Chemistry Questions

Q:

Which among the following has highest electron affinity?

A) Chlorine B) Fluorine
C) Helium D) Xenon
 
Answer & Explanation Answer: A) Chlorine

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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:

Oxide of which of the following will turn red litmus blue?

A) Magnesium B) Phosphorus
C) Sulphur D) Carbon
 
Answer & Explanation Answer: A) Magnesium

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Q:

Electrons in the highest energy level of an atom are called ________.

A) valence protons B) orbital protons
C) valence electrons D) orbital electrons
 
Answer & Explanation Answer: C) valence electrons

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Q:

Atomic Number of Hydrogen is _______.

A) 4 B) 3
C) 2 D) 1
 
Answer & Explanation Answer: D) 1

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Q:

Which electron dot formula represents a polar molecule?

A) A B) B
C) C D) D
 
Answer & Explanation Answer: B) B

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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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Q:

_______________ of a material is defined as the minimum amount of the work necessary to remove a free electron from the surface of the material.

A) The electro-repulsive force B) The coulomb factor
C) The power factor D) The work function
 
Answer & Explanation Answer: D) The work function

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