1.

In a mixture having nitrite and nitrate , nitrate , nitrite can be destroyed by heating with H_2 SO_4 and

Answer»

`Na_2 CO_3`
UREA
oxalic acid
NaCl

Solution :`2 NaNO_2 + H_2 SO_4 to Na_2 SO_4 + 2 HNO_2NH_(2) UNDERSET("urea")(CON) H_(2) + 2 HNO_(2) overset(Delta)(to) 3 H_(2) O + CO_(2) UARR +2 N_(2) uarr`


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