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Why is sodium kept immersed in kerosene ...

Why is sodium kept immersed in kerosene oil?

Text Solution

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Sodium is highly reactive metal and combines readily with `O_(2)` present in air to form oxide, which in turns reacts with mositure to form hydroxide which further reacts with `CO_(2)` to form carbonate. Therefore, to prevent the above reaction, sodium metal is kept under kerosene oil.
`Na+underset(("Air))(O_(2))rarrNa_(2)O`
`Na_(2)O+underset(("Moisture"))(H_(2)O)rarr 2NaOH`
`2NaOH+underset("Air")(CO_(2))rarr Na_(2)CO_(3)+H_(2)O`
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Why is sodium metal stored in kerosene ?

Give reason for the following: (a) Sodium is kept immersed in kerosene oil. (b) Iron, the most widely used metal, is never used in its pure state. (c) Hydrogen is not evolved when a metal reacts with nitric acid (except Mn and Mg).

Knowledge Check

  • Why is sodium metal stored in kerosene?

    A
    It catch fire in air.
    B
    It reacts with kerosene.
    C
    It dissolves in kerosene.
    D
    It maintains the lustre of sodium.

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    (a) Describe an activity to show that metals are good conductors of electricity. (b) Account for the following: (i) Hydrogen gas is not evolved when a metal reacts with nitric acid. (ii) For storing sodium metal, it is kept immersed in kerosene. (iii) The reaction of iron (III) oxide with aluminium is used to join cracked iron part machines.

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