When hydrogen is passed over a black solid compound A, the products are .a colourless liquid. and .a reddish brown metal B..
Substance B is divided into two parts, each placed in separate test tubes.
Dilute HCl is added to one part of substance B and dilute `HNO_3` to the other.
Is there any reaction between substance B and dilute hydrochloric acid ? Give reasons for your answer.

Explanation

To solve the question, we need to analyze the reactions and properties of the substances involved.

### Step-by-Step Solution:

1. **Identify the Black Solid Compound (A)**:
- When hydrogen gas is passed over a black solid compound A, it produces a colorless liquid and a reddish-brown metal B.
- The black solid compound is likely copper(II) oxide (CuO), which reacts with hydrogen to produce copper (Cu) and water (H2O).

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