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Chemistry MCQs for NEET — Practice Questions with Answers

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The silver sulphate solution is used to separate:

nitrate and bromide

nitrate and chlorate

bromide and iodide

nitrate and nitrite

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Explanation

AgBr is insoluble; AgNO₃ is soluble.

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Soda extract is prepared by:

fusing soda and mixture and, then extracted with water

dissolving NaHCO₃ and mixture in dil. HCl

boiling Na₂CO₃ and mixture in dil.HCl

boiling Na₂CO₃ and mixture in distilled water

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Explanation

(d) It is the process to prepare soda extract.

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The compound which forms one monochloro product when treated with chlorine is:

n-pentane

isopentane

neo-pentane

none of these

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Explanation

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The electromeric effect in organic compounds is a

temporary effect

permanent effect

temporary-permanent effect

none of the above

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Which of the following contains only three pairs of electrons?

Carbocation

Carbanion

Free radical

None of these

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Electrophiles are:

electron loving species

electron hating species

nucleus loving reagents

nucleus hating reagents

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Explanation

(a) Electrophiles are electron deficient species which can share lone pair of electron with carbonion and are thus, called Lewis acids.

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Nucleophiles are:

electron loving

electron hating

nucleus loving

nucleus hating

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Explanation

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The sigma bond energy of C-H bond in C₂H₆ is:

99 kcal

140 kcal

200 kcal

60 kcal

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Explanation

(a)

Sigma bond is the first bond formed between any two atoms. ... The C−H bond energy in C2H6 is 99 kcal or 413 KJ/mol

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Which of the following is strongest nucleophile?

Br^-

$\overset{. .}{O} H$

$\overset{. .}{C} N$

$C_{2} H_{5} \overset{. .}{O}$

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Explanation

(d) The order of nucleophilicity depends upon the nature of alkyl group ‘ R' on which a nucleophile to attack as well as on nature of solvent. However, if these are same, then weaker is acid, stronger is base, i.e., stronger is nucleophilicity. This acidic character is:

HI > HBr > HCI > HCN > H₂O > EtOH

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In hyperconjugation, the atom involved is:

Î²Î— atom

Î±-H atom

Î³-H atom

all of these

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Explanation

In hyperconjugation, the stabilization of a molecule or ion is achieved by the delocalization of electrons from an adjacent C-H Ïƒ bond into an empty or partially filled p-orbital. Therefore, the Î±-H atom is involved in hyperconjugation.

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