Which one of the following is not an element
Diamond
Graphite
Silica
Ozone
Distillation
Crystallization
Sublimation
Adding aceitic acid
A mixture of methyl alcohol and acetone can be separated by
Distillation
Fractional distillation
Steam distillation
Distillation under reduced pressure
Mixture of sand and sulphur may best be separated by
Fractional crystallisation from aqueous solution
Magnetic method
Fractional distillation
Which of the following pairs of substances illustrate the law of multiple proportions
CO and CO2
1.0 g of an oxide of A contained 0.5 g of A. 4.0 g of another oxide of A contained 1.6 g of A. The data indicate the law of
Reciprocal proportions
Constant proportions
Conservation of energy
Multiple proportions
Among the following pairs of compounds, the one that illustrates the law of multiple proportions is
Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of
Conservation of mass
Constant composition
Multiple proportions
Constant volume
Constant proportions
Conservation of mass
Multiple proportions
Reciprocal proportions
Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates
Law of reciprocal proportions
Law of constant proportions
Law of multiple proportions
Law of equivalent proportions
The law of multiple proportions was proposed by
Lavoisier
Dalton
Proust
Gay-Lussac
Chemical equation is balanced according to the law of
Multiple proportion
Reciprocal proportion
Conservation of mass
Definite proportions
Law of constant composition
Law of multiple proportions
Law of reciprocal proportions
Gay-Lussac’s law of gaseous volumes
Avogadro number is
Number of atoms one gram of element
Number of millilitres which one mole of a gaseous substances occupies at NTP
Number of molecules present in one gram molecular mass of a substance
All of these
Which property of an element is always a whole number
Atomic weight
Equivalent weight
Atomic number
Atomic volume