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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following will not give white precipitate with ammoniacal silver nitrate solution ?A. `CH_(3)-C-=C-CH_(3)`B. C. D. |
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Answer» Correct Answer - A::B::C |
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| 2. |
Which of the following will not give white precipitate with ammoniacal silver nitrate solution ?A. `CH_(3)-C-=C-CH_(3)`B. C. D. |
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Answer» Correct Answer - A::B::C |
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| 3. |
A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating with Zn and `NH_(4)Cl` followed by `AgNO_(3) + NH_(4)OH` solution . The mixture contains :A. B. C. D. |
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Answer» Correct Answer - A |
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| 4. |
A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating with Zn and `NH_(4)Cl` followed by `AgNO_(3) + NH_(4)OH` solution . The mixture contains :A. B. C. D. |
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Answer» Correct Answer - A |
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| 5. |
A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating with Zn and `NH_(4)Cl` followed by `AgNO_(3) + NH_(4)OH` solution . The mixture contains :A. B. C. D. |
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Answer» Correct Answer - C `-NO_(2)` group gives +ve test with `Zn//NH_(4)Cl` followed by `AgNO_(3)+NH_(4)OH` solution. |
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| 6. |
An organic compound which produces a bluish green coloured flame can heating in presence of copper isA. ChlorobenzeneB. BenazaldehydeC. AnilineD. Benzoic acid |
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Answer» Correct Answer - A If a clean copper wire in contact with a halogen containing compound is placed in a flame, the presence of halogen is reveated by a green to blue colour. |
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| 7. |
When an organic compound is present in aqueous medium and is less soluble in any organic solvent, then it is separated by `:`A. continous extractionB. distillationC. chromatographyD. sublimation |
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Answer» Correct Answer - A |
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| 8. |
Carbon and hydrogen are normally detected by strongly heating the organic compound withA. FeOB. CaOC. CuOD. MnO |
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Answer» Correct Answer - C |
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| 9. |
An organic veolved from the treatement of `0.30g` ofan organic compound for the estimation for the of nitrogen was passed in `100ml`of `0.1 M` sulphuric acid. The excess of acid required 20ml of `0.5 M` sodium hydroxide solution for complete neutralization . The organic compound isA. `CH_(3NXO`B. `CH_(3)CONH_(2)`C. `(NH_(2))CO`D. `CH_(3)CH_(2)CONH_(2)` |
| Answer» Correct Answer - C | |
| 10. |
If `0.228 g` of silver salt of dibasic acidgave a residue of `0.162 g` of silver of ignition then molecular weight of the acid isA. 70B. 80C. 90D. 100 |
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Answer» Correct Answer - C Mass of silver salt taken `= 0.228 gm` Mass of silver left `= 0.162gm` Basicity of acid `= 2` Step 1 : To calculate the equivalent mass of the silver salt (E ). `(" Eq.mass of silver salt")/(" Eq. mass of silver ") = (" Mass of acid taken ")/(" Mass of silver left ")` `= E/ 108 = (0.0228)/(0.162)` `= E = (0.228)/(0.162) xx 108 = 152` (Eq. mass of silver salt) Step 2. to calculate the eq. mass of acid . Eq. mass of acid = Eq. mass of silver salt - Eq. mass of Ag + Basicity `= 152- 108 +1 = 152 - 107 = 45` (Eq. mass of acid) Step 3 : To determine the molecular mass of acid. Mol. mass of the acid = Eq. mass of acid `xx` basicity `= 45 xx 2 = 90`. |
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| 11. |
Steam distillation is used to purify a compound which is steam principle volatile and insoluble in water. The impurities should not be steam volatile. It is based on the principle that liquid will boil when partial vapour presure of liquid and partial vapour pressure of steam both become equal to atmospheric presure `P=p_(1)+p_(2)`. It reduces the boiling point of liquid. `("Wt. of water distilled")/("Wt. of substance distilled")=` `("M. Wt. of water" xx V.P. " of steam")/(M. Wt. "of substance" xx "V.P. substance")` Whilch of the following is steam volatile?A. o- nitrophenolB. p-nitophenolC. p-hydroxybenzaldehydeD. Ethanol |
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Answer» Correct Answer - A o- Nitrophenol is steam volatile i.e. vapourised by steam whereas others are not |
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| 12. |
In the Lassaigne’s test, the blood red colouration is due to the formation of A. `Fe(CNS)`B. `NaCNS`C. `NH_(4)CNS`D. `Fe(CNS)_(3)` |
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Answer» Correct Answer - D Ferric thiocynanate or sulphocyanide, `Fe(CNS)_(3^(+))` |
