A reddish - pink substance on heating gives off a vapour which condenses on the sides of test cube and the substance turns blue. If on cooling water is added to the residue it turns to its original colour. The substance isA. Iodine crystalB. Copper sulphate crystalsC. Cobalt chloride crystalsD. Zinc oxide

A reddish - pink substance on heating gives off a vapour which condens

1.	A reddish - pink substance on heating gives off a vapour which condenses on the sides of test cube and the substance turns blue. If on cooling water is added to the residue it turns to its original colour. The substance isA. Iodine crystalB. Copper sulphate crystalsC. Cobalt chloride crystalsD. Zinc oxide
Answer» Correct Answer - C It is property of `CoCl_(2)`

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When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous `NaCl` to the blue solution gives a white precipitate O. Addition of aqueous `NH_(3)` dissolves O and gives an intense blue solution. The final solution containsA. `[Pb(NH_(3))_(4)]^(2+)` and `[CoCl_(4)]^(2-)`B. `[Al(NH_(3))_(4)]^(3+)]` and `[Cu(NH_(3))_(4)]^(2+)`C. `[Ag(NH_(3))_(2)]^(+)` and `[Cu(NH_(3))_(4)]^(2+)`D. `[Ag(NH_(3))_(2)]^(+)` and `[Ni(NH_(3))_(6)]^(2+)`
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To a metal nitrate, when KI solution is added, a black precipitate is produced at first , on additing excess of KI, orange solution is produced. Identify the meatl ionA. `Hg^(2+)`B. `Bi^(3+)`C. `Cu^(2+)`D. `Pb^(2+)`
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