Assertion : $H_{3} B O_{3}$ in water behaves as monobasic acid Reason: The ionisation reaction is as follows:
$H_{3} B O_{3} + H_{2} O ⇌ B {(O H)}_{4}^{-} + H^{+}$

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Acid is a substance, which when dissolved in water, provides hydrogen ions.
When one molecule of $H_{3} B O_{3}$ is dissolved in water, it gives one hydrogen ion according to the following reaction.
$H_{3} B O_{3} + H_{2} O ⇌ B {(O H)}_{4}^{-} + H^{+}$
Hence, $H_{3} B O_{3}$ is monobasic acid.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :H3BO3 in water behaves as monobasic acid Reason: The ionisation reaction is as follows: H3BO3+H2O⇌B(OH)−4+H+

Assertion : $H_{3} B O_{3}$ in water behaves as monobasic acid Reason: The ionisation reaction is as follows:
$H_{3} B O_{3} + H_{2} O ⇌ B {(O H)}_{4}^{-} + H^{+}$