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Questions and Answers
According to Beer-Lambert's law, absorbance (A) is directly proportional to the concentration (C) of the absorbing medium, when the path length (b) is constant.
According to Beer-Lambert's law, absorbance (A) is directly proportional to the concentration (C) of the absorbing medium, when the path length (b) is constant.
True (A)
Molar absorptivity (É›) is a constant known as absorptivity when the concentration is 1M and the path length is 1cm.
Molar absorptivity (É›) is a constant known as absorptivity when the concentration is 1M and the path length is 1cm.
False (B)
Absorptivity (a) can be calculated from the intercept of the curve produced by plotting absorbance (A) against concentration (C) when path length (b) is fixed.
Absorptivity (a) can be calculated from the intercept of the curve produced by plotting absorbance (A) against concentration (C) when path length (b) is fixed.
False (B)
A 1% solution of a substance has a molar absorptivity represented as A(1%, 1cm).
A 1% solution of a substance has a molar absorptivity represented as A(1%, 1cm).
Isosbestic point is a characteristic absorption profile exhibited by all substances regardless of their nature.
Isosbestic point is a characteristic absorption profile exhibited by all substances regardless of their nature.
Temperature has no effect on the absorbance of a substance according to Beer-Lambert's law.
Temperature has no effect on the absorbance of a substance according to Beer-Lambert's law.
At the isosbestic point, the absorbance is pH dependent.
At the isosbestic point, the absorbance is pH dependent.
An increase in temperature may cause hypsochromic shift in a solution.
An increase in temperature may cause hypsochromic shift in a solution.
The absorption of monochromatic light in an absorbing medium is only due to absorption (Ia) and refraction (If).
The absorption of monochromatic light in an absorbing medium is only due to absorption (Ia) and refraction (If).
The spectrum of a substance in polar solvents will be different from that in non-polar solvents.
The spectrum of a substance in polar solvents will be different from that in non-polar solvents.
Isosbestic point is the point at which two reactants are present in stoichiometric quantities.
Isosbestic point is the point at which two reactants are present in stoichiometric quantities.
Dilution of a dichromate solution with water leads to the formation of HCrO4.
Dilution of a dichromate solution with water leads to the formation of HCrO4.
Oxidation of diphenylamine converts its quinonoid spectrum to the benzenoid spectrum.
Oxidation of diphenylamine converts its quinonoid spectrum to the benzenoid spectrum.
An increase in temperature may shift ionic equilibrium.
An increase in temperature may shift ionic equilibrium.
A zero absorbance unit corresponds to 0% transmittance.
A zero absorbance unit corresponds to 0% transmittance.
Temperature has a significant effect on the UV spectrum of phenol.
Temperature has a significant effect on the UV spectrum of phenol.
Dilution of a solution may lead to less scattering of monochromatic light.
Dilution of a solution may lead to less scattering of monochromatic light.
Isosbestic point is where all spectra intersect at a specific wavelength (λ) and absorbance is both pH and concentration dependent.
Isosbestic point is where all spectra intersect at a specific wavelength (λ) and absorbance is both pH and concentration dependent.