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| 13. |
The reactionof nitroprusside anion with sulphide ion gives purple colouration due to the formation ofA. The tetranionic complex of iron (II) coordinating to one `NOS^(-)` ionB. The dianionic complex of iron (II) coordinating to one `NOS^(-)` ionC. The trianionic complex of iron (III) coordinating to one `NOS^(-)` ionD. The tetranionic complex of iron (III) coordinating to one `NCS^(-)` ion |
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Answer» Correct Answer - A `Na_(2)S + underset(" Sod. Nitroprusside")(Na_(2)[Fe(CN)_(5)NO]) rarr underset(" Violet colour")(Na_(4)[Fe(CN)_(5)NOS])` `[Fe^(+2)(CN)_(5)^(-5)NOS]^(-4) rArr` Tetra anionic complex of iron (II) co-ordinating to one `NOS^(-)` ion. |
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| 14. |
Which of the following compounds will give isocyanide on reaction with `CHCl_(3) + KOH` ?A. B. C. D. |
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Answer» Correct Answer - A::C |
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| 15. |
KOH can be used as drying agent forA. AminesB. PhenolsC. AcidsD. Esters |
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Answer» Correct Answer - A Amines is correct because they do not react with KOH because both amines and KOH are bases. Restcan react. |
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| 16. |
Which of the substance is purified by sublimationA. Benzoic acidB. CamphorC. NaphthaleneD. All of these |
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Answer» Correct Answer - D Benzoic acid, comphor and naphthalene sublime on heating hence, they are purified by sublimation method. |
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| 17. |
Styrene can be purified byA. Simple distillationB. Fractional distillationC. Steam distillationD. Vacuum distillation |
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Answer» Correct Answer - D Styrene can be purified by vacuum distillation. |
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| 18. |
Anthracene can be purified byA. DistillationB. SublimationC. FiltrationD. Fractional distillation |
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Answer» Correct Answer - B (b) is used because anthracene can sublime. (a) isnot used because anthracene is solid. (c ) is not used because flitration is used only to remove suspended impurity. (d ) is not correct because it is used in case of liquids. |
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| 19. |
Ammonium molybdate is used for detection of which element in organic compound :A. CB. NC. PD. S |
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Answer» Correct Answer - C |
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| 20. |
A: Secondary amines and phenols undergo Liebermann nitroso reaction. R: Secondary amines are move basic than primary amines.A. Both A and R are true and R is correct explanation of AB. Both A and R are true but R is not correct explanation of AC. A is true R is false.D. A is false, R is true |
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Answer» Correct Answer - B Both (A) to (R) are correct but (R) is not correct explanation of (A). |
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| 21. |
Compound (A)`C_(7)H_(8)O` is insoluble in aqueous `NaHCO_(3)` and dissolves in aqueous NaOH and gives a characteristic colour with neutral `FeCl_(3)` . When treated with `Br_(2)`(A) forms compound `(B) C_(7)H_(5)O Br_(3)`. What could be the structure of compound (A) if neither dissolves in aq. `NaHCO_(3)` nor gives a characteristic colour with `FeCl_(3)`?A. B. C. D. |
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Answer» Correct Answer - A::B |
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| 22. |
Compound (A)`C_(7)H_(8)O` is insoluble in aqueous `NaHCO_(3)` and dissolves in aqueous NaOH and gives a characteristic colour with neutral `FeCl_(3)` . When treated with `Br_(2)`(A) forms compound `(B) C_(7)H_(5)O Br_(3)`. The most probable structure of compound A is :A. B. C. D. |
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Answer» Correct Answer - B |
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| 23. |
Compound (A)`C_(7)H_(8)O` is insoluble in aqueous `NaHCO_(3)` and dissolves in aqueous NaOH and gives a characteristic colour with neutral `FeCl_(3)` . When treated with `Br_(2)`(A) forms compound `(B) C_(7)H_(5)O Br_(3)`. The structure of compound (B) would be :A. B. C. D. |
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Answer» Correct Answer - B |
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| 24. |
The decomposition of organic compounds in the presence of oxygen and without formation of odoriferous substances, is calledA. DecayB. `N_(2)` fixationC. NitrificationD. Denitrification |
| Answer» Correct Answer - A | |
| 25. |
above compounds (P) & (Q) can be differentiated by :A. amm. `AgNO_(3)`B. `NaOH`C. `FeCl_(3)`D. Both (a) & (b) |
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Answer» Correct Answer - D `P overset(AgNO_(3))rarr AgCl darr` (ppt.) |
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| 26. |
