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Syllabus
55. The reaction that differs from the rest of the reactions given is
(A) Formation of calcium oxide from limestone
(B) Formation of aluminium from aluminium oxide
(C) Formation of sodium carbonate from sodium hydrogen carbonate
(D) Formation of mercury from mercuric oxide
Name the metal hydroxides which are :
(i) Insoluble, (ii) Soluble,
in (a) Caustic soda solution (b) Ammonium hydroxide solution.
Al?O?
Al
Al(OH)?
(A) 60.4 g
(B) 30.2 g
(C) 16.8 g
(D) 8.4 g
53. The mass of sodium chloride formed when 5.3 g of sodium carbonate is dissolved in 250 ml of ?
(A) 5.85 g (B) 7.32 g
(C) 11.7 g (D) 58.5 g
1. Pb(NO3)2 and Zn(NO3)2
2. CaCl2 and Cucl2
Write the reaction and observations
Explain why
1. Inert gases have high IP
2. Anion has a bigger atomic radius than its parent atom
Q2004. Sodium hydroxide solution is added first in a small amount, then in excess to the aqueous salt solutions of
a] copper [II] sulphate b] zinc nitrate c] lead nitrate d] iron [III] sulphate. State in each case-
i] the colour of the precipitate when NaOH is added in a small quantity;
ii) the nature of precipitate [i.e. soluble or insoluble ] when NaOH is added in excess.
Write balanced equations for - a] Aluminium b] Zinc - is warmed with NaOH [ caustic soda ] soln.
Q2005. The questions below refers to the following salt solutions listed A to F: A :- Copper nitrate.
B: Iron [II] sulphate, C : Iron [III] chloride, D : Lead nitrate, E : Magnesium sulphate, F : Zinc chloride.
i] Which soln. becomes a deep / inky blue colour when excess of ammonium hydroxide is added to it.
ii] Which solution gives a white precipitate with excess ammonium hydroxide solution.
[Relative molecular mass of ammonium nitrate is 80, O = 16]
A balanced equation must be molecular.
ZnCl?
CuCl?
NH?Cl
FeCl?
It gives white ppt with less NaOH and white ppt with barium chloride solution insoluble in concentrated HCl.
[Mg=24,N=14,O=16 and H=1]
Q. Write balanced equations for the following conversions
(b) Sodium hydroxide is added to the solutions containing the ions X. List Y give of the precipitate. Match the ions with their coloured precipitated :-
List X List Y
(1) Pb2+ (a) Reddish brown
(2) Fe2+ (b) Blue
(3) Zn2+ (c) Dirty green
(4) Fe3+ (d) White soluble in excess
(5) Cu2+ (e) White soluble in excess