Chemistry neco 2008

In which of these groups will all the substances be insoluble in water?

a

Na2CO3, KNO3,(NH4)2C03

b

NaHCO3, PbSO4, CaSO4

c

K2C03, CaSO4, AgNO3

d

PbCl2, NaCl, ZnCl2

e

ZnCO3, BaSO4,AgCl

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