Mole Concept an...

Which of the following statements is not true according to Gay Lussac`s law of combining volumes?

Which of the following has the highest number of moles of oxygen atoms in its one mole?

Under the same conditions of temperature and pressure, 2 litres of SO₂, 3 litres of chlorine, 6 litres of hydrogen, 5 litres of nitrogen and 4 litres of CO₂ are collected.

Which of the following is the correct arrangement of these gases in increasing order of the number of molecules of the collected gases?

Which of the following is not true for gas equation?

How many calcium ions are present in 7.4 g of Ca(OH)₂?

How many molecules are present in 4 g of methane?

What should be the mass of Na, so that it contains the same number of atoms as present in 4 g of calcium?

Why are atomic mass of some elements not whole numbers?

4NH₃ + 5O₂  4NO + 6H₂O
What volume of nitrogen monoxide will be produced in the above reaction at the same temperature and pressure if 36 litres of reactants are consumed?

How many electrons are present in 1.7g of methane?

How many molecules are present in 7 g of nitrogen gas?

Which of the following is not an application of Avogadro's law?

Which of the following has the highest number of hydrogen atoms in one mole of its molecule?

What volume of methane gas is required to produce 80 ml of HCl gas in the following reaction at STP?
CH₄ + 2Cl₂  CH₂Cl₂ + 2HCl

An element has isotopes X and Y. Atomic mass of Y is 37 and 75% of the element exists in the form of X isotope. What is the atomic mass of X if the atomic mass of the element is 35.5?

Which of the following is the correct arrangement of molecules in increasing order of mass of 0.1 mole of each of these molecules?
CaCO₃, CaCl₂, Na₂SO₄, 10H₂O, Mg
[Ca  40, Na  23, Mg  24, S = 32, C  12, Cl  35.5, O  16, H  1]

Which of the following is the correct molecular mass of CuSO₄.5H₂O?
(Cu  63.5, S  32, O  16, H  1)