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.	Select the best reagent to carry out the followingtransformations
Answer» `{:("(I)","(II)","(III)"),("Acetylene",,),(NaNH_(2),H_(2)//Pd,OsO_(4)//NaHSO_(3)):}` `{:("(I)","(II)","(III)"),("Acetylene",,),(NaNH_(2),H_(2)//"Lindlar",BH_(3)//NaOH),(,"catalyst",H_(2)O_(2)):}` `{:("(I)","(II)","(III)"),("Acetylene",,),(NaNH_(2),Li//NH_(3),"Cold"KMnO_(4)//),(,,NaOH//H_(2)O):}` `{:("(I)","(II)","(III)"),("Acetylene",,),(NaNH_(2),H_(2)//"Lindlar",OsO_(4)//NaHSO_(3)),(,"catalyst",):}` Solution :

2.	Select the appropriate combination which gives glycol [undersetunderset(OH)(\|)CH_2-undersetunderset(OH)(\|)CH_2] as a product.
Answer» <P>(IV)(ii)(S) (II)(ii)(P) (III)(ii)(S) (I)(ii)(Q) SOLUTION :`2KMnO_4+3CH_2=CH_2+4HOHto2KOH+2MnO_2+[undersetunderset(OH)(\|)(3CH_2)-undersetunderset(OH)(\|)(CH_2)]`

3.	Select the amphoteric substance in the following:
Answer» `SO_(3)` `NaOH` `CO_(2)` `AL(OH)_(3)` Answer :D

4.	Select the basic dye from the following
Answer» METHYL red Congo red Malachite green Methyl orange Solution :Basic DYES are the hydrochlorides or ZINC chloride salts of colour bases having basic groups. These dyes react with anionic SITES present on the fabric to attach themselves. For EXAMPLE : malachite green.

5.	Select the ambident nucleophile from the following: (i) C bar(N) "" (ii)- CH_3 barO "" (iii) CNbarS (iv) overset(* * )(NH_3) "" (V ) overset(* * )(PH_3) "" (vi )NO_(2)^(-)
Answer» SOLUTION :`C BARN, NO_(2)^(-) , CNS^(-)`

6.	Select that pairs in which bond angle of first member is higher than second one.
Answer» `BrO_3^(-), CrO_3^(-)` `Asl_3, Sbl_3` `SbBr_3, SbI_3` `NF_3, NH_3` Solution :(A)The BOND ANGLE decreases with decrease in electronegativies and increase in size of central atom. Hence the CORRECT ORDER of O-X-O bond angle is `CiO_3^(-) gt BrO_3^(-)` `{:(,CIO_3^(-),107^(@),BrO_3^(-),104^@),((B),AsI_3,100.2^@ ,Sbl_3,90^@),(( C),SbBr_3,98.2^@,Sbl_3,99^@),((D),NH_3 , 106.6^@ ,NF_3,102.2^@):}`

7.	Select th correctstatements among the following
Answer» METHANEIS presentin theatmoshere ofjupiter in Fischer -Tropschprocess ,alkaneissynthsised LIQUEFACTION of coal Methaneon PYROLYSIS givecarbonblack pyroductsobtainedin thereaction, ANSWER :A,B,C

8.	Select similarity between : [Co(NH_(3))_(4)(H_(2)O)Cl]Cl_(2)" and "[Co(NH_(3))_(4)Cl_(2)]Cl.H_(2)O
Answer» Oxidation NUMBER and coordination number of metal `Cl^(-)" and "H_(2)O` are the ligands Amount of precipitate with `AgNO_(3)` solution (by EQUIMOLAR 1 litre solution both) Number of Co-N linkages Solution :`[Co(NH_(3))_(4)Cl_(2)]Cl.H_(2)O` does not have `H_(2)O` as ligand.

9.	Select schemes A, B, C out of : I acid catalysed hydration II HBO III oxymercuration-demercuration
Answer» I in all cases I, II, III II, III, I III, I, II Solution :N//A

10.	Select right statement(s) about electrolysis :
Answer» Electric CURRENT is used to DRIVE a non - SPONTANEOUS reaction `DeltaG` is positive for chemical process during ELECTROLYSIS Cations and anions move towards the anode and cathode respectively. Over voltage is genarally associated with evolution of `O_2` gas. Solution :a) Electric current is used to drive non spontaneous proces b) `Delta G = +ve` for chemical process during electrolysis C) at over voltage ` O_2` gas evolved

