Question

Arrange the following bases in increasing order of their basic strength:

Sodium hydroxide
Magnesium hydroxide
Aluminium hydroxide
Ammonium hydroxide
Select the correct answer using the code given below:

• A. 4 \; 2 \; 1 \; 3
• B. 4 \; 1 \; 2 \; 3
• C. 4 \; 3 \; 2 \; 1
• D. 1 \; 2 \; 3 \; 4

Hint:

Group-1 metal hydroxides are the strongest bases.
Amphoteric hydroxides like (textAl(OH)3) show very weak basic nature.

Answer 1

The Correct Option is C

Step 1: Recall the relative basic strength of hydroxides.

Aluminium hydroxide is amphoteric and hence the weakest base.
Ammonium hydroxide is a weak base.
Magnesium hydroxide is a weak base but stronger than ammonium hydroxide.
Sodium hydroxide is a strong base.
Step 2: Arrange from weakest to strongest base. \[ \text{Al(OH)}_3<\text{NH}_4\text{OH}<\text{Mg(OH)}_2<\text{NaOH} \] Step 3: Write the corresponding numbers. \[ 3 \; 4 \; 2 \; 1 \] Step 4: Match with the given options. The correct option is \(\boxed{\text{(C)}}\).