A elements are named as alkali metals because_______________?
Correct answer: C. Both A & B
- A. Their oxides are basic
- B. Their oxide and hydroxides are water soluble
- C. Both A & B
- D. They are found in earth
Explanation
Group 1 metals are called alkali metals because their oxides and hydroxides produce soluble alkaline solutions in water. Their oxides react with water to form hydroxides, and the hydroxides are generally water-soluble strong bases. Students may choose only a by focusing on basic oxides, but the term alkali emphasizes the soluble alkaline products.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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