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When hydrogen is passed over a black sol...

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, to the other.
What happens to substance A when it reacts with hydrogen ? Give reasons for your answer.

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Black copper oxide (A) on heating with hydrogen reduces copper oxide to reddish-brown copper, and itself gets oxidised to water.
Hydrogen is a strong reducing agent and it removes oxygen from heated metal oxides when passed over them and itself gets oxidised to water.
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ICSE-STUDY OF THE FIRST ELEMENT - HYDROGEN-TOPIC 2 Properties of Hydrogen, Oxidation nd Reduction (5 MARKS QUESTIONS)
  1. Name : an oxidizing agent that does not contain oxygen.

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  2. Name a substance which oxidises conc. hydrochloric acid to chlorine.

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  3. Name a substance that will reduce aqueous Iron (III) ions to Iron (II...

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  4. Name : a liquid that is an oxidizing as well as a reducing agent.

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  5. Give one example of each A gaseous substance which acts as an oxidis...

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  6. Why are the following metals not used in the lab. Preparation of hydro...

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  7. Why are the following metals not used in the lab. Preparation of hydro...

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  8. Why are the following metals not used in the lab. Preparation of hydro...

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  9. Why are the following metals not used in the lab. Preparation of hydro...

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  10. How did the name 'hydrogen' originate?

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  11. What happens when following elements are made to react with hydrogen. ...

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  12. What happens when following elements are made to react with hydrogen. ...

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  13. What happens when following elements are made to react with hydrogen. ...

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  14. What happens when following elements are made to react with hydrogen. ...

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  15. State the product formed and write the balanced equation to show the r...

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  16. When hydrogen is passed over a black solid compound A, the products ar...

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  17. When hydrogen is passed over a black solid compound A, the products a...

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  18. When hydrogen is passed over a black solid compound A, the products ar...

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  19. When hydrogen is passed over a black solid compound A, the products ar...

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  20. When hydrogen is passed over a black solid compound A, the products a...

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