11.	Select reagent which is/are used in laboratoryto differentiate 1^(@), 2^(@)" and " 3^(@)amines from each other :
Answer» `NeNO_(2)HCl` `PhSO_(2)Cl` `CHCl_(3),KOH` `CS_(2),HgCl_(2)` SOLUTION :(a) `1^(@)underset(HCl)OVERSET(NaNO_(2))rarrR-OHoverset(C.A.N)rarr` (Red colour) `2^(@)underset(HCl)overset(NaNO_(2))rarrR-N-N=O`(Oily liquid) `3^(@)underset(HCl)overset(NaNO_(2))rarr`Salt (b) Hinsberg's test can distinguish `1^(@),2^(@)" and "3^(@)` amines. (c ) Carbhylamine test is given by only `1^(@)` amines. (d) Mustard oil REACTION is also given by `1^(@)` amines only.

12.	Select reaction(s) with incorrect major product:
Answer» SOLUTION :

13.	Select reaction(s) incorrectly matched with major product:
Answer» SOLUTION :

14.	Select reaction with incorrect major product :
Answer» Solution :(b) TRAN DIOL can't GIVE PERIODIC cleavage. (c ) `SOCl_(2)+Py" gives "S_(N)2` reaction. (d) OH can'tgive the reaction with out TsCl.

15.	Select reaction with correct major product.
Answer» ANSWER :A

16.	Select reaction with correct major product.
Answer» ANSWER :C

17.	Select polybasic Arrhenius acids form the following :H_(3)PO_(2),H_(3)PO_(3),H_(3)BO_(3),HCOOH,(COOH)_(2) b Write conjugate acids of SO_(4)^(2-),RNH_(2),NH_(2)^(-),C_(2)H_(5)OC_(2)H_(5),F^(-) c Write conjugate base of HNO_(2),OH^(-),H_(2)CO_(3),HClO_(4) d Write conjugate acid and conjugate base of following amphoteric species: HS^(-),NH_(3).C_(2)H_(5)OH,H_(2)O e Classify the following into Lewis base :H^(+),FeCl_(3),(CH_(3))_(3)N,F,CH_(2)
Answer» Solution :Polybasic Arrhenius acids PRODUCE more than one `H^(+)` ion per acid MOLECULE when dissolved in WATER .On removel of one `H^(+)` from an acid ,we get its CONJUGATE base,On addition of one `H^(+)` to a base we get its conjugate acid .

18.	Select reaction with correct major product :
Answer» SOLUTION :N//A

19.	Select reaction with correct majoe product :
Answer» SOLUTION :N//A

20.	Select reaction correctly matched with major product :
Answer» `M-overset(O)overset(\|\|)C-OEt overset(DiBAL-H)toMeCH_(2)OH` `M-overset(O)overset(\|\|)C-CL overset(DiBAL-H)toMe-overset(O)overset(\|\|)C-H` `M-overset(O)overset(\|\|)C-Oh underset(Cl_(2))overset(RED P("limited"))toMe-overset(O)overset(\|\|)C-Cl` Solution :(a) `Me-overset(O)overset(\|\|)C-H+MeCH_(2)OH` are formed.(c ) is formed which forms hemi-acetal. (d) `Cl-CH_(2)-overset(O)overset(\|\|)C-OH` is formed by HVZ REACTION.

21.	Select option having fiberan polymer .
Answer» Ny-6 Oecron Neoprene Teflon Solution :N//A

22.	Select option having correctly matched polymer :
Answer» Terelyene`RARR`cloth Teflon`rarr`non-stich COATING BAKELITE` rarr` ELECTRIC switches Orlon` rarr`SYNTHETIC rubber Solution :N//A

23.	Select of the ether among following that yields methanol as one of the products on reaction with cold hydroiodic acid
Answer» 1-methoxy butane 1-methoxy butane-2-methyl propane 2-methoxy-2-methyl propane methoxy benzene Solution :

24.	Select incorrectly matched (1)One has different nautre of oxide than other two -Zn,Al B (2) One is not extracted by carbon reduction but other two are -Sn, Ag. Zn(from their name ore) (3) One has different magnetic nautre than other two -O_(2), Hg[Co(SCN)_(4)],[NiCl_(4)]^(2-) (4) One has different hydridised central atom than other two -MgO_(4)^(-),CrO_(4)^(-),ClO_(4)^(-)
Answer» One has DIFFERENT natuer of OXIDE than other two -Zn, Al B One is not EXTRACTED by carbon reduction but other two are -SN, Ag. Zn(from their ore) I, II and III I, II and IV Answer :C

25.	Select isoelectronic and isostructural pair:
Answer» `CO_(2),CN_(2)^(2-)` `[Cr(CO)_(6)]^(0),[FE(CN)_(6)]^(4-)` `NO_(2)^(-),O_(3)` All of the above Answer :D

