Question

What are the causes of high and low quantum yields of photochemical reaction?

Answer 1

Answer:

The causes of high and low quantum yield is the no .of molecules which are decomposed per photon.

Explanation:

#When 2 or more molecules are decomposed per photon,the quantum yield is greater than 1.

#when the no.of molecules decomposed is less than 1 per photon,quantum yield is less than 1 and the reaction has a low quantum yield

Answer 2

Causes of high and low quantum yield:

Cause of low Quantum yield:

• Excited molecules may get deactivated before they form a product so the value is less than 1.

• Collision of excited molecule with non-excited molecule.

• Molecules may not receive adequate energy to enable them to react.

• The photo chemical reaction may be reversed.

• Recombination of scattered fragments will produce the low quantum yield.

Cause of High Quantum yield:

• The activated molecule reacts with another molecule.

• The radiation absorption includes the production of the atoms with initiate the chain reaction.

• The intermediate product is formed which acts as a catalyst.

• After the absorption of radiation, the activated molecule which is formed may collide with another active molecule.

Learn more about quantum yield

The quantum yield for the photochemical formation of HCl is high whereas HBr is very low, Why?

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