Question

Colour of CuO is
A. Black
B. Blue
C. Green
D. Red

Answer 1

Hint: In order to answer the question , we need to have a detailed idea about the structure of CuO. We should also be familiar with the physical and chemical properties of CuO.

Complete step-by-step answer:
Let us have a look into the structure of CuO.
 The red structures are the Copper atoms and the green structures are the oxygen atoms.
The atomic number of copper is 29. And that of oxygen is 8.
So the electronic configurations of both the elements are given below:



The main factor to occur the colour of the compounds of d block, is having the d orbitals with an incomplete electron filling in the middle atom.
There is an inequality of energy, among those d orbitals. Therefore d-d electrons exchange among those orbitals by absorbing energy. The amount of energy consumption causes the colour of the compound. Here, different amounts of energy need to exchange different numbers of electrons. Thereby the wavelengths absorbed in the process changes, and consequently different colours occur.
The colour of CuO is known to be Black. So the correct option is Option A.

Note: We should be knowing the few uses of CuO. So here are some uses of CuO listed below:
Used in the welding process along with various copper alloys.
Used as a precursor in various copper containing products like wood preservatives and ceramics.
Some properties of CuO are:
Super Thermal Conductivity.
CuO shows photovoltaic properties.
It has high stability and high antimicrobial activity.