ANALYTICAL CHEMISTRY - 10 ICSE CHAPTER WISE QUESTIONS

ANALYTICAL CHEMISTRY

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Short answer questions

1.    State the colours of the following salts: a. FeSO4         b. CuSO4      c. Fe2(SO4)3                                    d. MgCO3          e. CaCl2

2.    Name two cations which are formed by non metals.

3.    Write the colors of the solutions containing the following cations:    Fe+2, Fe+3, Cu+2.

4.    Name two salts whose solutions are colourless.

5.    Name a chloride of a metal which is soluble in excess of NH4OH.

6.    Which reagent can be used to distinguish a solution containing a lead salt from a solution containing a zinc salt?

7.    Why does the blue precipitate of Cu(OH)2 turn black on heating?

8.    Which of the following ions in their solutions do not produce any precipitate with sodium hydroxide solution?

9.    Name the yellow monoxide that dissolves in hot and concentrated alkali. Give equation.

10. Name a hydroxide which is soluble in excess of ammonium hydroxide.

11. Sodium hydroxide solution is added to solution ‘A’. A white precipitate is formed which is insoluble in excess of NaOH solution. What is the metal ion present in solution ‘A’?

12. Name a white insoluble oxide that dissolves when fused with caustic soda or caustic potash.

Long answer questions

1.    What do you observe when NH4OH is added to: a. FeSO4, b. Fe2(SO4)3 solution?

2.    Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess  of NaOH solution. what is the metal ion present in solution A?

3.    State why aqueous solution of ammonia [NH4OH] is used for identification of cation.

4.    Identify the cation in each of the following case:

a. NaOH solution when added to the solution ‘A’ gives reddish brown ppt.            

b. NH4OH solution when added to the solution ‘B’gives white ppt which dissolves in excess. c. NaOH  when added to solution ‘C’ gives bluish white ppt which is insoluble in excess.  

d.NH4OH solution when added to solution ‘D’ gives dirty green ppt which changes to reddish brown after sometime.                                                        

e. NH4OH solution when added to the solution ‘E’ gives bluish white ppt which dissolves in excess to give deep blue solution.

5.    Zn(OH)2, Pb(OH)2 and Ca(OH)2 are all white precipitate. Zn(OH)2 and Pb(OH)2 dissolves in excess of sodium hydroxide solution but calcium hydroxide does not. Explain why it is so.

6.    You are given a mixture of precipitated copper(II) hydroxide and Zinc hydroxide. Name a solvent which will dissolve. a. both Cu(OH)2 and Zn(OH)2.     b. Only Zn(OH)2

7.    When NH4OH is added to solution B, a pale blue ppt is formed. This pale blue ppt dissolves in excess of NH4OH giving an inky blue solution. what is the cation present in solution B? What is the probable colour of solution B?

8.    When an ammonium salt is warmed with NaOH solution, ammonia gas is evolved. State three ways in which you could identify the gas.

9.    Write balanced chemical equations for the following: a. NaOH is added to CuSO4 solution.      b. NH4OH is added to FeCl3 solution .c. NaOH is added to FeCl2 solution.      

d. NaOH is added to Ca(NO3)2. e. NaOH solution is added to ZnSO4 a little in excess.

Conceptual questions

1.    A yellow solution of a metal salt yields a reddish brown precipitate with caustic soda solution. The precipitate does not dissolve in excess of the alkali. The reddish brown ppt on strong heating leaves behind a red powder, insoluble in water but soluble in dilute HCl.                A. Prove that the metal iron present in the salt.                                                               B. Write the chemical equation for the reaction involved.

2.    A compound (A) on strong heating gives two oxides of sulphur. On adding aqueous NaOH solution to its aqueous solution, a dirty green precipitate is obtained which starts turning brown on exposure to air. Identify (A)  and give chemical equations

3.    The hydroxides of Al and Fe are insoluble in water but NaOH is used to separate one from the other. Why?

Previous year ICSE Examination Questions

Short Answer Questions

1.    Write the balanced equations for the reaction between aluminum oxide and sodium hydroxide.

2.    What do you observe when excess of NH3 is passed through an aqueous solution of lead nitrate?

3.    From the list of metals given below, select a metal whose hydroxide is soluble in sodium hydroxide solution: Ca, Mg, Fe and Zn.

4.    Write balanced equations for (a) Al and (b) Zn, when warmed with caustic soda solution.

5.    What would you observe when NH4OH solution is added to iron(III)sulphate solution?

6.    Write a balanced equation for the following: iron (III) chloride solution with NaOH solution.

Long Answer Questions

1.    NaOH solution is added to the solutions containing the ions mentioned in List X.  List Y gives the details of the precipitate. Match the ions with their coloured precipitates                            

  List X                                                  List Y                                                 

a.    Pb+2                                        i. Reddish brown

b.    Fe+2                                        ii. White insoluble in excess

c.    Zn+2                                        iii. Dirty green

d.     Fe+3                                       iv. White soluble in excess

e.    Cu+2                                        v. White soluble in excess

f.     Ca+2                                        vi. Blue

2.    Write the equation for the following reactions:                                                              

a. ZnO is treated with NaOH solution.     b. NH4Cl is heated with NaOH.

3.    Identify the substances P, Q and R in each case based in the information given below:

a. The deliquescent salt P, turns yellow on dissolving in water, and gives a reddish brown precipitate with NaOH solution.                                                                       

b. The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.                                               

c. The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is soluble in mineral acids.

4.    Give one chemical test to distinguish between the following pairs of compounds iron (II) chloride, solution and iron (III) chloride solution.

5.    Give one test each to distinguish between the following pairs of chemicals:                     

a. Zinc nitrate solution and Calcium nitrate solution.                                                  

b. Iron(III) chloride solution and copper chloride solution.

6.    The questions (a) and (b) given below refer to the following salt solutions listed A to F:  

A: Cu(NO3)2     B: FeSO4       C: FeCl3        D: Pb(NO3)2          E: MgSO4      F: ZnCl2     

a.    Which salt solution becomes deep inky blue in colour when excess of ammonium hydroxide solution is added to it?

b.    Which salt solution gives a white precipitate with excess of NH4OH solution?

7.    NaOH solution is added first in a small quantity and then in excess to each of the aqueous salt solutions given below: CuSO4, Zn(NO3)2, Pb(NO3)2, CaCl2 and Fe2(SO4)3.            Copy the following table.                                       

Also, write the color of the precipitate obtained in (A) to (E) and the nature of the precipitate (soluble or insoluble) in (F) to (J):        

Aqueous salt solution	Ppt color with little NaOH	Nature of ppt with excess NaOH (Soluble or Insoluble)
Copper(II)sulphate	A	F
Zinc nitrate	B	G
Lead nitrate	C	H
Calcium chloride	D	I
Iron(III)sulphate	E	J

8.    What do you observe when NH4OH solution is added in excess to CuSO4 solution?

9.    What do you observe when NaOH solution is added to Zinc sulphate solution is excess?

10. a. How would you distinguish between Zn+2 and Pb+2 ions using NH4OH solution?              

  b.  The following table shows the tests a student performed on aqueous solution of A and B. What are his observations?                                                                                                          

Test	Observations	Conclusions
To solution A, NaOH was added		A contains Fe+3 ions
To solution B, NH4OH was added slowly till it was in excess		B contains Cu+2 ions.

11. State the effect of adding to small amount of

(i) NaOH       (ii) NH4OH – followed by an excess of (a) Ca(NO3)2      (b) Zn(NO3)2                        (c) Pb(NO3)2 solutions.