Qualitative Analysis - Result Question 68
####71. Write the balanced chemical equations for the following
(i) Silver chloride is treated with aqueous sodium cyanide and the product thus formed is allowed to react with zinc in alkaline medium.
(ii) Cobalt (II) solution reacts with $KNO _2$ in acetic acid medium.
(1989, 2M)
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Solution:
- (i) $AgCl+2 NaCN \longrightarrow NaCl+Na\left[Ag(CN) _2\right]$
$2 Na\left[Ag(CN) _2\right]+Zn \longrightarrow Na _2\left[Zn(CN) _4\right]+2 Ag$
(ii) $Co^{2+}+3 KNO _3+4 NO _2^{-}+2 H^{+} \longrightarrow K _3\left[Co\left(NO _2\right) _6\right]$
$$ +H _2 O+NO $$
