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1.	A gas, A obtained by heating aluminum with sodium hydroxide was passed over a black solid, B at 773K when a grey metal, C and a colourless liquid, D were obtained. The metal C displaces copper from copper sulphate solution and becomes passive on treatment with cone. IINO3. Identity A, B, C and D and explain all the reactions.
Answer» (i) 2Al(s) + 2NaOH(aq) + 2H2O(l) → 2NaAlO2(aq) + 3H2(g) Dihydrogen(A) (ii) Fe3O4(s) {Black solid(B)} + 4H2(g)\(\overset{773\,K}{\longrightarrow}\)3Fe(s) Grey metal(C) + 4H2O Water(D) (iii) Fe(s) + CuSO4(aq) → FeSO4(sq) + Cu(s) (iv) 3Fe(s) + 8IINO3(sq)→ FeO.Fe2O3(s) {Ferrosoferri oxide(B)} + 8NO2(g) + 4H2O(l) Iron is rendered passive due to the formation of ferrosoferric oxide or magnetic oxide {black solid (B)}

A gas, A obtained by heating aluminum with sodium hydroxide was passed over a black solid, B at 773K when a grey metal, C and a colourless liquid, D were obtained. The metal C displaces copper from copper sulphate solution and becomes passive on treatment with cone. IINO3. Identity A, B, C and D and explain all the reactions.

Answer»

(i) 2Al(s) + 2NaOH(aq) + 2H2O(l) → 2NaAlO2(aq) + 3H2(g) Dihydrogen(A)

(ii) Fe3O4(s) {Black solid(B)} + 4H2(g)\(\overset{773\,K}{\longrightarrow}\)3Fe(s) Grey metal(C) + 4H2O Water(D)

(iii) Fe(s) + CuSO4(aq) → FeSO4(sq) + Cu(s)

(iv) 3Fe(s) + 8IINO3(sq)→ FeO.Fe2O3(s) {Ferrosoferri oxide(B)} + 8NO2(g) + 4H2O(l)

Iron is rendered passive due to the formation of ferrosoferric oxide or magnetic oxide {black solid (B)}

Discussion

2.	The mixture of hydrazine and hydrogen peroxide with copper (II) catalyst is used as a rocket propellant. Why? Write the reactions involved.
Answer» When hydrazine and hydrogen peroxide react in presence of Cu2+ Catalyst the following reaction is takes place. Since the formation of nitrogen and steam is accompanied with evolution of large amount of heat thus act as a rocket propellant.

The mixture of hydrazine and hydrogen peroxide with copper (II) catalyst is used as a rocket propellant. Why? Write the reactions involved.

Answer»

When hydrazine and hydrogen peroxide react in presence of Cu2+ Catalyst the following reaction is takes place.

Since the formation of nitrogen and steam is accompanied with evolution of large amount of heat thus act as a rocket propellant.

Discussion