a) The formula of sodium plumbate is______. (NaPbO₂/Na₂PbO₂)
b) The colour of hydrated zinc sulphate is_____(blue/white)
c) On adding aqueous solution of Ammonium hydroxide to ferric chloride, a____ colour percipitate of ferric chloride is formed.(reddish brown/ sky blue).
d) The valency of Copper in copper sulphate is___ (1/2).
e) zinc chloride solution reacts with caustic soda solution to give a___ coloured percipitate. (red/ white).
f) The salt of lead, soluble in hot water insoluble in cold water is__ (lead sulphate lead/lead chloride)
2) NAME THE FOLLOWING:
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a) The precipitate formed with when NaOH solution is added to FeSO₄ solution.
b) The products formed when NH₄OH solution is added to CuSO₄ solution in excess.
c) The colour of precipitate formed on adding sodium hydroxide solution to solution to MgCl₂ solution.
d) The colour of the precipitate formed on adding NH₄OH solution to MgCl₂ solution.
e) The products formed when ZnSO₄ solution is added to sodium hydroxide solution in excess.
f) A solution of this compound gives a dirty green precipitate with sodium hydroxide.
3) STATE TRUE or FALSE :
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a) A reddish brown precipitate is formed when iron (III) Chloride and sodium hydroxide solutions are mixed.
b) Mixed copper sulphate solution is treated with sodium hydroxide solution, a pale blue precipitate of copper (II) hydroxide is formed.
c) The colour of precipitate of Mg(OH)₂ is dull white.
d) On adding aqueous solution of Ammonium hydroxide to lead nitrate solution, a green precipitate is formed, which is insoluble in excess of Ammonium hydroxide.
4) HOW WOULD YOU CONVERT:
a) aluminium into potassium metaluminate ?
b) zinc into potassium zincate ?
5) Give the equations for the action of aluminium with sodium hydroxide and potassium hydroxide.
6) Give equations for the action of aluminium oxide with concentrated sodium hydroxide and potassium Hydroxide.
7) How will you distinguish between MgSO₄ and ZnSO₄ by studying their reaction with NH₄OH ?
8) a) what are amphoteric oxides?
b) Why are these oxide react with NaOH ?
9) Write equation for each of the following reactions:
a) solutions of Ammonium Chloride and sodium hydroxide are mixed and heated.
b) Copper sulphate solution is added to sodium hydroxide solution.
10) Three test tubes contains calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions. Describe the effect of:
a) adding sodium hydroxide solution to each portion in turn till it is in excess.
b) Adding Ammonium hydroxide to each portion in turn till it is in excess.
11) Sodium hydroxide solution can be used to distinguish between iron(II) sulphate solution and iron (III) sulphate solution because these solutions give different coloured precipitate with sodium hydroxide solution. Give the colour of the precipitate formed with:
a) iron (II) sulphate solution.
b) iron(III) sulphate solution.
12) State what do you observe when :
a) Neutral Litmus solution is added to an alkaline solution.
b) ammonium Hydroxide is added to iron(III) sulphate solution.
13) How do you distinguish between using Zn⁺² and Pb⁺² using Ammonium hydroxide solution ?
14) State the colour of the following salts :
a) copper chloride.
b) copper nitrate
c) ferric chloride
d) Lead Nitrate
e) magnesium carbonate
f) zinc Hydroxide.
15) State the colour of the aqueous solution of the following salts:
a) magnesium sulphate crystals
b) ferrous chloride crystals.
c) ferric chloride crystals.
d) ferrous sulphate crystals.
e) copper sulphate crystals.
f) Ferric sulphate crystals.
16) Give the chemical equation to show reaction between caustic soda solution and:
a) zinc oxide.
b) Aluminium oxide
c) lead oxide.
17) State the colour of the precipitates formed when the ammonium Hydroxide is added to drop by drop and then in excess to aqueous solution of:
A) calcium chloride.
B) zinc sulphate.
C) Lead Nitrate.
D) ferrous sulphate.
E) ferric chloride.
