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Yashi Mishra
Subject: Chemistry
, asked on 31/3/18
Plz solve the question giving logics.
Q44. The reaction of hydrogen and iodine monochloride is given as
H
2
(g)
+ 21Cl
(g)
→
2HCl
(g)
+ l
2
(g)
This reaction is of first order with respect to H
2
(g)
and lCl
(g)
, following mechanisms were proposed
Mechanism A:
H
2
(g)
+ 21Cl
(g)
→
2HCl
(g)
+ l
2
(g)
Mechanism B:
H
2
(g)
+ lCl
(g)
→
HCl
(g)
+ Hl
(g)
; slow
Hl
(g)
+ lCl
(g)
→
HCl
(g)
+ l
2
(g)
; fast
Which of the above mechanism (s) can be consistent with the given information about the reaction?
(1) A and B both (2) Neither A nor B
(3) A only (4) B only
Answer
1
Yashi Mishra
Subject: Chemistry
, asked on 31/3/18
15. In Arrhenius equation,
k
=
A
e
E
a
R
T
, A may not be termed as rate constant
1. When 100% reactant will convert into the product
2. When the temperature becomes infinite
3. When the fraction of molecule crossing over the energy barrier becomes unity.
4. At very low temperature
Answer
2
Kevan Mehta
Subject: Chemistry
, asked on 29/3/18
The priority of groups — OH, — COOH, — CHO & —
O
C
H
3
attached to chiral carbon is
in order :
Answer
1
Rupal Sahu
Subject: Chemistry
, asked on 25/3/18
Solve this:
Answer
1
Rayyan Mansuri
Subject: Chemistry
, asked on 24/3/18
Please answer this with explanation.q11:
11 For the reaction
2
N
2
O
5
⇌
4
N
O
2
+
O
2
concentration of NO
2
increases by 5.2 x 10
-3
M in 100 seconds. The rate of reaction = ..................
A
1
.
3
×
10
-
5
M
s
-
1
B
2
.
6
×
10
-
4
M
s
-
1
C
7
.
6
×
10
-
4
M
s
-
1
D
1
.
04
×
10
-
3
M
s
-
1
Answer
1
Rayyan Mansuri
Subject: Chemistry
, asked on 24/3/18
Solve this with explanation :
3
.
Reaction
:
2
A
+
B
→
C
is
elementary
and
slow
stage
.
In
the
beginning
reaction
is
done
taking
3
moles
of
A
and
2
moles
of
B
.
When
1
mole
of
C
is
produced
,
what
will
be
the
reaction
rate
compared
to
initial
rate
?
(
a
)
27
4
(
b
)
1
18
(
c
)
1
9
(
d
)
9
1
Answer
1
Rayyan Mansuri
Subject: Chemistry
, asked on 24/3/18
lease answer this with explanation ignore blue pen and solve.q1
1.
For the reaction N
2
(g)
+ 3H
2
(g)
⇔
2NH
3
, the rate of
consumption of H
2
is 2.4 x 10
-2
. Hence the rate of
formation of NH
3
is „
(A)1.6 x 10
—2
(C) 9.0 x 10
-3
(B) 3.6 x 10
-2
(D) 4.8 10
-2
Answer
1
Rayyan Mansuri
Subject: Chemistry
, asked on 24/3/18
In this page how did rate = K1(H2)(Br2)1/2 /1+K2 (HBr/Br2) came as i dont get that step....
Answer
1
Rayyan Mansuri
Subject: Chemistry
, asked on 24/3/18
Please answer this with explanation.
Answer
1
Vanshika Sharma
Subject: Chemistry
, asked on 22/3/18
If a certain mass of gas is made to undergo separately adiabatic and isothermally expansion to the same pressure, standing from the same initial condition of temperature and pressure , then, as compared to that of isothermal expansion, in the case of adiabatic expansion the final.
(A) Volume and temperature will be higher.
