This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Diethyl ether is extensively used for solvent extraction because of : |
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Answer» High solubility of ORGANIC compounds in ETHER |
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| 2. |
Ether is : |
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Answer» Very active |
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| 3. |
Oxygen atom of ether is: |
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Answer» Very active |
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| 4. |
Diethyl ether is conveniently prepared in laboratory from |
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Answer» diazomethane |
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| 5. |
Diethyl ether is decomposed on heating with: |
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Answer» NaOH |
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| 6. |
Diethyl ether into n-butane |
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Answer» Solution :DIETHYL ETHER into n-butane: `C_(2)H_(5)-O-C_(2)H_(5)+underset("conc.(excess)")(2HI)overset(Delta)rarrunderset("ETHYL iodide")(2C_(2)H_(5)I)+H_(2)O` `underset("ethyl iodide")(C_(2)H_(5)I)+2Na+C_(2)H_(5)Iunderset(("Wurtz reaction"))overset("dry ether")rarrCH_(3)-underset("n-butane")(CH_(2))-CH_(2)-CH_(3)+2NaI` |
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| 7. |
Diethyl ether finds use in medicine as |
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Answer» A PAIN killer |
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| 8. |
Diethyl ether finds use in medicinc as ……………… . |
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Answer» a PAIN KILLER |
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| 9. |
Diethyl ether finds its use in medicine as |
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Answer» anaesthetic |
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| 10. |
Diethyl ether finds its use in medicine as: |
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Answer» PAIN killer |
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| 11. |
Diethyl ether exhibits metamerism with |
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Answer» `CH_3OCH_2CH_2CH_3` |
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| 13. |
Diethyl ether can be regarded as unhydride of |
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Answer» `CH_3-OH` |
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| 14. |
Diethyl ether does not react with : |
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Answer» SULPHURIC ACID |
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| 15. |
Diethyl ether can be distinguished from butan-1-ol by |
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Answer» AQ. `FeCl_3` |
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| 16. |
Diethyl ether can be distinguished from n-butanol by |
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Answer» aqueous `FeCl_(3)` `CH_(3)CH_(2)-O-CH_(2)CH_(3)+Na to "no ACTION"` `CH_(3)CH_(2)CH_(2)CH_(2)OH OVERSET(CrO_(3)+"dil." H_(2)SO_(4))to CH_(3)CH_(2)CH_(2)CHO overset("[O]")to CH_(3)CH_(2)CH_(2)COOH` |
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| 17. |
Diethyl ether by regareded as anhydride of : |
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Answer» `C_2H_5COOH` |
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| 19. |
Diethyl ether can be decomposed by heating with |
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Answer» NAOH |
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| 20. |
Diethyl ether can be decomposed with |
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Answer» DILUTE AQUEOUS `KMnO_4` |
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| 21. |
Diethyl ether and methyl n propyl ether are |
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Answer» POSITION isomers |
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| 22. |
Diethyl ether absorbs oxygen to form |
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Answer» Red coloured sweet SMELLING compound |
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| 23. |
Diethyl ether absorbs oxygen to from : |
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Answer» RED COLOURED SWEET SMELLING compound |
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| 24. |
Diethyl amine when treated with nitrosacidyields |
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Answer» diethyl alcohol `H_5C_2-undersetundersetH|N-C_2H_5+HONO overset(-H_2O)to underset"N-nitroso diethl amine ( yellow OILY liquid )"(H_5-oversetoverset(C_2H_5)(|)N-N=O)` |
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| 25. |
Diethyl -beta, beta-dimethylglutaric acid (ester) is condensed with diethyl oxalate in presence of sodium ethoxide and ethanol to from a major product (P), which on acidic hydrolysis followed by heating gives another product (Q). Calculate total number of C=O bonds in (P) and (Q) compounds? |
Answer»
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| 26. |
Diethyl carbonate on heating with ammonia gives : |
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Answer» `C_2H_5NH_2` |
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| 27. |
Diethyl amine when trated with nitrous acid yeilds |
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Answer» Diethyl ammonium nitrite |
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| 28. |
Diethyl amine on oxidation with KMnO_4 gives : |
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Answer» Ethanal |
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| 29. |
Diethyl amine ismore basicthan |
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Answer» `Ethylamine |
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| 30. |
Diethly ether is safe to heat if it does not gives: |
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Answer» blood RED colour with `FeSo(4)`+KCNS |
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| 31. |
Diels-Alder reaction will not take place with which ofthe following reactants? |
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Answer»
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| 32. |
