Q.

A white ppt. is obtained when:

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a

A solution of BaCl2 is treated with Na2CO3

b

A solution of CaCl2 is treated with Na2SO3

c

A solution of ZnSO2 is treated with Na2S

d

A solution of PbNO32 is treated with Na2CrO4

answer is A.

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A white ppt. is obtained when: