Assertion : HNO3 oxides sulphur to H2SO4  acid ( S + VI) but only oxidizes selenium to H2SeO3 ( Se + IV ).

Reason : In Selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.

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#2 | 15th Group: Properties: II
#3 | 15th Group: Ammonia

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group 15 ,preparation and properties
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