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Chapters
2: Chemical Bonding
3: Acids, Bases and Salts
▶ 4: Analytical Chemistry
5: Mole Concept and Stoichiometry
Chapter 6: Electrolysis
Chapter 7: Metallurgy
Chapter 8: Study of Compounds: Hydrogen Chloride
Chapter 9: Study of Compounds: Ammonia
Chapter 10: Study of Compounds: Nitric Acid
Chapter 11: Study of Compounds: Sulphuric Acid
Chapter 12: Organic Chemistry
Chapter 13: Practical Work
![Lakhmir Singh solutions for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई chapter 4 - Analytical Chemistry - Shaalaa.com](/images/chemistry-english-class-10-icse_6:b9d33ffc3c864725b49a398fa5334703.jpg "Lakhmir Singh solutions for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई chapter 4 - Analytical Chemistry")
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Solutions for Chapter 4: Analytical Chemistry
Below listed, you can find solutions for Chapter 4 of CISCE Lakhmir Singh for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई.
Lakhmir Singh solutions for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई 4 Analytical Chemistry Intext Question [Pages 82 - 86]
TEST YOUR UNDERSTANDING - 1
State whether the following statement is True or False.
The colour of zinc hydroxide obtained by reaction of zinc sulphate and NaOH is reddish-brown.
State whether the following statement is True or False.
Qualitative analysis deals with the estimation of composition of the constituents in a sample.
State whether the following statement is True or False.
All alkalis are bases but all bases are not alkalis.
State whether the following statement is True or False.
Copper hydroxide in the presence of an excess of ammonium hydroxide gives an insoluble ammonia complex.
Fill in the following blanks with suitable words.
Nickel ion has ______ colour.
When sodium hydroxide is heated with ammonium salts, ______ gas is evolved.
Choose the correct option for each of the following questions.
White coloured precipitate is formed on formation of ______.
Ca(OН)2
Fe(OН)2
Cu(OН)2
None of these
Salts of which of the following groups are colourless?
1st
2nd
13th to 17th
All of these
On adding ammonium hydroxide to metallic salts:
no reaction occurs
precipitate of metallic hydroxide is formed
soluble metallic hydroxide is formed
None of these
Which of the following represents the permanganate ion?
\[\ce{MnO^-2}\]
\[\ce{MnO^-3}\]
\[\ce{MnO^-4}\]
\[\ce{MnO^-}\]
What do you mean by analytical chemistry?
Explain the significance of analytical chemistry.
Differentiate between qualitative and quantitative analysis.
Define the term chemical reagent.
What do you understand by precipitation reaction? Explain with examples.
What happens when sodium hydroxide is added to a metallic salt solution? Give the equations involved.
Why some metallic hydroxides are soluble in excess of ammonium hydroxide? Explain with a reaction involved.
Name the metal hydroxides which are :
(a) Insoluble (b) Soluble in
(i) Caustic soda solution (ii) Ammonium hydroxide solution.
What happens when sodium hydroxide is added in excess to zinc sulphate solution?
Why does no precipitation occur on the addition of ammonium hydroxide to calcium salt solution?
How will you distinguish NH4OH solution from NaOH solution?
How is the tetraamminecopper(II) hydroxide complex formed in the reaction of copper salt with NH4OH?
TEST YOUR UNDERSTANDING - 2
State whether the following statement is True or False.
Hydrogen gas is evolved when magnesium metal reacts with NaOH.
State whether the following statement is True or False.
Aluminium metal in reaction with aqueous solution of caustic potash gives potassium meta aluminate.
State whether the following statement is True or False.
Magnesium hydroxide is amphoteric in nature since it reacts with both acids and bases.
Fill in the following blanks with suitable answers.
Metals on reaction with alkalis form ______ and ______.
Zn(OH)2 + NaOH → ______ + H2O
Sodium oxide is ______ in nature.
Choose the correct option for each of the following questions.
Which of the following metal oxide is an amphoteric oxide?
Zn
Pb
Fe
Both Zn and Pb
The chemical formula for sodium zincate is ______.
Na3ZnO4
Na2ZnO2
NaZnO2
None of these
Amphoteric oxides are ______.
acidic
basic
neutral
Both acidic and basic
Oxides and hydroxides of metals neutralise acids. Why?
Write the balanced chemical equation for the action of aqueous NaOH on aluminium metal.
What happens when sodium oxide is dissolved in water?
What do you observe when a solution of potassium hydroxide is added to lead? Give balanced chemical equations.
How will you distinguish between copper and magnesium hydroxide using NH4OН?
Discuss the chemical nature of metal oxides and hydroxides.
Give reactions to support the amphoteric nature of zinc.
Lakhmir Singh solutions for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई 4 Analytical Chemistry EXERCISE [Pages 88 - 91]
Objective Questions
True or False.
Copper metal salt forms chalky white precipitate with caustic soda.
True or False.
The dichromate ion is represented by \[\ce{CrO^{2-}4}\].
True or False.
