
One mole of a mixture of and requires exactly of in solution for the complete conversion of all the into . How much would it require for conversion into , if the mixture (one mole) is completely oxidised to ?

Important Questions on Some Basic Concepts of Chemistry

In the following reaction:
of , atoms of and of reacted and formed of compound . If the atomic mass of and are and , respectively. What is the atomic mass of in ? (Avogadro number)



Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in ) of produced per of consumed is ____. (Atomic weights in )
Give the answer to the nearest integer value.




The ammonia is prepared by treating ammonium sulphate with calcium hydroxide is completely used by to form a stable coordination compound. Assume that, both the reactions are completed. If of ammonium sulphate and of are used in the preparation, the combined weight (in grams) of gypsum and the nickel ammonia coordination compound produced is ____.
Atomic weights in :

(Atomic weight: Mg = 24)

(Given the molar mass of and molar mass of )


(Assume complete combustion of reactant)

The volume of the oxygen gas at STP consumed in the reaction is closest to


is used, even in spacecrafts, to produce The daily consumption of pure by a person in at atm, How much amount of in grams, is required to produce for the daily consumption of a person at atm, ?
Give answer to the nearest integer value.

If of oxygen is burnt with of ethane. Calculate the volume of formed.

(Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)



