Explore topic-wise InterviewSolutions in Current Affairs.

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.	Phenoland benzoicacid may bedistinguishedby theirreaction with .
Answer» aqueousNaOH AQUEOUS `NaHCO_(3)` neutral `FeCl_(3)` aqueous `NH_(3)` Answer :B::C

2.	Phenol and benzoic can be separated by
Answer» `NaHCO_(3)` `NaOH` SOLUTION `FeCl_(3)` solution All of these Solution :Phenol does not react with `NaHCO_(3)`whereas benzoic acid will react to form sodium salt which can be hydrolysed to GET benzoic acid back. (b) Both will react with NaOH, THEREFORE `NAOH` cannot be used for SEPARATION. (c )Phenol forms complex with `FeCl_(3)` from which phenol cannot be recovered, therefore cannot be used. (d ) is not possible,

3.	phenol and benzoic acid may be distinguished their reaction with
Answer» aqueous NaOH aqueous `NaHCO_(3)` NEUTRAL `FeCl_(3)` `Br_(2)-H_(2)O` Answer :B::C::D

4.	Phenol and benzoic acid can be distinguished by
Answer» Conc. `H_(2)SO_(4)` Aqueous NaOH Aqueous `Na_(2)CO_(3)` Aqueous `NaHCO_(3)` Answer :D

5.	Phenoland benzoic acid is distinguished by
Answer» NaOH `NaHCO_(3)` `Na_(2)CO_(3)` `H_(2)SO_(4)` Answer :B

6.	Phenetole is …..
Answer» DIPHENYL ether ETHOXY BENZENE Methoxy benzene DIETHYL ether Solution :Ethoxy benzene

7.	phenol act as
Answer» analgesc antiseptic disimfectant both 'B' and 'C' ANSWER :D

8.	Phenetole react with cold HI gives
Answer» `C_6H_5-I+C_2H_5-OH` `C_2H_5-I+C_6H_5-OH` `C_6H_5CH_2-OH+C_2H_5-I` `C_6H_5-OH + CH_3-CH_2-CH_2OH` ANSWER :B

9.	Phenol and benzoic acid are separated by:
Answer» `NaHCO_(3)` NaOH NA `NaNH_(2)` Solution :`PhOh+NaHCO_(3)rarr"No reaction "` `PhCOOH+NaHCO_(3)rarrPhCOunderset(("salt"))overset(Θ)O Na^(o+)+H_(2)O+CO_(2)`

10.	Phenol.
Answer» Solution :(1) Phenol is USED in the preparation of phenol-formaldehyde polymer which is used in a plastic BAKELITE. (2) It is used in the preparation of phenol-phthalein-an indicator and in certain dyes. (3) It is used in the preparation of drugs such as SALOL, aspirin, etc. (4) It is used in the preparation of DETTOL, which is an antiseptic. (5) It is used in the preparation of 2,4-dichlorophenoxy acetic acid which is used as selective weed killer. (6) It is used to prepare picric acid which is used as explosive.

11.	phenelzine is used in
Answer» DEPRESSION HIGH fever hyperacidity high inflammation Answer :A

12.	Phenelzin is used as an
Answer» ANALGESIC ANTISEPTIC ANTIPYRETIC ANTIDEPRESSANT ANSWER :D

13.	PhCOOH, PhCH_3 can be separated by
Answer» `KMnO_4` AQ. `NaHCO_3` + n-hexane `H_2O` NONE of these SOLUTION :PhCOOH DISSOLVES in aq. `NaHCO_3` solution.

14.	Phenacetin is used as
Answer» ANTIPYRETIC ANTISEPTIC antimalarial Analgesic ANSWER :A

15.	Phenacetin is used as :
Answer» Antipyretic Antiseptic Antimalarial Analgesic ANSWER :A

16.	PhCOOC_(2)H_(5)+C_(2)H_(5)-COOHC_(2)H_(5) overset(NaNH_(2))(to) Number of condensated products (including stereoisomer)
Answer» SOLUTION :

17.	PhCOCH_(2)CH_(2)NH_(2) and PhNHCH_(2)COCH_(3) can be distinguished by
Answer» Carbylamine TEST Tollen's test Hinsberg's test Iodoform test Solution :`1^(@)` amines GIVE this `"REA"^(N)`

18.	PhCHO+(CH_3CO)_2Ooverset(CH_2COONa)toAoverset(HBr)toB The product B is
Answer» `PhCH=CHCH_2Br` `Phundersetunderset(Br)(\|)CH-CH_2-COOH` `PhCH_2CH(Br)COOH` PhCH=CH-COBr Solution :PERKIN's reaction + Markownikov's addition of HBR.

