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a
I-D; II-C; III-B; IV-A
b
I-C; II-D; III-B; IV-A
c
I-D; II-A; III-B; IV-C
d
I-C; II-A; III-D; IV-B
answer is B.
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Detailed Solution
K2S … salt of WA-SB … anionic hydrolysisFeSO4… salt of SA-WB … cationic hydrolysisHCOONH4… salt of WA-WB … cationic and anionic hydrolysisNaNO3… salt of SA-SB … No hydrolysis.