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Chemistry MCQs for NEET — Practice Questions with Answers

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Among LiCl, BeCl₂, BCl₃ and CCl₄, the covalent bond character follows the order-

LiCl < BeCl₂ > BCl₃ > CCl₄

LiCl > BeCl₂ < BCl₃ < CCl₄

LiCl < BeCl₂ < BCl₃ < CCl₄

LiCl > BeCl₂ > BCl₃ > CCl₄

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Explanation

The covalent character increases with decreasing electronegativity difference.

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Which follows octet rule-

FeCl₂

AgCl

CaCl₂

CuCl

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Explanation

Because in other compound there are more than 8e^- in outermost shell of central atom.

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The type of bonds present in N₂O₅ are-

Only covalent

Only ionic

Ionic and covalent

Covalent and coordinate

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Which is not true according to VBT-

A covalent bond is formed by the overlapping of orbitals with unpaired electrons of opposite spins.

A covalent bond is formed by the overlapping of orbitals with unpaired electrons of same spin.

The greater the extent of overlapping the stronger is the bond.

Overlapping takes place only in the direction of maximum electron density of the orbital.

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Explanation

Electrons of same spin never combine to form a bond. Other facts are true for VBT.

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The molecule having a high dipole moment among the following is-

H₂S

BF₃

CO₂

CCl₄

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Explanation

It is an unsymmetrical molecule with the bond angle H-S-H slightly greater than $90^{\circ}$ .

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Allyl cyanide; C₃H₅CN has-

9 sigma bonds and 4 pi bonds

9 sigma bonds, 3 pi bonds and 1 lone pairs

8 sigma bonds and 5 pi bonds

8 sigma bonds, 3 pi bonds and 4 non-bonding electrons.

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The hybridization of carbon atoms in C-C single bond of $C \equiv C - C H = C H_{2}$ is-

$s p^{3} - s p^{3}$

$s p^{2} - s p$

$s p - s p$

$s p^{3} - s p$

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Explanation

As the first carbon has triple bond and second one has double bond with other two carbon atom.

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C-C bond in C₂H₆ undergoes heterolytic fission, the hybridisation of carbon is/are-

$s p^{2}$

$s p^{3}$

$s p^{2}, s p^{3}$

$s p, s p^{2}$

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Explanation

During heterolytic fission there will be formation of CH₃⁺ and CH₃^- which has sp² and sp³ hybridization respectively.

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The enolic form of acetone contains how many $σ$ bonds (a), $π$ bonds (b) and lone pairs (c)-

9a, 1b, 2c

8a, 2b, 2c

10a, 1b, 1c

9a, 2b, 1c

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When is the deviation more in the behaviour of a gas from the ideal gas equation pV=nRT?

AT high temperature and low pressure

At low temperature and high pressure

At high temperature and high pressure

At low temperature and low pressure

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Explanation

(b) Gases show deviation from ideal gas behaviour when the temperature is low and pressure is high. At low temperature, the volume of one molecule is not negligible in comparison to total volume and intermolecular force of attraction is maximum at low temperature and high pressure.

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