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Page # 132
STOICHIOMETRY - 1
Sol.
COMPREHENSION
32. A 4.925 g sample of a mixture of CuCl2 and CuBr2
was dissolved in water and mixed thoroughly with
a
5.74 g portion of AgCl. After the reaction the
solid, a mixture of AgCl, and AgBr, was filtered,
washed, and dried. Its mass was found to be
6.63 g.
(a) % By mass of CuBr2 in original mixture is
31.
(A) 2.24
(C) 45.3
Br2 reacts with O 2 in either of the following ways
depending upon supply of O2.
Br2 +
1
2
O2
Br2 O , Br2
3
2
O2
(b) % By mass of Cu in original mixture is
(A) 38.68
(C) 3.86
Br2 O3
Column II
(Initial reactants)
(Final product)
(A) 320 gm Br2 is mixed
with 64 gm of O 2
(P) 1 mole Br2 O3
(B) 160 gm Br2 is mixed
(Q)
1
mole (Br2 O),
2
1
with 8 gm of O 2
2
(R) 1 mole (Br2 O), 1 32
mole (Br2O3)
(D) 160 gm Br2 is mixed with
(S)
Sol.
(A) 25
(B) 50
(C) 75
(D) 60
(d) No. of moles of Cl – ion present in the
solution after precipitation are
(A) 0.06
(C) 0.04
(B) 0.02
(D) None
Sol.
mole (Br2 )
(C) 80 gm Br2 is mixed with
gm of O 2
48 gm of O2
(B) 19.05
(D) None
(c) % by mole of AgBr in dried precipitate is
Match composition of the final mixture for initial
amount of reactants.
Column I
(B) 74.5
(D) None
1
mole (Br2 O3),
2
1
mole (O2 )
4
33.
Na Br, u sed t o pr o duce AgBr fo r us e i n
photography can be self prepared as follows :
Fe + Br2
FeBr2
FeBr2 + Br2
Fe3Br 8
Fe3 Br8 + Na2CO 3
...(i)
...(ii) (not balanced)
NaBr + CO2 + Fe3O4 ...(iii)
(not balanced)
(a) Mass of iron required to produce 2.06 × 10 3
kg NaBr
(A) 420 gm
(B) 420 kg
(C) 4.2 × 10 kg
5
(D) 4.2 × 10 8 gm
(b) If the yield of (ii) is 60% & (iii) reaction is
70% then mass of iron required to produce 2.06
× 10 3 kg NaBr
(A) 105kg
(B) 105 gm
(C) 10 3 kg
(D) None
(c) If yield of (iii) reaction is 90% then mole of
CO 2 formed when 2.06 × 103 gm NaBr is formed :
(A) 20
(C) 40
(B) 10
(D) None
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