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At normal temperature IA group metals adopt a body centred cubic type of lattice with a cooridnation
number of eight

LiO₂ and NaO₂ are yellow but KO₂, is colourless

Lithium is softer than the other metal but is harder than lead

At very low temperature lithium forms a hexagonal close packed structure with a coordination number of 12

answer is A, B.

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Detailed Solution

At normal temperature IA group metals adopt a body centred cubic type of lattice with a cooridnation
number of eight

At very low temperature lithium forms a hexagonal close packed structure with a coordination number of 12

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