Valencies of aluminium and phosphate are
(a) +3 and -3 respectively.
Aluminium (Al) has a valency of +3 because it loses three electrons to achieve stability. Phosphate (PO₄³⁻) has a valency of -3 as it gains three electrons. They combine to form AlPO₄ in a neutral compound.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.
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(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively.
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