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JEE Mains Questions
Hydrogen
Chemistry
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Very pure hydrogen
(
9
9
.
9
%
)
can be made by which of the following processes?
A
Reaction of methane with steam
B
Mixing natural hydrocarbons of high molecular weight
C
Electrolysis of water
D
Reaction of salt like hydrides with water
Hard
JEE Mains
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The correct statements among (a) to (d) are:
(a) saline hydrides produce
H
2
gas when reacted with
H
2
O
.
(b) Reaction of
L
i
A
l
H
4
with
B
F
3
leads to
B
2
H
6
.
(c)
P
H
3
and
C
H
4
are electron - rich and electron - precise hydrides, respectively.
(d)
H
F
and
C
H
4
are called as molecular hydrides.
A
(c) and (d) only
B
(a), (b) and (c) only
C
(a), (b), (c) and (d)
D
(a), (c) and (d) only
Hard
JEE Mains
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Hydrogen peroxide oxidises
[
F
e
(
C
N
)
6
]
4
−
to
[
F
e
(
C
N
)
6
]
3
−
in acidic medium but reduce
[
F
e
(
C
N
)
6
]
3
−
to
[
F
e
(
C
N
)
6
]
4
−
in alkaline medium. The other products formed are, respectively:
A
H
2
O
and
(
H
2
O
+
O
2
)
B
H
2
O
and
(
H
2
O
+
O
H
−
)
C
(
H
2
O
+
O
2
)
and
H
2
O
D
(
H
2
O
+
O
2
)
and
(
H
2
O
+
O
H
−
)
Hard
JEE Mains
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In context with the industrial preparation of hydrogen from water gas
(
C
O
+
H
2
)
, which of the following is the correct statement?
A
H
2
is removed through occlusion with Pd
B
C
O
is oxidised to
C
O
2
with steam in the presence of a catalyst followed by absorption of
C
O
2
in alkali
C
C
O
and
H
2
are fractionally separated using differences in their densities
D
C
O
is removed by absorption in aqueous
C
u
2
C
l
2
solution
Medium
JEE Mains
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The hydride that is not electron deficent is:
A
B
2
H
6
B
A
l
H
3
C
S
i
H
4
D
G
a
H
3
Medium
JEE Mains
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