Catalytic properties of a substance may be best defined as a
phenomenon of
1 Absorption
2 Chemisorption
3 Adsorption
4 None of these
The dark lines in the solar spectrum are due to 1 Absorption of corresponding wavelengths by the prism used in he spectrograph 2 Destructive interference between waves of certain definite wavelengths 3 Absorption of corresponding wavelengths by the outer layers of the sun 4 None of these
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The recent atomic weight scale is based on 1 1H1 2 1H2 3 6C12 4 8O16
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The filament of an electric bulb is made of 1 Iron 2 Nichrome 3 tungsten 4 Graphite
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Which of the following is the basis of modern periodic table? 1 Atomic mass 2 Atomic number 3 Atomic size 4 Atomic volume
atoms are composed of Electrons & Protons or Electrons & Protons ?
The ratio of pure gold in 18 carat gold is 1 60% 2 75% 3 80% 4 100%
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