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Chemistry Question on coordination compounds

In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with both aqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide ?

A

Zn+2,Al+3Zn^{+2},Al^{+3}

B

Al+3,Cu+2Al^{+3} ,Cu^{+2}

C

Pb+2,Cu+2Pb^{+2},Cu^{+2}

D

Cu+2,Zn+2Cu^{+2},Zn^{+2}

Answer

Zn+2,Al+3Zn^{+2},Al^{+3}

Explanation

Solution

Zn2+,Al3+Zn ^{2+}, Al ^{3+}

(i) zn(OH)2+2NaOH⟶Na[Zn(OH)42−+2Na+zn(OH)_2 +2NaOH \longrightarrow Na[Zn(OH)_4^{2 -} + 2Na^ +

$\underset{\text{Anhydrous}}{ZnCl_2} + 4NH 3 \longrightarrow \underset{\text{Tetraamine

zinc chloride}}{Zn(NH_3)_4Cl_2}$

Al(OH)3+NaOH⟶[Al(OH)4]−Al ( OH )_{3}+ NaOH \longrightarrow\left[ Al ( OH )_{4}\right]^{-}
Al3++3NH3⟶Al(NH3)3Al ^{3+}+3 NH _{3} \longrightarrow Al \left( NH _{3}\right)_{3}