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. 'C' is

Answer»

`B_(2)O_(3)`
`H_(3)BO_(3)`
`P_(2)O_(5)`
`SiO_(2)`

Solution :`BN+ H_(2)O to underset("(White powder)")(H_(3)BO_(3)) + underset('D')(NH_(3) (g))`
[truns RED litmus BLUE because it is basic in NATURE]


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