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An element occupies group number 1 and p...

An element occupies group number 1 and period number 3. This element when exposed to air gives compound (A). The element with water forms compound (B). Which is a strong base und (A) with ammonia gives compound (C ) which is used as reducing agent in organic chemistry. The element reacts with an halogen and forms cooking salt (D). Identify A, B, C and D.

A

`SO_4`

B

`NO_2`

C

`P_2 O_3`

D

`SO_3`

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