ICSE 2010 Important Papers of Chemistry By Mr. M.P.Keshari
ICSE Guess > ICSE Papers > Important Questions > Class X > 2010 > Chemistry > Chemistry By Mr. M.P.Keshari
Analytical Chemistry (Use of NaOH and NH4OH)
Q.1. Using Sodium hydroxide solution, how would you distinguish :
- Zinc nitrate (or sulphate)solution and Calcium nitrate solution?
- Iron (II) chloride from Iron (III) chloride?
- Lead hydroxide from Magnesium hydroxide?
| Zinc nitrate (or sulphate)
|When Sodium hydroxide solution is added a white precipitate is formed which is soluble in excess of sodium hydroxide.
||When Sodium hydroxide solution is added a white precipitate is formed which is insoluble in excess of Sodium hydroxide.
| Iron (II) chloride
||Iron (III) chloride
|When sodium hydroxide is added, dirty green precipitate is formed which changes to reddish brown after some time.
||When sodium hydroxide solution is added, a reddish brown precipitate is formed.
| Lead hydroxide
|When sodium hydroxide is added, lead hydroxide is dissolved in it.
||When sodium hydroxide is added, there is no visible reaction i.e. it remains insoluble.
- Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess of Sodium hydroxide solution. What is the metal ion present in solution A?
- When Ammonium hydroxide solution is added to solution B a pale blue precipitate is formed. This pale blue precipitate dissolves in excess of Ammonium hydroxide giving an inky blue solution. What is the cation present in solution B? What is the probable colour of solution B?
- Calcium ion [Ca2+]
- Copper ion [Cu2+]. The colour of solution ‘B’ is blue.
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