Question

Caustic soda is the common name for -

• A. Mg(OH)₂
• B. KOH
• C. Ca(OH)₂
• D. NaOH

Answer 1

The correct option is D

NaOH

Explanation for the correct option

(D) NaOH:

1. Caustic soda is the common name for NaOH.
2. Caustic soda is perfect for cleaning drains and is often used in drain cleaners, both for domestic and industrial cleaning.
3. The sodium hydroxide will convert fats and grease that clog pipes into soap, which dissolves into the water.

Explanation for the incorrect options

Option A:

Mg(OH)₂:Milk of magnesia is creamy like colloid form of magnesium hydroxide, . It is used as an antacid to neutralize excess stomach acid.

Option B:

1. Potassium hydroxide solution (KOH aqueous) is a colourless inorganic liquid that acts as a strong base (alkali).
2. KOH solution is also known as caustic potash or potash lye and has many different applications.

Option C:

1. Calcium hydroxide, commonly referred to as slaked lime, is described by the chemical formula Ca(OH)₂.
2. It is an inorganic compound which has a white, powdery appearance in its solid-state.
3. However, Ca(OH)2 has a colourless appearance in its crystalline form.

Final Answer: Hence option (D) is correct, Caustic soda is the common name for NaOH