40. During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
(i) Column chromatography
(ii) Solvent extraction
(iii) Distillation
(iv) Thin layer chromatography
40. During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
(i) Column chromatography
(ii) Solvent extraction
(iii) Distillation
(iv) Thin layer chromatography
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1 Answer
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This is a Multiple Choice Questions as classified in NCERT Exemplar
40. Option (iv)
Thin layer chromatography is correct since thin layer chromatography is a method for analysing the mixtures by separating the components of the mixture. This technique can be used to determine the number of components in a mixture, the identity of compounds and the purity of compounds by observing the appearance of a product or the disappearance of a reactant. It can also be used to analyse the progress of a reaction.
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This is a Assertion Type Questions as classified in NCERT Exemplar
65. Option (i)
i.e., Both A and R are correct, and R is the correct explanation of A is the answer since in paper chromatography, a special quality of paper known as chromatography paper is used. Chromatography paper contains water molecules trapped in it which acts as the stationary phase. A strip of chromatography paper spotted at the base with the solution of the mixture is suspended in a suitable solvent or a mixture of solvents which acts as the mobile phase. The solvent rises up the paper by capillary action and flows over the spot. The paper selectively
This is a Assertion Type Questions as classified in NCERT Exemplar
64. Option (iii) i.e., Both A and R are not correct is the answer since sulphur is estimated by Carius method in the form of white precipitate of BaSO4 on heating with fuming and BaCl2. If light yellow solid is obtained means impurities are present. It is filtered, washed and then dried to get pure BaSO4 .
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63. Option (iv) i.e., A is not correct, but R is correct is the answer since hybridization of C can be found out by counting σ bonds and π bonds present on C atom. This can be shown as-
If C has 3σ bonds then it is sp2 hybridized. If C has 2σ bonds then it is sp hybridized.
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62. Option (i) i.e.,
Both A and R are correct, and R is the correct explanation of A is the answer as when two or more compounds differ in the position of substituent atom or functional group on the carbon skeleton, they are known as position isomers and this phenomenon is termed as position isomerism. Pent-2-ene and pent-l-ene are position isomers because they differ in the position of the double bond.
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61. Option (iv)
i.e., A is not correct, but R is correct is the answer. This is because canonical structures always have more energy than the resonance hybrid. Resonance hybrids are always found to be more stable than any of the canonical structures since the delocalization of electrons lowers the orbitals energy and gives stability.
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