Which one of the following statements is not correct ?A. Mercury (II) iodide dissolve in excuess of poptassium iodide solutiuonB. Tin (IV) chloride is made by dissolving tin solution in concentrated hydrochloric acidC. Zinc dissolves in sodium hydroxide solutionD. Carbon monoxide reduces iron (III) oxide to iron

Which one of the following statements is not correct ?A. Mercury (II)

1.	Which one of the following statements is not correct ?A. Mercury (II) iodide dissolve in excuess of poptassium iodide solutiuonB. Tin (IV) chloride is made by dissolving tin solution in concentrated hydrochloric acidC. Zinc dissolves in sodium hydroxide solutionD. Carbon monoxide reduces iron (III) oxide to iron
Answer» Correct Answer - B Stannic chloride `(SnCI_(4))` is prepared by passing dry chlorine over fused tin in a retort. The vapors of stannic chloride are condensed in water cooled receiver: `Sn + 2CI_(2) rarr SnCI_(4)` Tin is not attacked by organic acids. This property is utilized fopr tinning cooking utensils made of copper or brass. It dissolves slowly in dil. HCI but readily in conc. HCI `Sn + 2HCI rarr SnCI_(2) + H_(2)` (1) The precipitated of mercuric iodidle dissolves in excess of potassium iodide forming a complex, `K_(2)HgI_(4)` : `HgI_(2) + 2KI rarr K_(2)HgI_(4)` (3) Zinc dissolved is hot caustic alkali solutions forming alkali zincate and evolving hydrogen: `Zn + 2NaOH rarr Na_(2)ZnO_(2) + H_(2)` Sodium zincatwe (4) `3F_(2)O_(3) + CO rarr 2F_(3)O_(4) + CO_(2)` `Fe_(3)O_(4) + 4CO rarr 3Fe + 4CO_(2)`

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