1(xi)
Assertion (A): Alkali metals do not form dipositive ions.
Reason (R): After loss of one electron alkali metals achieve stable electronic configuration of noble gases.
- (a)Both A and R are true and R is the correct explanation of A
- (b)Both A and are true but R is not the correct explanation of A
- (c)A is true but R is false
- (d)A is false but R is true
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Both A and R are true and R is the correct explanation of A
Reason — Alkali metals (such as lithium, sodium, and potassium) do not form dipositive ions. Instead, they form monovalent cations by losing one electron. This is because they have a single electron in their outermost shell, and losing this one electron achieves the stable noble gas configuration.