1. Ca(HCO3)2
2.Ca(HCOO)2
3. Ca(OH)2
4.NaOH
5.KCI
6.MgSO4
7.PbO
8.HCl
9.HNO3
10.H2SO4
11.NH3
12.(NH4)3PO4
13.NaOH
:)
It would be an physical change ; if you melt butter the butter goes from a solid to a liquid so therefore the physical state is changed.
Because H is a non-metal, it has the highest electronegativity. Option (1) H is correct.
Hope this would help~