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What are the products when sodium reacts with cold water?

Correct answer D. Sodium hydroxide and hydrogen

Explanation

Sodium reacts vigorously with cold water: 2Na + 2H₂O → 2NaOH + H₂. The solution formed is strongly alkaline and hydrogen gas is released.

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Question 04 s- and p-Block Elements

Why is the first ionisation energy of aluminium lower than that of magnesium?

Correct answer A. The electron removed from Al is in a 3p orbital, which is higher in energy and partly shielded by 3s electrons

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