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STOICHIOMETRY - 1
8.
Page # 121
Equal volumes of 10% (v/v) of HCl is mixed with
10% (v/v) NaOH solution. If density of pure NaOH
is 1.5 times that of pure HCl then the resultant
solution be :
(A) basic
(B) neutral
(C) acidic
11.
(D) can’t be predicted.
Sol.
9.
A definite amount of gaseous hydrocarbon was
burnt with just sufficient amount of O2 . The
volume of all reactants was 600 ml, after the
explosion the volume of the products [CO 2(g)
and H2 O(g)] was found to be 700 ml under the
similar conditions. The molecular formula of the
compound is :
(A) C3 H8
(B) C3 H6
(C) C3 H4
(D) C4 H10
One mole mixture of CH 4 & air (containing 80%
N 2 20% O 2 by volume) of a composition such
that when underwent combustion gave maximum
heat (assume combustion of only CH 4 ). Then
which of the statements are correct, regarding
composition of initial mixture. (X presents mole
fraction)
1
, XO2 =
2
8
(A) X CH 4
11
(B) X CH4
3
, XO2
8
1
, X N2
8
1
2
(C) X CH4
1
, X O2
6
1
, X N2
6
2
3
11
, X N2
11
(D) Data insufficient
Sol.
Sol.
12.
C6 H5OH(g) + O 2(g)
CO 2 (g) + H2O(l)
Magnitude of volume change if 30 ml of C 6H5OH
(g) is burnt with excess amount of oxygen, is
(A) 30 ml
(B) 60 ml
(C) 20 ml
(D) 10 ml
Sol.
10.
One gram of the silver salt of an organic dibasic
acid yields, on strong heating, 0.5934 g of silver.
If the weight percentage of carbon in it 8 times
the weight percentage of hydrogen and half the
weight percentage of oxygen, determine the
molecular formula of the acid. [Atomic weight of
Ag = 108]
(A) C4H6O 4
(B) C4 H6 O6
(C) C2H6O 2
(D) C5H10 O5
13.
Sol.
10 ml of a compound containing ‘N’ and ‘O’ is
mixed with 30 ml of H2 to produce H2O (l) and 10
ml of N2 (g). Molecular formula of compound if
both reactants reacts completely, is
(A) N2O
(B) NO2
(C) N2 O3
(D) N2O 5
Sol.
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