[PLEASE ANSWER FAST] : When Sodium reacts with oxygen, it gives Sodium oxide. It is a redox reaction. What is the substance reduced here?

The substance reduced is oxygen.

Hope this helps.

Oxygen is reduced

Explanation:

This is because when oxygen is changing to Sodium oxide , metal is added . The addition of the metal there is reduction in this sense oxygen is reduced but with the sodium , oxygen is being added to the sodium hence sodium is oxidized

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.