Analytical Chemistry Long Ans Concise Class-10 ICSE Chemistry Selina Solutions Chapter-4. We Provide Step by Step Answer of Long Ans 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 Long Ans 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 | Long Ans |
| Edition | 2025-2026 |
Long Ans Questions on Analytical Chemistry
Page: 70
Que-1: You are provided with two reagent bottles marked A and B. One of which contains NH4OH solution and the other contains NaOH solution. How will you identify them by a chemical test?
Ans: Reagent bottles A and B can identified by using calcium salts such as Ca(NO3)2.
On adding NaOH to Ca (NO3)2, Ca (OH) 2 is precipitated as white precipitate which is sparingly soluble in excess of NaOH.
Ca(NO3)2+2NaOHCa(OH)2+2NaNO3
Whereas, on addition of NH4OH to calcium salts, no precipitation of Ca(OH)2 occurs even with addition of excess of NH4OH because the concentration of OH–ions from the ionization of NH4OH is so low that it cannot precipitate the hydroxide of calcium.
So the reagent bottle which gives white precipitate is NaOH and the other is NH4OH.
Que-2: Write the balanced equations for the following conversions:
Ans:
Que-3:
(a) What do you understand by amphoteric oxide?
(b) Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali.
(c) Name the products formed.
Ans:
(a) Amphoteric oxides are compounds which react with both acids and alkalis to form salt and water.
(b) ZnO+ 2NaOH → Na2ZnO2 + H2O
Al2O3 + 2NaOH → 2NaAlO2 + H2O
(c) Sodium zincate
Aluminium zincate
Que-4: 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.
(a) From the following list, identify which metal salt solution was used above?
Na, Al, Zn, Pb, Fe
(b) What is the formula of the white gelatinous precipitate obtained?
(c) Give the balanced equation(s) when sulphate of this metal reacts with ammonia solution in excess.
Ans:
(a) Zinc (Zn) metal salt solution was used
(b) Zn(OH)2
(c) The balanced equations are given below:
ZnSO4 + 2NH4OH –> Zn(OH)2 ↓ + (NH4)2 SO4
With excess of NH4OH ppt. dissolves
Zn(OH)2 + (NH4)2SO4 + 2NH4OH –> [ (Zn(NH3)4)]SO4 + 4H2O
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