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- #s- Block Elements ( Alkali and Alkaline earth metals )
Identify the incorrect statement.
Sodium react vigorously with water than Lithium
Sodium peroxide dissolves in cold water giving and
Both and
on heating separately decompose and each liberates two gases
and
Alkali metals are prepared only by the electrolysis of their fused chlorides.
Answers (1)
Although Lithium has more negative than sodium but it reacts less vigorously with water than sodium because sodium has lower melting point than lithium. Sodium melts on the surface of water and expose larger surface area and reacts vigorously and even it catches fire.
Sodium peroxide is a powerful oxidant. When, it reacts with water, it gives sodium hydroxide and hydrogen peroxide.
Sodium nitrate decompose to sodium nitrite and oxygen.
while lithium nitrate decompose into the oxide due to the relative small size of lithium which makes it more polarising and favours the formation of oxide.
Aqueous salt solution are not used for the electrolysis of alkali metals because they are more electropositive than hydrogen ion due to which hydrogen ions will get discharge preferentially to form hydrogen gas. So only fused salts are used in electrolysis for the preparation of alkali metals.
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