Baking soda is also known as _____.

Solution:

Baking soda is known as sodium bicarbonate (NaHCO₃); it is also known as sodium hydrogen carbonate. 

Sodium hydroxide is 'Caustic Soda'.  

Sodium chloride is 'Table Salt'. 

Sodium diuranate is known as the 'Yellow oxide of Uranium'.

So, the correct answer is - sodium bicarbonate.