Assertion: There is very little difference in acid strength of $H_{3} P O_{4}, H_{3} P O_{3}$ and $H_{3} P O_{2}$ .
Reason: The hydrogens in these acids are not all bonded to oxygens. The electronegativities of P and H are almost the same.

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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Assertion is incorrect but Reason is correct

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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
As hydrogens in these acids are not all bonded to oxygens, (image) so they have almost same acid strength.
Also, electronegativities of P and H are almost the same.

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