The number of white coloured salts among the following is ____ (A) $\mathrm{SrSO}_{4}$ (B) $\mathrm{Mg}(\mathrm{NH}_{4})\mathrm{PO}_{4}$ (C) $\mathrm{BaCrO}_{4}$ (D) $\mathrm{Mn}(\mathrm{OH})_{2}$ (E) $\mathrm{PbSO}_{4}$ (F) $\mathrm{PbCrO}_{4}$ (G) AgBr (H) $\mathrm{PbI}_{2}$ (I) $\mathrm{CaC}_{2}\mathrm{O}_{4}$ (J) $[\mathrm{Fe}(\mathrm{OH})_{2}(\mathrm{CH}_{3}\mathrm{COO})]$

JEE Main · 2024 · 01 Feb 2024 · Shift 1 · Practical and Analytical Chemistry

The number of white coloured salts among the following is ____
(A)

SrSO_{4}

(B)

Mg (NH_{4}) PO_{4}

(C)

BaCrO_{4}

(D)

Mn (OH)_{2}

(E)

PbSO_{4}

(F)

PbCrO_{4}

(G) AgBr
(H)

PbI_{2}

(I)

CaC_{2} O_{4}

(J)

[Fe (OH)_{2} (CH_{3} COO)]

Answer: 5

Solution

Checking the colour of each salt: SrSO

_{4}

(white), Mg(NH

_{4}

)PO

_{4}

(white), BaCrO

_{4}

(yellow), Mn(OH)

_{2}

(white, though it darkens on air oxidation), PbSO

_{4}

(white), PbCrO

_{4}

(yellow), AgBr (pale yellow), PbI

_{2}

(yellow), CaC

_{2}

_{4}

(white), [Fe(OH)

_{2}

(CH

_{3}

COO)] (brownish-red).
White salts: SrSO

_{4}

, Mg(NH

_{4}

)PO

_{4}

, Mn(OH)

_{2}

, PbSO

_{4}

, CaC

_{2}

_{4}

— a total of 5.

JEE Main · 2024 · 01 Feb 2024 · Shift 1 · Integer answer

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