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a
The electropositive character of alkali metals decreases with increase in atomic number
b
Lithium is a hard metal and cannot be cut with a knife
c
Alkali metals are strong reducing agents
d
Electronegativities of all alkali metals lie between 1.0 and 0.7
answer is A.
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Detailed Solution
Electronagativities ↓es and EN values lies between 0.7 [Cs] to 1.0[Li]Due to their large size, they have week interatomic attractions and hence they are soft in nature & they can easily cut with knife [Except Li]As the size ↑esinter atomic attraction ↓es Hardness character ↓esi.e., Li is hard metal [Due to high interatomic attractions] and can't cut with knife.