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Statement The atomic weight of an elemen...

Statement The atomic weight of an element is given by Dulong Petit's law: `at.wt.xxsp.` heat (cal`//`mole) cong6.4.
Explanation The formula is valid for metals only and not for all elements.

A

`S` is correct but `E` is wrong.

B

`S` is wrong but `E` is wrong.

C

Both `S` and `E` are correct and `E` is correct explanation of `S`.

D

Both `S` and `E` are correct but `E` is not correct explanation of `S.

Text Solution

Verified by Experts

The correct Answer is:
B
Dulong Petit's law is valid for metals only. Also it is `at.wt.xxsp`. Heat `(cal//g) cong 6.4`
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(a) Why does not the atomic mass of an element represent the actual mass of its atom? (b) The atomic mass of an element is in fraction. What does it mean? (c) Why is the value of Avogadros number 6.022 xx 10^(23) and not any other value? (d Does one gram mole of a gas occupy 24.4 L under all conditions of temperature and pressure?

1.020 g of metallic oxide contains 0.540g of the metal . Calculate the equivalent mass of the metal and hence its atomic mass with the help of Dulong and Petit's law. Taking the symbol for the metal s M. find the molecular formula of the oxide. The specific heat of the metal is 0.216 cal "deg"^(-1) g^(-1) .

Knowledge Check

  • (A) Atomic weight=Specific heat (cal/mol) xx64 . (R) The formula is valid for metals only.

    A
    If both (A) and (R) are correct and (R) is the correct explanation of (A).
    B
    If both (A) and (R) are correct but (R) is not the correct explanation of (A).
    C
    If (A) is correct but (R) is wrong.
    D
    If (A) is wrong but (R) is correct.

  • Empirical formula is the simplest formula of the compound which gives the atomic ratio of various elements present in one molecule of the compound. However, the molecular formula of the compound gives the number of atoms of various elements present in one molecule of the compound. Molecular formula=(Empirical formula) xxn n=("Molecular mass")/("Empirical formula mass") A compound may have same empirical and molecular formulae Both these formulae are calculated by using percentage composition of constituent elements. Two metallic oxides contain 27.6% and 30% oxygen respectively. if the formulae of first oxide is M_(3)O_(4) , that of second will be:

    A
    MO
    B
    `MO_(2)`
    C
    `M_(2)O_(5)`
    D
    `M_(2)O_(3)`

  • Amongst the following statements, select the set having statements which was porposed by Dalton. (1) All the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass. (2) When gases combine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same T & P (3) Chemical reaction involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction. (4) Matter consists of indivisible atoms

    A
    (1), (2), (3)
    B
    (1), (3), (4)
    C
    (1), (2), (4)
    D
    (1), (2), (3), (4)

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