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Home Objective Questions Question Answer
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Objective Question & Answer

QUESTION

Objective Question

Q.1

While testing for COD of sewage, organic matter is oxidised by K2Cr2O7 in the presence of

A
HCI
B

HNO3
C

H2SO4
D

None of these
Answer ( Option C)

H2SO4

Solution

Mechanism: In a Chemical Oxygen Demand (COD) test, organic matter is chemically oxidized using a strong oxidizing

agent, Potassium Dichromate K2Cr2O7

Role of acid: This oxidation reaction must take place under a highlyacidic environment to proceed efficiently.

Concentrated Sulfuric Acid 2SO4 is added to provide these strong acidic conditions.

Catalyst usage: Additionally, Silver Sulfate Ag2SO4 is dissolved in the H2SO4 to act as a catalyst to help oxidize straight-chain organic compounds
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