Students of ICSE Class 10 should refer to Analytical Chemistry ICSE Class 10 Chemistry board year questions and solutions. below which have come in past board exams. You should always go through questions that have come in previous years. This will help you to understand the pattern of questions in ICSE Class 10 Chemistry and prepare accordingly. This will help you to get better marks in ICSE Class 10 Board Exams
ICSE Class 10 Chemistry Analytical Chemistry Board Exam Questions
Students should learn the important questions and answers given below for Chapter Analytical Chemistry in Chemistry for ICSE Class 10. These board questions are expected to come in the upcoming exams. Students of ICSE Class 10th should go through the below board exams questions and answers which will help them to get more marks in exams.
Board Exam Questions Analytical Chemistry ICSE Class 10 Chemistry
Question. Salts of normal elements [1 [IA] to 17 (VIIA)] are generally………………….
Answer
colourless
Question. Ferrous salts are…………in colour.
Answer
light green
Question. An example of weak alkali solution………………….
Answer
ammonium hydroxide
Question. Both ammonium and sodium hydroxide are used in analytical chemistry for identifying.…… of salts.
Answer
cations
Question. Zinc chloride solution reacts with ammonium hydroxide solution to give a ………………….. coloured precipitate.
Answer
white
Question. Calcium salts with sodium hydroxide give………precipitates.
Answer
white
Question. Ammonium hydroxide is a weak alkali which dissociates partially to furnish………OH–ions which precipitate…………metal hydroxides.
Answer
insufficient, soluble
Question. Sodium zincate and water is obtained on reaction of …………with concentrated caustic soda.
Answer
zinc oxide
Question. …………… and …………salt dissolve in sodium hydroxide.
Answer
zinc, lead
Question. Oxides and hydroxides of certain metals such as…………are amphoteric in nature.
Answer
zinc, lead, aluminium
Question. Amphoteric oxides and hydroxides react with an………to give salt and water only.
Answer
acid as well an alkali
Question. An oxide of a metal which is amphoteric in nature is………
Answer
Lead oxide, PbO
Question. Zn(OH)2, Pb(OH)2 and Al(OH)3 are…………hydroxides.
Answer
amphoteric
Question. ……………, a white precipitate is soluble in excess NH4OH.
Answer
AgCl
Multiple Choice Questions
Question. Salts of which elements are generally coloured :
(a) Transition
(b) Normal
(c) Lanthanides
(d) Inner-transition.
Answer
B
Question. Which one of the following salt solutions on reaction with excess of ammonium hydroxide solution gives a deep blue solution ?
(a) FeCl3 (aq.)
(b) CuSO4 (aq.)
(c) Al2(SO4)3 (aq.).
(d) ZnSO4 (aq.)
Answer
B
Question. Which one of the following salt solutions on reaction with excess sodium hydroxide solution gives a clear solution finally ?
(a) (PbNO3)2 (aq)
(b) CuSO4 (aq)
(c) FeCl3 (aq)
(d) ZnSO4 (aq.)
Answer
A
Question. The precipitate of which of the following compounds is soluble in excess of ammonia solution ?
(a) Iron (II) chloride
(b) Magnesium chloride
(c) Copper (II) sulphate
(d) Lead nitrate
Answer
C
Question. Which one of the following salt solutions on reaction with excess of ammonium hydroxide solution results finally in dissolution of the precipitate first formed ?
(a) AlCl3 (aq.)
(b) FeSO4 (aq.)
(c) Fe(SO4)3 (aq.)
(d) ZnSO4 (aq.)
Answer
D
Question. Hydroxide of this metal is soluble in sodium hydroxide solution.
(a) Magnesium
(b) Lead
(c) Silver
(d) Copper
Answer
B
Question. The hydroxide which is soluble in excess of NaOH is :
(a) Zn(OH)2
(b) Fe(OH)2
(c) Fe(OH)3
(d) Al(OH)3
Answer
A
Question. Name the reagent from the following which can be used to distinguish zinc nitrate solution from magnesium nitrate.
(a) NH4OH (aq.)
(b) NaOH (aq.)