26.	Select incorrect statments about N_2O_4
Answer» It self ionises as `NO^(+),NO_(3)^(-)` Subtance containing `NO^+` is said to be acid and that containing `NO_3^(-)`is said to be base It is PARA MAGNETIC It is dimer of `NO_2` Solution :`N_2O_4` is a dimer of `NO_2`. DIAMAGNETIC it exists as `NO^(+) and NO_3^(Theta)`

27.	Select incorrect statements.
Answer» Methoxy ethane give IODOETHANE with one EQUIVALENT anhydrous HI Order of basicity in aqueous medium `MeNH_(2)ltMe_(2)NHltMe_(3)N` Optically active alkanol will show TOTAL retaintion of configuration during its reaction with `SOCl_(2)` S-2-bromobutane gives R-2-methyl butane nitrile with AgCN as MAJOR product Answer :A::B::D

28.	Select incorrect statement(s).
Answer» Phenolphthalein is SUITABLE indicator for the titraction of HCl(aq) with `NH_4OH (aq). ` An acid-base indicator in a buffer solution of `pH= pK_(LN)+ 1` is ionized to the extent of 90% In the titration of a monoacidic WEAK base with a strong acid, the pH at equivalent point is always calculated by `pH= 1/2 [pK_w - pK_b - logC] ` When `Na_3PO_4(aq)` is titrated with HCl (aq.), the pH of solution at second equivalent point is calculated by `1/2 [pK_(a_(1)) + pK_(a_(2))]` Answer :A::B::C

29.	Select incorrect statement (s)
Answer» `NI^(2+)` compounds TENDS to be thermodynamically more STABLE thean `PT ^(2+)` `PT^(4+)` compounds are RELATIVELY more stable than `Ni^(4+)` compounds `K_(2)PtCl_(6)` exist `K_(2)NiCl_(6)` exist ANSWER :D

30.	Select incorrect statement for [Cr (en)_(3)]^(3+) and [Cr("gly")_(5)] complexes.
Answer» Both show stereo isomerism Both has same crystal field stablization energy Both are inner ORBITAL complex Both has equal magnetic moment Solution :Expression of CFSE is same, but do not have equal value of CFSE DUE to DIFFERENCE in splitting energy.

31.	Select incorrect statement about the complex : cis-[Rh(H)(CO)(Pme_(3))_(2)]
Answer» It is a chiral complex It is a polar complex Its trans FORM is chiral Its trans form in non-polar Solution : `mu NE 0`, complex is ACHIRAL, even in it's trans form.

32.	Select incorrect statement about complex [Cr(NO_(2))(NH_(3))_(5)][Zn(SCN)_(4)]:
Answer» It shows co-ordination isomersm it shows OPTICAL ACTIVITY It shows LINKAGE isomerism IUPAC name of the COMPOUND is pentaaminenitrito-N-chromium(III) tetrathiocyanato-S-zincate(II) SOLUTION :Complex `[Cr(NO_(2))(NH_(3))_(4)][Zn(SCN)_(4)]` can not shows optical activity

33.	Select incorrect statement about lanthanides.
Answer» All the LANTHANIDES are non-radioactive (EXCEPT `P_m` ) All the lanthanides have `6s^2` configuration in OUTERMOST shell Most stable OXIDATION number is +3 Lanthanum has `[Xe]4f^1 6s^2` configuration Answer :D

34.	Select incorrect statement about followingreaction of ether synthesis : R-X + R' O Na to ROR' + NaX
Answer» It follows `S_N` 2 mechanism Alkyl HALIDE (RX) should be `2^@` or `3^@` while alkoxide (`RO^(-)NA^+`) should be `1^@` Alkyl halide should be `1^@` while alkoxide should be `2^@` or `3^@`. `2^@` and `3^@` alkyl halide may undergo `E_2` elimination in the presence of a strong BASE to form alkenes. Answer :B

35.	Select incorrect statement about hydroboration-oxidation :
Answer» Addition is against MARKOWNIKOFF rule Intermediate is a CARBOCATION It does not INVOLVE rearrangement It is a addition reaction Answer :B

36.	Select incorrect statement about alanine.
Answer» it is OPTICALLY active It is a `1^(@)`AMINO acid It GIVES purple colour with ninhydrin. Itis one of the 20 standard amino acid. Solution :N//A

37.	Which colour emission is radiatedby potassium when excited electrons come back to ground state :-
Answer» CRIMSON red Red violet Blue Violet Answer :D

