Question

The colour of copper hydroxide is:
A) Black
B) Blue
C) Green
D) Red

Answer 1

Hint: The copper hydroxide is widely used in a chemical laboratory as a liquid reagent. One can use their practical session knowledge or memory to determine the colour of the copper hydroxide among the given questions.

Complete step by step answer:
1) First of all we will learn about the copper hydroxide chemical. The chemical Copper hydroxide is the hydroxide of copper which has the chemical formulas as $Cu{(OH)_2}$.
2) The copper hydroxide is a weak base and used as a reagent in many chemical reactions.
3) The copper hydroxide production is done by reacting the sodium hydroxide chemical to a dilute solution of the copper sulfate solution.
4) The copper hydroxide solution is a pale greenish-blue or bluish-green in colour which is generally taken as blue colour. Hence, the copper hydroxide shows the blue colour.

Hence, option B is the correct answer.

Additional information: The copper hydroxide was widely produced on an industrial scale during the time period of ${\text{1}}{{\text{7}}^{th}}$ and ${\text{1}}{{\text{8}}^{th}}$ centuries which was used in the pigments such as blue verditer and Bremen green pigment. These were the pigments that were used in ceramics and painting. The structure of copper hydroxide can be determined by using the X-ray crystallography method. The copper which is in the center has a square pyramidal shape. The hydroxide group ligands present in the plane of the structure are doubly bridging or triply bridging.

Note:
The copper hydroxide i.e. $Cu{(OH)_2}$ has a very specialized role in organic chemistry and is a weak type of base. The copper hydroxide is used in the synthesis of aryl amines which is widely used in chemical industrial processes.