Question : Which of the following statements is correct?
I. On combustion over the air, lithium forms mainly the oxide.
II. The alkali metal halides are all high-melting, colourless crystalline liquids.
Option 1: Neither I nor II
Option 2: Only II
Option 3: Only I
Option 4: Both I and II
Correct Answer: Only I
Solution : The correct answer is Only I.
When lithium reacts with excess air, it often generates lithium oxide, but it can also form lithium peroxide. When lithium reacts with extra air, it often creates lithium oxide, but it can also form lithium peroxide. Hydrolyzing peroxides yields metal hydroxide and hydrogen peroxide. Alkali metal halides, like lithium fluoride (LiF), sodium chloride (NaCl), and so on, are typically high-melting, colourless crystalline solids, not liquids. They have high melting points due to the strong ionic bonds holding them together.
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