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Solution


Q.

Which of the following is an example of double salt
1 [Rh(PPh3)3Cl] (Wilkinson's catalyst)  
2 [Fe(H2O)5NO]SO4 (Brown ring complex)  
3 FeSO4(NH4)2SO4·6H2O (Mohr's salt)  
4 NaOH (caustic soda)  

Ans.

(3)

FeSO4(NH4)2SO4.6H2O (Mohr's salt)