(B) Volume and temperature will be lower.
(C) temperature will be lower but the final volume will be higher
(D) volume will be lower but the final temperature will be higher.
Answer
1
Shubhrajyoti Ghosh
Subject: Chemistry
, asked on 19/3/18
Q. An aqueous solution of a non volatile non electrolyte freezes at — 0.186
°
C. Determine
the elevation of boiling point of the same solution. [Given,
K
f
of water= 1.86 K. Kg.
m
o
l
-
1
K
b
of water 0.512 k.Kg.
m
o
l
-
1
]
Answer
1
Shubhrajyoti Ghosh
Subject: Chemistry
, asked on 15/3/18
No links please
Q. Calculate the cell constant and specific conductance of 0.01 (M) KCl solution having molar 2 conductance 120
o
h
m
-
1
c
m
2
m
o
l
-
1
resistance equal to 476 ohm.
Answer
1
Shubhrajyoti Ghosh
Subject: Chemistry
, asked on 15/3/18
No links please
Q.(ii) Copper crystallises in face centred cubic lattice. Calculate the number of unit cells in 1.2 gm of copper (Atomic mass of Cu = 63.5).
Answer
1
Rayyan Mansuri
Subject: Chemistry
, asked on 14/3/18
please answer question no. 8
8) For the reaction
2
A
+
B
→
p
r
o
d
u
c
t
,
-
d
A
d
t
=
K
A
2
B
What will be the rate equation for
-
d
B
d
t
?
(
A
)
1
2
K
A
2
B
(
B
)
K
A
B
2
(
C
)
K
2
A
2
B
(
D
)
K
A
B
1
2
Answer
3
Anushka Ranaut
Subject: Chemistry
, asked on 13/3/18
The rate of formation of an N2O5 is 2.8 ? 10^-3 moles per second. Calculate the rate of disappearance of N2O5.
Answer
1
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What are you looking for?
Q44. The reaction of hydrogen and iodine monochloride is given as
H2(g) + 21Cl(g) 2HCl(g) + l2(g)
This reaction is of first order with respect to H2(g) and lCl(g), following mechanisms were proposed
Mechanism A:
H2(g) + 21Cl(g) 2HCl(g) + l2(g)
Mechanism B:
H2(g) + lCl(g) HCl(g) + Hl(g) ; slow
Hl(g) + lCl(g) HCl(g) + l2(g) ; fast
Which of the above mechanism (s) can be consistent with the given information about the reaction?
(1) A and B both (2) Neither A nor B
(3) A only (4) B only
1. When 100% reactant will convert into the product
2. When the temperature becomes infinite
3. When the fraction of molecule crossing over the energy barrier becomes unity.
4. At very low temperature
in order :
11 For the reaction concentration of NO2 increases by 5.2 x 10-3 M in 100 seconds. The rate of reaction = ..................
1.For the reaction N2(g) + 3H2(g) 2NH3 , the rate of
consumption of H2 is 2.4 x 10-2. Hence the rate of
formation of NH3 is „
(A)1.6 x 10—2
(C) 9.0 x 10-3
(B) 3.6 x 10-2
(D) 4.8 10-2
(A) Volume and temperature will be higher.
(B) Volume and temperature will be lower.
(C) temperature will be lower but the final volume will be higher
(D) volume will be lower but the final temperature will be higher.
Q. An aqueous solution of a non volatile non electrolyte freezes at — 0.186C. Determine
the elevation of boiling point of the same solution. [Given, of water= 1.86 K. Kg.
of water 0.512 k.Kg.]
Q. Calculate the cell constant and specific conductance of 0.01 (M) KCl solution having molar 2 conductance 120 resistance equal to 476 ohm.
Q.(ii) Copper crystallises in face centred cubic lattice. Calculate the number of unit cells in 1.2 gm of copper (Atomic mass of Cu = 63.5).
8) For the reaction
What will be the rate equation for