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Chemistry MCQs for NEET — Practice Questions with Answers

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In terms of polar character which of the following order is correct ?

$N H_{3} < H_{2} O < H F < H_{2} S$

$H_{2} S < N H_{3} < H_{2} O < H F$

$H_{2} O < N H_{3} < H_{2} S < H F$

$H F < H_{2} O < N H_{3} < H_{2} S$

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Explanation

(b) As electronegativity difference of bond increase, polar character also increase.

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The correct order or boiling point is:

$T_{2} < D_{2} < H_{2}$

n-pentane<neo pentane

Xe<Ar<He

m-nitrophenol>o-nitrophenol

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The linear structure is possessed by :

$S n C l_{2}$

$N C O^{-}$

$N {O_{2}}^{+}$

$C S_{^{2}}$

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Explanation

(d ) $S = C = S$

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Cis-butene dioic acid $\overset{K_{a_{1}} {- H^{+}}}{⇌} {X^{-}}_{1} \overset{K_{a_{2}} {- H^{+}}}{⇌} X_{2}^{2 -}$

Trans-butene dioic acid $\overset{K_{a_{1}}' {- H^{+}}}{⇌} {Y^{-}}_{1} \overset{K_{a_{2}} \cdot {- H^{+}}}{⇌} Y_{2}^{2 -}$

The incorrect statement regarding above the information is:

$X_{2}^{2 -}$ species is more basic than $Y_{2}^{2 -}$ species

$X_{1}^{-}$ species is more basic than $Y_{1}^{-}$ species

$K_{a 1}$ is greater than $K'_{a 2}$

$K'_{a 2}$ is greater than $K'_{a 2}$

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Explanation

In the cis isomer, both carboxyl groups are on the same side of the carbon chain, making the negative charges closer. This increases the electrostatic repulsion between the carboxylate anions, making the cis isomer less stable and more acidic than the trans isomer.

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In which of the following compounds octet is complete and incomplete for all atoms:

$A l_{2} C l_{6} A l_{2} {(C H_{3})}_{6} A l F_{3} D i m e r o f B e C l_{2} D i m e r o f B e H_{2}$

IC IC IC C C

C IC IC C IC

C IC C IC IC

IC C IC IC IC

where C denotes Complete and IC incomplete.

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Explanation

In Al₂Cl₆, Al has an incomplete octet. In Al₂(CH₃)₆, both Al and C have complete octets. In AlF₃, Al has an incomplete octet, while F has a complete octet. In the dimer of BeCl₂, Be has a complete octet, while Cl has an incomplete octet. In the dimer of BeH₂, both Be and H have incomplete octets.

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In which of the following metal of metal bond is present?

Cupric chloride

stannous chloride

mercurous chloride

mercuric chloride

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Explanation

Mercurousion is represent as $H g \overset{2 +}{2}$ it is evidenced by the fact that its $μ$ =0, i.e., it is diamagnetic. it is possible only when there is presence of a metal-matal bond.

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The pair of elemnts which on combination are most likely to form an ionic compound is :

Na and Ca

K and $O_{2}$

$O_{2}$ and $C l_{2}$

$A l a n d I_{2}$

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Explanation

(b) $K O_{2}$ is an ionic compound

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The species showing $p π$ - $d π$ overlapping is :

$N {O_{3}}^{-}$

$P {O_{4}}^{3 -}$

$C {O_{3}}^{2 -}$

$N {O_{2}}^{-}$

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Explanation

(b) only P has d-orbitals.

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Which of the following interaction lies in the range of 8 - 42 kJ/mol?

$H_{2} . . . H_{2} O$

HCl...HCI

$H_{2} O$ ...HF

all

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Explanation

(d) (a) $H_{2} . . . . H_{2} O$ Dipole-induced dipole interaction (van der Waal's force) energy<8kJ/mol

(b) $H — Cl . . . . . H — CI$ Dipole-dipole interaction (van der Waal's force)<8kJ/mol

(d) all

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The number of antibonding electrons pairs in ${O_{2}}^{2 -}$ on the basis of MO theory are:

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Yes. You can attempt every Chemistry question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.