Question

Which of the following carbon allotropes is not correctly matched with its use?

• A. Graphite -- as electrode in batteries
• B. Diamond -- as abrasive for cutting hard tools
• C. Coke -- as reducing agent in extraction of metals
• D. Carbon black -- adsorbing poisonous gases \bigskip

Hint:

• Graphite \(\rightarrow\) Electrodes and lubricants
• Diamond \(\rightarrow\) Cutting and drilling tools
• Coke \(\rightarrow\) Reducing agent in metallurgy
• Activated charcoal \(\rightarrow\) Adsorbent for poisonous gases

Answer 1

The Correct Option is D

Step 1: Graphite: electrode. Diamond: cutting/drilling. Coke: reducing agent. Carbon black: used in tyres/inks, not adsorbing poisonous gases (activated charcoal does that). Mismatch is carbon black.

Step 2: Write the final answer. \(\boxed{\text{Carbon black -- adsorbing poisonous gases}.}\)