19.	PhCH_(2)CH_(2)COOH overset(Ag_(2)O)to PhCH_(2)CH_(2)COOAg overset(Br_(2))to PhCH_(2)CH_(2)Br+CO_(2)+AgBr The reaction is known as Hunsdiecker reaction. Choose incorrect statement(s) regarding the Hunsdiecker reaction.
Answer» A more convenient WAY to preform the Hunsdiecker REACTION is the use of a mixture of acid and mercuric oxide. Reaction involves radical intermediates. The yield of bromide increases as `1^(@) "ALKYL" lt 2^(@) "alkyl" lt 3^(@) "alkyl"`. The reaction starts with decarboxylation. Solution :Yield increases as `3^(@) "alkyl" lt 2^(@) "alkyl" lt 1^(@) "alkyl"`. Decarboxylation takes place, but in the propagation STEP

20.	PhCHO +(CH_(3)CO)_(2)O overset((1)CH_(3)COONa)underset((2)"hydrolysis", Delta)toA overset(HBr)toB B The product B is
Answer» `PhCH=CHCH_(2)Br` `Phunderset(Br)UNDERSET(\|)(C)H-CH_(2)-COOH` `PhCH_(2)CH(Br)COOH` `PhCH=CH-COBr` Solution :Perkin REACTION `underset("(A)")(Ph-CH=CH-COOH) overset(HBR)to Ph-underset(Br)underset(\|)(C)H-CH_(2)-COOH`

21.	Ph(CH_2)_3 -oversetoverset(O)(\|\|)C-Cloverset(AlCl_3)to(X)overset(Na_2Cr_2O_7. H^(+)"heat")to(Y)overset("heat")to(Z)
Answer» SOLUTION :

22.	PHBV is prepared from
Answer» glycolic ACID 3 -HYDROXY BUTANOIC acid and 3-hydroxy pentanoic acid GLYCINE and `omega` AMINO caproic acid glycine and 3 -hydroxy butanoic acid Answer :B

23.	PhC-=CPh overset(Hg^(2+)+H^(o+))to(A). The compound (A) is The compound (A) is:
Answer» a. b. c. d. Solution : HENCE the ANSWER is `(a)`.

24.	PHBV is of which class polymer ?
Answer» POLYESTER POLYAMIDE Polycynide Polyethene Solution :Polyester

25.	PHBV is a biodegradable polymer and is obtained by copolymerization of ....................with ...................
Answer» ANSWER :3-hydroxybutanoic ACID , 3-hydroxypentanoic acid

26.	Phase transitions are ubiquitous in nature. We are all familiar with the different phase of water (vapour, liquid and ice) and with the change from one to another, the change of phase are called phase transitions. There are six ways a substance can change between these three phase, melting, freezing, evaporating, condensing sublimation and decomposition. At 1 atm pressure vaporisation of 1 mole of water from liquid (75^(@)C) to vapour (120^(@)C). C_(v)(H_(2)O,l)=75 J "mole"^(-1)K^(-1), C_(p)(H_(2)O,g)=33.3J"mole"^(-1)K^(_1) Delta H_(vap) at 100^(@)C=40.7KJ//"mole" Calculate change in internal energy when Water vapour at 100^(@)C to 120^(@)C ?
Answer» `666 J` `2998 J` `499.72 J` `166.28 J` SOLUTION :N//A

27.	Phase transitions are ubiquitous in nature. We are all familiar with the different phase of water (vapour, liquid and ice) and with the change from one to another, the change of phase are called phase transitions. There are six ways a substance can change between these three phase, melting, freezing, evaporating, condensing sublimation and decomposition. At 1 atm pressure vaporisation of 1 mole of water from liquid (75^(@)C) to vapour (120^(@)C). C_(v)(H_(2)O,l)=75 J "mole"^(-1)K^(-1), C_(p)(H_(2)O,g)=33.3J"mole"^(-1)K^(_1) Delta H_(vap) at 100^(@)C=40.7KJ//"mole" Calculate change in internal energy when Water liquid at 100^(@)C to vapour at 100^(@)C ?
Answer» `40700 J` `37598.878 J` `43801.1J` `31012.J` SOLUTION :N//A

