most important questions
for practical chemistry for icse board examination ?
Answers
Answer: Identification of hydrogen sulphide,
colour of flames of the four cations ( k, na, ca , cu),
Decomposition of lead chloride and ammonium nitrate.
Basically all the observations and colour of precipitates. Good luck!
Explanation:
Answer:
1) State the colour of the residue obtained on cooling when the following carbonates are heated
2) Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calciumchloride and iron (III) sulphate. For each of the aqueous salt solutions, state
3) The questions below refer to the following salt solutions listed A to F : A : Copper nitrate B : Iron (II) sulphate C : Iron (HI) chloride D : Lead nitrate E : Magnesium sulphate F : Zinc chloride.
a) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution, (i.e. white ppt. insoluble in dil. HCl)
b) Which two solutions will give a white ppt. when treated with dil. HNO3 and AgNO3 soln.
c) Which soln. will give a white ppt. when either dil. HCl or dil. H2SO4 is added to it.
d) Which soln. becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it.
e) Which solution gives a white precipitate with excess ammonium hydroxide solution.
Explanation:
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