Question at position 14 Which of the following salt(s) is/are insoluble in pure water? i) Iron (III) sulfide ii) Lead nitrate iii) Magnesium chlorate iv) Sodium carbonateWhich of the following salt(s) is/are insoluble in pure water? i) Iron (III) sulfide ii) Lead nitrate iii) Magnesium chlorate iv) Sodium carbonatei and iii onlyiii onlyi onlyall four are insoluble in pure water

Question

BlackTom AI · Accepted Answer

The question asks which salts are insoluble in pure water. We need to evaluate each listed salt's solubility.
Option i and iii only: This claim includes iron(III) sulfide and magnesium chlorate as insoluble. Iron(III) sulfide is typically insoluble in water, but magnesium chlorate is a highly soluble salt; chlorates generally dissolve well in water. Therefore, this option incorrectly labels magnesium chlorate as insoluble.
Option iii only: This option asserts that only magnesium chlorate is insoluble. Since magnesium chlorate is soluble, and iron(III) sulfide is insoluble, this option is incorrect because it omits a true insoluble salt (iron(III) sulfide) and includes a soluble one as insoluble.
Option i only: This option lists iron(III) sulfide as insoluble and excludes the other salts. Given that iron(III) sulfide is insoluble in water while lead nitrate, magnesium chlorate, and sodium carbonate are soluble (with common chlorates and sodium salts typically very soluble, and nitrates like lead nitrate being soluble), this option aligns with the known solubility patterns. The combination matches the expectation that only iron(III) sulfide is insoluble among the four.
Option all four are insoluble in pure water: This is clearly false, as lead nitrate, magnesium chlorate, and sodium carbonate are soluble in water under standard conditions, so this statement cannot be correct.

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