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Why argon is not represented by Ar2?...

Why argon is not represented by `Ar_2`?

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Knowledge Check

  • In moon rock sample the ratio of the number of stable argon-40 atoms present to the number of radioactive potassium-40 atoms is 7:1. Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of 2.5 xx 10^(9_ yr. The age of the rock is

    A
    `2.5 xx10^(9)` yr
    B
    `5.0 xx10^(9)` yr
    C
    `7.5 xx10^(9) ` yr
    D
    `10^(10)` yr

  • A sample of argon of 1 atm pressure and 300K expands reversibly and adiabatically from 1.25 dm^(3) " to " 2.5 dm^(3) . Calculate the approximate enthalpy (in J) change (i) C_(V) for argon is 12.48 JK^(-1) (ii) Assume argon to be an ideal gas (iii) Delta T= 111.5K

    A
    20.9
    B
    117
    C
    234
    D
    58.5

  • In solid argon, the atoms are held together by

    A
    Ionic bonds
    B
    Hydrogen bodns
    C
    Vander Waal forces
    D
    Hydrophobic forces

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