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When hydrogen burns is oxygen, water is ...

When hydrogen burns is oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place :
(a) in the first case.
(b) in the second case ?

Text Solution

Verified by Experts

The correct Answer is:
(a) Combination reaction (b) Decomposition reaction
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(a) When sodium is brunt in chlorine, sodium chloride is formed, and when molten sodium chloride is electrolysed, then sodium and chorine are formed. What type of reaction takes place: (i) in the first case ? (ii) in the second case ? (b) When hydrogen is prossed over heated copper oxide, copper and stem are formed. write a balanced chemical equation for this reaction. state which of the chemicals is oxidised and which is reduced ? (c) what would you observe when zinc is added to a solution of iron sulphate ? write the chemical equation of the reaction which takes place. why does this reaction occur?

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Knowledge Check

  • When water is electrolysed , volume of hydrogen and oxygen are evolved in the ratio of

    A
    `1:1`
    B
    `1:8`
    C
    `1:18`
    D
    `2:1`

  • When water is electrolysed, then which of the following is formed

    A
    `D_(2)O`
    B
    `O_(2)`
    C
    `H_(2)`
    D
    Both (b) and (c)

  • When water is electrolysed, hydrogen and oxygen gas are produced. If 1.008 g of H_(2) is liberated at the cathode. What mass of O_(2) is formed at the anode?

    A
    32.0g
    B
    16.0g
    C
    8.00g
    D
    4.00g

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