Related InterviewSolutions

• Percentage of `Se` (atomic mass `= 78.4 u`) in peroxidase anhydrase enzyme is `0.5%` by mass. The minimum molecular mass of peroxidase anhydrase enzyme isA. `136xx10^(4)`B. `568xx10^(3)`C. `15.28`D. `568 xx 10^(4)`
• In Carius tube, the compound `ClCH_(2)COOH` was heated with fuming `HNO_(3)` and `AgNO_(3)`. After filtration and washing, a white precipitate was formed. The precipitate is ofA. `AgCl`B. `AgNO_(3)`C. `Ag_(2)SO_(4)`D. `CH_(2)ClCO OAg`
• By the process of cystallization, we convert an impure compound into its crystals. The choice of the solvent is very crucial in this operations. Which of the following conditions must be fulfilled by the selected solvent? (i) It should not react chemically with the impure organic compund. (ii) Is should be the one in which the solid organic compound is very soluble at room temperature. (iii) The impurities should not dissolve at all in the solvent. (iv) If the impurities dissolve, they should be soluble to such an extent that they remain in the filtrate (mother liquor) upon crystallization.A. (i), (iii), (iv)B. (i), (ii), (iii)C. (i), (ii), (iv)D. (i), (ii), (iii), (iv)
• In case the difference in solubilty ofhte two substances in the solvent is not very marked, ………….., involving a series of repeated vrystallizations, is carried out.A. fractional crystallizationB. vacuume crystallizationC. ultra crystallizationD. multiple crystallization
• For the purification of organic compounds, the latest technique followed isA. steam distillationB. chromatographyC. fractional crystallizationD. sublimation
• The solvent for crystallization is usually selected by trial and error using small samples. The commonest solvents are water, alcohol or methylated spirits, glacial acetic acid, ete. Which of the following solvents are least describle ? (i) Ether (ii) Acetone (iii) Benzene (iv) PetrolA. (ii), (iii)B. (i), (iv)C. (i), (iii)D. (iii), (iv)
• Which of the following types of chromatography is refered to as liquid/liquid chromatography?A. Paper chromatographyB. Gas chromatographyC. Thin layer chromatographyD. Column chromatography
• Which of the following solvents is used to separated benzoic acid and anthracene by the process of filtration ?A. Cold waterB. Hot waterC. EtherD. Benzene
• Which of the following technique is most suitable for the purification of cyclohexanone from a mixture containing benzoic acid, isoamyl alcohol, cyclohexane, and cyclohexanone?A. CrystallizationB. SublimationC. Gas chromatographyD. `IR` spectrography
• Which of the following types of chromatography enables us to make accurate quantitative analysis of the mixtures of gases, liquids, and volatile solids?A. Paper chromatographyB. Gas chromatographyC. Thin layer chromatographyD. Column chromatography