Name the gas evolved when concentrated HCI is added to powdered potassium dichromate. On passing the evolved gas through acidified KBr solution, the solution turns brown. Write the balanced equations for the reactions involved.

Explanation

To solve the problem step by step, we will identify the gas evolved when concentrated hydrochloric acid (HCl) is added to powdered potassium dichromate (K2Cr2O7), and then write the balanced chemical equations for the reactions involved.

### Step 1: Identify the gas evolved
When concentrated hydrochloric acid is added to powdered potassium dichromate, the gas evolved is chlorine gas (Cl2).

**Hint:** Remember that potassium dichromate is a strong oxidizing agent and reacts with hydrochloric acid to release chlorine gas.

### Step 2: Write the balanced chemical equation for the reaction
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