Salts of group 3 to 12 are generally colourless.
True or False.
Most metal oxides are basic in nature.
True or False.
A white gelatinous precipitate is obtained when sodium hydroxide solution is added to lead nitrate.
Fill in the Blanks
Manganese ion is ______ in colour.
______ sulphate forms pale blue precipitate on reaction with ammonium hydroxide.
Pb(OH)2 + NaOH → ______ + H2O
Nitrogen content in a fertiliser can be obtained by ______ analysis.
Multiple Choice Questions
Which ofthe following precipitates is of red brown colour?
Fe(OH)3
Cu(OH)3
Fe(OH)2
Cu(OH)2
The metal which does not form amphoteric oxide is ______.
lead
zinc
aluminum
calcium
Cu(OH)2 is soluble in excess of ______.
NaOH
NH4OH
Both NaOH and NH4OH
None of these
NaOH reacts with acid to form ______.
salt and base
salt and water
salt and acid
only salt
Zinc oxide on reaction with NaOH forms ______.
sodium zincate
zinc hydroxide
sodium oxide
does not react
Which of the following forms a dirty green precipitate on reaction with caustic soda?
CuSO4
MgSO4
FeSO4
PbSO4
Match the following columns and choose the correct option.
| Column I | Column II |
| (p) Cupric ion | (i) Pink |
| (q) Manganese ion | (ii) Blue |
| (r) Nickel ion | (iii) Yellow |
| (s) Ferric ion | (iv) Green |
(p) - (ii), (q) - (i), (r) – (iv), (s) - (iii)
(p) - (iii), (q) - (i), (r) - (iv), (s) - (ii)
(p) - (i), (q) - (ii), (r) - (iv), (s) - (iii)
(p) - (iv), (q) - (i), (r) - (ii), (s) - (iii)
Match the following columns and choose the correct option.
| Column I | Column II |
| (p) Metal oxide | (i) Acidic |
| (q) Non-metal oxides | (ii) Acidic and basic |
| (r) Amphoteric oxides | (iii) Basic |
(p) - (ii), (q) - (i), (r) - (iii)
(p) - (iii), (q) - (i), (r) - (ii)
(p) - (ii), (q) - (iii), (r) - (i)
(p) - (iii), (q) - (ii), (r) - (i)
Sodium hydroxide 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 |
| (i) Pb2+ | A. Reddish brown |
| (ii) Fe2+ | B. White insoluble in excess |
| (iii) Zn2+ | C. Dirty green |
| (iv) Fe3+ | D. White soluble in excess |
| (v) Cu2+ | E. White soluble in excess |
| (vi) Ca2+ | F. Blue |
(i) - (D), (ii) - (C), (iii) - (E), (iv) - (A), (v) - (F), (vi) - (B)
(i) - (A), (ii) - (D), (iii) - (E), (iv) - (B), (v) - (F), (vi) - (C)
(i) - (B), (ii) - (C), (iii) - (E), (iv) - (A), (v) - (F), (vi) - (D)
(i) - (B), (ii) - (C), (iii) - (F), (iv) - (E), (v) - (A), (iv) - (D)
Match the gases given in column I to the identification of the gases mentioned in column II.
| Column I | Column II |
| (i) Hydrogen sulphide | A. Turns acidified potassium dichromate solution green. |
| (ii) Nitric oxide | B. Turns lime water milky. |
| (iii) Carbon dioxide | C. Turns reddish brown when it reacts with oxygen. |
| (iv) Sulphur dioxide | D. Turns moist lead acetate paper silvery black. |
(i) - (B), (ii) - (C), (iii) - (D), (iv) - (A)
(i) - (A), (ii) - (D), (iii) - (C), (iv) - (B)
(i) - (D), (ii) - (C), (iii) - (B), (iv) - (A)
(i) - (A), (ii) - (B), (iii) - (D), (iv) - (C)
The colour of the precipitate formed after the addition of a small amount of sodium hydroxide solution to an aqueous solution of ferric chloride is ______.
gelatinous white
pale blue
reddish brown
dirty green
Aqueous solution of cupric chloride forms a deep blue solution on addition of ______.
dropwise sodium hydroxide
excess sodium hydroxide
dropwise ammonium hydroxide
excess ammonium hydroxide
Descriptive Questions Short Answer Questions
Write the probable colour of the following salt:
Cupric salts
Write the probable colour of the following salt:
Aluminium Salts
Write the probable colour of the following salt:
Calcium salts
Write the probable colour of the following salt:
Ammonium salts
Name two colourless metal ions.
Name two coloured metal ions.
Name a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
CuSO4
Write a balanced equation for this reaction.
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
ZnSO4
Write a balanced equation for this reaction.
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
FeCl3
Write a balanced equation for this reaction.
There are two bottles X and Y. One bottle has ammonium hydroxide, whereas the other has sodium hydroxide. How will you differentiate both?
How is the tetraamminezinc(II) hydroxide complex formed?
Give a test to distinguish between lead carbonate and zinc carbonate solution?
