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```STOICHIOMETRY - 1
Page # 131
26. â2Vâ ml of 1 M Na2 SO4 is mixed with âVâ ml of 2M
Ba(NO3 )2 solution.
Sol.
(A) Molarity of Na+ ion in final solution canât be
calculated as V is not known.
(B) Molarity of BaSO4 in final solution is
2
M
3
4
(C) Molarity of NO3â in final solution is M
3
(D) Molarity of NOâ3 in final solution is
2
M
3
Sol.
29. Column I
Column II
(A) 10 M MgO
(dsol = 1.20 gm/ml)
(P) W solvent = 120 gm
per 100 ml of solution.
Solute: MgO, Solvent:H2 O
(B) 40% w/v NaOH
(dsol. = 1.6 gm/ml)
(Q) W sol = 150 gm
per 100 gm solvent
Solute:NaOH,Solvent:H2 O
(C) 8 m CaCO3
(R) Wsolute = 120 gm per
Solute:CaCO3 ,Solvent:H 2O
(D) 0.6 mol fraction of âXâ
(molecular mass = 20)
100 gm of solvent
(S) W solvent = 125 gm
per 100 gm of solute
in âYâ (molecular mass 25)
Solute : X, Solvent : Y
Match the Column
27.
Sol.
One type of artifical diamond (commonly called
YAG for yttrium aluminium garnet) can be
represented by the formula Y3 Al 5O 12 [Y = 89, Al
= 27]
Column I
Column II
Element
Weight percentage
(A) Y
(P)
(B) Al
(Q) 32.32 %
22.73 %
(C) O
(R)
44.95 %
Sol.
30.
Bunty & Bubbly have two separate containers
one having N 2 gas & other H2 gas : It is known
that N 2 & H2 react to give N 2H2(l) and/or N 2 H4
(g) depending upon the ratio in which N 2 & H2
are taken & that N 2 H2 reacts with H 2 to give
N 2H4 . Formation of 1 mole of N2 H4 requires 30
units of energy & formation of 1 mole of N 2 H2 (l)
release 30 units of energy. From this information
match Column I (representing composition of
gases taken) with Column II (representing the
observation)
Column I
28.
The recommended daily dose is 17.6 milligrams
of vitamin C (ascorbic acid) having formula
C6H8O 6.
Match the following. Given : NA = 6 Ã 10 23
Column I
Column II
(A)
O-atoms present
(B)
Moles of vitamin C in 1gm (Q) 5.68 Ã 10 â3
(C)
of vitamin C
Moles of vitamin C in 1gm (R) 3.6 Ã 1020
should be consumed daily
(P) 10 â4 mole
Column II
(Composition of gases)(Observation)
(A) 40 lit N 2 & 30 lit H2
(P) Contraction by 22.4 lit
(same tem perature &
pressure)
(B) 11.2 lit of N2 & H2
(Q) Contraction by 20 lit.
taken at 1 atm & 273 K
in a ratio such that max.
release of energy
is observed
(C) 11.2 lit of N2 & 30 lit (R) Contraction by 60 lit
of H2 (same temperature
& pressure)
(D) 10 lit of N2 & more
than 22.4 lit of H 2
(S) Contraction by 11.2 lit
(same temperature &
pressure)
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```
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