Q.2 Give reasons for the following:
1. Metals form cations while non-metals form anions.
2. Potassium reacts vigorously with cold water while copper does not react with water or steam.
3. Rusting reduces the structural strength of iron.
4. A suspension of rust is basic in nature.
5. Galvanized steel is not used for articles used for edible applications.
Answers
Answer:
1) Metals lose or donate their valence electrons and form cations while non-metals gain or accept valence electrons to form anions.
2). Because pottasium is a highly reactive metal So it reacts vigorously with even cold water . And copper is less reactive metal so it doesn't react with even steam .
3). because iron loses its structural due to the formation of fe2O3 and it's structural is also low so the strength of iron also decreases.
4) Rust is chemically Fe2O3. ... Hence a suspension of rust in water will be basic. Therefore it will turn red litmus blue.In general metal oxides are basic in nature where as oxides of non-metals are acidic in nature. Metals react with acids to produce hydrogen gas that burns with a popsound.
5) so food items (specially citric like pickles etc) should not be saved in galvanized steel because the salts formed may be toxic in nature and the H2 gas liberated could spoil the taste of the food. ...
Explanation:
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