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Standard XII

Chemistry

Bronsted Lowry Theory

Assertion : ...

Question

Assertion : $H_{3} B O_{3}$ is monobasic Lewis acid but its salt $N a_{3} B O_{3}$ exist.
Reason : $H_{3} B O_{3}$ reacts with $N a O H$ to give $N a_{3} B O_{3}$

Assertion is correct but Reason is wrong.

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Assertion is wrong but Reason is correct.

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Both Assertion and Reason are correct and Reason is correct explanation of Assertion

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Both Assertion and Reason are correct but Reason is not correct explanation of Assertion

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Solution

The correct option is A Assertion is correct but Reason is wrong.
One molecule of $H_{3} B O_{3}$ can react with one molecule of base $N a O H$ to form one molecule of $N a B (O H)_{4}$ . Hence, $H_{3} B O_{3}$ is a monobasic acid.
$H_{3} B O_{3} + N a O H \to N a B (O H)_{4}$
$N a_{3} B O_{3}$ exists but it is not formed by the reaction of $H_{3} B O_{3}$ with $N a O H$ . However it is formed by the reaction of $H_{3} B O_{3}$ with ethanol followed by action of $N a O H$ .
$H_{3} B O_{3} + 3 C_{2} H_{5} O H \to (C_{2} H_{5})_{3} B O_{3} 3 N a O H - ------ \to - 3 C_{2} H_{5} O H N a_{3} B O_{3}$ .

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Similar questions

Q. Assertion :

H_{3} B O_{3}

is monobasic Lewis acid but salt

{N a}_{3} B O_{3}

exist. Reason:

H_{3} B O_{3}

reacts with

N a O H

to give

{N a}_{3} B O_{3}

Q. Assertion :

H_{3} B O_{3}

is monobasic Lewis acid but its salt

N a_{3} B O_{3}

exists. Reason:

H_{3} B O_{3}

reacts with

N a O H

to give

N a_{3} B O_{3}

in ethyl alcohol.

Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason (R) Lewis acid polarises the bromine molecule.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion : H3BO3 is monobasic Lewis acid but its salt Na3BO3 exist.Reason : H3BO3 reacts with NaOH to give Na3BO3

Assertion : $H_{3} B O_{3}$ is monobasic Lewis acid but its salt $N a_{3} B O_{3}$ exist.
Reason : $H_{3} B O_{3}$ reacts with $N a O H$ to give $N a_{3} B O_{3}$