Post-UTME Chemistry 2016 Objective — Question 18
Question 18 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2016 Objective paper, with the correct answer and a full explanation.
Advertisement
On the addition of excess aqueous ammonia to a mixture of Zn2+(aq) and Al3+(aq), the precipitate obtained is
- A. zinc hydroxide
- B. aluminium hydroxideCorrect
- C. ammonium zincate
- D. ammonium aluminate
Explanation
Zn(OH)2 dissolves in excess ammonia (forming a soluble complex), while Al(OH)3 does not, so the precipitate remaining is aluminium hydroxide.
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.