True-False

Question 11 Mark

Avogadro’s law determines the relation between molecular mass and absolute density.

Answer

False.
Correct statement: Avogadro’s law determines the relation between molecular mass and vapour density.

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Question 21 Mark

The volume occupied by 14 g of Nitrogen gas is 22.4 litres.

Answer

False.
Correct statement: The volume occupied by 14 g of Nitrogen gas is 11.2 litres.

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Question 31 Mark

The number of moles of a sample that contains 12.046 x 1023 atoms of iron is 2.

Answer

True.

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Question 41 Mark

The molecular formula of gases can be derived using Avogadro’s law.

Answer

True.

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Question 51 Mark

The mathematical representation of Avogadro’slawisV/n=Constant(or)Vccn(or) V = Constant × n.

Answer

True.

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Question 61 Mark

An equal volume of all gases under similar conditions of temperature and pressure contain a different number of molecules.

Answer

False.
Correct statement: Equal volume of all gases under similar conditions of temperature and pressure contain the same number of molecules.

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Question 71 Mark

One molecule of an element contains 6.023 × 1023 atoms and it is equal to its gram atomic mass.

Answer

True.

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Question 81 Mark

Water is an example of Hetero triatomic molecule.

Answer

True.

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Question 91 Mark

$O _2, N _2, H _2, Cl _2, Br _2, F _2, I _2$ are hetero diatomic molecules.

Answer

False.
Correct statement: $O _2, N _2, H _2, Cl _2, Br _2, F _2, I _2$ are homo diatomic molecules.

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Question 101 Mark

The number of atoms present in the molecule is called the Avogadro number.

Answer

False.
Correct statement: The number of atoms present in the molecule is called its Atomicity.

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Question 111 Mark

Except for noble gases, atoms of most of the elements are found in the combined form.

Answer

True.

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Question 121 Mark

Silicon is the most abundant element in the Earth’s crust.

Answer

False.
Correct statement: Oxygen is the most abundant element in the Earth’s crust.

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Question 131 Mark

The gram atomic mass of oxygen is 16 g.

Answer

True.

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Question 141 Mark

The stable isotope of carbon (C – 12) with atomic mass 12 is used as the standard for measuring the relative atomic mass of an element.

Answer

True.

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Question 151 Mark

The sum of the number of protons and neutrons of an atom is called Atomic number.

Answer

Correct statement: The sum of the number of protons and neutrons of an atom is called mass number.

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Question 161 Mark

The molecule is the smallest particle that takes part in a chemical reaction.

Answer

False.
Correct statement: The sum of the number of protons and neutrons of an atom is called mass number.

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Question 171 Mark

An atom of one element can be transmuted into an atom of other element is known as artificial transmutation.

Answer

True.

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Question 181 Mark

$H _2 O , NH _3, CH _4$ are examples of homoatomic molecules.

Answer

Correct statement: $H _2 O , NH _3, CH _4$ are examples of heteroatomic molecules.

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Question 191 Mark

Phosphorous and sulphur are monoatomic molecules.

Answer

False.
Correct statement: Phosphorous and sulphur are polyatomic molecules.

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Question 201 Mark

A molecule is the simplest structural unit of an element or compound which contains one or more atoms.

Answer

true

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Question 211 Mark

The atoms of certain elements such as hydrogen, oxygen and nitrogen have an independent existence.

Answer

False.
Correct statement: The atoms of certain elements such as hydrogen, oxygen and nitrogen do not have an independent existence

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Question 221 Mark

Atoms and molecules are the building blocks of matter.

Answer

True.

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Question 231 Mark

The atomicity of nitrogen, oxygen and hydrogen is two.

Answer

true

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Question 241 Mark

The value of Gram molar volume at STP is 11.2 litres.

Answer

Correct statement: The value of Gram molar volume at STP is 22.4 litres.

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Question 251 Mark

The volume of a gas at a given temperature and pressure is proportional to the number of particles.

Answer

True.

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Question 261 Mark

Avogadro’s hypothesis is used in the deduction of atomicity of elementary gases.

Answer

True.

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Question 271 Mark

The number of molecules present in one mole of an element is called atomicity of an element.

Answer

False.
Correct statement: The number of atoms present in one molecule of an element is called the atomicity of an element.

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Question 281 Mark

Isotones are the atoms of different elements with the same number of neutrons.

Answer

True.

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Question 291 Mark

Isobars are the atoms of the different elements with the same atomic number and different mass numbers.

Answer

False.
Correct statement: Isobars are the atoms of the different elements with the same mass number but a different atomic number.

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Question 301 Mark

Isotopes are the atoms of the same element may not be similar in all respects.

Answer

True.

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