Some Basic Concepts of Chemistry Test - 2

The volume of oxygen necessary for complete combustion of 20 litres of propane is _________ litres.

The approximate number of molecules in one litre of water is

Consider the following skeleton equation:

__As₂O₃ + __SnCl₂ + __HCl → __SnCl₄ + __As + __H₂O

What are the stoichiometric coefficients of As2O3, SnCl2, HCl, SnCl4, As and H2O, when the above equation is balanced?

The ratio between the volumes of the gaseous reactant and the gaseous products can be expressed in simple whole numbers. This law is known as

How many significant figures are present in 0.324?

If 500 cc of water gas (CO + H₂) is exploded with 500 cc of oxygen, then what will be the volume ratio of CO₂ : Steam : O₂?

(Assume that the volumes are measured under the same temperature and pressure.)

If in a reaction, HNO₃ is reduced to NO, the mass of HNO₃ absorbing one mole of electrons would be

The following question has four choices, out of which ONLY ONE is correct.

A certain non-metal X forms two oxides A and B. The mass percentage of oxygen in oxide A (X₄O₆) is 43.7%, which is the same as that of X in the oxide B. The formula of the oxide B is

Which of the following correctly represents a balanced chemical equation?

The molarity of concentrated sulphuric acid (ρ = 1.834 g cm^–3) containing 95% of H₂SO₄ by mass is