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Chemistry MCQs for NEET — Practice Questions with Answers

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NEET 2023

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Given below are two statements: one is labelled Assertion A and the other Reason R.

Assertion A: A reaction can have zero activation energy.

Reason R: The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value is called activation energy.

In the light of the above statements, choose the correct answer:

A. Both A and R are true and R is the correct explanation of A. B. Both A and R are true and R is NOT the correct explanation of A. C. A is true but R is false. D. A is false but R is true.

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Explanation

Zero $E_a$ is possible if reactants already possess threshold energy; R correctly defines $E_a$ and explains A.

NEET 2023

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Homoleptic complex from the following complexes is:

A. Potassium trioxalatoaluminate(III) — K₃[Al(C₂O₄)₃] B. Diamminechloridonitrito-N-platinum(II) C. Pentaamminecarbonatocobalt(III) chloride D. Triamminetriaquachromium(III) chloride

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Explanation

Homoleptic = all ligands identical. Only (A) contains a single ligand type (oxalate).

NEET 2023

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A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is $A_x B_y$, then the value of $x + y$ is:

A. 5 B. 4 C. 3 D. 2

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Explanation

In ccp, atoms = 4; tetrahedral voids = 8. A fills $8/3$. Ratio A:B $= 8/3 : 4 = 2:3$, so formula $A_2B_3$, $x+y=5$.

NEET 2023

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The right option for the mass of CO₂ produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40):

$$\text{CaCO}_3 \xrightarrow{1200\,\text{K}} \text{CaO} + \text{CO}_2$$

A. 1.12 g B. 1.76 g C. 2.64 g D. 1.32 g

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Explanation

Pure CaCO₃ = 4 g $\Rightarrow$ moles = 0.04. CO₂ mass = $0.04 \times 44 = 1.76\ \text{g}$.

NEET 2023

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Taking stability as the factor, which one of the following represents correct relationship?

A. $\text{TlCl}_3 > \text{TlCl}$ B. $\text{InI}_3 > \text{InI}$ C. $\text{AlCl} > \text{AlCl}_3$ D. $\text{TlI} > \text{TlI}_3$

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Explanation

Inert pair effect: for Tl, +1 state is more stable than +3 → TlI more stable than TlI₃.

NEET 2023

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Identify product (A) in the following reaction:

$$\xrightarrow[\text{conc. HCl}]{\text{Zn-Hg}}\ (A) + 2\,\text{H}_2\text{O}$$

A.
both –COCH₃ → –CH₂CH₃ B.
both → –CH(OH)CH₃ C.
both → –CH₂OH D.
both → –CH₃

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Explanation

Clemmensen (Zn-Hg/HCl) reduces C=O of ketones completely to CH₂. Each –COCH₃ becomes –CH₂CH₃ (ethyl).

NEET 2023

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Select the correct statements:

A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is $9.10939 \times 10^{-31}$ kg. C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.

A. A, B and C only B. C, D and E only C. A and E only D. B, C and E only

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Explanation

A wrong (3 particles: p, n, e). D wrong (nucleons = p + n, not p + e). B, C, E correct.

NEET 2023

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For a certain reaction, the rate $= k[A]^2[B]$. When the initial concentration of A is tripled keeping concentration of B constant, the initial rate would:

A. decrease by a factor of nine. B. increase by a factor of six. C. increase by a factor of nine. D. increase by a factor of three.

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Explanation

Rate $\propto [A]^2$; tripling A $\Rightarrow$ rate $\times 3^2 = 9$.

NEET 2023

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Given below are two statements:

Statement I: A unit formed by the attachment of a base to 1'-position of sugar is known as nucleoside.

Statement II: When nucleoside is linked to phosphorus acid at 5'-position of sugar moiety, we get nucleotide.

Choose the correct answer:

A. Both Statement I and Statement II are true. B. Both Statement I and Statement II are false. C. Statement I is true but Statement II is false. D. Statement I is false but Statement II is true.

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Explanation

Standard definitions of nucleoside (base + sugar) and nucleotide (nucleoside + phosphate at 5′).

NEET 2023

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Amongst the given options which of the following molecules/ions acts as a Lewis acid?

A. NH₃ B. H₂O C. BF₃ D. OH⁻

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Explanation

BF₃ has incomplete octet around B and accepts an electron pair.

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