s-Block ElementsHard
Question
Which of the following statements is/are true ?
Options
A.All alkali metals are soft and can be cut with knife.
B.Alkali metals do not occur in free state in nature.
C.Alkali metals are highly electropositive elements.
D.Alkali metal hydrides are covalent and low melting solids.
Solution
(A) In alkali metals, the metallic bonds are weaker on account of large size and one valence electron per atom. So they are soft and can be cut with knife.
(B) The alkali metals are highly reactive due to their large size and low ionisation enthalpy. So alkali metals do not occur in free state in nature.
(C) The alkali metals are highly electropositive due to their large size and low ionisation enthalpy.
(D) All alkali metal hydrides are ionic solids with high melting points.
(B) The alkali metals are highly reactive due to their large size and low ionisation enthalpy. So alkali metals do not occur in free state in nature.
(C) The alkali metals are highly electropositive due to their large size and low ionisation enthalpy.
(D) All alkali metal hydrides are ionic solids with high melting points.
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