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a
A – I ; B – II; C – III; D– IV
b
A – III; B – IV ; C – II ; D – I
c
A – III; B – I ; C – II; D – IV
d
A – II; B–IV ; C – III; D – I
answer is B.
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Detailed Solution
CuSO4 … Salt of SA – WB …. Cu+2 undergoes hydrolysisKNO3 ….Salt of SA–SB … No hydrolysisNaCN …..Salt of WA – SB … CN− undergoes hydrolysisHCOONH4 …Salt of WA – WB … HCOO- & NH4+ undergo hydrolysis.