Question

A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’. What changes you observe when hydrogen is passed through a tube containing this compound . Write relevant equations.

Answer 1

Explanation:

Given -

• A shiny brown-coloured element ‘X’ on heating in air becomes black in colour.

To Find -

1. Name the element X
2. What changes you observe when hydrogen is passed through a tube containing this compound.

Now,

As we know that :-

The Copper(Cu) is brown coloured element and on heating in air it forms Copper oxide (CuO) which is black in colour.

Chemical equation :-

2Cu + O2 → 2CuO

When hydrogen is passed through the tube containing Copper oxide (CuO) then again it forms Copper (Cu) and water is realesed.

Chemical equation :-

CuO + H2 → Cu + H2O

Hence,

Element X is Copper(Cu).

Answer 2

copper is a brown coloured element, which on heating in air forms black oxide. so, name of the element is copper (cu) .

Name of the black compound is Copper(ll) oxide ,(cuo)

Reaction: 2Cu(s) + O²(g) ------ 2CuO(s) copper (brown) ( from air) (copper oxide )

hope this will help you .

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