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IMPORTANT
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On addition of ferrous sulphate crystals to an acidic solution of potassium dichromate, chromium sulphate is formed. The change in the oxidation state of chromium is

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Important Questions on The d- and f-Block Elements

MEDIUM
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 90
In the reaction between KI and acidified potassium dichromate solution, the elements showing a change in oxidation state are
EASY
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 91
Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium
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Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 92

MnO2 when fused with KOH and oxidised in air gives a dark green compound X. In acidic solution, X undergoes disproportion to give an intense purple compound Y and MnO2. The compounds X and Y, respectively, are:

MEDIUM
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 93
The yellow colour of chromate changes to orange on acidification due to formation of:
MEDIUM
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 94
FeCl3.6H2O is actually
MEDIUM
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 95
A compound is yellow when hot and white when cold. The compound is:
EASY
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 96
The solubility of silver bromide in hypo solution (excess) is due to the formation of:
EASY
Chemistry
IMPORTANT
Chemistry Crash Course BITSAT>Chapter 22 - The d- and f-Block Elements>Exercise 1>Q 97
In a dilute alkaline solution, MnO4-  changes to: