Concentrated `H_2 SO_4` is added to the test tubes containing (a) to (e).
`{:("Test tube",,"Compounds"),(a.,,"Cane sugar"),(b.,,"sodium bromide"),(c.,,"Copper turnings"),(d.,,"Sulphur powder"),(e.,,"Potassium chloride"):}`
Identify in which of the above test tubes, the following change will be observed on heating. Also give the chemical equations involved.
(i) Formation of black substance.
(ii) Evolution of brown gas.
(iii) Evolution of colourless gas.
(iv) Formation of brown substance, which on dilution becomes blue.
(v) Disappearance of yellow powder along with the evolution of a colourless gas.

Explanation

To solve the problem, we will analyze the reactions of concentrated sulfuric acid with each of the compounds in the test tubes (a) to (e) and identify the changes that occur, along with the corresponding chemical equations.

### Step-by-Step Solution:

**Test Tube (a): Cane Sugar (C₁₂H₂₂O₁₁)**

1. **Reaction**: Concentrated sulfuric acid acts as a dehydrating agent, removing water from cane sugar.
2. **Chemical Equation**:
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