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Science · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 3 · Q27
(a) Sodium metal is stored under kerosene oil. Why? (b) Some metal oxides are soluble in water. What are the aqueous solutions of these oxides…
(a)
Sodium metal is stored under kerosene oil. Why ?
(b)
Some metal oxides are soluble in water. What are the aqueous solutions of these oxides called ? Write one example of such a solution.
(c)
At ordinary temperature the surface of metals such as magnesium, aluminium, zinc etc. is covered with a thin layer. What is the composition of this layer ? State its importance.
Marking-scheme solution
(a)
Sodium metal reacts vigorously and catches fires if kept in open.
(b)
Alkalis. e.g. NaOH/KOH
(c)
Composition of this layer is the respective metal oxide. It prevents the metal from further oxidation/ protects the metal.
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