Question

Identify the inorganic sulphides that are yellow in colour: (A) \( ({NH}_4)_2{S} \)
(B) \( {PbS} \)
(C) \( {CuS} \)
(D) \( {As}_2{S}_3 \)
(E) \( {As}_2{S}_5 \)
Choose the correct answer from the options given below:

• A. (A) and (B) only
• B. (A) and (C) only
• C. (A), (D) and (E) only
• D. (D) and (E) only

Hint:

Arsenic sulphides (\({As}_2{S}_3\) and \({As}_2{S}_5\)) are widely used in pigments due to their yellow coloration.

Answer 1

The Correct Option is D

To identify the inorganic sulfides that are yellow in color, let's examine the given compounds:

• \((NH_4)_2S\): Ammonium sulfide is not yellow; it appears as a colorless to pale yellow solution.
• \(PbS\): Lead(II) sulfide is black.
• \(CuS\): Copper(II) sulfide is black.
• \(As_2S_3\): Arsenic trisulfide is known for its yellow color.
• \(As_2S_5\): Arsenic pentasulfide is also yellow.

From this information, the correct yellow sulfides are \(As_2S_3\) and \(As_2S_5\). Therefore, the appropriate answer is:

(D) and (E) only