Write balanced chemical equations for:
(i) Mixture of `K_(2)Cr_(2)O_(7)` and `NaCl` is heated with concentrated `H_(2)SO_(4)`.
(ii) Potassium permanganate is added to a hot solution of manganous sulphate.
(iii). Potassium dichromate and concentrated HCl are heated together.

Explanation

Let's break down the solution step by step for each of the reactions mentioned in the question.

### (i) Mixture of `K2Cr2O7` and `NaCl` is heated with concentrated `H2SO4`.

1. **Identify the reactants**: The reactants are potassium dichromate (`K2Cr2O7`), sodium chloride (`NaCl`), and concentrated sulfuric acid (`H2SO4`).
2. **Write the unbalanced equation**:
\[
K2Cr2O7 + NaCl + H2SO4 \rightarrow \text{Products}
...