Above compounds can be differentiated by the salicylate. Which of the following chemical test ? (used in decreasing order)A. `NaOH, FeCl_(3), NaHCO_(3)`B. aq. `NaHCO_(3), FeCl_(3), NaOH`C. `NaOI, NaOH, NaHCO_(3)`D. `NaOH, Na, NaHCO_(3)` |
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Answer» Correct Answer - B `FeCl_(3)` test for enol. |
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| 27. |
can be differentiated by :A. carbylamine reactionB. iodoform testC. cold `KMnO_(4)`D. `Br_(2)-H_(2)O` |
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Answer» Correct Answer - A |
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| 28. |
Empirical formula of a hydrocarbon containing `80%` carbon and `20%` hydrogenisA. `CH`B. `CH_(2)`C. `CH_(3)`D. `CH_(4)` |
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Answer» Correct Answer - C `{:("Element"," NO. of moles"," Simple ratio"),(C80%,80//12=6.66,1),(H20%,20//1=20,3):}` Hence, Empirical Formula `= CH_(3)`. |
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| 29. |
Precentage composition of an organic compounds is as follows, `C = 10.06 , H = 0.84, Cl = 89.10`. Which of the following corresponds to its molecular formula if the vapour density is `60.0`A. `CH_(2)Cl_(2)`B. `CHCl_(2)`C. `CH_(3)Cl`D. None of these |
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Answer» Correct Answer - B Molecular of weight of `CHCl_(3)` is `120`. |
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| 30. |
Assertion : Refining of pendulum involves fractional distillation. Reason : Fractional distillation involves repeated distillation.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reson is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
| Answer» Correct Answer - B | |
| 31. |
Which of the following statements are correctA. An organic compound is pure if mixed melting point is sameB. Ethanol and water can be separated by azetropic distillation because if forms azotropeC. Impure aniline is purified by steam distillation as it is steam volatileD. Glycerol is purified by vacuum, distillation it decomposes at its normal boiling point |
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Answer» Correct Answer - A::B::C::D All are are correct statement. (a) is correct because impurities lower the melting point. (b) is correct it is the usual method. (c ) is correct as it is the usual method. (d) is correct as vecuum distillation is done for compounds which decompose below the boiling point. |
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| 32. |
Empirical formula of a compound is `CH_(2)O` and its vapour density is `30`. Molecular formula of the compound isA. `C_(3)H_(6)O_(3)`B. `C_(2)H_(4)O_(2)`C. `C_(2)H_(4)O`D. `CH_(2)O` |
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Answer» Correct Answer - B Empirical Formula `= CH_(2)O` Empirical formula mass `= 12 + 12 + 16 = 30` Mol.Mass `= 2 xx V.D. = 2 xx 30 = 60` `n = ("Mol.mass")/(" Empirical mass") = 60/30= 2` Molecular formula `= (" Empirical formula")_(n)` `= (CH_(2)O)_(2) = C_(2)H_(4)O_(2)`. |
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| 33. |
A hydrocarbon has density `1.25 gL^(-1)`at `STP` . The hydrocarbon isA. `C_(2)H_(4)`B. `C_(2)H_(2)`C. `C_(2)H_(6)`D. `C_(3)H_(6)` |
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Answer» Correct Answer - A 1L of hydrocarbon at STP weighs `= 1.25 g` `22.4 L` of hydrocarbon at STP weigh `= 1.25 xx 22.4 = 5/4 xx 22.4 = 28.0 g mol^(-1)` Hydrocarbon will be `C_(2)H_(4) = 2xx 12 + 4 = 28 g mol^(-1)` (b) , (c ) and (d) are not possible. |
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| 34. |
A positive carbylamine test is given by:A. N, N-dimethylanilineB. 2, 4-dimethylanilineC. N-methyl - o - methylanilineD. p-methylbenzylamine |
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Answer» Correct Answer - B::D Only primary amine gives carbylamine test. Hence `2,4-`dimethylaniline and p-methyl benzylamine both give this test. |
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| 35. |
To differentiate between carbon-12, carbon-13 and carbon-14, the instrument that you would use isA. Infra-red spectrometerB. Atomic absorption spectrometerC. Mass spectrometerD. Ultraviolet spectrometer |
| Answer» Correct Answer - C | |
| 36. |
Assertion : During digestion with concentrated `H_(2)SO_(4)`, Nitrogen of the organic compound is converted into `(NH_(4))_(2)SO_(4)`. Reason : `(NH_(4))_(2)SO_(4)`On heating with akali liberates`NH_(3)`.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reson is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
| Answer» Correct Answer - B | |
| 37. |
Assertion : Potassium can be used in lassaigne test. Reason : Potassium reacts vigorously.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reson is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
| Answer» In lassaigne test potassium can not becaused in place of sodium as potassium reacts vigorusly and its use causes explosion. | |
| 38. |
`58 ml` of `N/5 H_(2)SO_(4)` are used to neutralize ammonia given by 1 g of organic compound. Percentage of nitrogen in the compoundisA. `34.3`B. `82.7`C. `16.2`D. `21.6` |
