1099+ Important Chemistry MCQ Questions Answers

Q:

The structure of $I F^{7}$ is

A) Pentagonal bipyramid	B) Square pyramid
C) Trigonal bipyramid	D) Octahedral

Answer & Explanation Answer: A) Pentagonal bipyramid

Explanation:

Hybridisation of iodine is $s p^{3} d^{3}$

So, the structure is pentagonal bipyramid.

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Q:

Which statement is true of all atoms that are anions?

A) The atom has fewer protons than does a neutral atom of the same element.	B) The atom has more protons than electrons.
C) The atom has more neutrons than protons.	D) The atom has more electrons than protons.

Answer & Explanation Answer: D) The atom has more electrons than protons.

Explanation:

Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge.

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Q:

What is the bond order of N2+?

A) 3	B) 1.5
C) 2.5	D) 2

Answer & Explanation Answer: C) 2.5

Explanation:

Bond Order = 1/2[ Nb - Na]

where

Nb = Number of electrons in bonding molecular orbitals.

Na = Number of Electrons in antibonding molecular orbitals

Bond Order of N2⁺:

Total number of electrons: 13

Electronic Configuration= :σ1s² σ*1s² σ2s² σ*2s² π 2py² [π2pz² σ2px1 ]

Bond Order = [9-4]/2 = 5/2 = 2.5.

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Q:

Reactions that require CO2 take place in

A) the Calvin cycle alone	B) the light reactions alone
C) Both A & B	D) the chloroplast, but is not part of photosynthesis

Answer & Explanation Answer: A) the Calvin cycle alone

Explanation:

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Q:

When the nucleus of Uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. this process is called

A) nuclear fission	B) nuclear fusion
C) physical change	D) artificial radioactivity

Answer & Explanation Answer: A) nuclear fission

Explanation:

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Q:

Which of the following is the mixture

A) distilled water	B) gasoline
C) liquified petroleum gas	D) both (b) & (c)

Answer & Explanation Answer: D) both (b) & (c)

Explanation:

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Q:

A particle which is four times in mass and two times in charge that of proton is

A) helium atom	B) an alpha particle
C) deuteron	D) tritium

Answer & Explanation Answer: B) an alpha particle

Explanation:

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Q:

Which of the following is an element

A) alumina	B) brass
C) graphite	D) silicon

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