28.	Phase transitions are ubiquitous in nature. We are all familiar with the different phase of water (vapour, liquid and ice) and with the change from one to another, the change of phase are called phase transitions. There are six ways a substance can change between these three phase, melting, freezing, evaporating, condensing sublimation and decomposition. At 1 atm pressure vaporisation of 1 mole of water from liquid (75^(@)C) to vapour (120^(@)C). C_(v)(H_(2)O,l)=75 J "mole"^(-1)K^(-1), C_(p)(H_(2)O,g)=33.3J"mole"^(-1)K^(_1) Delta H_(vap) at 100^(@)C=40.7KJ//"mole" Calculate change in internal energy when Water liquid at 75^(@)C to 100^(@)C ?
Answer» `1875 J` `13125 J` `-1875 J` `-13125 J` SOLUTION :N//A

29.	PHBV is
Answer» polyester POLYMER polyamide polymer polymer of GLYCOLIC ACID polymer of glycolic acid Answer :A

30.	PH_(4)I +KOH to underset(("gas"))(A) +underset(("salt"))(B) +H_(2)O Incorrect statement :-
Answer» .A. is INFLAMMABLE gas .B. is SALT of (SB + SA) .A. follows Drago.s rule A. is a weaker lewis BASE than `NH_(3)` Answer :A

31.	Pharmaceutical products are highly effective in which of the following form ?
Answer» EMULSION Gel Sol All of above SOLUTION :Emulsion

32.	PH_4I + NaOH forms
Answer» `PH_3` `NH_3` `P_4O_6` `P_4O_10` ANSWER :A

33.	[(Ph_3P)_3RhCl]is a familiar catalyst used in
Answer» HYDROGENATION of oils hydrogenation of alkenes dehydration of alcohols dehydration of aldehydes Answer :B

34.	(Ph_3P)_3RhCl is
Answer» ZIEGLAR nutta catalyst Wilkinsons catalyst Developer in photography Bio catalyst Answer :B

35.	[(Ph_(3)P)_(3)RhCI], a rhodium complex is used for the hydrogenation of alkenes.
Answer» ANSWER :1

36.	PH_3 produces smoky rings when it comes in contact with air this is because:
Answer» It is inflammable It COMBINES with WATER vapours It combines with nitrogen It CONTAINS IMPURITY of `P_2H_4` Answer :D

37.	PH_3 has lower boiling point than NH_3. Why ?
Answer» SOLUTION :Unlike `NH_3, PH_3` molecules are not ASSOCIATED through HYDROGEN bonding in liquid STATE. That is why the BOILING point of `PH_3` is lower than `NH_3`.

38.	PH_3 forms bubbles when passed slowly in water but NH_3 dissolves. Explain why ?
Answer» Solution :`NH_3` forms hydrogen bonds with WATER because of high electronegativity of nitrogen hence it gets soluble in water. PHOSPHORUS, HOWEVER cannot form hydrogen bonds hence it forms BUBBLES in water.

39.	PH_3 forms bubbles when passed slowly in water but NH_3 dissolves. Explainwhy ?
Answer» Solution :` NH_3` forms HYDROGEN bonds with water. THEREFORE it is soluble in water but `PH_3` cannot FORM hydrogen BOND with water. Therefore it ESCAPES as gas.

40.	PH_3 can be obtained by heating
Answer» White phosphorus with not concentrated alkali Heating phosphinic acid `(H_3PO_2)` Heating phosphinic acid `(H_3PO_3)` Heating phosphinic acid `(H_3PO_4)` SOLUTION :a) `P_(4)+3NaOH+3H_(2)Oraarr3NaH_(2)PO_(2)+PH_(3)uarr` b) `2H_(3)PO_(2)overset(DELTA)rarr3H_(3)PO_(4)+PH_3` C) `4H_(3)PO_(3)overset(Delta)rarr3H_(3)PO_(4)+PH_3`

41.	PH_(3) can be obtained by :
Answer» heating hypophosphorus acid heating orthophosphorus acid reacting WHITE phosphorus with HOT CONC. NaOH all Solution :(c) `P_(4)+3NaOH + 3H_(2) rarr 3NaH_(2)PO_2 +PH_3` While heating oxyacids YIELDS oxides and water.

