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A piece of black electrode used in dry c...

A piece of black electrode used in dry cells on strong heating in air gave a colourless gas which turned lime water milky. What was the material of the electrode?

Text Solution

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Generally Graphite is used in making the electrodes. The piece of black electrode used in the dry cell is made of graphite. which is an allotrope of carbon. The black electrode, when on strong heating in air, gave a colourless gas carbon dioxide which turned lime waler milky. This prove that the material of the electrode is graphite
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Knowledge Check

  • The gas which turns lime water milky is :

    A
    `NO_2`
    B
    `CO_2`
    C
    `SO_2`
    D
    Both (B) and (C).

  • A white crystalline was heated with conc. H_2SO_4 and the colourless gaseous mixture was collected in a jar. The upper portion burned with a pale blue flame and the lower portion turned lime water milky. The crystalline solid is

    A
    `Na_2SO_3`
    B
    HCOONa
    C
    `H_2C_2O_4`
    D
    `C_12H_22O_11`