How many of the following are anomalous properties of lithium ?
(i) Hydrated lithium ion is the largest among alkali metals .
(ii) The melting and boiling points of lithium are comparatively high .
(iii) Lithium directly reacts with atmospheric nitrogen on heating .
(iv) Lithium chloride is the only hydrated salt , among all alkali chlorides .
(v) Lithium salts shows crimson red colour in flame test .
(vi) Lithium is softer than that of other alkali metals .
(vii) Lithium reacts directly with carbon to form an ionic carbide .

Answer

5