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Q.

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a

A-1; B-3; C-2; D-4

b

A-4; B-1; C-2; D-3

c

A-1; B-2; C-3; D-4

d

A-4; B-2; C-1; D-3

answer is B.

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Detailed Solution

Na2S+CH3COO2Pb→PbS↓+2CH3COONa                                                        (Black)Na4FeCN6+Fe+3→Fe4FeCN63+4Na+                                                               BlueAgNO3+NaBr→AgBr↓+NaNO3                                         (Pale yellow)Na2S+Na2FeCN5NO→Na4FeCN5NO.S
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