Chemistry Questions

Q:

Magnesium oxide (MgO) + Water (H2O) = ?

A) [Mg(OH)] B) [Mg(O2H)2]
C) [Mg2(OH)] D) [Mg(OH)2]
 
Answer & Explanation Answer: D) [Mg(OH)2]

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Q:

Name the noble gas which is placed in the third period and eighth group of the Modern Periodic table.

A) Helium B) Argon
C) Neon D) Krypton
 
Answer & Explanation Answer: B) Argon

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Q:

Who invented the modern periodic table?

A) Faraday B) Mendeleev
C) Newton D) Bohr
 
Answer & Explanation Answer: B) Mendeleev

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Q:

Which of the following is a commercial source of energy?

A) Agricultural waste B) Dried dung
C) Sun D) Natural gas
 
Answer & Explanation Answer: D) Natural gas

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Q:

___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.

A) Carbon dioxide B) Methane
C) Greenhouse D) Ozone
 
Answer & Explanation Answer: C) Greenhouse

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Q:

Find the odd one out.

A) NaCl B) Na2CO3
C) H2O D) He
 
Answer & Explanation Answer: D) He

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Q:

Which one of the following non­metals shows allotropy in the liquid state?

A) Carbon B) Sulphur
C) Phosphorous D) Bromine
 
Answer & Explanation Answer: B) Sulphur

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Q:

Which of the following has pH value 7?

A) Pure Water B) H2SO4
C) Sodium Carbonate D) HCl
 
Answer & Explanation Answer: A) Pure Water

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