F) copper sulphate.
18) How does Sodium Hydroxide react with the following salts ?
A) ZnSO₄
B) CuSO₄
C) FeSO₄
19) Describe the action of NH₄OH on the following:
A) CuSO₄
B) Fe₂(SO₄)₃
C) FeSO₄
20) Complete the following equations:
A) Zn(OH)₂ + NaOH--> __+ __
B) ___+ NaOH--> Fe(OH)₃+ NaCl
C) Zn(OH)₂+ NH₄OH --> __+__
D) lead and caustic soda solution.
E) aluminium and caustic Potash solution.
F) lead oxide the caustic soda solution.
G) ferrous chloride with Ammonium hydroxide.
H) CuSO₄+ __ --> Cu(OH)₂+ (NH₄)₂ SO₄
I) Al+ NaOH+ ___ -> __ + H₂.
J) PbO + NaOH -> __+__
K) __+ NaOH -> NaAlO₂+____
L) KOH+ H₂SO₄ -> __+___
M) ___+ HNO₃-> Pb(NO₃)₂ + ___.
N) CaCl₂+ ___ -> Ca(OH)₂+ NaCl.
O) __+ ___ -> Pb(OH)₂ +NaNO₃.
P) Pb(OH)₂+ NaOH-> __ + ___.
21) State the colour of precipitate observed when caustic soda solution is added to each of the following solutions( prepared in water):
a) copper sulphate crystals.
b) ferrous sulphate crystals.
c) ferric chloride crystals.
d) magnesium sulphate crystals.
e) Lead Nitrate crystals.
f) zinc chloride crystals.
g) magnesium chloride.
h) calcium chloride.
22) Give the reactions of Ammonium hydroxide with the following:
a) zinc chloride solution.
b) ferric chloride solution.
c) copper chloride solution.
d) magnesium sulphate solution
e) ferrous sulphate solution.
f) lead nitrate solution
g) zinc sulphate solution.
23) Write balanced equations for the action of Zinc and lead with:
a) Sodium Hydroxide.
b) potassium Hydroxide.
24) Give equations for the action of zinc oxide and lead oxide with concentrated sodium hydroxide and potassium Hydroxide.
25) Write the action of KOH on:
a) CuSO₄
b) MgSO₄
c) ZnSO₄
d) Fe₂(SO₄)₃
26) What products are formed when:
a) aqueous solution of NH₄OH is treated with zinc sulphate solution ?
b) Sodium Hydroxide is added to
MgSO₄(aq)
c) NaOH(aq) is added to Pb(NO₃)₂ solution ?
d) NaOH(aq) is treated with Al₂O₃
27) Using sodium hydroxide solution, how would you distinguish:
a) Ammonium Sulphate from sodium sulphate ?
b) zinc nitrate solution from calcium nitrate solution ?
c) iron(II) chloride (ferrous chloride) solution from iron(III) chloride(ferric chloride) solution?
d) lead hydroxide from magnesium hydroxide ?
28)
A) Sodium Hydroxide solution is added to solution A A white precipitate is formed which is insoluble in excess sodium hydroxide solution. What is the metal ion present in solution A?
B) When ammonium Hydroxide is added to solution B, it gives an inky blue solution. What is the cation present in solution B? What is the probable colour of solution B ?
C) when an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.
29) Write the observations and balanced equations for the following reaction:
A) Sodium Hydroxide is added drop- wise in excess to a solution of zinc sulphate.
B) ammonium Hydroxide is added first in a small quantity and then in excess to a solution of copper sulphate.
C) Excess of Ammonium hydroxide is added to a substance obtained by adding hydrochloric acid in silver nitrate solution.
D) Most starch iodide paper is put on the mouth of a test tube containing chlorine gas.
E) A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing Sulphur Dioxide gas.
29) Sodium hydroxide solution is added in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, Zinc nitrate, lead nitrate, calcium chloride and iron(III) sulphate. Write the colour of the precipitate and the nature of the precipitate (soluble or insoluble).
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