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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:

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:

___________ 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:

_____ is the major component of natural gas.

A) Acetone B) Methane
C) Chlorine D) Hexane
 
Answer & Explanation Answer: B) Methane

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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:

What are isobars?

A) Elements with same atomic number but different mass number B) Elements with different atomic number but same mass number
C) Elements with different atomic number and different mass number D) Elements with same atomic number and same mass number
 
Answer & Explanation Answer: B) Elements with different atomic number but same mass number

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Q:

The common name of dichlorodifluoromethane is _____.

A) galena B) Freon
C) gypsum D) borax
 
Answer & Explanation Answer: B) Freon

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Q:

Anions are formed by _____.

A) losing of electrons B) gaining of electrons
C) gaining of neutrons D) losing of neutrons
 
Answer & Explanation Answer: B) gaining of electrons

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