Question

State the reason for the following:
)
1)
1)
Aluminium oxide is called an amphotene oxide
An iron strip dipped in a blue copper suphate solution turns the blue solution pa
Hydrogen gas is not evolved when most metals react with nitne acid
Calcium does not occur in Free State in nature.
Sodium or potassium metals are kept immersed under kerosene
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Answer 1

1. Aluminium oxide is called an amphoteric oxide as it shows acidic as well as Basic nature.
2. When we dip Iron Strip in Blue copper sulphate solution the colour gets changed as Iron is more reactiove than copper so iron displaces copper from its solution and forms ferrous sulphate.
3. Sorry but i didn't understood the third one.
4. Calcium does not occur in Free state in nature as calcium is a highely reactive element so it readily gets reacted with the surrounding element
5. Sodium and Potassium metals are kept immersed underr kerosene as these metals are highely reactive and if gets in contact in air they catches fire.

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