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Answer» Correct Answer - C `%` of `N = (1.4 xx " Normality of acid" xx " Volume of acid")/(" Mass of substance")` `= (1.4 xx 1 xx 58)/(1 xx 5) = 16.2` |
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| 39. |
When `32.25` gm ethyl chloride dehydrohalogenated. It gives `50%` alkene what is the mass of product. (Atomic mass of chlorine `= 35.5`)A. 14 gmB. 28 gmC. `64.5` gmD. 7 gm |
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Answer» `CH_(2)H_(5)Cloverset(-HCl)rarrC_(2)H_(4)` `{:(64.5" "28),(32.25" "14):}` `64.5gm C_(2)H_(5)Cl` gives `28 gm` of `C_(2)H_(4)` `32.25 gm C_(2)H_(5)Cl` gives `= (28 xx 32.25)/(64.5) = 14` `= 14 gm` of `C_(2)H_(4)` Obtained producted is `50%` so mass of obtained alkene `=(14)/(2) = 7 gm`. |
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| 40. |
The estimation of available chlorine in bleaching powder is done byA. Acid-base titrationB. Permagnometric titrationC. Iodimetric titrationD. Iodometric titration |
| Answer» Correct Answer - D | |
| 41. |
The percentage composition of a compound `C=90%` and `H=10%`. A possible formula of the compounds isA. `C_(8)H_(10)`B. `C_(15)H_(30)`C. `C_(15)H_(20)`D. `C_(15)H_(15)` |
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Answer» Correct Answer - C `C:H=90/12:10/1=3:4` Therefore empirical formula `=C_(3)H_(4)`. Since M.F. in `n` times E.F., therefore the M.F. of the hydrocarbon `=C_(15)H_(20)` |
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| 42. |
Accurate determination of atomic masses is done with the instrument called isA. SpectrophotometerB. Mass spectrometerC. Atomic absorption spectrometerD. Calorimeter |
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Answer» Correct Answer - B Atomic masses, determined by the mass spectrometer. |
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| 43. |
Chromatograophy is a valuable method for the separation, isolation,purification of the constituents of a mixture and it is based on general principle ofA. Phase ruleB. Phase distributionC. Interphase separationD. Phase operation |
| Answer» Correct Answer - A | |
| 44. |
The purification of a organic compound is varified withA. Melting pointB. Molecular weightC. DensityD. Solubility in water |
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Answer» Correct Answer - A Sharp m.p. (in case of solids) and boiling point ( in case of liquids) are used as criteria for purity because their determination is feasible in the laboratory. |
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| 45. |
The best method for the separation of naphthalene and benzoic acid form their mixture isA. ChromatographyB. CrystallisationC. DistillatoinD. Sublimation |
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Answer» Correct Answer - B Mixtureof benzoic acid and naphthalene can be separated from hot water in which benzoic acid dissolves but naphthalene does not. |
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| 46. |
The empirical formula of a compound is `CH_(2)O` and its molecular mass is 120. The molecular formula of the comound isA. `C_(2)H_(4)O_(2)`B. `C_(3)H_(6)O_(3)`C. `C_(4)H_(8)O_(4)`D. `CH_(2)O` |
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Answer» Correct Answer - C Empirical formula weight of the compound `12+2+16=30` `n=("mol.wt.")/("Emp.formulawt.")=120/30=4` `:.` molecular formula of the compound is `(CH_(2)O)_(4)=C_(4)H_(8)O_(4)` |
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| 47. |
Mixed melting point of an organic compound is determine toA. check the purity of an organic compoundB. check whether the two compounds are sameC. check whether the two compounds are differentsD. check whether the two compounds can be separated by fractional crystallization. |
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Answer» Correct Answer - A::B::C To check is purity and also to check whether the two compounds are same or different. |
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| 48. |
The least technique for the purification of organic compounds isA. Fractional distillationB. ChromatographyC. Vacuum distillationD. Crystallisation |
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Answer» Correct Answer - B Chromatography is the latest for the purification of organic compounds. Chromatography are of various tupe viz. Column chromatography, gas chromotography, paper cgromatography etc. |
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| 49. |
The best method for the separation of naphthalene and benzoic acid from their mixture isA. SublimationB. DistillationC. CrystallizationD. Chromatography |
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Answer» Correct Answer - C Crystallization will water can be used |
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| 50. |
Chromatography technique is used in the separation of:A. Volatile liquidsB. GlycerolC. Plant pigmentsD. Sugars |
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Answer» Correct Answer - B::C::D Amino acid, plant pigments and sugars. |
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