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Chemistry MCQs for NEET — Practice Questions with Answers

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NEET 2023

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Match List-I (Oxoacids of Sulphur) with List-II (Bonds):

List-I	List-II
A. Peroxodisulphuric acid (H₂S₂O₈)	I. 2 S–OH, 4 S=O, 1 S–O–S
B. Sulphuric acid (H₂SO₄)	II. 2 S–OH, 1 S=O
C. Pyrosulphuric acid (H₂S₂O₇)	III. 2 S–OH, 4 S=O, 1 S–O–O–S
D. Sulphurous acid (H₂SO₃)	IV. 2 S–OH, 2 S=O

A. A-I, B-III, C-II, D-IV B. A-III, B-IV, C-I, D-II C. A-I, B-III, C-IV, D-II D. A-III, B-IV, C-II, D-I

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Explanation

Peroxodisulphuric has peroxo (O–O); pyrosulphuric has –O– (no peroxo); sulphuric has 2 S=O; sulphurous has 1 S=O.

NEET 2023

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On balancing the given redox reaction

$$a\,\text{Cr}_2\text{O}_7^{2-} + b\,\text{SO}_3^{2-}(\text{aq}) + c\,\text{H}^+(\text{aq}) \rightarrow 2a\,\text{Cr}^{3+}(\text{aq}) + b\,\text{SO}_4^{2-}(\text{aq}) + \tfrac{c}{2}\,\text{H}_2\text{O}(\ell)$$

the coefficients a, b and c are found to be, respectively:

A. 1, 3, 8 B. 3, 8, 1 C. 1, 8, 3 D. 8, 1, 3

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Explanation

Cr₂O₇²⁻ gains 6e (a=1); SO₃²⁻ → SO₄²⁻ loses 2e (b=3); charge balance with H⁺: c = 8.

NEET 2023

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Pumice stone is an example of:

A. sol B. gel C. solid sol D. foam

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Explanation

Gas dispersed in solid → solid foam (pumice).

NEET 2023

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Which complex compound is most stable?

A. $[\text{Co(NH}_3)_4(\text{H}_2\text{O})\text{Br}](\text{NO}_3)_2$ B. $[\text{Co(NH}_3)_3(\text{NO}_3)_3]$ C. $[\text{CoCl}_2(\text{en})_2]\text{NO}_3$ D. $[\text{Co(NH}_3)_6]_2(\text{SO}_4)_3$

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Explanation

$[\text{Co(NH}_3)_6]^{3+}$ is exceptionally inert and stable with six identical strong-field ligands.

NEET 2023

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Consider the following reaction:

$$\text{C}_6\text{H}_5\text{CH}_2\text{-O-C}_6\text{H}_5 \xrightarrow[\Delta]{\text{HI}} A + B$$

Identify products A and B.

A. A = C₆H₅–CH₃ and B = C₆H₅–OH B. A = C₆H₅–CH₂OH and B = C₆H₅–I C. A = C₆H₅–CH₂I and B = C₆H₅–OH D. A = C₆H₅–CH₃ and B = C₆H₅–I

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Explanation

In ArOR + HI, the alkyl side is cleaved → RI; the aryl side becomes ArOH.

NEET 2023

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Identify the final product [D] obtained in the following sequence:

$$\text{CH}_3\text{CHO} \xrightarrow[(ii)\,\text{H}_3\text{O}^+]{(i)\,\text{LiAlH}_4} [A] \xrightarrow[\Delta]{\text{H}_2\text{SO}_4} [B] \xrightarrow{\text{HBr}} [C] \xrightarrow{\text{C}_6\text{H}_5\text{Br},\ \text{Na/dry ether}} [D]$$

A.
ethylbenzene B.
biphenyl C. $\text{CH}_3\!-\!\text{CH}_2\!-\!\text{CH}_2\!-\!\text{CH}_3$ (butane) D. $\text{HC}\!\equiv\!\text{C}^{\ominus}\,\text{Na}^{\oplus}$ (sodium acetylide)

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Explanation

CH₃CHO → CH₃CH₂OH (A) → CH₂=CH₂ (B) → CH₃CH₂Br (C) → Wurtz with PhBr/Na → PhCH₂CH₃ = ethylbenzene.

NEET 2023

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Given below are two statements:

Statement I: The nutrient deficient water bodies lead to eutrophication.

Statement II: Eutrophication leads to decrease in the level of oxygen in the water bodies.

Choose the correct answer:

A. Both true. B. Both false. C. I correct, II false. D. I incorrect, II true.

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Explanation

Eutrophication is caused by NUTRIENT-RICH (not deficient) water; it does deplete dissolved O₂.

NEET 2023

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Which amongst the following will be most readily dehydrated under acidic conditions?

A. B. C. D.

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Explanation

Dehydration is easier when the carbocation formed is not destabilised by a nearby EWG. In (D) the NO₂ is far from the OH carbon, so the 2° cation is least destabilised.

NEET 2023

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What fraction of one edge-centred octahedral void lies in one unit cell of fcc?

A. 1/2 B. 1/3 C. 1/4 D. 1/12

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Explanation

An edge is shared by 4 unit cells → each edge-centred void contributes 1/4.

NEET 2023

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The reaction that does NOT take place in a blast furnace between 900 K to 1500 K temperature range during extraction of iron is:

A. $\text{Fe}_2\text{O}_3 + \text{CO} \rightarrow 2\,\text{FeO} + \text{CO}_2$ B. $\text{FeO} + \text{CO} \rightarrow \text{Fe} + \text{CO}_2$ C. $\text{C} + \text{CO}_2 \rightarrow 2\,\text{CO}$ D. $\text{CaO} + \text{SiO}_2 \rightarrow \text{CaSiO}_3$

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Explanation

Fe₂O₃ → FeO occurs in the upper, cooler part of the furnace (≈500–800 K), not in the 900–1500 K zone.

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