The co-ordination number of copper in cuprammoniumsulphate is
2
6
4
-4
                
                  As we have learned
Coordination number -
No. of ligands which are bounded directly to metal
- wherein
eg: 
Coordination No. 
eg:  
Coordination No. 
en is bidentate
In Cuprammoniumsulphate
co-ordination no. of Cu is 4.
Option 1)
2
Option 2)
6
Option 3)
4
Option 4)
-4
Study 40% syllabus and score up to 100% marks in JEE