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Question

Which of the following compound is expected to be coloured?


A
Ag2SO4
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B
CuF2
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C
MgF2
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D
CuCl
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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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