Question

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

NCERT Class X
Science - Exemplar Problems

Chapter_Chemical Reactions And Equations

Answer 1

Explanation:

(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

$Fe_2O_3(s)+2Al\rightarrow Al_2O_3(s)+2Fe(l)$

Single displacement reaction: Position of one element is exchanged by an other element from its compound.

(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.

$3Mg(s)+N_2\rightarrow Mg_3N_2$

Combination reaction: Two of the reactants are combining together to give single product.

(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.

$Cl_2(g)+2KI(aq)\rightarrow 2KCl(aq)+I_2(s)$

Single displacement reaction

(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

$C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O+heat$

Combustion reaction: Burning of organic compound in the presence of oxygen to give heat, water and carbon-dioxide.

Answer 2

(a) In Thermite reaction, iron (11) oxide reacts with aluminium and gives molten iron and aluminium oxide.

(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride

(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.

(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

(a) Fe2O3(s) + 2Al(s) ⎯→ Al2O3(s) + 2Fe(l) + Heat Displacement reaction/Redox reaction

(b) 3Mg(s) + N2(g) ⎯→ Mg3N2(s) Combination reaction

(c) 2KI(aq) +Cl2(g) ⎯→ 2KCl(aq) + I2(s) Displacement reaction

(d) C2H5OH(l) + 3O2(g) ⎯→ 2CO2(g) + 3H2O(l) + Heat Redox reaction/Combustionreaction

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