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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.
| 10351. |
Which of the following alkanes cannot be prepared by the Wurtz reaction in good yield ? (i) (CH_3)_2CHCH_2(CH_3)_2 |
| Answer» SOLUTION :(i),(III) and (iv) are three unsymmertical alkanes. So, these cannot be prepared by WURTZ REACTION in good YIELD. | |
| 10352. |
Under standard conditions for all concentrations, the following reaction is spontaneous at 25^@C .O_2(g) + 4H^(+)(aq) + 4Br^(-)(aq) = 2H_2O (l) + 2Br_2(l)If [H^+]is decreased so that the pH = 3.6, what value will E_("cell")have, and will the reaction be spontaneous at this [H^+] ? |
| Answer» SOLUTION :`-0.05 V, No` | |
| 10353. |
What are homopolymers ? Give example. |
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Answer» SOLUTION :condensation POLYMER : The polymer which is formed by the condensation polymer. E.g. Nylon 6,6 poly ETHYLENE TEREPHTHALATE. |
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| 10354. |
Which of the following is unsymmetrical alkene? |
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Answer» 1-butene |
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| 10355. |
Which one of the following is a mixted anhydride? |
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Answer» NO |
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| 10356. |
Under standard conditions for all concentrations, the following reaction is spontaneous at 25^@C.O_2(g) + 4H^(+)(aq) + 4Br^(-) (aq) to 2H_2O (l) + 2Br_2(l) , E^@ = 0.17V If [H^+]is adjusted by adding a buffer of 0.10 M NaOCN and 0.10 M HOCN (K_a = 3.5 xx 10^(-4)), what value will E_("cell")have, and will the reaction be spontaneous at this [H^+] ? |
| Answer» SOLUTION :-0.042 V, No | |
| 10357. |
The values of the rate constant of the reaction C_(2)H_(5)I+OH^(-)toC_(2)H_(5)OH+I^(-) at 30^(@) and 60^(@)C temperatures are 0.325 and 6.735 litre "mole"^(-1) "second"^(-1) than what will be the value of activation energy? |
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Answer» 20260 cal `therefore (LOG 6.735)/(0.325)=(E_(a))/(2.303)xx1.987((1)/(303)-(1)/(333))` `therefore E_(a)`=20260 cal |
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| 10358. |
Which of the following polymers exist in geometrical isomeric forms? |
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Answer» Polypropylene |
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| 10359. |
Which of the following halogen oxides is ionic? |
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Answer» `ClO_(3)` |
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| 10360. |
Write the name and structure of the monomer units of terylene or dacron. |
| Answer» SOLUTION :ETHYLENE GLYCOL and terephthalic acidor its METHYL ESTER. | |
| 10361. |
What type of stoichiometric defect is shown by : (i) Zns(ii) AgBr |
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Answer» Solution :(i) ZNS shows Frenkel DEFECT. ZN is much LARGER in size than S. (ii) AgBr shows both Frenkel and Schottky defects. |
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| 10362. |
Which of the following reactions of glucose can be explained by the cyclic structure ? |
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Answer» GLUCOSE forms pentaacetate The pentaacetate of glucose does not have free aldehydic group at C1 position which is explained by its cyclic structure of glucose.? |
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| 10363. |
Which of following is most easily cleaved by HBr. |
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Answer»
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| 10364. |
What happens when acetone reacts with: Hydroxyl amine |
Answer» SOLUTION :
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| 10365. |
Write two uses of flourine. |
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Answer» SOLUTION :As FIRE EXTINGUISHER in AEROPLANE Feron-22 as REFRIGERANT |
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| 10366. |
Which of the following is/are not correct regarding graphite? |
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Answer» Graphite is anisotropic. |
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| 10367. |
The solubility product of HgCl_(2) at room temperature is 4.0 xx 10^(-5) . The concentration of Cl^(-) ion in the saturated solution will be |
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Answer» `9 XX 10^(-15)` |
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| 10368. |
Which of the following types of octahedral complexes can show mer-fac isomerism ? where M is central metal, A, B and c are different monodentate ligands while AA is a symmetrical bidentate ligand. |
