A)1) "When an aqueous solutions of Ammonium hydroxide is added to zinc sulphate solution, a red percipitate of zinc hydroxide is obtained, which is insoluble in excess of Ammonium hydroxide solution." Is this statement correct ? If not, correct it.
2) "When solutions of ammonium hydroxide and copper sulphate are mixed , no precipitate is formed ." This statement is incorrect. Correct the statement.
3) State the colour of the participate observed when caustic soda solution is added to the zinc sulphate solution (prepared in water).
4) Write the balanced chemical equation to show the reaction of magnesium chloride solution and ammonium hydroxide.
5) State the colour of the precipitate formed when ammonium hydroxide is added drop by drop and then in excess to aqueous solution of the magnesium chloride.
6) How does sodium hydroxide solution act in distinguishing iron(II ) chloride from iron(III ) chloride solution ?
7) Write balanced equation for the following reaction.
Aluminium powder is warmed with hot and concentrated caustic soda solution.
8) Write balanced chemical equation for the following reaction:
Aluminium oxide and sodium hydroxide solution.
B) Give reasons :
1) A solution of ferrous chloride in water, which is very light green, changes into reddish brown colour when exposed to air for some time.
2) Green coloured crystals of ferrous sulphate turns brown when exposed to air for a long duration of time.
C) Fill in the blanks by choosing the correct word/s given within the brackets
1) The formula of sodium plumbate is____.(NaPbO₂/Na₂PbO₂)
2) The colour of hydrated zinc sulphate is_____.(blue/white)
3) On adding aqueous solution of Ammonium hydroxide to ferric chloride, a ____ colour precipitate of ferric chloride is formed . (reddish brown/ sky blue)
4) The valency of copper in copper sulphate is_____. (One/two )
5) Zinc chloride solution reacts with caustic soda solution to give a ____ coloured precipitate . (Red/white)
6) The salt of lead, soluble in hot water and insoluble in cold water is ____. (lead sulphate/ lead chloride)
D) Name the following:
1) The precipitate formed when NaOH solution is added to FeSO₄ solution.
2) The products formed when NH₄OH solution is added to CuSO₄ solution in excess .
3) The colour of the precipitate formed on adding sodium hydroxide solution to MgCl₂ solution.
4) The colour of the precipitate formed on adding NH₄OH solution to MgCl₂ solution.
5) The products formed when ZnSO₄ solution is added to sodium hydroxide solution in excess.
6) A solution of this compound gives a dirty green precipitate with Sodium hydroxide.
E) State whether True or False:
1) A reddish brown precipitate is formed when iron (III) chloride and sodium hydroxide solutions are mixed.
2) When copper sulphate solution is treated with sodium hydroxide solution, a pale blue percipitate of copper(II ) hydroxide is formed.
3) The colour of percipitate of Mg(OH)₂ is dull white.
4) On adding aqueous solution of Ammonium hydroxide to lead nitrate solution, a green percipitate is formed, which is insoluble in excess of Ammonium hydroxide.
Short Questions
1) How would you convert:
a) aluminium into potassium metaluminate ?
b) zinc into potassium zincate
2) Give equations for the action of aluminium with sodium hydroxide and potassium hydroxide.
3) Give equations for the action of aluminium oxide with concentrated sodium hydroxide and potassium hydroxide.
4) How will you distinguish between MgSO₄ and ZnSO₄ by studying their reaction with NH₄OH ?
5) a) What are amphoteric oxides ?
b) Why these oxides react with NaOH ?
6) Write down equation for each of the following reactions:
a) Solution of the ammonium chloride in sodium hydroxide are mixed and heated.
b) copper sulphate solution is added to sodium hydroxide solution
7) Three test tubes contain 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.
8) Sodium hydroxide solution can be used to distinguish between iron(II) sulphate solution and iron(III) sulphate solution because these solutions give different coloured precipitates with sodium hydroxide solution. Give the colour of the precipitate formed with:
a) iron(II) sulphate solution.
b) iron(III) sulphate solution.
9) 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.
10) How do you distinguish between Zn²⁺ and Pb²⁺ using Ammonium hydroxide solution ?
Each Question Carries 3 Marks:
1) 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.
2) State the colour of the aqueous solution of the following salts :
a) magnesium sulphide crystals.
b) ferrous chloride crystals.
c) ferric chloride crystals .
d) ferrous sulphate crystals .
e) ferric sulphate crystals .
f) copper sulphate crystals.
3) Give the chemical equation to show the reaction between caustic soda solution and:
a) zinc oxide.
b) Aluminium oxide.
c) lead oxide.
4) State the colour of the percipitates formed when ammonium hydroxide is added 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.
5) How does Sodium hydroxide react with the following salts ?
a) ZnSO₄.
b) CuSO₄
c) FeSO₄
6) Describe the action of NH₄OH on the following:
a) CuSO₄
b) Fe₂(SO₄)₃
c) FeSO₄
7) Complete the following equations:
a) Zn(OH)₂ + NaOH---> _______+ ____
b) _____ + NaOH ---> Fe(OH)₃ + NaCl.
c) Zn(OH)₂ + NH₄OH ---> _____+ ____
Long Type Questions:
1) Give balanced chemical equations to show the reaction of:
a) lead and caustic soda solution.
b) aluminium and caustic Potash solution.
c) lead oxide with caustic soda solution.
d) ferrous chloride with Ammonium hydroxide.
2) State the colour of the percipitate 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.
3) Give the reactions of Ammonium hydroxide with the formation :
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.
4) Write balanced equations for the action of zinc and lead with:
a) Sodium hydroxide.
b) potassium hydroxide.
5) Give equation for the action of zinc oxide and lead oxide with concentrated sodium hydroxide and potassium hydroxide.
6) What is the action of KOH on:
a) CuSO₄
b) MgSO₄.
c) ZnSO₄
d) Fe₂(SO₄)₃
7) Complete and balance the following equations:
a) CuSI₄+ ____ ---> Cu(OH)₂+ (NH₄)₂SO₄
b) Al + NaOH + ____ ---> ____+ H₂
c) PbO + NaOH-->]____+ ____
d) ____+ NaOH---> NaAlO₂+ ______ .
8) What products are found when :
a) aqueous solution of NH₄OH is treated with zinc sulphate solution ?
b) Sodium hydroxide is added to is added to MgSO₄(aq) ?
c) NaOH(aq) is added to Pb(NO₃)₂ solution ?
d) NaOH(aq) is treated with Al₂O₃?
9) Using sodium hydroxide solution. how would you distinguish
a) Ammonium sulphate from sodium sulphate ?
b) zinc nitrate solution from calcium nitrate solution ?
c) Iron (III) chloride (ferrous chloride) solution from iron(III) chloride (ferric chloride) solution ?
d) lead hydroxide from magnesium hydroxide ?
1) Complete and balance the following equations:
a) KOH + H₂SO₄ --> ____+ ___
b) ____+ HNO₃---> Pb(NO₃)₂ + ____.
c) CaCl₂ + ____ --> Ca(OH)₂+ NaCl
d) ____+ ____ --> Pb(OH)₂+ NaNO₃
e) Pb(OH)₂ + NaOH ---> ___+ ____
2) 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 a 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, ammonium gas is evolved. State three ways in which you could identify this gas.
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