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 Chemistry Questions

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Q:

Which of the following is not soluble in water?

A) sodium chloride B) potassium sulfate
C) copper(II) hydroxide D) silver nitrate
 
Answer & Explanation Answer: B) potassium sulfate

Explanation:

We know that,

All nitrates are soluble in water.

All chlorides are soluble in water with the exception of those formed with silver , lead , mercury ions as all halides are soluble.

Sulphates are soluble in water.

Hydroxides are not soluble in water.

 

Hence, copper(II) hydroxide is not soluble in water.

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Q:

Chlorine gas is used in the manufacture of:

A) Baking powder B) Bleaching powder
C) Baking soda D) Washing soda
 
Answer & Explanation Answer: B) Bleaching powder

Explanation:
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Q:

Atomic number is always equal to ______.

A) Number of protons B) Number of neutrons
C) Number of electrons D) Sum of protons and neutrons  
 
Answer & Explanation Answer: A) Number of protons

Explanation:
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Q:

Arrange the following compounds in order of increasing acidity?

A) o-cresol < phenol < o-nitrophtenol B) phenol < o-nitrophtenol < o-cresol
C) o-nitrophtenol < o-cresol < phenol D) None of the above
 
Answer & Explanation Answer: A) o-cresol < phenol < o-nitrophtenol

Explanation:
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Q:

What two elements are used to make bronze?

A) Lead and copper B) copper and tin
C) Tin and lead D) copper and iron
 
Answer & Explanation Answer: C) Tin and lead

Explanation:

The two elements that are used to make bronze are tin and lead.

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Q:

The chemical makeup of a rock is

A) Nutrients B) Minerals
C) Metals D) Water
 
Answer & Explanation Answer: B) Minerals

Explanation:

The chemical composition of a rock is mainly minerals.

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Q:

Isotopes are atoms of the same element that have different

A) mass numbers B) atomic numbers
C) protons D) All of the above
 
Answer & Explanation Answer: A) mass numbers

Explanation:

Isotopes are atoms of the same element that have different mass numbers.

Example : Hydrogen, Deutirium and tritium all these have different mass but same atomic numbers.

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Q:

German Silver contains

A) 100% pure silver B) 10% silver
C) 1% silver D) 0% silver
 
Answer & Explanation Answer: D) 0% silver

Explanation:

German Silver is an alloy of copper, nickel and zinc. It is composed of 60% copper, 20% nickel and 20% zinc. Due to its white-silverish appearance it is named as german silver but it contains no silver in it.

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