Lakhmir Singh solutions for केमिस्ट्री [इंग्रजी] इयत्ता १० आईसीएसई chapter 5 - Mole Concept and Stoichiometry [Latest edition]

State whether the following statement is True or False.

A mole is a collection of elementary particles.

State whether the following statement is True or False.

The simplest ratio of volumes of nitrogen, hydrogen and ammonia in the formation of ammonia is 1 : 3 : 1.

State whether the following statement is True or False.

Avogadro's number is denoted by N_A.

According to ______ law, equal volumes of all gases under the same conditions of temperature and pressure contain the same number of molecules.

______ is the smallest particle of an element that can take part in a chemical reaction.

Atomicity of sulphur is ______.

Which of the following is a tetratomic molecule?

The simple ratio of volumes in which hydrogen and chlorine molecules combine to give HCl is ______.

State Gay-Lussac’s law of combining volumes.

State the distinction made by Avogadro between atoms and molecules.

Define limiting reagent. Give a suitable example.

What volume of ammonia is required to produce 130 cm³ of steam?

\[\ce{4NH3 + 5O2 -> 4NO + 6H2O}\]

A sample of ammonium nitrate upon heating yields 7.58 dm³ of steam.

\[\ce{NH4NO3 -> N2O + 2H2O}\]

What volume of N₂O is released?

State whether the following statement is True or False.

Atomic mass unit, 1 u equals to one-twelfth the mass of a carbon-12 atom.

State whether the following statement is True or False.

1 mole of sulphur (S₈) contains 8 × 6.022 × 10²³ atoms.

State whether the following statement is True or False.

The vapour density of a gas or vapour is twice its relative molecular mass.

Gram molecular mass of any gas occupies ______ dm³ of volume at S.T.Р.

Weight of 6.022 × 10²³ molecules of a gas is equal to its gram ______ mass.

Gram molecular mass of water is ______ g.

1 L of any gas would weigh how many times its vapour density.

How many grams of ammonia is present in its 0.2 mole?

Number of molecules in 0.49 g of H₂SO₄ is ______ × 10²¹.

What do you mean by Atomic mass?

What do you understand by the term mole.

Define the term:

Vapour density

Calculate the mass of one atom of nitrogen and one molecule of nitrogen (atomic mass of nitrogen = 14 u).

Calculate the mass of 15.055 × 10²² molecules of carbon dioxide.

What will be the atomicity of nitrogen if 14 g of nitrogen occupies 11.2 L at S.T.P.?

What will be the volume (in cm³) occupied by 0.8 g of Cl₂ at S.T.P.?

What volume will 26.4 g of a gas will occupy at S.T.P. if its vapour density is 22?

State whether the following statement is True or False.

The empirical formula of hydrogen peroxide is OН.

State whether the following statement is True or False.

The empirical formula and molecular formula of a compound may be the same.

State whether the following statement is True or False.

Benzene has the same empirical and molecular formula.

The percentage composition of an element in a compound is its mass in ______ g of the compound.

The percentage of water of crystallisation in hydrous copper sulphate is ______.

The empirical formula of acetic acid is ______.