1.

A' on heating at 700^(@)C in air gives a white infusible amorphous powder (B) which is decomposed when heated in the currect of steam to give white powder 'C' and a gas 'D'.'D' turns red litmus blue and in aqueous solution , gives reddish brown ppt with K_(2)HgI_(4). compound 'C on strong heating gives 'E. 'E' is

Answer»

`B_(2)O_(3)`
`SiO_(2)`
`NH_(3)`
`N_(2)O`

Solution :`underset('C')(2H_(3)BO_(3))overset("heat")underset("strongly")to underset('E')(B_(2)O_(3)) + 3H_(2)O`


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