38.	Half life of long -lived isotopes Francium is :-
Answer» 21 minutes 18 minutes 23 minutes 11 minutes Answer :A

39.	Select incorrect statement.
Answer» SILICA present in bauxite is removed by addition of NaOH(aq) Silica present in concentrated HAEMATITE is removed by the addition of `CaCO_(3)` during smelting `Fe_(2)O_(3)` present in bauxite is removed by Baeyer's process Magnetic SEPERATION is ADOPTED for cassiterite because it contains magnetic impurity Answer :1

40.	Select incorrect statement:
Answer» STABILITY of peroxides and superoxides of alkali metals increase in SIZE of the METAL ion NaOH does not form hydrated salt Increase in stability in (a) is due to stabilisation of large anoin by LARGER cations through LATTICE energy effects The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy Answer :D

41.	Select incorrect sequence of solubility product values among the following
Answer» `CoS gt CuS` `NiS gt PBS` `Fe(OH)_(3) gt Fe(OH)_(2)` `NI(OH)_(2) gt Cr(OH)_(3)` Answer :C

42.	Select incorrect statement :-
Answer» `O_3 and O_(2)^(2-)` both are diamagnetic Out of `O_2, O_(2+), O_3" least O–O BOND LENGTH is in " O_(2)^(+)` Out of `O_2, O_(2+), O_(2-)" only "O_2` is paramagnetic Out of `O_(2), O_(2+), O_(2-)`, maximum SPIN magnetic moment is of `O_(2 )` ANSWER :C

43.	Select incorrect statement :
Answer» Higher the value of `k_H` (Henry’s LAW constant) at a GIVEN pressure, the lower is the SOLUBILITY of the gas in the liquid Solubility of a gas in a liquid decreases with INCREASES in temperature and pressure to minimise the painful effects accompanying the decompression of deep sea divers, `O_2` DILUTED with less soluble He gas is used as breathing gas The solubility of a gas in a liquid is governed by Henry’s law Answer :A::B

44.	Select incorrect reduction process in respective extraction of an element :
Answer» `8 Al + 3Mn_(3) O_(4) OVERSET(Delta)to 4Al_(2)O_(3) + 9Mn` `2ZnS + C overset(Delta)to 2Zn + CS_(2)` `FeO + C overset(Delta)to Fe + CO` `2[Ag(CN)_(2)]^(-) + Zn to [Zn(CN)_(4)]^(2-) + 2Ag` SOLUTION :ZnS first roasted i.e. BURNT to form ZnO

45.	Select incorrect reduction process :
Answer» `2[Ag(CN)_(2)]^(-) + Zn rarr [Zn(CN)_(4)]^(2-) + 2Ag` `2FeO + C OVERSET(Delta)rarr FE + CO` `8 AI + 3Mn_(3)O_(4) overset(Delta)rarr 4 Al_(2)O_(3) + 9 Mn` `2ZnS + C overset(Delta)rarr 2ZnS + CS_(2)` Answer :D

46.	Select incorrect reduction process
Answer» `2[AG(CN)_(2)]^(-) + Zn rarr [Zn(CN)_(4)]^(2-) + 2AG` `CuO + H_(2) rarr Cu + H_(2)O` `ZnO + H_(2) rarr Zn + H_(2)O` `MgO + C rarr Mg + CO` Answer :C

47.	Select incorrect order
Answer» `H_2OgtH_2SgtH_2SegtH_2T_2` (order of bond angle) `HF gt HCl gtHBr GTHI` (order of boiling character) `Li LT BeCl_2 lt BCl_3 lt"CCL"_4` (order of covalent character) `CaF_2 gtVaCl_2 gtCaBr_2 gtCaI_2` (order of MELTING point ) Answer :B

48.	Select incorrect opyions about polymerane :
Answer» It is also called as styrofoam. It is an insulator. It is used as packing material. It is CAPABLE of showing GEOMETRICAL isomerism. Solution :N//A

49.	Select incorrect match for [M(H_(2)O)_(6)]^(2+) complex.
Answer» ANSWER :3

50.	Select incorrect option:
Answer» `CH_(4) + "AIR" overset(Red hot)underset(Fe tube) (to) CH_(3)OH` `CH_(4)+"air"overset(MoO_(3))underset(Delta)(to) HCHO` `CH_(3)CH_(2)CH_(3)+"air" overset(MN(OAc)_(2))underset(Delta)(to) CH_(3)CH_(2)COOH` `Me-underset(Me)underset(\|)CH-Me overset(KMnO_(4))(to) Me-overset(O)overset(\|\|)C-Me` SOLUTION :`Me_(3)C-OH` is formed.