
On subjecting mixture of and to repeated electric spark, of was required for combustion. What was the mole percentage of in the mixture under identical conditions?

Important Questions on Some Basic Concepts of Chemistry

The temperature of an object is Its value in Fahrenheit scale is


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.



Convert into Celsius.

A gaseous hydrocarbon on combustion gives of water and . What is the empirical formula of the hydrocarbon?



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)


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


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)



[Density of fatty acid

