Question

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.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

In a procedural modification of cobalt nitrate test. 2-3 drops of cobalt nitrate solution are added to the residual of a charcoal cavity. A thin strip of filter paper is dipped in the solution and burned in non-luminous part of the flame. Different cations give ash of characteristics colours.

Examples: Blue indicates $A{l}^{+3}$

Green indicates $Z{n}^{+2}$

Pinkish indicates $M{g}^{+2}$

Reason:

Ash test performed in similar way$\to$ (wrong/false)

Ash test is used to detect the presence of filler.

It is just done by burning polymers at 300${}^{\circ }C$ and measuring the weight of residue.