Question

Identify the pairs in which chemical substance is correctly matched with its use: (I) Liquid $CO_2$ - As solvent in dry cleaning, (II) $NaClO_3$ - herbicide, (III) $H_2O_2$ - bleaching agent.

• A. I only
• B. I, II only
• C. I, II, III
• D. II, III only

Hint:

Industrial chemical uses are common in competitive chemistry exams!

Answer 1

The Correct Option is C

Step 1: Understand the task.
We must check each chemical against the use given and keep only the correct matches.

Step 2: Check liquid carbon dioxide.
Liquid $CO_2$ is used as a green, non-toxic solvent in dry cleaning, replacing harmful organic solvents. So item I is correctly matched.

Step 3: Check sodium chlorate.
$NaClO_3$, sodium chlorate, is well known as a weed killer, that is, a herbicide. So item II is correctly matched.

Step 4: Check hydrogen peroxide.
$H_2O_2$ releases oxygen as it breaks down and is widely used to bleach fabrics, hair and paper. So item III is correctly matched.

Step 5: Combine the results.
All three pairs, I, II and III, line up correctly with their stated uses.

Step 6: Pick the option.
Since every match is right, the answer covers all three.
\[ \boxed{\text{I, II, III}} \]