Assertion :Phosphates give a yellow crystalline precipitate upon addition of nitric acid and ammonium molybdate. Reason: Phosphates shows no change with $H_{2} S O_{4}$

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
When a small amount of the sample of $p h o s p h a t e$ is acidified with concentrated nitric acid, to which a little $a m m o n i u m$ molybdate is added. The presence of $p h o s p h a t e$ ions is indicated by the formation of a bright yellow precipitate layer of $a m m o n i u m$ $p h o s p h o m b d a t e .$
The appearance of the precipitated can be facilated by gentle heating.
This test is also used to detect arsenic, a yellow precipitate being formed.
$P h o s p h a t e s$ show no change with $H_{2} S O_{4},$ instead they react with $H N O_{3} .$

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Assertion :Phosphates give a yellow crystalline precipitate upon addition of nitric acid and ammonium molybdate. Reason: Phosphates shows no change with H2SO4

Assertion :Phosphates give a yellow crystalline precipitate upon addition of nitric acid and ammonium molybdate. Reason: Phosphates shows no change with $H_{2} S O_{4}$