NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Royel Ghost
Subject: Chemistry
, asked on 14/5/18
please solve
QUESTION number 9..
T
h
e
s
o
l
u
b
i
l
i
t
y
P
b
l
2
a
t
25
°
C
i
s
0
.
7
g
L
-
1
.
T
h
e
s
o
l
u
b
i
l
i
t
y
p
r
o
d
u
c
t
o
f
P
b
l
2
a
t
t
h
i
s
t
e
m
p
e
r
a
t
u
r
e
i
s
M
o
l
a
r
m
a
s
s
o
f
P
b
l
2
=
461
.
2
g
m
o
l
-
1
A
.
1
.
40
×
10
-
9
B
.
14
.
0
×
10
-
9
C
.
0
.
14
×
10
-
9
D
.
140
×
10
-
9
Answer
1
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
76) The concentration of OH
-
ions in 0.050 M HNO
3
solution is. (Answer 1)
(
1
)
2
.
0
×
10
-
13
m
o
l
/
L
(
2
)
1
.
0
×
10
-
12
m
o
l
/
L
(
3
)
0
.
5
×
10
-
10
m
o
l
/
L
(
4
)
1
.
5
×
10
-
11
m
o
l
/
L
Answer
0
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
Explain qno.64.ans(3)
64. The acid dissociation constant of H
2
S and HS
-
are 10
-7
and 10
-13
respectively. The pH of 0.1 M aqeous solution of H
2
S will be
(1) 2 (2) 3
(3) 4 (4) 5
Answer
1
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
Explain qno.60 Ans(2):
60. 'a' moles of PCl
5
are heated in a closed container till equilibrium is established
PCl
5
(g)
⇌
PCl
3
(g) +Cl
2
(g)
at a pressure of P atm. If 'b' moles of PCl
5
dissociate at equilibrium, then
1
a
b
=
K
P
K
P
+
P
2
a
b
=
K
P
+
P
K
P
1
2
3
a
b
=
K
P
K
P
+
P
1
2
4
a
b
=
K
P
P
Answer
1
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
Explain qno.88 Ans(3)
Q.88. 5 moles of
C
H
3
C
O
O
N
a
are mixed with 2 moles of HCl in an aqueous solution. The pH of the resulting solution will be [Given
p
K
a
(
C
H
3
C
O
O
H
) = 4.74]
(1) 5.12
(2) 4.10
(3) 4.9
(4) 4.45
Answer
2
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
Explain qno.86. Ans(2)
Q.86.
M
g
O
H
2
is dissolved in water to make its saturated solution. If its
K
s
p
= 3.2
×
10
-
5
what will be its pH?
(1) 1.4
(2) 12.6
(3) 10.4
(4) 5.2
Answer
0
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
For a chemical reaction at equilibrium
A
+
B
⇌
k
2
k
1
D
. The value of k
1
= 5.1 × 10
–3
sec
–1
, k
2
= 15.3 × 10
–2
sec
–1
are given. The value of equilibrium constant will be
(1) 30 (2)
1
30
(3) 3 (4)
1
3
Answer
0
Jeneeta Eliza John
Subject: Chemistry
, asked on 2/5/18
Explain qno.46. Ans(4)
46. According to Ostwald dilution law, which of the following is true :
Explain qno.46. Ans(4)
Answer
0
Haripriya
Subject: Chemistry
, asked on 22/4/18
Please answer this question...:
Q. A buffer solution can be prepared from a mixture of.
a) NH
4
Cl and NaOH in 2:1 mole ratio
b) CH
3
COONa and HCl in 1:1 mole ratio.
c) CH
3
COONa & HCl in 2:1 mole ratio
d) CH
3
COONa and HCl in 1:2 mole ratio.
