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Standard XII
Chemistry
Conductivity MP BP and Electronegativity (Group 2)
Potassium dic...
Question
Potassium dichromate in alkaline solution, with 30% H
2
O
2
produces :
A
K
3
C
r
O
8
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B
C
r
O
(
O
2
)
2
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C
C
r
O
3
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D
L
2
C
r
O
4
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Solution
The correct option is
C
K
3
C
r
O
8
In alkaline medium,
K
2
C
r
2
O
7
30
%
H
2
O
2
−
−−−−−
→
O
H
−
K
3
C
r
O
8
.
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0
Similar questions
Q.
Potassium dichromate in alkaline solution with
30
%
H
2
O
2
produces
K
3
C
r
O
8
.
How many peroxide linkages are found in the structure of
K
3
C
r
O
8
?
Q.
On shaking
H
2
O
2
with acidified potassium dichromate and ether, the ethereal layer becomes:
Q.
Potassium dichromate and concentrated
H
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l
are heated together.
K
2
C
r
2
O
7
+
H
C
l
⟶
K
C
l
+
.
.
.
.
+
.
.
.
.
.
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+
H
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Q.
Alkaline potassium permanganate and potassium dichromate convert alcohols into carboxylic acids on oxidation.
Q.
(a) What happens when ethanol is oxidised with alkaline potassium permanganate (or acidified potassium dichromate)? Write the equation of the reaction involved.
(b) Choose those compounds from the following which can turn blue litmus solution red:
HCHO, CH
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COOH, CH
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OH, C
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CHO
Give reasons for your choice.
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