Question

• Which among the following
species will be colorless
Answer
A. A. Cu(+)
B. B. Cu(2+)
c. C. Cr(3)
D.D. Co(2)​

Answer 1

Answer:

cu + is colourless

ok ✌✌✌

Answer 2

Cu(+) is colorless. The copper species exhibit their color due to unpaired electrons in their d orbit but Cu(+) has completely filled orbits. That is why Cu(+) has no color.

To make it very clear, we must also know about other given chemical species.

• Cu(2+) produces blue color as it has partially filled orbits.
• Cr(3) is yellow in color. The word chromium derives from the Greek word 'chroma' meaning color. This is the reason all chromium species are colorful.
• Co(2)  exhibits pink color in solution but it is bluish when in dry state.