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Answer» `MA_(4)B_(2)` or `MA_(2)B_(4)`  Note that two of the A ligands occupy positions just opposite one ANOTHER. The four ligands have a SQUARE planar arrangement in which cis-trans isomers arepossible. Two diastereoisomers are also possible for an octachedral complex of the type `M(A A)_(2)B_(2)` or `M(A A)_(2)BC` as illustrated in Q.2. Octahedral complexes with the general formula `MA_(3)B_(3)` exhibit mer-fac isomerism. If we first draw an A ligand and a B ligand opposite one another in an octahedral geometry. Then the other ligands can have cis or trans arrangements on the plane perpendicular toi the axis of the first A and B ligands:  Isomer (I) show above has the three A ligands in adjacent positions (`90^(@)` separation) on one triangular face of the octahedron (fac-isomer), isomer (II) has all three A ligands in a plane that contains the M (mer-isomer). In isomer (I), all three B-M-B bonds angles are `90^(@)` whereas in isomer (II) two B-M-B angles are `90^(@)` and the third is `180^(@)`. To CONVINCE ourselves that only two diasterosiomers of `MA_(3)B_(3)` exist, look back at the cis-and trans- `[MA_(4)B_(2)]` and consoider the products obtained form them when one of the four A ligands in cis-isomer is REPLACED by a B. There are two kinds of A-ligands in the cis-isomer: two A ligands that are trans to each other and two A ligands that are trans to a B ligands. Replacing an A trans to another A with B gives `[MA_(3)B_(3)]` isomer (I), whereas replacing an A trans to a B with another B gives isomer (II)  All four A ligands in trans - `[MA_(4)B_(2)]` are equivalent, and replacing any one of them with a B gives isomer (II).  If we rotate the resulting `[MA_(3)B_(3)]` complex, we can see that it is identical to the previous DRAWING of isomer (II). Thus, there are only two diasteroisomers for a complex of the type `[MA_(3)B_(3)]` . Octahedral complexes of the type `[MA_(6)]` or `[MA_(5)B]` would not show geometrical isomerism. |
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| 10369. |
The time taken for 90% of a first order reaction to complete is approximately |
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Answer» 1.1 times that of half life `= (2.303)/(k) "log" 10 = (2.303)/(k)` `t_(1//2)= (2.303)/(k) "log" (a)/(a-0.5a)` `= (2.303)/(k ) "log" 2` `t_(1//2) = (2.303xx0.3010)/(k) ` `:. (T_(90%))/(t_(1//2))= (1)/(0.3010) 3.3` `:. t_(90%) = 3.3t_(1//2) ` |
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| 10370. |
Which of the following molecules is expected to be the most ionic ? |
| Answer» Answer :C | |
| 10371. |
Which compound is soluble in H_(2)O |
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Answer» `HCHO` |
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| 10372. |
When a burning Mg-ribbon is introduced into a jar of colourless gas 'A', the product 'B' is the obtained . 'B' on boiling with water gives a gas 'C' with pungent odour. When 'C' gas is paused over heated cupric oxide, again the gas 'A' is obtained. Identify C. |
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Answer» `N_(2)` `A = N_2 gas , B = Mg_3 N_2 , C = NH_3` `3Mg + underset((A))(N_2) overset(DELTA)(rarr) underset((B))(Mg_3N_2)` `Mg_3N_2 + 6H_2O overset(Delta)(rarr)3Mg(OH)_(2) + 2NH_(3) uarr` `2NH_3 + 3Cu O overset(Delta)(rarr)3Cu + 3H_2O+ underset((A))(N_2) uarr`. |
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| 10373. |
Whichof thefollowingyieldsbothalkaneandalkene ? |
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Answer» Kolbe'sreaction |
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| 10374. |
Which nucleic acid is responsible for carrying out protein synthesis in the cell ? |
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Answer» |
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| 10375. |
Which of the following complexes has lower Delta_(0) (spliting energy) than pairing energy :- |
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Answer» `[RhF_(6)]^(-3)` |
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| 10376. |
Which of the following is the hardest compound of boron? |
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Answer» BORON oxide |
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| 10377. |
To whichof the following ores, calcination process in not applicable |
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Answer» `CaCO_3 ` |
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| 10379. |
What will be the number of moles of K_(2)SO_(4) tobe dissolved in 12 mol of water to lower . Its vapour pressure by 10 mm Hg at a temperature at which vapourspressure of pure water is 50 mm . |
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Answer» |
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| 10380. |
Which of the following is correct with respect to -I effect of the substituents (R = alkyl) |
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Answer» `-NH_(2) LT -OR lt -F` Also `-NR_(2) lt -OR lt -F "" -I` effect |
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| 10381. |
What is a nucleotide ? |
| Answer» Solution :A nucleoside consists of ALLL the three BASIC components of nucleic acids, i.e., a nitrogenous base (purine or pyrimidine) , a five CARBON sugar (ribose or deoxyribose) and phosphoric ACID. A nucleoside is obtained when the nitrogenous base is attached to `C_1` of the sugar by a `beta` - linkage and a NUCLEOTIDE is obtained when `C_5'-OH` of the sugar is esterified with phosphoric acid. Thus , in general , nucleotides may be represented as. | |
| 10382. |
What type of bonding occurs in B-pleated structure of proteins? |
| Answer» Solution :PEPTIDE chains are HELD together by a LARGE NUMBER of intermolecular hydrogen bonds between `-overset(O)overset(||)(C) -`and- NH group of peptide chains. | |
| 10383. |
Write the relavant chemical equations : n-propyl bromide to isopropyl bromide |
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Answer» Solution :`CH_3-CH_2-CH_2-BR OVERSET(ALC. KOH)(RARR)` `CH_3-CH=Br overset(HBr)(rarr) CH_3-overset(Br)overset(|)(CH)-CH_3`. |
