Match the column I (molecules/ions) with column II (acid/base) and choose the correct option from the codes given below.
Codes
A-1 B -3 C-4 D-2
A-4 B-2 C-4 D-3
A-1 B-2 C-4 D-3
A-4 B-3 C- 1 D-2
A→1; B→3; C→4; D→2 (a)
Mg2+→ Hard acid H2O→ Hard base
R3P→ Soft base Ag+→ Soft acid