18 Questions
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
Molar absorptivity (ɛ) is a constant known as absorptivity when the concentration is 1M and the path length is 1cm.
False
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
A 1% solution of a substance has a molar absorptivity represented as A(1%, 1cm).
True
Isosbestic point is a characteristic absorption profile exhibited by all substances regardless of their nature.
False
Temperature has no effect on the absorbance of a substance according to Beer-Lambert's law.
False
At the isosbestic point, the absorbance is pH dependent.
False
An increase in temperature may cause hypsochromic shift in a solution.
False
The absorption of monochromatic light in an absorbing medium is only due to absorption (Ia) and refraction (If).
False
The spectrum of a substance in polar solvents will be different from that in non-polar solvents.
True
Isosbestic point is the point at which two reactants are present in stoichiometric quantities.
False
Dilution of a dichromate solution with water leads to the formation of HCrO4.
False
Oxidation of diphenylamine converts its quinonoid spectrum to the benzenoid spectrum.
False
An increase in temperature may shift ionic equilibrium.
True
A zero absorbance unit corresponds to 0% transmittance.
False
Temperature has a significant effect on the UV spectrum of phenol.
False
Dilution of a solution may lead to less scattering of monochromatic light.
False
Isosbestic point is where all spectra intersect at a specific wavelength (λ) and absorbance is both pH and concentration dependent.
False
Test your knowledge of how polar solvents interact with functional groups and the effects of temperature changes on ionic equilibrium. Explore the fundamental laws of light absorbance and the impact of temperature on color shifts in solutions
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