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Aldehyde ketones & carboxylic Acid NEET Questions — Free MCQ Practice

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In manufacture of sodium carbonate from Solvay (or ammonia-soda) process the raw material used is :

A.

$NaOH$

B.

${Na}_{2} {SO}_{4}$

C.

$NaCl$

D.

$Na {HCO}_{3}$

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Explanation

(C)

${NH}_{3} + {CO}_{2} + H_{2} O \overset{}{\to} {NH}_{4} {HCO}_{3} NaCl + {NH}_{4} {HCO}_{3} \overset{}{\to} {NaHCO}_{3} + {NH}_{4} Cl 2 {NaHCO}_{3} \overset{150 ° C}{\to} {Na}_{2} {CO}_{3} + {CO}_{2} + H_{2} O 2 {NH}_{4} Cl + Ca {(OH)}_{2} \overset{}{\to} 2 {NH}_{3} + H_{2} O + {CaCl}_{2} (by product)$

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Which of the following reactions of potassium superoxide supply oxygen gas in the breathing equipments used in space and submarines?

A.

Reaction of superoxide with nitrogen in the exhaled air.

B.

Reaction of superoxide with moisture in the exhaled air.

C.

Reaction of superoxide with carbon dioxide in the exhaled air

(A) (1), (2) and (3)

(B) (2) and (3) only

(C) (2) only

D.

(1) and (2) only

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Explanation

(B)

(2) ${KO}_{2} + 2 H_{2} O \overset{}{\to} KOH + H_{2} O_{2} + \frac{1}{2} O_{2}$

(3) $4 {KO}_{2} + 2 {CO}_{2} \overset{}{\to} 2 K_{2} {CO}_{3} + 3 O_{2}$

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Which of the following acts as an oxidizing as well as a reducing agent?

A.

${Na}_{2} O$

B.

${NaO}_{3}$

C.

$NaNO$

D.

${NaNO}_{2}$

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Explanation

(D)

${NaNO}_{2}$ (sodium nitrite) acts both as an oxidizing agent and reducing agent because the nitrogen

atom in it is in +3 oxidation state (+3 intermediate oxidation state for nitrogen)

Oxidizing property : $2 {NaNO}_{2} + 2 Kl + 2 H_{2} {SO}_{4} \overset{}{\to} {NaSO}_{4} + K_{2} {SO}_{4} + 2 NO + 2 H_{2} O + l_{2}$

Reducing property : ${NaNO}_{2} + H_{2} O_{2} \overset{}{\to} {NaNO}_{3} + H_{2} O .$

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Alkaline earth metal nitrates on heating decompose to give:

A.

$M {({NO}_{2})}_{2} and O_{2} only$

B.

$MO, N_{2} and O_{2}$

C.

$MO, {NO}_{2} and O_{2}$

D.

$MO and {NO}_{2} only$

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Explanation

(C) $2 M {({NO}_{3})}_{2} \overset{∆}{\to} 2 MO + 4 {NO}_{2} + O_{2} (M = Be, Mg, Ca, Sr, Ba)$

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A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –

A.

$B e^{2 +}$

B.

$B a^{2 +}$

C.

$P b^{2 +}$

D.

$C a^{2 +}$

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Explanation

(A). $B e C l_{2}$ is hygroscopic and fumes in air due to hydrolysis. It is also covalent in nature due to small size and relatively high charge on $B e^{2 +}$ ion. Due to small size electrons in Be are tightly held by nuclear forces and they are not excited to higher energy levels. Thus Be does not give flame colouration.

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A hydrated water soluble salt, A in solution gives a turbidity with dilute hydrochloric acid evolving a gas with a suffocation odour. The solution of A decolourises lodine solution. A is likely to be

A.

KI

B.

$N a_{2} S O_{4} . 10 H_{2} O$

C.

$N a_{2} S_{2} O_{3} . 5 H_{2} O$

D.

$A g N O_{3}$

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Explanation

(C). The reactions are

$N a_{2} S_{2} O_{3} + 2 H C l \to 2 N a C l + S O_{2} ↑ + S ↓ + H_{2} O$

$2 N a_{2} S_{2} O_{3} + I_{2} \to 2 N a I + \underset{(S o d i u m t e t r a t h i o n a t e)}{N a_{2} S_{4} O_{6}}$

Sodium thiosulfate is an inorganic compound with the formula Naâ‚‚Sâ‚‚Oâ‚ƒxHâ‚‚O. Typically it is available as the white or colorless pentahydrate, Naâ‚‚Sâ‚‚Oâ‚ƒ·5Hâ‚‚O. The solid is an efflorescent crystalline substance that dissolves well in water.

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H₃BO₃ is

A.

monobasic and weak Lewis acid

B.

monobasic and weak bronsted acid

C.

monobasic and strong Lewis acid

D.

tribasic and weak Bronsted acid

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Explanation

H₃BO₃ is not a protonic acid. It can accept one OH^- and converted into [B(OH)₄]^-. So, it is a weak monobasic lewis acid.

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Addition of excess of sodium hydroxide solution to stannous chloride solution, gives:

A.

$S n {(O H)}_{2}$

B.

$S n O_{2} . H_{2} O$

C.

$N a_{2} S n O_{3}$

D.

$N a_{2} S n O_{2}$

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Lead pipes are corroded by:

A.

$H_{2} S O_{4}$

B.

HCl

C.

$C H_{3} C O O H$

D.

Pure water

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$Ph - {CO}_{2} H \overset{{SOCl}_{2}}{\to} A \overset{{Me}_{2} NH}{\to} B \overset{(c)}{\to} Ph - CHO$ , unknown reagent (c) is:

A.

LiALH₄

B.

NaBH₄

C.

LiAlH₄(t-BuO)₃

D.

PCC/CH₂CL₂

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Aldehyde ketones & carboxylic Acid MCQs for NEET — Chemistry Questions with Answers

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