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 Chemistry Questions

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Q:

Among the given nutrients, milk is a poor source of

A) Calcium B) Protein
C) Vitamin C D) Carbohydrates
 
Answer & Explanation Answer: C) Vitamin C

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Q:

Methane contributes towards global warming so it is called a _________________ gas.

 

A) poisonous B) carcinogenic
C) infectious D) greenhouse
 
Answer & Explanation Answer: D) greenhouse

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Q:

Dissolving is best described as

 

A) molecules breaking into ions B) a change from a solid to a liquid
C) breaking covalent bonds D) a mingling of molecules and/or ions
 
Answer & Explanation Answer: D) a mingling of molecules and/or ions

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Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid D) Potassium dichromatic-sulphuric acid
 
Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

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Q:

Brass gets discoloured in air because of the presence of which of the following gases in air  ?

A) Hydrogen sulphide B) Oxygen
C) Nitrogen D) Carbon dioxide
 
Answer & Explanation Answer: A) Hydrogen sulphide

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Q:

What is the structure of IF7 ?

A) Triagonal bipyramid B) Pentagonal bipyramid
C) Square pyramid D) tetrahedral
 
Answer & Explanation Answer: B) Pentagonal bipyramid

Explanation:

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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Q:

In modern periodic table while going from top to bottom in a group ______.

 

A) size of an atom increases B) size of an atom decreases
C) ionisation energy of an atom increases D)  size and ionisation energy of an atom increases
 
Answer & Explanation Answer: D)  size and ionisation energy of an atom increases

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Q:

SnCl2 + 2HgCl2 ---> Hg2Cl2 + SnCl4

 

In the given reaction

 

A) HgCl2 is oxidised B) SnCl2 is oxidised
C) Hg2Cl2 is oxidised D) SnCl2 is reduced
 
Answer & Explanation Answer: B) SnCl2 is oxidised

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