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Chemistry
CuS is dissolved in dil. HNO3. Balanced equation with correct products is
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Q. CuS is dissolved in dil. $HNO_{3}$. Balanced equation with correct products is
Redox Reactions
A
$CuS + 2H^{+} + 3NO^{-}_{3} \to Cu(NO_{3})_{2} + H_{2}S + H_{2}O + NO_{2}$
0%
B
$3CuS + 8H^{+}+ 8NO^{-}_{3} \to 3Cu(NO_{3}) _{2} + 3S + 4H_{2}O + 2NO$
86%
C
$CuS + 4NO^{-}_{3} \to Cu(NO_{3})_{2} + H_{2}S + H_{2}O$
5%
D
None of the above in correct
10%
Solution:
CuS (black ppt.) on boiling with $HNO_{3}$ results in the formation of colloidal S and blue coloured solution of $Cu(NO_{3})_{2}$.