Practical Organic Chemistry PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Practical Organic Chemistry · Set 1 (Q1-12)
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1. $By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is : (nearest integer) (Given, molar mass in gmol^{- 1} : O = 16, Mg = 24, P = 31)$ (1) $30$ (2) $50$ (3) $40$ (4) $20$ 2. $Given below are two statements : Statement I : A mixture of chloroform and aniline can be separated by simple distillation Statement II : When separating aniline from a mixture of aniline and water by steamdistillation aniline boils below its boiling point choose the most appropriate answer from the options given below$ (1) $Statement is true, statement II is false$ (2) $Both Statement I and Statement II are true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is false, Statement II is true$ 3. $The principle of column chromatography is:$ (1) $Gravitational force$ (2) $Capillary action.$ (3) $Differential solubility of the substances in the mobile phase.$ (4) $Differential adsorption of the substances on the solid phase.$ 4. $Match List - I with List - II List - I (Separation of) (A) Aniline from aniline-water mixture (B) Glycerol from spent-lye in soap industry (C) Different fractions of crude oil in petroleum industry (D) Chloroform-Aniline mixture List - II (Separation Technique) (I) Simple distillation (II) Fractional distillation (III) Distillation at reduced pressure (IV) Steam distillation Choose the correct answer from the options given below:$ (1) $(A)-(IV), (B)-(III), (C)-(II), (D)-(I)$ (2) $(A)-(I), (B)-(II), (C)-(III), (D)-(IV)$ (3) $(A)-(III), (B)-(IV), (C)-(I), (D)-(II)$ (4) $(A)-(II), (B)-(I), (C)-(IV), (D)-(III)$ 5. $Glycerol is separated in soap industries by$ (1) $Fractional distillation$ (2) $Differential extraction$ (3) $Distillation under reduced pressure$ (4) $Steam distillation$ 6. $The correct match between Item I and Item II is: Item I (Mixture) Item II (Separation method) (A) H2O: Sugar (P) Sublimation (B) H2O : Aniline (Q) Recrystallization (C) H2O : Toluene (R) Steam distillation (S) Differential extraction$ (1) $(A) \to (S); (B) \to (R); (C) \to (P)$ (2) $(A) \to (Q); (B) \to (R); (C) \to (S)$ (3) $(A) \to (R); (B) \to (P); (C) \to (S)$ (4) $(A) \to (Q); (B) \to (R); (C) \to (P)$ 7. $In chromatography, which of the following statement is INCORRECT for R_{f} ?$ (1) $R_{f} value depends on the type of chromatography.$ (2) $The value of R_{f} can not be more than one.$ (3) $Higher R_{f} value means higher adsorption.$ (4) $R_{f} value is dependent on the mobile phase.$ 8. $Match List - I with List - II. List - I (Purification technique) (A) Distillation (simple) (B) Fractional distillation (C) Distillation under reduced pressure (D) Steam distillation List-II (Mixture of organic compounds) (I) Diesel + Petrol (II) Aniline + Water (III) Chloroform + Aniline (IV) Glycerol + spent-lye Choose the correct answer from the options given:$ (1) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ (2) $(A)-(III), (B)-(IV), (C)-(II), (D)-(I)$ (3) $(A)-(II), (B)-(IV), (C)-(I), (D)-(III)$ (4) $(A)-(II), (B)-(III), (C)-(IV), (D)-(I)$ 9. $If dichloromethane (DCM) and water (H_{2} O) are used for different extraction, which of the following statements is correct ?$ (1) $DCM and H_{2} O would stay as lower and upper layer respectively in the S.F.$ (2) $DCM and H_{2} O will make turbid/colloidal mixture$ (3) $DCM and H_{2} O would stay as upper and lower layer respectively in the separating funnel (S.F.)$ (4) $DCM and H_{2} O will be miscible clearly$ 10. $A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethyl acetate (20 : 80), the sequence of obtained compounds is$ (1) $(B), (C) and (A)$ (2) $(A), (B) and (C)$ (3) $B, (A) and (C)$ (4) $C, (A) and (B)$ 11. $Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI. [NEET 2024](A) Al^{3 +} (B) Cu^{2 +} (C) Ba^{2 +} (D) Co^{2 +} (E) Mg^{2 +} Choose the correct answer from the options given below.$ (1) $B, A, D, C, E$ (2) $B, C, A, D, E$ (3) $E, C, D, B, A$ (4) $E, A, B, C, D$ 12. $Which of the following is 'a' FALSE statement?$ (1) $Carius tube used in the estimation of sulphur in an organic compound$ (2) $Kjedahl's method is used for the estimation of nitrogen in an organic compound$ (3) $Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg_{2} P_{2} O_{7} by adding magnesia mixture$ (4) $Carius method is used for the estimation of nitrogen in an organic compound$