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A reddish pink substance on heating give...

A reddish pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. It on cooling water is added to the residue it turns to its original colour. The substance is:

A

iodine crystals

B

copper sulphate crystals

C

cobalt chloride crystals

D

zinc oxide

Text Solution

Verified by Experts

The correct Answer is:
C
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GRB PUBLICATION-SALT ANALYSIS-J: IVth Group Cations
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  2. A solution containing SCN^(-) ions can be used to test one or more out...

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  3. The auxiliary reagent in group-IV reagent is:

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  4. To avoid the precipitation of hydroxides of Ni^(2+),Co^(2+),Mn^(2+) al...

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  5. A blue colouration (in solution or precipitate) is not obtained when:

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  6. In the fourth group, white precipitate of Mn(OH)(2) on heating with Pb...

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  7. A coloured solution of a salt gives following reactions: I. It gives...

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  8. Zn(OH)(2)darr is soluble in:

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  9. Which of the following metal sulphides has maximum solubility in water...

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  10. A reddish pink substance on heating gives off a vapour which condenses...

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  11. Among the following, buff colour metal sulphide is:

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  12. Black colour compound A is insoluble in HCI solution but soluble in aq...

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  13. When H(2)S gas a passed through an ammonical salt solution X, a slight...

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  14. Buff coloured cyanide compound (A) reacts with excess of KCN in presen...

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  15. Among the following, brownish black colour metal sulphide is:

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  16. How many structural isomers can be possible for yellow complex?

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  17. To increase significantly the concentration of free Zn^(2+) ion is a s...

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  18. CoS (black) obtained in group IV of salt analysis is dissolved in aqua...

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  19. A metal salt solution when treated with dimethyl glyoxime and NH(4)OH ...

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  20. An aqueous solution of colourless metal sulphate M, gives a white prec...

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