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Standard X

Chemistry

Reaction of Metals with Acid

When hydrogen...

Question

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 $H C l$ is added to one part of substance $B$ and dilute $H N O_{3}$ to the other. What happens to substance $A$ when it reacts with hydrogen ? Give reasons for your answer.

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Solution

Compound A is black copper(II) oxide and B is copper, dark brown metal.
$C u O + H_{2} \to C u + H_{2} O$
Metals which have more electrons in the outer ring of their atoms such as copper can absorb high quantities of hydrogen without changing chemically. Hydrogen seeps in the metals' structure.

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Compound A is black copper(II) oxide and B is copper, dark brown metal.CuO+H2→Cu+H2OMetals which have more electrons in the outer ring of their atoms such as copper can absorb high quantities of hydrogen without changing chemically. Hydrogen seeps in the metals' structure.

Compound A is black copper(II) oxide and B is copper, dark brown metal.
$C u O + H_{2} \to C u + H_{2} O$
Metals which have more electrons in the outer ring of their atoms such as copper can absorb high quantities of hydrogen without changing chemically. Hydrogen seeps in the metals' structure.