42.	pH values of HCl and NaOH solutions each of strength (N)/(100) will be respectively
Answer» 2 and 3 2 and 12 12 and 2 2 and 10 Solution :`(N)/(100) = 0.01 N HCL, [H^(+)] = 10^(-2) M , pH =2` `[OH] = 10^(-2) M` for NAOH `pH + pOH = 14, pH =14-2, pH = 12`.

43.	Ph_(2)CH-overset(O)overset("\|\|")C-OHoverset(1.SOCl_(2))underset(2.Et_(3)N,Delta)rarr
Answer» `PH - OVERSET(O)overset("\|\|")C-Ph` NONE of these Answer :A

44.	pH value of which one of the following is not equal to one
Answer» `0.1 M HNO_(3)` 0.05 M `H_(2)SO_(4)` `0.1 M CH_(3)COOH` `50 cm^(3)` of `0.4 M HCl + 50 cm^(3)` of .2 NaOH Solution :`PH = -log [H^(+)]` (a) value of pH `= 0.1 M HNO_(3) = -log[0.1] = 1` (b) Value of pH `= 0.05 H_(2)SO_(4) = -log [2 xx 0.05] = 1` (c) Value of pH `= 0.1 M CH_(3)COOH != 1` as it is a weak acid so, will not undergo complete ionization. (d) Milli-equivalent of acid `= 50 xx 0.4 = 20` Milli-equivalent of BASE `= 50 xx 0.2 = 10` Remaining acid `= 20 -10 = 10` milli-eq. `[H^(+)] = (10)/(50+50) = (10)/(100) = 0.1` `pH = -log[H^(+)] = 1`.

45.	pH value of which one of the following is NOT equal to one ?
Answer» `0.1" M HNO"_(3)` `0.05" M "H_(2)SO_(4)` `0.1" M "CH_(3)COOH` `50" cm"^(3)` of 0.4 M HCl + 50 `"cm"^(3)` of `0.2" M NAOH"` Solution :`pH=-log[H^(+)]` (a) VALUE of `pH=0.1" M HNO"_(3)=-log[0.1]=1` (b) Value of `pH=0.05H_(2)SO_(4)=-log[2xx0.05]=1` (c) Value of `pH=0.1"M "CH_(3)COOH!=1` as it is a weak acid so, will not undergo complete ionization. (d) Milli - equivalent of acid `=50xx0.4=20` Milli-equivalent of base `=50xx0.2=10` Remaining acid `=20-10=10` milli-eq. `[H^(+)]=(10)/(50+50)=(10)/(100)=0.1` `pH=-log[H^(+)]=1`.

46.	Ph-underset(O)underset(\|\|)(C)-NH_(2) overset(POCl_(3))to products is
Answer» Benzonitrile Benzamine Chloro benzene Aniline Answer :A

47.	Ph-undersetunderset(OH)(\|)oversetoverset(Me)(\|)C-undersetunderset(OH)(\|)oversetoverset(Me)(\|)C-Et overset(conc.H_2SO_4,Delta)toProducts How many number of different type of carbonylproducts (only structural isomers ) can be formed (major or minor ) in this reaction, (considering all types of possible migrations)
Answer» SOLUTION :`Ph-undersetunderset(OH)(\|)oversetoverset(Me)(\|)C-undersetunderset(OH)(\|)oversetoverset(Me)(\|)C-Et`

48.	Ph-undersetunderset(Me)(\|)oversetoverset(OH)(\|)C-undersetunderset(I)(\|)oversetoverset(Me)(\|)C-Phunderset(Delta)overset(AgNO_3)to? Major product is :
Answer» None Solution :

49.	Ph-underset(O)underset(\|\|)(C)-CH_(3)overset(NaOCl)(to)A+ "salt" A+CH_(3)-underset(O)underset(\|\|)(C)-CH_(3)toB 'B' is
Answer» `CH_(3)-underset(O)underset(\|\|)(C)-CH=underset(CH_(3))underset(\|)(C)-PH` `Ph-underset(O)underset(\|\|)(C)-CH=CH-underset(O)underset(\|\|)(C)-CH_(3)` `CH_(3)-underset(CL)underset(\|)overset(Cl)overset(\|)(C)-CH_(3)` Answer :C

50.	pH value of a solution, whose hydronium ion concentration is 6.2 xx 10^(-9) mol/l, is
Answer» 6.21 7.21 7.75 8.21 Solution :`[H_(3)O^(+)]` MEANS `[H^(+)] = 6.2 xx 10^(-9)` mol/l `PH = -log (6.2 xx 10^(-9)) = 8.21`.