Question

# Which of the following compound is expected to be coloured?

A
Ag2SO4
B
CuF2
C
MgF2
D
CuCl

Solution

## The correct option is C $$CuF_2$$ $$Ag_2SO_4$$ contain $$Ag^+$$ ion having outer electronic configuration of $$4d^{10}$$ with 0 unpaired electrons and is colourless. $$CuF_2$$ contains $$Cu^{2+}$$ ion  having outer electronic configuration of $$3d^9$$ with 1 unpaired electron and is coloured.$$MgF_2$$ contains $$Mg^{2+}$$  with 0 unpaired electrons having outer electronic configuration of $$3s^2$$ and is colourless.$$CuCl$$ contains $$Cu^+$$  ion having outer electronic configuration of $$3d^{10}$$ with 0 unpaired electrons and is colourless.Hence, option $$B$$ is correct.Chemistry

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