Analytical Chemistry Intex-1 Concise Class-10 ICSE Chemistry Selina Solutions Chapter-4. We Provide Step by Step Answer of Intex-1 Questions of Exercise-4 for ICSE Class-10. The given Solutions is according to the Latest editions. Visit official Website CISCE for detail information about ICSE Board Class-10.
Analytical Chemistry Intex-1 Concise Class-10 ICSE Chemistry Selina Solutions Chapter-4
| Board | ICSE |
| Book / Publication | Concise / Selina |
| Subject | Chemistry |
| Class | 10th |
| Writer | Dr SP Singh |
| Chapter-4 | Analytical Chemistry |
| Topics | Intex-1 |
| Edition | 2025-2026 |
Intex-1 Questions on Analytical Chemistry
Que-1: What do you understand by the following:
(i) Analysis,
(ii) Qualitative analysis,
(iii) Reagent,
(iv) Precipitation?
Ans:
(i) Analysis: The determination of chemical components in a given sample is called analysis.
(ii) Qualitative analysis: The analysis which involves the identification of the unknown substances in a given sample is called qualitative analysis.
(iii) Reagent: A reagent is a substance that reacts with another substance.
(iv) Precipitation: It is the process of formation of an insoluble solid when solutions are mixed. The solid thus formed is called precipitate.
Que-2: Write the probable colour of the following salts:
(i) Iron (III) chloride,
(ii) Potassium nitrate,
(iii) Ferrous sulphate,
(iv) Aluminum acetate,
Ans:
(i) Yellow
(ii) Colourless
(iii) Pale Green
(iv) Colourless
Que-3: Name the probable cations present in the following observations:
(a) White precipitate insoluble in NH4OH but soluble in NaOH
(b) Blue-coloured solution
Ans:
(a) Pb2+
(b).Cu2+
Que-4: Name the metal hydroxides which are :
(i) Insoluble
(ii) Soluble
(a) Caustic soda solution
(b) Ammonium hydroxide solution.
Ans:
| Name of solution | Soluble metal hydroxides | Insoluble metal hydroxides |
| Caustic soda solution
|
Zn(OH)2 Pb(OH)2 |
Fe(OH)3 |
| Ammonium hydroxide solution | Zn(OH)2
Cu(OH)2 |
Fe(OH)3
Fe(OH)2 |
Que-5: What do you observe when an ammonium salt is heated with caustic soda solution? Write the word equation.
Ans: When ammonium salt is heated with caustic soda solution, ammonia gas is evolved.
The word equation is:
Ammonium chloride + Sodium hydroxide –> Sodium chloride + water + ammonia
Ammonium sulphate + Sodium hydroxide –> Sodium sulphate + water + ammonia
The balance equation is:
NH4Cl+NaOH –> NaCl+H2O+NH3↑
(NH4)2SO4 + 2NaOH –> Na2SO4 + 2H2O + 2NH3↑
Que-6: How will you distinguish NH4OH solution from NaOH solution?
Ans: NH4OH and NaOH can be distinguished by using calcium salts.
For example on adding NaOH to Ca(NO3)2, Ca(OH)2 is obtained as white precipitate which is sparingly soluble in excess of NaOH.
Ca(NO3)2+2NaOHCa(OH)2+2NaNO3
On addition of NH4OH to calcium salts, no precipitation of Ca(OH)2 occurs even with the addition of excess of NH4OH.This is because the concentration of OH– ions from the ionization of NH4OH is so low that it cannot precipitate the hydroxide of calcium.
Que-7: Why is an alkali added drop by drop to the salt solution?
Ans: If an alkali is added too quickly, then it is easy to miss a precipitate which redissolves in excess alkali.
Que-8: Write balanced equations:
(a) Reaction of sodium hydroxide solution with iron (III) chloride solution.
(b) Copper sulphate solution with ammonium hydroxide solution.
Ans:
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