Assertion: The basicity of orthophosphorous acid is two.
Reason: In ortho-phosphorous acids, two replaceable hydrogen atoms are present.

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

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

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Assertion is true and Reason is false

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Assertion is false but Reason is true

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In an acid the number of hydrogen atoms which can be repalced by a base is called basicity of the acid.
The structure of orthophosphorus acid is given above.
It contains two -OH group from which hydrogen can be removed. Hence its basicity us two.
Note - (-H) do not contribute to basicity because it can't be removed.

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Read the assertion and reason carefully to mark the correct option out of the options given below :

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(d) If the assertion and reason both are false.

(e) If assertion is false but reason is true.

Assertion: Acetic acid does not undergo haloform reaction.

Reason: Acetic acid has no alpha hydrogens.

(a)

(b)

(c)

(d)

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