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a
It reacts with both acids and bases
b
Its maximum covalency is ‘6’
c
It is a strong reducing agent
d
It becomes passive with con HCl
answer is D.
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Detailed Solution
→ Al reacts with both acids as well as bases,ie.,Al shows amphoteric nature. Sodium meta aluminate→ Al maximum covalency is 6,due to presence of valency empty 3d-orbitals. eg.,→ " Al "acts as strong reducing agent.eg.,Al do not passive with conc.HCl