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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?

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

Equals number of atoms are contained in one gram atomic weight of each element and the same number of molecules are found in one gram molecules weight of any compound . The terms gram atomic weight and gram molecular weight are used to refer to a fixed numer(Avogadro's number 6.022xx10^(23)) of particle. the term 'mole' stands for the amount of material which contains these number of particles. Compute gram molecular weight of H_(2) gas if 4 g of H_(2) gas contains 24.09 xx 10^(23) atoms.

Equals number of atoms are contained in one gram atomic weight of each element and the same number of molecules are found in one gram molecules weight of any compound . The terms gram atomic weight and gram molecular weight are used to refer to a fixed numer(Avogadro's number 6.022xx10^(23)) of particle. the term 'mole' stands for the amount of material which contains these number of particles. If 12 g C^(12) has equal number of atoms as Avogadro's number , what mass of ._(2)He^(4) will contain same number of atoms?

How many of the following statements are correct according to Mendeleef's period table ? (a) Mendeleef corrected the atomic weight of Be, In and Os b) Ar-k, Te-I and Co-Ni are anomalous pairs. c) Atomic weights of elements were corrected by using the relation Atomic Wt. (Eq.Wt) (valency) d) Eka baron is scandium e) Eka silicon is germanium f) Eka aluminium is galium g)This classification is based on valency h) Mendeleef's law is based on atomic weights

Three statements are given below (i) The enthyalpy of any element is zero in their stadard state (ii) The heat of neutralisation for any strong acid strong base at 25^(@)C is -13.7 kJ/mole (iii) Q=DeltaE+W is a mathematical form of first law of thermodynamics if work is done by the system according IUPAC

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)