Post-UTME Chemistry 2011 Objective — Question 9
Question 9 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
Advertisement
Which of the reactions of marble with dilute HCl is fastest?
- A. 5g of marble lump at 50 degrees C
- B. 5g of marble lump at 25 degrees C
- C. 5g of marble powder at 50 degrees CCorrect
- D. 5g of powder at 25 degrees C
Explanation
Both higher temperature and smaller particle size (powder, greater surface area) increase reaction rate; powder at the higher temperature (50 degrees C) reacts fastest.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.