Select the coloured and paramagnetic ions.

C u^{+}, Z n^{2 +}, C a^{2 +}

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S c^{3 +}, T i^{4 +}, V^{5 +}

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C u^{2 +}, C r^{+}, M n^{2 +}

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N i^{2 +}, C u^{+}, H g^{2 +}

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Solution

The correct option is C $C u^{2 +}, C r^{+}, M n^{2 +}$
Ion is coloured if there are electrons in d-suborbit. Paramagnetic nature is also due to unpaired electrons. Thus, every coloured ion is also paramagnetic.
$C u^{2 +} = [A r] 3 d^{9}$ , one unpaired electron in $3$ d.
$C r^{+} = [A r] 3 d^{5}$ , five unpaired electrons in $3$ d.
$M n^{2 +} = [A r] 3 d^{5}$ five unpaired electrons in $3 d$ .

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C u^{+}, F e^{2 +}, M n^{2 +}, C r^{3 +}, S c^{3 +}, T i^{4 +}

C u^{+}, F e^{2 +}, M n^{2 +}, C r^{3 +}, S c^{3 +}, T i^{4 +}

Which of the following sets contain only isoelectronic ions?
(i) $Z n^{2 +}, C a^{2 +}, G a^{3 +}, A l^{3 +}$

(ii) $K^{+}, C a^{2 +}, S c^{3 +}, C l^{-}$

(iii) $P^{3 -}, S^{2 -}, C l^{-}, K^{+}$

(iv) $T i^{4 +}, A r, C r^{3 +}, v^{5 +}$

T i^{3 +}, V^{3 +}

C u^{+}, S c^{3 +}

F e^{2 +}, F e^{3 +}

C o^{2} +, N i^{2 +}

Z n^{2 +}, A g^{+}

M n^{2 +}, N i^{2 +}, C u^{2 +}

H g^{2 +}

H_{2} S

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