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Chemistry NEET Questions — Free MCQ Practice

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Which of the following is the correct statement?

A.

F₂ has higher dissociation energy than Cl₂

B.

F has higher electron affinity than Cl

C.

HF is stronger acid than HCl

D.

Boiling point increases down the group in halogens

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Explanation

-Bond dissociation energy of F₂ is less than that of Cl₂

-Cl has higher E.A. than fluorine

-HF is weaker acid than HCl, due to higher bond energy

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Among the following compounds, which on heating do not produce N₂?

A.

(NH₄)₂Cr₂O₇

B.

NH₄Cl+NaNO₂

C.

NH₄Cl+CaO

D.

Ba(N₃)₂

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Explanation

(c) NH₄Cl+ NaNO₂→NH₄NO₂+NaCl
NH₄NO₂ $\overset{∆}{\to}$ N₂↑ +2H₂O

Ba(N₃)₂ →Ba+3N₂↓
2NH₄Cl+CaO→CaCl₂+2NH₃↑+H₂O)

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In which process does the nitrogen undergo oxidation?

A.

N₂ ^_$\to$2NH₃

B.

N₂O₄ ^_$\to$2NO₂

C.

NO3^- _$\to$N₂O₅

D.

NO₂^{- _$\to$}NO₃^-

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Explanation

$\overset{+ 3}{N} O_{2}^{-} \overset{Oxidation}{\to} \overset{+ 5}{N} O_{3}^{-}$

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B(OH)₃+ NaOH $\to$ NaBO₂+ Na[B(OH)₄] +H₂O

How can this reaction is made to proceed in forward direction?

A.

addition of cis 1,2 diol

B.

addition of borax

C.

addition of trans 1,2 diol

D.

addition of Na₂HPO₄

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Explanation

(a) H₃BO₃ acts as weak monobasic Lewis acid.

(i) B(OH)₃+ NaOH $\to$ Na[B(OH)₄]

on addition of cis 1,2 diol in H3bo3 solution, acidic strength of H₃BO₃ increases due to chelation effect.

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Which of the following has been arranged in order of decreasing bond dissociation energy:

A.

P-O>Cl-O>S-O

B.

P-O>S-O>Cl-O

C.

S-O>Cl-O>P-O

D.

Cl-O>S-O>P-O

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Explanation

Bond dissociation energy $\propto \frac{1}{Bond Length}$

Order of bond length: P-O > S-O >Cl- O Order of BDE: Cl-O> S-O>P-O

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When PCl₃ is hydrolysed then oxyacid of phosphrous is obtained.The basicity of oxyacid is

A.

one

B.

two

C.

three

D.

four

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Explanation

$(2) {PCl}_{3} + 3 H_{2} O \to H_{3} {PO}_{3} + 3 HCl H_{3} {PO}_{3} is a diabasic acid .$

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Which set of oxide of nitrogen is paramagnetic in nature?

A.

NO, N₂O

B.

NO₂, NO, N₂O

C.

NO,NO₂

D.

N₂O,NO₂

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Explanation

NO and NO₂are paramagnetic in nature

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Which is incorrectly given according to the order indicated?

A.

F₂>Cl₂>Br₂>I (Oxidizing power)

B.

HI>HBr>HCl>HF (Acidic Strength)

C.

F₂>Cl₂>Br₂>I₂ (Bond Energy)

D.

HF>HI>HBr>HCl (Boiling point)

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Explanation

The bond energy of F₂is less than Br₂due to interelectronic repulsion

Cl₂>Br₂>F₂>I₂

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Bleaching action of SO₂ is due to its

A.

acidic property

B.

basic property

C.

reducing property

D.

oxidising property

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Explanation

Bleaching action of: Bleaching by sulphur dioxide is due to the process of reduction in the presence of moisture.
$S O_{2} + 2 H_{2} O \to H_{2} S O_{4} + 2 [H]$ (nascent)

The nascent hydrogen liberated in the reaction is responsible for bleaching flower but when the flower comes in contact with air.

It get oxidized and be come coloured.

Colour material $+ [H] \to$ Colourless $a i r$ Colour

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The correct order of acidic strength of oxyacid of phosphorous is

A.

H₃PO₂> H₃PO₃>H₃PO₄

B.

H₃PO₄> H₃PO₃>H₃PO₂

C.

H₃PO₃>H₃PO₂>H₃PO₄

D.

H₃PO₂>H₃PO₄> H₃PO₃>

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Explanation

Acidity is directly proportional to free oxygen and inversely proportional to -OH group.

The double bonded oxygen has negative inductive effect (-I). And this electron withdrawing effect is experienced by one $H$ of the one $- O H$ group in $H_{3} P O_{2}$ . Hence it has greatest acidic strength.

Similarly, the -I effect of $O$ is experienced by two $H$ of the two $- O H$ groups in $H_{3} P O_{3}$ , hence electron withdrawing effect is reduced because it is getting distributed between two groups. Hence, it has lesser acidic strength. Similarly, in $H_{3} P O_{4}$ , it is distributed between 3 groups and so the acidic strength is least.

Chemistry MCQs for NEET — Practice Questions with Answers

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