"Dielectric substances are related to conductors. "Dielectric substances do not conduct electricity at normal condition" These are two arguments of a class discussion. Do you agree with these arguments? |
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Answer» |
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| 33. |
Dicyclic nitrogen bases are I) Adenine II) Cytosine Ill) Guanine IV) Thymine |
| Answer» Answer :A | |
| 34. |
Dicromate ion in acidic medium oxidizes stannous ion as XSn^(2+)+yCr_(2)O_(7)^(-2)+zH^(+)impliesaSn^(+4_)+bCr^(+3)+cH_(2)O a. The value of x:y is 1:3 |
| Answer» Solution :NA | |
| 35. |
Dichromate ion in acidic medium oxidizes stannous ion as. xSn^(2+) + yCr_2O_7^(-2) + zH^(+) rArr aSn^(+4) + bCr^(+3) + cH_2O (a) The value of x : y is 1 : 3 (b) The value of x + y + z may 18 (c) a : b is 3 : 2 (d) The value of z-c is 7 The correct code is - |
| Answer» Answer :B | |
| 37. |
Dichloromethane (CH_(2)Cl_(2)). |
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Answer» Solution :(1) Dichloromethane dissolves wide range of organic compounds, hence it is used as a solvent for many chemical reactions. (2) It is used as a solvent as a paint remover and DEGREASER. (3) It is used as prpellant in aerosols and as a FUMIGANT pesticide for grains and strawberries. (4) It is used to decaffinate tea of coffee. |
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| 38. |
Dichloromethane is also known as methylene chloride. |
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Answer» |
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| 39. |
Dichloroethylene does not show : |
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Answer» GEOMETRICAL ISOMERISM |
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| 40. |
Dichloro ethylene shows: |
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Answer» GEOMETRICAL isomerism |
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| 41. |
Dicarboxylic acids have two carboxylic groups, e.g., Acidity of dicarboxylic acid depends upon the stability of intermediate ion and upon the distance between two carboxylic groups. Shorter the distance between two carboxylic groups, greater is the acidic character. Melting point of these acids depends on the symmetry. Greater the symmetry, higher will be the melting point. Dicarboxylic acids on heating give monocarboxylic acid allkanes, cyclic ketones depending on the conditions Which of the following has highest melting point? |
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Answer» Maleic ACID |
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| 42. |
Dichlorination of propane leads to the formation of a mixture of different isomers. The number of isomers in the mixture is- |
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Answer» 2 |
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| 43. |
Dibutyl phthalate is commonly used as a liquid in manometers. What pressure in Nm^(-2)is equivalent to a centimetre of this liquid? The density of the liquid is 1.0465 g/cc. |
| Answer» SOLUTION :`102.63 NM^(-2)` | |
| 44. |
Diborane undergoes unsymmetrical cleavage reactions with: |
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Answer» dimethylamine |
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| 46. |
Diborane reacts with methylalcohol to give…………………… |
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Answer» |
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| 47. |
Diborane reacts with excess ammonia at high temperature to give…………………. . |
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Answer» BORON nitride |
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| 48. |
Diborane is potential rocket fuel which undergoes combustion according to the reaction, B_(2)H_(6(g))+3O_(2(g))rarr B_(2)O_(3(s))+3H_(2)O_((g))from the following data, calculate the enthalpy change for the combustion of diborane , {:(2B_((s))+(3)/(2)O_(2(g))rarrB_(2)O_(3(g)),,,Delta H=-1273 kJ),(H_(2(g))+(1)/(2)O_(2(g))rarr H_(2)O_((l)),,,Delta H=-28 kJ),(""H_(2)O_((l))rarr H_(2)O_((g)),,,Delta H=44 kJ),(2B_((S))+3H_(2)(g)rarr B_(2)H_(6(g)),,,Delta H=36 kJ):} |
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Answer» Solution :`B_(2)H_(6(g))+3O_(2(g))rarr B_(2)O_(3(g))+3H_(2)O_((g)) "" DELTA H = ?` MULTIPLY equation (2) and (3) by 3, add equation (1), (2) and (3) and then subtract equation (4) from that `{:(""2B_((s))+(3)/(2)O_(2(g))rarr B_(2)O_(3(g)) "," Delta H=-1273 kJ mol^(-1) "".......(1)),(""3H_(2(g))+(3)/(2)O_(2(g))rarr 3H_(2)O_((L)) "," Delta H =-286xx3"".......(2)),(ul(""3H_(2)O_((l))rarr 3H_(2)O_((g)) " ," Delta H=-44xx3 "".......(3)"")),("On ADDITION " 2B_((s))+3H_(2(g))+3O_(2(g))rarr B_(2)O_(3(g))+3H_(2)O_((g)) , Delta H=-1999),(ul(""2B_((s))+3H_(2(g))rarr B_(2)H_(6(g)) , Delta = 36"")),("On subtraction " B_(2)H_(6(g))+3O_(2(g))rarr B_(2)O_(3(g))+3H_(2)O_((g))" ,"Delta H=-2035 kJ mol^(-1)):}` |
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| 49. |
Diborane is a potential rocket fuel with undergoes combustion according to the reaction B_(2)H_(6)(g) + 3O_(2)_(g) to B_(2)O_(3)(s) + 3H_(2)O(g) From the following data, calculate the enthalpy change for the combustion of diborane. 2B(s) + 3/2O_(2)(g) to B_(2)O_(3)(g), DeltaH = -1273 kJ "mol"^(-1)........(1) H_(2)(g) + 1/2O_(2) (g) to H_(2)O(l), DeltaH = -286 kJ"mol"^(-1).........(2) H_(2)O(l) to H_(2)O(g), DeltaH= 44 kJ "mol"^(-1) H_(2)O(l) to H_(2)O(g), DeltaH = 44 kJ "mol"^(-1).........(4) 2B(s) + 3H_(2)(g) to B_(2)H_(8)(g), DeltaH = 36 kJ"mol"^(-1)............(5) |
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Answer» Solution :Finally, we have to get, `B_(2)H_(6)(g) + 3O_(2)(g) to B_(2)O_(3)(s) + 3H_(2)O(g)` MULTIPLY equation (2) and (3) by 3, add 1,2,3 and substract (4) from that (i) `2B(s) + 3//2 O_(2)(g) to B_(2)O_(3)(s), DeltaH = -1273 KJ "mol"^(-1)` (II) `3H_(2)(g) + 3//2O_(2)(g) to 3H_(2)O(l), DeltaH = -286 xx 3 kJ"mol"^(-1)` (III) `3H_(2)O(l) to 3H_(2)O(g), DeltaH = 132 kJ"mol"^(-1)` (iv) `B_(2)H_(6)(g) to 2B(s)+ 3H_(2)(g), DeltaH = -36 kJ"mol"^(-1)` --------------------------------------------------------------------------------- `B_(2)H_(6)(g) + 3O_(2)(g) to B_(2)O_(3)+ 3H_(2)O(g), DeltaH= -2035 kJ "mol"^(-1)` |
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