Question

Assertion :The fourth group cations when precipitated gives same colour. Reason: All the metal ions present in different groups ,show necessarily the different colours in their respective groups.

• 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 D Both Assertion and Reason are incorrect

If the fourth group cations, $Zn$ salts are colorless, $manganese$ salts are faint pink or colorless and $nickel$ and $cobalt$ salts may be brightly colored, often blue-green.

The precipitate is washed in water & is reacted with dilute $HCl$ this precipitates $Ni$ salts. Now, the resultant liquid is filtered and reacted with an excess of $NaOH,$ this precipitate $Mn$ salts $H_{2}S$ is then passed through the supernatant liquid. If a white precipitate forms, $Zn$ is present. Thus, the fourth group cations when precipitation forms different colors.

Also, all the metal ions present in different group, show different colors in the respectuie group, but they can even show same colors.