistry Questions

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Q:

What is the maximum  number of states of matter?

A) Three B) Four
C) Five D) Variable
 
Answer & Explanation Answer: C) Five

Explanation:

There   are five known   states   of matter:    solids,    liquids,    gases, plasma and Bose-Einstein condensates.  The  main  difference in the structures of each state is in the densities of the particles.

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1 1937
Q:

Rust is formed from iron and

A) Carbon B) Oxygen
C) Hydrogen D) All of the above
 
Answer & Explanation Answer: B) Oxygen

Explanation:

Rust is formed from iron and oxygen.

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3 1934
Q:

In which of the following MgCl2 is soluble?

A) Petrol B) Acetone
C) Kerosene D) Water
 
Answer & Explanation Answer: D) Water

Explanation:
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2 1934
Q:

Calcium salts used as fertilizer is:

A) Calcium Carbide B) Calcium Carbonate
C) Calcium Cyanide D) Calcium Sulphate
 
Answer & Explanation Answer: D) Calcium Sulphate

Explanation:
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3 1933
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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0 1933
Q:

The upper part of the heterosphere is composed almost completely of which gas?

A) Ozone B) Nitrogen
C) Oxygen D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

Explanation:
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1 1933
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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2 1930
Q:

Which of the metals has the maximum thermal conductivity?

A) Iron B) Aluminium
C) Silver D) Copper
 
Answer & Explanation Answer: C) Silver

Explanation:
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1 1930