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P Block Elements question

2024 · 1 Feb · Shift 1 · Q21
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P Block Elements question

2024 · 1 Feb · Shift 1 · Q21

JEE MainChemistryP Block ElementsNumerical+4 / −1
The number of white coloured salts, among the following is (a) SrSO4\mathrm{SrSO}_4SrSO4​(b) Mg(NH4)PO4\mathrm{Mg}\left(\mathrm{NH}_4\right) \mathrm{PO}_4Mg(NH4​)PO4​(c) BaCrO4\mathrm{BaCrO}_4BaCrO4​(d) Mn(OH)2\mathrm{Mn}(\mathrm{OH})_2Mn(OH)2​(e) PbSO4\mathrm{PbSO}_4PbSO4​(f) PbCrO4\mathrm{PbCrO}_4PbCrO4​(g) AgBr\mathrm{AgBr}AgBr(h) PbI2\mathrm{PbI}_2PbI2​(i) CaC2O4\mathrm{CaC}_2 \mathrm{O}_4CaC2​O4​(j) [Fe(OH)2(CH3COO)]\left[\mathrm{Fe}(\mathrm{OH})_2\left(\mathrm{CH}_3 \mathrm{COO}\right)\right][Fe(OH)2​(CH3​COO)]
Numerical answer
View written solutionFree

Correct answer: 5

  1. We identify the color of each given salt.

  2. Check one by one:

    1. SrSO4\mathrm{SrSO_4}SrSO4​ : white
    2. Mg(NH4)PO4\mathrm{Mg(NH_4)PO_4}Mg(NH4​)PO4​ : white
    3. BaCrO4\mathrm{BaCrO_4}BaCrO4​ : yellow
    4. Mn(OH)2\mathrm{Mn(OH)_2}Mn(OH)2​ : white (freshly precipitated; later may turn brown on oxidation)
    5. PbSO4\mathrm{PbSO_4}PbSO4​ : white
    6. PbCrO4\mathrm{PbCrO_4}PbCrO4​ : yellow
    7. AgBr\mathrm{AgBr}AgBr : pale yellow, not white
    8. PbI2\mathrm{PbI_2}PbI2​ : yellow
    9. CaC2O4\mathrm{CaC_2O_4}CaC2​O4​ : white
    10. [Fe(OH)2(CH3COO)]\left[\mathrm{Fe(OH)_2(CH_3COO)}\right][Fe(OH)2​(CH3​COO)] : basic ferric/ferrous acetate type compound is colored, not white

  3. Therefore, the white salts are:

SrSO4, Mg(NH4)PO4, Mn(OH)2, PbSO4, CaC2O4\mathrm{SrSO_4,\ Mg(NH_4)PO_4,\ Mn(OH)_2,\ PbSO_4,\ CaC_2O_4}SrSO4​, Mg(NH4​)PO4​, Mn(OH)2​, PbSO4​, CaC2​O4​
  1. Total number of white coloured salts:

555

Hence, the required integer answer is 555.

  1. Comparison with stored correct answer:

Stored correct answer = 555

Our derived answer = 555

So, the answer agrees with the stored correct answer.

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