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Byju's Answer
Standard XII
Chemistry
Oxyacids of Phosphorus
For the react...
Question
For the reaction,
H
3
P
O
2
+
N
a
O
H
→
N
a
H
2
P
O
2
+
H
2
O
What is the equivalent weight of
H
3
P
O
2
? (mol. wt. is M)
A
M
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B
M
2
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C
M
3
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D
None of these
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Solution
The correct option is
A
M
As
H
3
P
O
2
is a monobasic acid.
∴
n
−
f
a
c
t
o
r
=
1
.
Equivalent weight
=
M
o
l
e
c
u
l
a
r
w
e
i
g
h
t
/
A
t
o
m
i
c
w
e
i
g
h
t
n
−
f
a
c
t
o
r
=
M
/
1
=
M
.
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1
Similar questions
Q.
Equivalent weight of
H
3
P
O
2
when it disproportionates into
P
H
3
and
H
3
P
O
3
(mol. wt. =
M
) is :
Q.
How many substances underlined have equivalent weight equal to molecular weight based on the reactions?
H
3
P
O
4
–
––––––
–
+
C
a
(
O
H
)
2
⟶
C
a
H
P
O
4
+
2
H
2
O
H
3
P
O
2
–
––––––
–
+
N
a
O
H
⟶
N
a
H
2
P
O
2
+
H
2
O
N
a
H
C
2
O
4
–
––––––––––
–
+
N
a
O
H
⟶
N
a
2
C
2
O
4
+
H
2
O
Q.
H
3
P
O
2
+
N
a
O
H
⟶
N
a
H
2
P
O
2
+
H
2
O
What is the equivalent weight of
H
3
P
O
2
? (Mol. wt. is M)
Q.
The equivalent weight of
N
a
2
S
2
O
3
(Mol. wt . = M ) in the reaction,
2
N
a
2
S
2
O
3
+
I
2
→
N
a
2
S
4
O
6
+
2
N
a
I
is :
Q.
In the disproportion reaction:
H
3
P
O
2
→
P
H
3
+
H
3
P
O
3
The equivalent mass of
H
3
P
O
2
is (M = molar mass of
H
3
P
O
2
)
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