Answer
1
Royel Ghost
Subject: Chemistry
, asked on 14/4/18
Solve this:
Q. What is the value of Ksp for bismuth sulphate(Bi2S3) which has a solubility of 1.0? 10^-15 mol/litre at 25 C
Answer
2
Hermoine
Subject: Chemistry
, asked on 13/4/18
Please help
When can we neglect the dissociation constant alpha
Do we have to check Ka/c
And for what range it would be
Answer
1
Hermoine
Subject: Chemistry
, asked on 11/4/18
W
h
a
t
i
s
t
h
e
d
i
f
f
e
r
e
n
c
e
b
e
t
w
e
e
n
t
h
e
s
e
t
w
o
f
o
r
m
u
l
a
s
:
(
1
)
H
A
⇌
H
+
+
A
-
C
-
-
C
-
x
x
x
k
A
=
x
2
c
-
x
(
2
)
H
A
⇌
H
+
+
A
-
C
-
-
C
(
1
-
α
)
C
α
C
α
k
A
=
C
α
2
(
1
-
α
)
H
o
w
d
o
w
e
u
n
d
e
r
s
tan
d
w
h
i
c
h
f
o
r
m
u
l
a
t
o
u
s
e
sin
c
e
t
h
e
y
b
o
t
h
g
i
v
e
u
s
d
i
f
f
e
r
e
n
t
a
n
s
w
e
r
s
.
Answer
1
Aishwarya Trivedi
Subject: Chemistry
, asked on 5/4/18
please answer this in detail
Q. A sample of mixture of A(g) , B(g) and C(g) under equilibrium has mean molecular mass equal to 80. The equilibrium is :
A(g)
⇌
B(g) + C(g)
If initially 4 mole of 'A' gas is present then total number of mole at equilibrium is:
[M
A
100, M
B
= 60 M
C
40]
(1) 5 (2) 2 (3) 6 (4) 4
Answer
1
Aaradhya Kondawar
Subject: Chemistry
, asked on 1/4/18
Q.A buffer solution is prepared by mixing 'a' moles of CH3COONa and 'b' moles of CH3COOH such that (a + b) = 1, into water to make 1L buffer solution. If the buffer capacity Of this buffer solution is plotted against moles of salt CH3COONa (with a) then the plot obtained will be (to the scale) approximately.
Answer
1
Geetanjali Bhattacharjee
Subject: Chemistry
, asked on 23/3/18
What is the answer ??
Answer
1
1
2
3
4
5
Next
What are you looking for?
QUESTION number 9..
64. The acid dissociation constant of H2S and HS- are 10-7 and 10-13 respectively. The pH of 0.1 M aqeous solution of H2S will be
(1) 2 (2) 3
(3) 4 (4) 5
60. 'a' moles of PCl5 are heated in a closed container till equilibrium is established
PCl5(g) PCl3(g) +Cl2 (g)
at a pressure of P atm. If 'b' moles of PCl5 dissociate at equilibrium, then
Q.88. 5 moles of are mixed with 2 moles of HCl in an aqueous solution. The pH of the resulting solution will be [Given () = 4.74]
(1) 5.12
(2) 4.10
(3) 4.9
(4) 4.45
Q.86. is dissolved in water to make its saturated solution. If its = 3.2 what will be its pH?
(1) 1.4
(2) 12.6
(3) 10.4
(4) 5.2
(1) 30 (2) (3) 3 (4)
Explain qno.46. Ans(4)
46. According to Ostwald dilution law, which of the following is true :
Explain qno.46. Ans(4)
Q. A buffer solution can be prepared from a mixture of.
a) NH4Cl and NaOH in 2:1 mole ratio
b) CH3COONa and HCl in 1:1 mole ratio.
c) CH3COONa & HCl in 2:1 mole ratio
d) CH3COONa and HCl in 1:2 mole ratio.
Q. What is the value of Ksp for bismuth sulphate(Bi2S3) which has a solubility of 1.0? 10^-15 mol/litre at 25 C
When can we neglect the dissociation constant alpha
Do we have to check Ka/c
And for what range it would be
Q. A sample of mixture of A(g) , B(g) and C(g) under equilibrium has mean molecular mass equal to 80. The equilibrium is :
A(g) B(g) + C(g)
If initially 4 mole of 'A' gas is present then total number of mole at equilibrium is:
[MA 100, MB = 60 MC 40]
(1) 5 (2) 2 (3) 6 (4) 4