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Byju's Answer

Standard XII

Chemistry

Reaction with Metals

Assertion :Bo...

Question

Assertion :Boron reacts with $H N O_{3}$ . Reason: Boron reacts with all acids.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$B + H C I \to$ No reaction

$B + H_{2} S O_{4} d i l \to$ No reaction.

$2 B + 3 H_{2} S O_{4} c o n c . \to 2 H_{3} B O_{3} + 3 S O_{2}$

$B + 3 H N O_{3} \to H_{3} B O_{3} + 3 N O_{2}$

Thus, Assertion is correct but Reason is incorrect

Hence, the correct option is $C$

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Similar questions

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(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: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

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Assertion :Boron reacts with HNO3. Reason: Boron reacts with all acids.

The correct option is C Assertion is correct but Reason is incorrectB+HCI→ No reactionB+H2SO4dil→ No reaction.2B+3H2SO4conc.→2H3BO3+3SO2B+3HNO3→H3BO3+3NO2Thus, Assertion is correct but Reason is incorrectHence, the correct option is C

Assertion :Boron reacts with $H N O_{3}$ . Reason: Boron reacts with all acids.