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 Chemistry Questions

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Q:

Diamond is harder than Graphite because of

A) tetrahedral structure of diamond B) difference of crystalline structures
C) difference of layers of atoms D) hexagonal structure of graphite
 
Answer & Explanation Answer: B) difference of crystalline structures

Explanation:

Here are the differences between Diamond and Graphite :

 

diamond_is_harder_than_graphite_because_of1557300898.jpg image

 

From the above analysis, Diamond is harder than Graphite because of the difference of crystalline structures.

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Q:

A mixture of sand and naphthalene can be seperated by __________

A) Fractional distillation B) Sublimation
C) Chromatography D) Any of them
 
Answer & Explanation Answer: B) Sublimation

Explanation:
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Q:

Harmful bacteria in drinking water cannot be destroyed by 

A) Chlorination B) boiling
C) adding caustic soda D) ozonisation
 
Answer & Explanation Answer: C) adding caustic soda

Explanation:

Water containing caustic soda cannot be used for drinking

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Q:

Antimony is

A) metal B) non metal
C) non metaloid D) metalloid
 
Answer & Explanation Answer: D) metalloid

Explanation:
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Q:

Milk is a 

A) mixture B) element
C) metal D) None of these
 
Answer & Explanation Answer: A) mixture

Explanation:
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Q:

Which statement describes the acid found in vinegar acetic acid ?

A) It feels slippery B) It reacts with Mg to produce H2
C) It tastes bitter D) It releases OH- in a solution
 
Answer & Explanation Answer: B) It reacts with Mg to produce H2

Explanation:

Acid which is present in vinegar is approximately 5 % of acetic acid. This can be confirmed by testing the vinegar with magnesium which gives out hydrogen as a gas.

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Q:

In isotopes the number of neutrons are

A) same B) different
C) both D) none
 
Answer & Explanation Answer: B) different

Explanation:
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Q:

All atoms of uranium have the same

A) Atomic mass B) Number of electrons
C) Atomic number D) Mass number
 
Answer & Explanation Answer: C) Atomic number

Explanation:

There are many isotopes of uranium and all of them have same atomic number i.e, sum of nmber of neutrons and protons.

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