Tag: distinguish between black copper oxide and black manganese dioxide

Questions Related to distinguish between black copper oxide and black manganese dioxide

Write the ionic equation for reaction between manganese dioxide and hydrochloric acid.

distinguish between black copper oxide and black manganese dioxide practical work chemistry

  1. $MnO _2(s)+ 2Cl^{-}(aq) \rightarrow Mn^{2+}(aq) + Cl _2(g) + 2H _2O(l)$

  2. $MnO _2{(s)} + 4H^{+}{(aq)} + 2Cl^{-}{(aq)} \rightarrow Mn^{2+}{(aq)} + Cl _2{(g)} + 2H _2O{(l)}$

  3. $MnO _2{(s)} + 3H^{+}{(aq)} + 2Cl^{-}{(aq)} \rightarrow Mn^{2+}{(aq)} + Cl _2{(g)} + 2H _2O{(l)}$

  4. $MnO _2{(s)} + 4H^{+}{(aq)} + 2Cl^{-}{(aq)} \rightarrow Mn^{2+}{(aq)} + Cl{(g)} + 2H _2O({l})$

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Correct Option: B
Explanation:

$MnO _2{(s)} + 4H^{+}{(aq)} + 2Cl^{-}{(aq)} \rightarrow Mn^{2+}{(aq)} + Cl _2{(g)} + 2H _2O{(l)}$

The salt formed on reaction of copper oxide with hydrochloric acid is :

distinguish between black copper oxide and black manganese dioxide practical work chemistry

  1. Cuprous chloride

  2. Cupric chloride

  3. Both formed in $1:2$ ratio

  4. Both formed in $1:3$ ratio

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Correct Option: B
Explanation:

copper oxide $+$ hydrochloric acid $\rightarrow $ copper chloride $+$ water

 $CuO+2HCl \rightarrow  CuCl _{2}+H _{2}O$