On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate, however, dissolves on addition of excess of ammonia solution. Identify (Choose from Na, Al, Zn, Pb, Fe).
- Which metal salt solution was used?
- What is the formula of the white gelatinous precipitate obtained?
Write the balanced chemical equation for the addition of sodium hydroxide in excess to an ammonium salt solution.
What do you observe when freshly precipitated aluminium hydroxide reacts with caustic soda solution? Give a balanced equation.
Distinguish between the following (using ammonia solution):
Ferric salt and ferrous salt
Distinguish between the following metal salt solutions.
Calcium and lead salts
Distinguish between the following metal salt solutions.
Zinc and lead salts
Distinguish between the following metal salt solutions.
Iron and copper salts
Give one chemical test to distinguish between the following pair of compounds:
Zinc sulphate solution and Zinc chloride solution
Give one chemical test to distinguish between the following pair of compounds:
Iron (II) chloride solution and iron (III) chloride solution
Give one chemical test to distinguish between the following pair of compounds.
Calcium nitrate solution and calcium chloride solution
State two relevant observation of the following:
Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess
State two relevant observations of the following:
Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.
State two observations when
Lead nitrate crystals are heated in a hard glass test tube.
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to the following solution:
Copper sulphate solution
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to the following solution:
Zinc sulphate solution
Answer the following questions:
How will you distinguish between Ammonium hydroxide and Sodium hydroxide using copper sulphate solution?
How will you distinguished between dilute HCl and dilute H2SO4 using lead nitrate solution?
Complete the following by selecting the correct option from the choices given:
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
Al
Cu
Zn
Fe
Complete the following by selecting the correct option from the choices given :
The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ________
Fe
Mg
Pb
Al
The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is ______.
Al
Na
Mg
K
Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation :
2NaOH + CuSO4 → Na2SO4 + Cu (OH)2 ↓
(i) What mass of copper hydroxide is precipitated by using 200 gm of sodium hydroxide?
[H = 1, O = 16, Na = 23, S = 32, Cu = 64]
(ii) What is the colour of the precipitate formed?
Give one test to distinguish between the following pair of chemicals.
Zinc nitrate solution and calcium nitrate solution
Distinguish by a chemical test, ammonium sulphate and sodium sulphate.
Distinguish by a chemical test, magnesium chloride and magnesium nitrate solutions.
Write balanced chemical equation for the preparation of the given salts (a) to (c) by using the method A to C respectively:
A: Neutralisation
B: Precipitation
C: Titration
- Copper sulphate
- Zinc carbonate
- Ammonium sulphate
Identify the salt P from the following observation.
Salt P has a light bluish green colour. On heating, it produces a black-coloured residue. Salt P produces brisk effervescence with dil. HCl and the gas evolved turn lime water milky, but there is no action with acidified potassium dichromate solution.
Identify the salt Q from the following observation.
Salt Q is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas solution ofsalt Q produces a chalky white insoluble precipitate with excess of ammonium hydroxide.
Identify the salt R from the following observation.
Salt R is black in colour. On reacting with concentrated HCl, it liberates a pungent greenish yellow gas which turns moist starch iodide paper blue-black.
Long Answer Questions
Give a reason for the following:
Pale blue colour is obtained on adding ammonium hydroxide solution to copper sulphate.
Give a reason for the following:
Some precipitated metal hydroxides are soluble in excess of ammonium hydroxide.
Give a reason for the following:
Zinc oxide reacts with both acid and base.
Give a reason for the following:
With calcium salts no precipitation is observed on adding excess of ammonium hydroxide.
Choose the most appropriate answer from the following list of oxides which fit the description.
[SO2, SiO2, Al2O3, MgO, CO, Na2O]
A basic oxide.
Choose the most appropriate answer from the following list of oxides which fit the description.
[SO2, SiO2, Al2O3, MgO, CO, Na2O]
An oxide which dissolves in water forming an acid
Choose the most appropriate answer from the following list of oxides which fit the description.
[SO2, SiO2, Al2O3, MgO, CO, Na2O]
An amphoteric oxide
Choose the most appropriate answer from the following list of oxides which fit the description.
A covalent oxide of a metalloid.
SO2
SiO2
Al2O3
MgO
CO
Na2O
The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present
|
Chemical Test |
Observation | Conclusion |
| To Solution X, ammonium hydroxide is added in minium quantity first and then in excess | A dirty white precipitate is formed which dissolves in excess to form a clear solution | (i) |
| To Solution Y, ammonium hydroxide is added in minimum quantity first and then in excess | A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution | (ii) |
| To solution W, A small quantity of sodium hydroxide solution is added and then in excess | A white precipitate is formed which remains insoluble | (iii) |
| To a salt Z, calcium hydroxide solution is added and then heated | A pungent smelling gas turning moist red litmus paper blue is obtained | (iv) |
Solutions for 4: Analytical Chemistry
Lakhmir Singh solutions for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई chapter 4 - Analytical Chemistry
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