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Question

Select the correct formula of Aluminium Sulphate.

This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is

Al2(SO4)3

Aluminium forms the Al3+ ion and the sulphate ion is SO42-.

To balance the charges, the positive charge from two aluminium ions (2 × 3 = 6) must equal the negative charge from three sulphate ions (3 × 2 = 6).

This gives two Al and three SO4 groups, so the formula is Al2(SO4)3.

Hence, the correct formula of Aluminium Sulphate is Al2(SO4)3.

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