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Standard X
Chemistry
Relationship between Vapor Density & Relative Molecular Mass
The equivalen...
Question
The equivalent weight of a divalent metal whose chloride has vapour density equal to
60
, is:
A
30
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B
49
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C
24.5
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D
16.5
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Solution
The correct option is
B
49
Vapour density
=
M
o
l
e
c
u
l
a
r
w
t
.
o
f
c
o
m
p
o
u
n
d
2
Molecular wt. of chloride
(
M
C
l
2
)
=
2
×
60
=
120
[Metal is divalent, so two atoms of chlorine]
Molecular wt. of
M
C
l
2
=
Atomic mass of
M
+
2
×
Atomic mass of chlorine
120
=
M
+
2
(
35.5
)
120
−
71
=
M
=
49
Equivalent wt
=
M
o
l
e
c
u
l
a
r
w
t
V
a
l
e
n
c
y
⇒
49
2
⇒
24.5
Hence, option
C
is correct.
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