Question

X a brown coloured shining element with atomic number one unit grater than Ni when burnt air,turn black.what is'X'? what is the black coloured substance?

Answer 1

X is copper and black coloured substance is carbon

Answer 2

Answer: The element X is copper and the black colored substance is copper oxide.

Explanation:

Nickel is the 28th element of the periodic table. So, the element having atomic number 29 is copper.

When copper is burned in air, it reacts with oxygen present there and forms a black colored compound known as copper oxide.

The equation for the formation of copper oxide from copper and oxygen follows:

$2Cu+O_2\rightarrow 2CuO$

Hence, the element X is copper and the black colored substance is copper oxide.