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Write equations for the reactions of C...

Write equations for the reactions of
Calcium and potassium with water

Text Solution

Verified by Experts

The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire.
`Ca(s) + 2H_(2)O(I) rarr Ca(OH)_(2)(aq) + H_(2)(g) + "Heat"`
Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.
Potassium react violently with cold water and its reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.
`2K(s) + 2H_(2)O(I) rarr 2KOH(aq) + H_(2)(g) + "Heat"`
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Knowledge Check

  • The reaction of water sodium and potassium is

    A
    Reversible
    B
    Irreversible and endothermic
    C
    Exothermic
    D
    Endothermic

  • The reaction of calcium cyanamide with water yields

    A
    `Ca(OH)_(2) and N_(2)`
    B
    `CaC_(2) and N_(2)H_(4)`
    C
    `Ca(HCO_(3))_(2) and NH_(3)`
    D
    `CaCO_(3) and NH_(4)OH`

  • The reaction of calcium cyanamide with water yields

    A
    `Ca(OH)_(2) and N_(2)`
    B
    `CaC_(2) and N_(2)H_(4)`
    C
    `Ca(HCO_(3))_(2) and NH_(3)`
    D
    `CaCO_(3) and NH_(4)OH`

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