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 Chemistry Questions

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Q:

When a chemical bond is broken energy is

A) transferred B) released
C) used D) None of the above
 
Answer & Explanation Answer: C) used

Explanation:

Bond breaking is an endothermic process.

Hence, bond breakage needs an amount of energy and uses some energy based on the strength of the bond to break the bond.

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Q:

Liquid sodium is being considered as

A) engine coolant B) bleaching agent
C) antiseptic D) None of the above
 
Answer & Explanation Answer: A) engine coolant

Explanation:

Liquid sodium is being considered as engine coolant.

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Q:

The principal quantum number indicates what property of an electron?

A) energy of electron B) distance of electron from nucleus
C) both a & b D) number of subshells
 
Answer & Explanation Answer: C) both a & b

Explanation:

The principal quantum number is the property of an electron which determines the energy of electron and the distance of electron from the nucleus of an atom.

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Q:

Which of the following is an Inert Gas?

A) Hydrogen B) Nitrogen
C) Oxygen D) Argon
 
Answer & Explanation Answer: D) Argon

Explanation:
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Q:

Which of the following equals one atomic mass unit?

A) one-twelfth the mass of one carbon-12 atom B) the mass of one electron
C) one-sixth the mass of one helium-4 atom D) the mass of one carbon-12 atom
 
Answer & Explanation Answer: A) one-twelfth the mass of one carbon-12 atom

Explanation:

One atomic mass unit (AMU) is equal to the one-twelfth the mass of one carbon-12 atom.

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Q:

Magnesium is a constituent metal of __________

A) Chlorophyll molecule B) DNA
C) Mitochondria D) Ribosomes
 
Answer & Explanation Answer: A) Chlorophyll molecule

Explanation:
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Q:

Which gas is a source of natural groundwater pollution?

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

Explanation:

Radon gas is a source of natural groundwater pollution.

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Q:

An ionic bond is formed when

A) sharing of electrons B) transfer of electrons
C) Both A & B D) losing of protons
 
Answer & Explanation Answer: B) transfer of electrons

Explanation:

An ionic bond is formed in between the two atoms with the transfer of electrons from an atom to the other to become stable after pairing.

an_ionic_bond_is_formed_when1535690989.jpg image

The atom which has low ionization energy will give some of its electrons to get stable electronic configuration .

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