Chemistry
Which one of the following is commonly used for pulp bleaching in the paper industry?

Glucose isomerase
Hydrogen peroxide
Mild sulphuric acid
Iodine and water

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Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

The low ionisation energy of sodium
sublimation of sodium to emit yellow colour
Its ability to absorb all other colours except yellow
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum

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