Chemical Changes and Reactions Exe-2C Structured Answer Chemistry Class-9 ICSE Selina Publishers

Chemical Changes and Reactions Exe-2C Structured Answer Chemistry Class-9 ICSE Selina Publishers Solutions Chapter-2. Step By Step ICSE Selina Concise Solutions of Chapter-2 Chemical Changes and Reactions with All Exercise including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type, Numerical and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.

Chemical Changes and Reactions Exe-2C Structured Answer Chemistry Class-9 ICSE Concise Selina Publishers

Board ICSE
Publications Selina Publication
Subject Chemistry
Class 9th
Chapter-2 Chemical Changes and Reactions
Book Name Concise
Topics Solution of Exercise – (2C) Structured/Skill Answer Type
Academic Session 2023-2024

E. Exercise – (2C) Structured/Skill  Answer Type

Chemical Changes and Reactions Class-9 Chemistry Concise Solutions  

Page 34

Question 1.

Question 1.

K, Na, Ca, Mg, Al, Zn, Fe, Pb, Cu, H, Hg, Ag

Pick an element from the reactivity series given above and write the equations for the the following:

(a) Metal hydroxide on heating forms metal oxide and water vapour.

(b) Metal hydroxide on heating forms metal, oxygen and water vapours.

(c) Metal nitrate decomposes to give two products only.

(d) Metal nitrate on heating forms metal oxide, nitrogen dioxide and oxygen.

(e) Metal nitrate on heating forms metal, nitrogen dioxide and oxygen.

(f) Metal carbonate which is stable to heat.

(g) Metal carbonate which forms metal oxide and carbon dioxide on heating.

(h) The heating effect on bivalent metal hydrogen carbonate.

Answer:

(a) Metal hydroxide on heating forms metal oxide and water vapour — Calcium hydroxide

Ca(OH)2 →Δ​ CaO + H2O

(b) Metal hydroxide on heating forms metal, oxygen and water vapours — silver hydroxide

4AgOH →Δ​ 4Ag + O2 + 2H2O

(c) Metal nitrate decomposes to give two products only — potassium nitrate

2KNO3 →Δ​ 2KNO2 + O2 ↑

(d) Metal nitrate on heating forms metal oxide, nitrogen dioxide and oxygen — Lead nitrate

2Pb(NO3)2 →Δ​ 2PbO + 4NO2 + O2 ↑

(e) Metal nitrate on heating forms metal, nitrogen dioxide and oxygen — Silver nitrate

2AgNO3 →Δ​ 2Ag + 2NO2 + O2 ↑

(f) Metal carbonate which is stable to heat — Potassium carbonate

Potassium carbonate is stable to heat

(g) Metal carbonate which forms metal oxide and carbon dioxide on heating — Magnesium carbonate

MgCO3 →Δ​ MgO + CO2 ↑

(h) The heating effect on bivalent metal hydrogen carbonate — Magnesium bicarbonate

Mg(HCO3)2 →Δ​ MgCO3 + H2O + CO2 ↑

Question 2.

KI + Cl2 ⟶ KCl + I2

(a) Balance the equation given above.

(b) Which type of reaction is it ?

(c) Which element is more reactive ?

(d) What will be the product formed if KCl reacts with I2 ?

Answer:

(a) 2KI + Cl2 ⟶ 2KCI + I2

(b) Displacement reaction

(c) Chlorine

(d) No reaction, because Iodine being less reactive than chlorine will not be able to displace chlorine from KCl.

—  : End of Chemical Changes and Reactions Exe-2C Structured/Skill Answer Class-9 ICSE Chemistry Solutions :–

Return to  Return to Concise Selina ICSE Chemistry Class-9 

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