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Colour and Solubility

Zinc on being...

Question

Zinc on being tested with cobalt nitrate solution gives green colour residue with chemical composition of :

A

ZnO.CoO

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B

ZnCoO + Nitrogen dioxide

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C

ZnO + Nitrogen dioxide

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D

none of the above

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Solution

The correct option is A ZnO.CoO
In cobalt nitrate test a drop of cobalt nitrate solution is added in the residue left in charcoal cavity, it is heated in an oxidizing flame and the color of residue suggests cation. Zinc on being tested with cobalt nitrate solution gives green colour residue with chemical composition of $Z n O . C o O$

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Similar questions

Q. (a) State the colour of the residue formed when nitrates of
1. Calcium 2. Zinc 3. Lead 4. Copper are strongly heated.

(b) Give one test each to distinguish between the following pairs of chemicals.
1. Zinc nitrate solution and calcium nitrate solution.
2. Sodium nitrate solution and sodium chloride solution.
3. Iron (III) chloride solution and copper chloride solution.

Q. Give a chemical test to distinguish between the following pairs of chemicals.
(i) Lead nitrate solution and Zinc nitrate solution.
(ii) Sodium chloride solution and Sodium nitrate solution.

Q. Give a chemical test to distinguish between the following.

Calcium nitrate and zinc nitrate.

Q. Assertion :In a procedural modification of cobalt nitrate test,2-3 drops of nitric acid & 2-3 drops of cobalt nitrate solution are added to the residue of charcoal cavity. A thin strip of filter paper is dipped in the solution & burned in non-luminous part of the flame. Different cations give ash of characteristic colors. Reason: Ash test is done in a similar way.

Q. Describe in each case, one chemical test that would enable you to distinguish between the following pairs of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
(i) Sodium chloride solution and sodium nitrate solution.
(ii) Sodium sulphate solution and sodium chloride solution.
(iii) Calcium nitrate solution and zinc nitrate solution.

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