(c) BaCl2
(d) H2SO4
Answer
A
Question. The oxide and hydroxide of which metal is amphoteric :
(a) Zinc
(b) Copper
(c) Iron
(d) Manganese
Answer
A
Question. Anhydrous iron (III) chloride is prepared by :
(a) Direct combination
(b) Simple displacement
(c) Decomposition
(d) Neutralization
Answer
A
Question. A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide is :
(a) Calcium chloride
(b) Ferrous chloride
(c) Ferric chloride
(d) Copper chloride
Answer
D
Give One Word/Chemical Term
Question. Name two coloured and two colourless metal ions.
Answer
Coloured-Cu2+, Fe2+ colourless—Mg2+, Pb2+
Question. A strong and weak alkali.
Answer
Sodium hydroxide (NaOH), ammonium hydroxide (NH4OH)
Question. A salt of zinc which is efflorescent.
Answer
Zinc sulphate (ZnSO4)
Question. The ion responsible for the blue colour of an aqueous solution of a salt.
Answer
Copper
Question. One metal which forms more than one type of positive ions.
Answer
Iron
Question. A yellow monoxide that dissolves in hot and concentrated caustic alkali.
Answer
Lead monoxide, PbO
Question. A chloride which gives reddish brown precipitate with sodium hydroxide solution.
Answer
Ferric chloride
Question. A metallic hydroxide which is insoluble in caustic soda but soluble in excess of NH4OH.
Answer
Copper hydroxide, Cu(OH)2
Question. A metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
Answer
Zinc, Zn
Question. An oxide which dissolves in both acid as well as base.
Answer
Lead oxide, PbO
Question. An amphoteric oxide.
Answer
Aluminium oxide (Al2O3)
Question. A metallic hydroxide soluble in excess of ammonium hydroxide solution.
Answer
Zinc hydroxide, Zn (OH)2
State the Observation
Q. What do you observe when (write equations if necessary) :
Question. Sodium hydroxide solution is slowly added and then in excess to zinc sulphate solution.
Answer
1. Sodium hydroxide solution when slowly added to zinc sulphate solution, a white precipitate of zinc hydroxide is obtained, which is soluble in excess of sodium hydroxide to form a clear solution of sodium zincate.
Question. To a solution of lead nitrate small amount of sodium hydroxide is added and then excess of sodium hydroxide is added.
Answer
A curdy white precipitate of lead hydroxide is formed which dissolves in excess NaOH giving a colourless solution.
Question. When sodium hydroxide is added to a solution of ferric chloride write equation for the reaction taking place.
Answer
When sodium hydroxide solution is added to ferric chloride, a reddish brown precipitate of ferric hydroxide, insoluble even in the excess of the sodium hydroxide, is obtained.
Question. Ammonium hydroxide solution is added to Iron (II) sulphate solution.
Answer
A dirty green ppt. of ferrous hydroxide Fe(OH)2, insoluble in excess of NH4OH, is formed
Question. Ammonium hydroxide is added to iron (III) sulphate solution.
Answer
A reddish brown precipitate of iron (III) hydroxide is formed.
Question. Ammonium hydroxide solution is slowly added and then in excess to copper sulphate solution.
Answer
Ammonium hydroxide solution, when slowly added to copper sulphate solution, light blue precipitate of copper hydroxide is obtained, which is soluble in excess of ammonium hydroxide to form an intense deep blue solution of tetra amine cupric sulphate.
Question. Ammonium hydroxide is added to zinc sulphate solution. Write the name and the formula of the final product.
Answer
White ppt. of Zn(OH)2 formed which redissolves to give a colourless solution of tetraamine zinc sulphate [Zn(NH3)4]SO4.
Question. Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess.
Answer
Initially a light blue ppt. is formed which on addition of excess of ammonium hydroxide dissolves and a deep inky blue solution is formed.
Question. Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.
Answer
Initially a white ppt. is formed which disappears (dissolves) in excess of ammonium hydroxide.
Question. Ammonium hydroxide solution is added to iron (III) chloride solution.
Answer
A reddish brown ppt. of ferric hydroxide insoluble in excess of NH4OH is formed.
