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By means of chemical equations express the following chemical reactions: 

(a) [Cr(H2O)6]Cl3 dissolved in water, is mixed with an excess of sodium hydroxide solution. A clear green solution is formed. The colour of the solution changes to yellow when an aqueous hydrogen peroxide solution is added. 

(b) If an aqueous solution of a violet manganese compound is mixed with a hydrogen peroxide solution, the resulting solution is decolourised and a gas is released from it. 

1 Answer

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(a) [Cr(H2O)6]3+ 4OH [Cr(OH)4(H2O)2] + 4H2

2[Cr(OH)4(H2O)2] + 3H2O2 + 2OH → 2 CrO2-4+12H2

(b) Equation is given in 2a. 

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