When hydrogen is passed over a black solid compound A, the products are 'a colorless 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 $H N O_{3}$ to the other.
Name the substances A and B.

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Solution

The black-coloured solid (A) compound is oxide of copper which on reaction with hydrogen reduces to copper which is a reddish-brown metal (B) along with the formation of water which is a colourless liquid.

Compound A : Copper oxide (CuO)
Metal B : Copper
Colourless liquid : Water $H_{2} O$

The reaction is,
$C u O + H_{2} \to C u + H_{2} O$

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Similar questions

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 seperate test tubes.

Dilute HCI is added to one part of substance B and dilute $H N O_{3}$ to the other.

(a) Name the substances A and B.

(b) Give two tests for the colourless liquid formed in the experiment.

(d) Write an equation for the reaction between hydrogen and substance A.

(e) Is there any reaction between substance B and silute hydrochloric acid ? Give reasons for your answer.

H N O_{3}

H N O_{3}

H N O_{3}

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