NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Divyansh Saxena
Subject: Chemistry
, asked on 2/2/18
A 0.46g sample of As2O3 required 25 ml of kmno4 solution for titration the molarity of kmno4 is
Answer
1
Divyansh Saxena
Subject: Chemistry
, asked on 1/2/18
a 0.46g sample as AS203 required 25 ml of KMnO4 solution for its titration the molarity of KMNO4
Answer
1
Divyansh Saxena
Subject: Chemistry
, asked on 1/2/18
how many millilitres of 0.1 N H2SO4 solution will be required for complete reaction with a solution containing 0.125 g of pure na2so4
Answer
2
Divyansh Saxena
Subject: Chemistry
, asked on 1/2/18
Solve this:
An organic compound contains oxygen, carbon, hydrogen and sulphur.
A sample Of it with a mass Of 1.045 g Was burned in oxygen to give gaseous CO
2
, H
2
O, SO
2
These gases passed through 500.0 mL of an acidified 0.0200M KMnO
4
Solution, which caused the SO
2
, to be oxidized to SO
4
2
-
. Only part of the available KMnO
4
was reduced to Mn
2
+
. Next. 50.00 mL of 0.0300 M SnCl
2
was added to a 50.00 mL portion of this solution. which still contained unreduced KMnO
4
There was more than enough added SnCl
2
to cause all of the remaining MnO
4
-
in the 50 mL portion to be reduced to Mn
2
+
. The excess Sn
2
+
that remained after the reaction was then titrated with 0.0100M KMnO
4
, requiring 27.28 mL Of the KMnO
4
, solution to reach the end point. What was the percentage of sulfur in the original sample of the organic compound that had been burned?
Answer
1
Divyansh Saxena
Subject: Chemistry
, asked on 1/2/18
4 question
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 24/1/18
Solve this:
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 24/1/18
Plz elaborate the step where charges are balanced
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 24/1/18
In step 4 why to.multiply 4 with 2 and 2 with 4?
Cant i simply multiply 2 with 2 to get 4 ?
Answer
1
Tulsi Mehta
Subject: Chemistry
, asked on 23/1/18
Calculate oxidation number of each element in KClO3 and CaCO3
Answer
1
Naga Nandhini
Subject: Chemistry
, asked on 19/1/18
Q. Identify the substance oxidised, reduced, oxidising agent and reducing agent for the following
reaction:
P
b
(
s
)
+
P
b
O
2
(
s
)
+
2
H
2
S
O
4
(
a
q
)
→
2
P
b
S
O
4
(
s
)
+
2
H
2
O
(
I
)
Answer
2
Devansh Mehta
Subject: Chemistry
, asked on 19/1/18
Q 5.
(a) What are different methods of preparation of Hydrogen Peroxide.
(b) Describe the Structure of
H
2
O
2
Answer
2
Devansh Mehta
Subject: Chemistry
, asked on 19/1/18
Q 4. (a) Balance the following redox equation by oxidation number method. The reaction occur in acidic medium
H
2
O
2
a
q
+
C
r
2
O
7
a
q
2
-
→
O
2
a
q
+
C
r
3
+
a
q
b
G
i
v
e
u
s
e
s
o
f
H
e
a
v
y
w
a
t
e
r
D
2
O
Answer
1
Devansh Mehta
Subject: Chemistry
, asked on 19/1/18
Q. (a) Explain the mechanism of oxidizing and reducing agent with suitable example ?
(b) What is an oxidation number or oxidation state? Explain with example?
Answer
1
Devansh Mehta
Subject: Chemistry
, asked on 19/1/18
Q 3.
Assign the oxidation number of the underline species in the following compounds or ions.
v
B
i
O
3
-
Answer
1
Devansh Mehta
Subject: Chemistry
, asked on 19/1/18
Q
4
.
a
B
a
l
a
n
c
e
t
h
e
f
o
l
l
o
w
i
n
g
r
e
d
o
x
e
q
u
a
t
i
o
n
b
y
o
x
i
d
a
t
i
o
n
n
u
m
b
e
r
m
e
t
h
o
d
.
T
h
e
r
e
a
c
t
i
o
n
o
c
c
u
r
i
n
a
c
i
d
i
c
m
e
d
i
u
m
H
2
O
2
a
q
+
C
r
2
7
a
q
2
-
→
O
2
a
q
+
C
r
3
+
a
q
b
g
i
v
e
u
s
e
s
o
f
H
e
a
v
y
w
a
t
e
r
D
2
O
Answer
1
Prev
1
2
3
4
5
Next
What are you looking for?
An organic compound contains oxygen, carbon, hydrogen and sulphur.
A sample Of it with a mass Of 1.045 g Was burned in oxygen to give gaseous CO2, H2O, SO2
These gases passed through 500.0 mL of an acidified 0.0200M KMnO4 Solution, which caused the SO2, to be oxidized to SO42-. Only part of the available KMnO4 was reduced to Mn2+. Next. 50.00 mL of 0.0300 M SnCl2 was added to a 50.00 mL portion of this solution. which still contained unreduced KMnO4
There was more than enough added SnCl2 to cause all of the remaining MnO4- in the 50 mL portion to be reduced to Mn2+. The excess Sn2+ that remained after the reaction was then titrated with 0.0100M KMnO4, requiring 27.28 mL Of the KMnO4, solution to reach the end point. What was the percentage of sulfur in the original sample of the organic compound that had been burned?
Cant i simply multiply 2 with 2 to get 4 ?
reaction:
(b) Describe the Structure of
(b) What is an oxidation number or oxidation state? Explain with example?