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The p-Block Elements
Question
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What happens when
H3PO3 is heated?

Answer

Phosphorous acid H3PO3, on heating, undergoes disproportionation reaction to form Phosphine (PH3) and Phosphoric acid (H3PO4)
4H3PO3 +heat → 3H3PO4 +PH3

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Some More Questions From The p-Block Elements Chapter

Why are pentahalides more covalent than trihalides?

Why is BiH3 the strongest reducing agent amongst all the hydrides of Group 15 elements?

Why is N2 less reactive at room temperature?

Mention the conditions required to maximise the yield of ammonia.

What is the covalency of nitrogen in N2O5?

Bond angle in PH4+ is higher than that in PH3. Why?

Write a balanced equation for the hydrolytic reactions PCl5 in heavy water.