Question

Assertion :Ammonium sulphide is used for testing 5th group cations. Reason: Most of the cations belonging to 5th group form different coloured precipitate with sulphides.

• 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

$Ammonium$ $sulfide$ $\left({\left(N{H}_3\right)}_{2}S\right)$ is not used instead $ammonium$ $carbonate$ is used for the testing of 5th group cations.

Also, the ions after separation can be easily distinguished by flame testing.

$Ba$ gives a yellow-green flame testing.

$Ca$ gives a brick red.

$Sr$ gives crimson red.