Which of the following statements is /are true? (a) All alkali metals are soft and can be cut wi...

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Which of the following statements is /are true?
(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 hyrides are covalent in character.
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