Balancing/Writing the Chemical Equations
Write balanced chemical equations to show the reactions of the following :
1. Aluminium and caustic potash solution.
Answer
2. Aluminium oxide and sodium hydroxide.
Answer
3. Aluminium oxide and potassium hydroxide.
Answer
4. Zinc oxide and potassium hydroxide.
Answer
5. Zinc is heated with sodium hydroxide solution.
Answer
6. Zinc oxide dissolves in sodium hydroxide.
Answer
7. Caustic soda solution and zinc oxide.
Answer
8. Caustic soda solution and aluminium oxide.
Answer
9. Caustic soda solution and lead monoxide.
Answer
10. Action of KOH on CuSO4
Answer
11. Action of KOH on CaSO4
Answer
12. Action of KOH on ZnSO4
Answer
13. Action of KOH on Fe2(SO4)3.
Answer
14. Action of sodium hydroxide on freshly precipitated aluminium hydroxide.
Answer
15. Zinc oxide is treated with sodium hydroxide solution.
Answer
Chemical Tests
1. Zinc nitrate solution and calcium nitrate solution.
Answer
Add NaOH solution in excess to the two solutions. The one in which white ppt. initially formed dissolves in excess of NaOH solution is Zn(NO3)2 solution and the other is Ca(NO3)2 solution.
2. Sodium nitrate solution and sodium chloride solution.
Answer
Add freshly prepared ferrous sulphate solution to the two solutions. Then by the side of the test tube, pour conc. sulphuric acid to each slowly. The one in which brown ring appears is sodium nitrate solution while the other is sodium chloride solution.
3. Iron(III) chloride solution and copper chloride solution.
Answer
Add NaOH solution to both the solutions. The one which gives a reddish brown ppt. is iron(III) chloride solution and the one which gives blue ppt. is copper chloride solution.
4. Iron(II) sulphate solution and copper(II) sulphate solution.
Answer
When sodium hydroxide solution is added to iron(II) sulphate solution, a dirty green precipitate is formed. When sodium hydroxide solution is added to copper(II) sulphate solution, light blue precipitate is formed.
5. Zinc nitrate solution and calcium nitrate solution.
Answer
When ammonium hydroxide is added to zinc nitrate solution, a white precipitate is formed. The white precipitate dissolves when excess of ammonium hydroxide is added.
When ammonium hydroxide is added to calcium nitrate solution, no visible reaction occurs even with the addition of excess of NH4OH.
6. Iron(II) chloride and Iron(III) chloride solution.
Answer
When sodium hydroxide is added to iron(II) chloride, dirty green precipitate of Fe(OH)2 is formed.
FeCl2 + 2NaOH ⎯→ Fe(OH)2 ↓ + 2NaCl
When sodium hydroxide is added to iron(III) chloride, reddish brown precipitate is formed.
FeCl3 + 2NaOH ⎯→ Fe(OH)3 + 3NaCl
Short Questions
Q. 1. What are the use of sodium and ammonium hydroxide in analytical chemistry ?
Answer
Sodium hydroxide and ammonium hydroxide are used in analytical chemistry to precipitate insoluble metal hydroxide.
Q. 2. Out of the following metallic ions : Al3+, Ca2+, Cu2+, Pb2+ and Zn2+; which one forms a white hydroxide which dissolves in an excess of either aqueous sodium hydroxide or ammonium hydroxide ?
Answer
Zn2+.
Q. 3. Which reagent can be used to distinguish a solution containing a lead salt from a solution containing a zinc salt ?
Answer
Ammonium hydroxide.
Q. 4. A metal, whose alloy is used in the construction of aircrafts, in the powdered form was added to sodium hydroxide solution, a colourless gas was evolved and after the reaction was over, the solution was colourless.
(i) Name the powdered metal added to sodium hydroxide solution.
(ii) Name the gas evolved.
Answer
(i) Aluminium (ii) Hydrogen
Q. 6. The questions (i) to (v) refer 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 two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution ?
(ii) Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it ?
(iv) Which solution becomes a deep or inky blue colour when excess of ammonium hydroxide is added to it ?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution ?
Answer
(i) B and E (Iron II sulphate and magnesium sulphate).
(ii) C and F (Iron III chloride and zinc chloride) (iii) D (lead nitrate)
(iv) A (copper nitrate) (v) F (Zinc chloride)
Q. 7. What do you observe when caustic soda solution is added to the following solutions first a little and then in excess :
(i) FeCl3 (ii) Al2(SO4)3 (iii) ZnSO4 (iv) Pb (NO3)2 (v) CuSO4
Also give balanced chemical equations.
Answer
Q. 8. (i) What are amphoteric metals ? Describe their reactions with hot caustic alkali.
(ii) What are amphoteric oxides ? Why these oxides react with NaOH ?
Answer
