Assertion: Borax forms alkaline aqueous solution.
Reason: Borax is the salt of a weak acid( $H_{3} B O_{3}$ ) and a strong base (NaOH).

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

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

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Assertion is correct but Reason is not correct

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Assertion is not correct but Reason is correct

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Both Assertion and Reason are not correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
For a aqueous solution of salt of weak acid and strong base.
$p H = 7 + 0.5 p K_{a} + 0.5 l o g c$
Hence, pH will always grater than 7 and the solution will be basic.
Borax is the salt of a weak acid $(H_{3} B O_{3})$ and a strong base (NaOH).
Hence, borax forms alkaline aqueous solution.

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Assertion: Borax forms alkaline aqueous solution.Reason: Borax is the salt of a weak acid(H3BO3) and a strong base (NaOH).

Assertion: Borax forms alkaline aqueous solution.
Reason: Borax is the salt of a weak acid( $H_{3} B O_{3}$ ) and a strong base (NaOH).