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Given below are few statements. Mark the statement which is not correct.
  • a)
    Gram atomic mass of an element may be defined as the mass of Avogadro's number of atoms
  • b)
    The molecular mass of a diatomic elementary gas is twice its atomic mass
  • c)
    Gay Lussac's law of chemical combination is valid for all substances
  • d)
    A pure compound has always a fixed proportion of masses of its constituents
Correct answer is option 'C'. Can you explain this answer?
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Given below are few statements. Mark the statement which is not correc...
Gay Lussac's law is true only for gaseous substances.
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Given below are few statements. Mark the statement which is not correc...
Explanation:
The correct answer is option 'C' - Gay Lussac's law of chemical combination is not valid for all substances.

Explanation of the other options:

a) Gram atomic mass of an element may be defined as the mass of Avogadro's number of atoms:
This statement is correct. The gram atomic mass of an element is defined as the mass of one mole of atoms of that element. One mole of any substance contains Avogadro's number of particles, which is approximately 6.022 × 10^23. Therefore, the gram atomic mass is the molar mass of the element expressed in grams.

b) The molecular mass of a diatomic elementary gas is twice its atomic mass:
This statement is also correct. Diatomic elementary gases exist as molecules with two atoms bonded together. Since each atom has the same atomic mass, the molecular mass of the diatomic gas is twice the atomic mass.

d) A pure compound always has a fixed proportion of masses of its constituents:
This statement is correct. A pure compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass. The ratio of the masses of the constituent elements in a pure compound is always constant.

Explanation of option 'C':

Gay Lussac's law of chemical combination states that when gases react, the volumes of the reacting gases and the volumes of the gaseous products, if they are also gases, are in a simple whole-number ratio, provided all gases are at the same temperature and pressure. However, this law is not valid for all substances.

The law is only applicable to gases because it is based on the assumption that gases behave ideally, meaning that their particles do not interact with each other and occupy negligible volumes. In reality, not all substances exist as gases, and even when they do, they may not behave ideally.

For example, solids and liquids do not follow Gay Lussac's law because their particles are closely packed and have strong intermolecular forces that prevent them from behaving like ideal gases. Additionally, some gases may deviate from ideal behavior under certain conditions, such as high pressures or low temperatures.

Therefore, Gay Lussac's law of chemical combination is only applicable to gases and cannot be generalized to all substances.
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Given below are few statements. Mark the statement which is not correct.a)Gram atomic mass of an element may be defined as the mass of Avogadros number of atomsb)The molecular mass of a diatomic elementary gas is twice its atomic massc)Gay Lussacs law of chemical combination is valid for all substancesd)A pure compound has always a fixed proportion of masses of its constituentsCorrect answer is option 'C'. Can you explain this answer?
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