Question

Amongst baking soda, caustic soda and washing soda, carbonate anion is present in ______.

Options

• Washing soda only

• Washing soda and caustic soda only 

• Washing soda and baking soda only 

• Baking soda, caustic soda and washing soda

Answer 1

Amongst baking soda, caustic soda and washing soda, carbonate anion is present in washing soda only.

Explanation:

• Baking soda: NaHCO₃
• Washing soda: Na₂CO₃.10H₂O
• Caustic soda: NaOH

Bicarbonate anion `("HCO"_3^-)` is present in baking soda, OH⁻ is present in caustic soda, and `"CO"_3^(2-)` anion is present in washing soda.

So, only washing soda contains carbonate anion.