KCET2014ChemistryStructure of Atom
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?
Options
- A( Zn ²⁺, Al ³⁺ )
- B( A l³⁺, C u²⁺ )
- C( Pb ²⁺, Cu ²⁺ )
- D( C u²⁺, Z n²⁺ )
Correct answer
A. ( Zn ²⁺, Al ³⁺ )
Step-by-step solution
Ion forms a coordination compound with both aqueous sodium hydroxide and ammonia and other ions forms coordination compound only with aqueous sodium hydroxide. Zinc forms ( Na ₂ [ Zn ( OH )₄ ] ) coordination compound with ( NaOH ) ( Z n+2 N a O H(a q) N a₂ [Z n(O H)₄ ] ) Zinc forms a colorless tetraammine with the formula ( [Z n (N H₃ )₄ ]²⁺ ) ( Z n+4 N H₃(a q) [Z n (N H₃ )₄ ]²⁺ ) Aluminum forms complex with only aqueous sodium hydroxide ( N a₃ [ Al ( OH )₆ ] ) and not with ammonia. ( A l+3 N a O H(a q) N a₃ [A l(O