JEE Mains Model Paper 20

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Question : 80 of 90

Marks: +1, -0

Tests on an aqueous solution of a sodium salt having an anion Xn− gave the following resultsAnion, Xn−

K2Cr2O7+H2SO4

→

Green solution; Xn−

Pb(NO3)2(aq)

→

Black precipitate
Which one of the following could be Xn− ?

I−
NO2−
S2−
SO42−

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