Question

The sol formed in the following unbalanced equation is:
\[ As_2O_3 + H_2S \rightarrow {?} \]

• A. As$_2$S$_2$
• B. As$_2$S$_3$
• C. As
• D. S

Hint:

Colloidal sols can form from precipitation reactions involving metal oxides and hydrogen sulfide.

Answer 1

The Correct Option is B

Step 1: Identify the Reaction Type 
The reaction involves arsenic(III) oxide reacting with hydrogen sulfide to form arsenic sulfide (\( As_2S_3 \)). 
Step 2: Balancing the Reaction 
\[ As_2O_3 + 3H_2S \rightarrow As_2S_3 + 3H_2O \] Here, arsenic oxide is reduced to arsenic sulfide while hydrogen sulfide is oxidized. 
Final Answer: The sol formed in this reaction is arsenic sulfide (\( As_2S_3 \)).