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JEE Main levelSingle correct optionDifficulty 2 of 3qa140

Aqueous lead nitrate is added to a solution of a sodium salt. A bright yellow precipitate forms that dissolves on boiling and reappears as shiny golden-yellow spangles on cooling. The anion is:

A $Br X^{-}$
B $Cl X^{-}$
C $CrO X_{4} X^{2 -}$
D $I X^{-}$

Answer: D

Pb X^{2 +} + 2 I X^{-} PbI X_{2}

, yellow, dissolving in hot water and recrystallising as golden spangles.

PbCl X_{2}

and

PbBr X_{2}

are white, and yellow

PbCrO X_{4}

does not dissolve in hot water.

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