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| 10384. |
Under what conditions, 2-methylpropene can be converted into isobutyl bromide by hydrogen bromide? |
| Answer» Solution :In presence of peroxides, anti-Markovnikov's addition of HBr to 2-methylpropene gives isobutyl BROMIDE. <BR> `underset("2-Methylpropene")(CH_(3)-OVERSET(CH_(3))overset(|)(C)=CH_(2))+HB r underset(("Anti-Mark addition"))overset(RCOOR)to underset("Isobutyl bromide")(CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)Br)` | |
| 10385. |
The solid waste of polymers causes acute ________problems and remain ungraded for quite a long time. |
| Answer» SOLUTION : ENVIRONMENTAL | |
| 10386. |
Which is least soluble in water |
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Answer» `CaSO_(4)` |
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| 10387. |
The salt Zn(OH)_(2) is involved in the following two equilibria, Zn(OH)_(2)(s) hArr Zn^(+2) (aq) + 2OH^(-) (aq), K_(sp) Zn(OH)_(2) = 1.2 xx 10^(-17) Zn ( OH)_(2)(s) + 2OH^(-) ( aq) hArr [Zn(OH)_(4)]^(2-)(aq), K_(c ) = 0.13 Calculate the pH at which the solubility of Zn(OH)_(2) be minimum. Also find the solubility at this concentration. |
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Answer» Solution :The solubility of `Zn(OH)_(2)` will be given as `s = [ Zn^(+2) ] + [ Zn(OH)_(4) ] ^(2-)= ( K_(sp))/([OH^(-) ] ^(2) ) + K_(c ) [ OH^(-) ] ^(2-)` The MINIMUM SOLUBILLITY will be obtained by setting `( ds )/( d[OH^(-) ] ) = 0` HENCE ` ( - 2K_(sp))/( [OH^(-) ] ^(3)) + 2K_(c ) [ OH^(-) ] = 0` `[OH^(-) ] = ((2K_(sp))/( 2K_(c )))^((1)/(4)) = ((1.2 xx 10^(-17))/(0.13))^(1//4) = 9.8 xx 10^(-5)` `PH = 14-4.01 = 9.99` `s = ( 1.2 xx 10^(-17))/(( 9.8 xx 10^(-5))^(2)) + ( 0.13 ) ( 9.8 xx 10^(-5))^(2) = 2.5 xx 10^(-9) M` |
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| 10388. |
Which of the two compounds is more stable and why ? K_(4)[Fe(CN)_(6)], K_(3)[Fe(CN)_(6)] |
| Answer» Solution :`K_(4)[FE(CN)_(6)]` is more STABLE than `K_(3)[Fe(CN)_(6)]`. See EFFECTIVE Atomic Number Rule (Sidgwick theory). | |
| 10389. |
Which one of the following statement is correct? |
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Answer» From a mixed precipitate of `AgCl` and `Agl`,ammonia solution dissolves only `AgCl` (2)`Fe^(3+)+[Fe(CN)_(6)]^(4-) to Fe_(4)[Fe(CN)_(6)]_(3)` (prussian blue colouration or ppt.) (3)`2KMCO_(3)OVERSET(Delta)toK_(2)CO_(3)+H_(2)O +CO_(2),Ca(HCO_(3))_(2) overset (Delta) to CaCO_(3)+H_(2)O +CO_(2)` (4)In reducing flame the bead is colourless.It is violet in oxidising flame. |
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| 10390. |
Which of the following statements regarding thiosulphate ion is/are correct? |
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Answer» Shape of thiosulphate ION is TETRAHEDRAL |
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| 10391. |
Which of the following organic compounds are formed by Wurtz reaction ? |
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Answer» Alcohols |
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| 10392. |
Which of the following statements is wrong regarding Lanthanoids? |
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Answer» Ln(III) compounds are predominantly ionic in character. |
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| 10393. |
Which is the use of ethanol ? |
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Answer» In colour INDUSTRY as a SOLVENT |
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| 10394. |
Which one of the following is not resonance form of the enolate ion formed aceto acidic ester? |
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Answer»
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| 10395. |
Which of the following series contains electrophiles only ? |
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Answer» `H_(2)O,BF_(3),NO_(2)^(+)` |
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| 10396. |
What happens when sulphur dioxide is passed into aqueous solution of Fe (III) salt ? |
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Answer» Solution :Fe (III) salt is reduced to Fe (II) salt . `2FE^(3+) + SO_2+ 2H_2O to 2Fe^(2+) + SO_(4)^(2-) + 4H^(+)` |
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| 10397. |
The tendency of 3d-metal ions to form stable complexes is due to their |
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Answer» VARIABLE OXIDATION state |
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| 10398. |
Tin dissolves in dilute HNO_3 forming: |
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Answer» Metastannic acid |
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| 10399. |
When intial concentration of the reactant is doubled ,the half-life period of a zero order reation……… |
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Answer» remains uncharged `t_((1)/(2))=K[R]_(0)` If concentration is doubled . `t_((1)/(2))(2)=K2[R]_(0)` `therefore (t_((1)/(2))(2))/(t_((1)/(2)))=(K2[R]_(o))/(K[R]_(o))=2` If concentration the reactant is double in a zero order reaction its half life TIME is doubled. |
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| 10400. |
Which one of the following will show optical isomerism? |
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Answer» `CH_(2)OH-COOH` |
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