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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.
| 18651. |
The work function for a metal is 4eV. To emit a photo electron of zero velocity from the surface of the metal, the wavelength of incident light should be: |
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Answer» 2700`OVERSET@A` |
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| 18653. |
What do you understand by osmotic pressure ? |
| Answer» Solution :Osmotic pressure is the excess pressure which MUST be applied from the solution side to PREVENT the spontaneous flow of SOLVENT molecules from lower to higher concentration , when both are separated by a SEMIPERMEABLE membrance . | |
| 18654. |
Which acid is formed when SiF_4 reacts with water. |
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Answer» `H_2SO_4` |
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| 18655. |
Which of the following reagents can form a hydrazone with alkanone? |
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Answer» `NH_(2)OH` |
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| 18656. |
Which of the following has highest solubility in water ? |
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Answer» n-Butyl ALCOHOL |
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| 18657. |
Which of the following compound reacts with NaHCO_(3) solution to give sodium salt and carbon dioxide ? |
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Answer» PHENOL `CH_(3)COOH + NaHCO_(3) to CH_(3) COONa + CO_(2) + H_(2) O`. Thus in this reaction acetic acid `(CH_(3)COOH)` reacts with `NaHCO_(3)` to GIVE sodium salt and carbon dioxide . |
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| 18658. |
Which of the following statements/s is/are wrong? |
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Answer» If the value of l=0, the electron DISTRIBUTION is spherical Hence a and C are the correct answer. |
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| 18659. |
Torr is unit of : |
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Answer» Temperature |
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| 18660. |
When copperpyritesis roastedin excessof air, a mixtureofCuO + FeO isformed. FeO is presentas impurity. This can beremovedas slagduringreduction ofCuO. The fluxadded to formslag is |
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Answer» ` SiO_2`, whichis an acidic FLUX |
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| 18661. |
Which of the following vitamin is Naphtha-quinone derivative ? |
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Answer» A |
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| 18662. |
Write the chemical reactions for purification of Zirconium by Van Arkel's process |
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Answer» Solution :Step 1: `UNDERSET(("Impure Zirconium"))(ZR)+underset(("IODINE"))(2I_(2))OVERSET("523K")tounderset(("Zirconium iodine"))(Zrl_(4))` Step2:`Zrl_(4)overset(1800K)tounderset("pure Zirconium")(Zr)+2I_(2)` |
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| 18663. |
The reducing agent used for preparing aniline from nitro benzene in the laboratory is |
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Answer» `LiAIH_(4)` |
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| 18664. |
Which is an amino acid: |
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Answer» Glycine |
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| 18665. |
The respiration of the Suspension of the respiration of the suspension of yeast cells was measured by observing the decrease in pressure of gas above the cell suspension. The apparatus show that the gas was confined to a constant volume, 16.0 ml and the entire pressure change was caused by uptake of oxygen by the cells. The pressure was measured in a manometer. the fluid of which had a density of 1.034 g//cm^(3). The entire apparatus was immersed in a thermostat at 37^(@)C in a 30 min observation period the fluid in the open side of the a manometer dropped 37 mm. Neglecting the solubility of oxygen in the yeast suspension compute the rate of oxygen consumption by the cells in mm^(3) of O_(2) (S.T.P.) per hour. |
| Answer» SOLUTION :`1.0xx10^(2) MM^(3)` | |
| 18666. |
Zeolites have shape slectivity depending on |
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Answer» Atomic STRUCTURE |
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| 18667. |
Which one among the following is Williamson's synthesis: |
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Answer»
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| 18668. |
Which of the following compounds shall not produce propane by reaction with HBr followed by elimination or direct only elimination reaction- |
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Answer» `H_(3)C-CH_(2)-CH_(2)Br` 
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| 18669. |
Which of the following properties among halogens decrease(s) from fluorine to iodine ? |
| Answer» Answer :D | |
| 18670. |
The structural unit of a crystal is called |
| Answer» Answer :D | |
| 18671. |
The single, double and triple bond lengths of carbon in carbon dioxide are respectively |
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Answer» 1.15, 1.22 and 1.10 Å |
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| 18672. |
What will be the correct order for the wavelengths of absorption in the visible region of the following : [Ni(NO_(2))_(6)]^(4-),[Ni(NH_(3))_(6)]^(2+),[Ni(H_(2)O)_(6)]^(2+) |
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Answer» SOLUTION :As metal ion is fixed,the increasing FIELD strengths (CFSE values) of the ligands from the spectrochemical series are in the order : `H_(2)OltNH_(3)ltNO_(2)^(-)` Thus, the energies ABSORBED for excitation will be in the order : `[Ni(H_(2)O)_(6)]^(2+)lt[Ni(NH_(3))_(6)]^(2+)lt[Ni(NO_(2))_(6)]^(4-)` As `E=(hc)/(lambda)`, the wavelength absorbed will be in the opposite order. |
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| 18673. |
What is bakelite? How is it prepared? Give its uses. |
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Answer» Solution : (i) Bakelite is a THERMO setting plastic. It is PREPARED from the monomers such as phenol and formaldehyde. The condensation polymerisation take place in the presence of acid or base catalyst. (ii) Phenol reacts with methanal to form ortho or para hydroxyl methyl phenols which on further REACTION with phenol gives linear polymer called novolac. Novolac on further healing with formaldehyde undergoes cross linkages to form bakelite.  `implies`Novolacis used in paints . `implies` Soft bakelitear used in making glue of BINDING laminated wooden planks and in varnishes . `implies`Hard bakelitesare used to preparecombs , pens . |
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| 18674. |
Whatare nucleicacids ? Mention theirtwo importantfunction . |
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Answer» They help insynthesis pf PROTEINS . They arealsoresponsible for THETRANSFER of geneticcharater from ONE generationto the nextgeneration . |
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| 18675. |
Which substance is fused with sodium carbonate in free excess of air to form sodium chromate ? |
| Answer» SOLUTION :`FeCr_(2)O_(4)` | |
| 18676. |
Three particles of a solute 'A' assoviate in benzene to form species (A)_(3). The degree of association of 'A' is found to be 0.92. Calculate the freezing point of benzene is 5.5^(@)C and its cryscopic constant is 5.12 Km^(-1). |
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Answer» Solution :`alpha=(i-1)/(1/n-1)or 0.92=(i-1)/(1/3-1)` (i-1)=0.92(-0.667)=(-0.61) i-1-(0.61)=0.39 `DeltaT_(f)=ixxK_(f)xxm=(0.93)xx(5.12 KM^(-1))xx(0.25m)` =0.5 K or `0.5^(@)C` Frezing POINT temperaturte of solution. `T_(f)=T_(f)^(@)-DeltaT_(f)=5.5^(@)C-0.5^(@)C` `=5.0^(@)C` |
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| 18677. |
Therateofthereaction,A + B + C to Pis given by, r = -(d[A])/(dt)=k[A]^(1//2)[B]^(1//2)[C]^(1//4). The order is |
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Answer» 1 |
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| 18678. |
Which of the following compound is expected to be coloured |
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Answer» `Ag_(2)SO_(4)` |
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| 18679. |
Write the name and draw the structure of each of the following complex compounds : [Pt(NH_(3))_(4)] [NiCl_(4)] |
Answer» SOLUTION :Names and STRUCTURES of the COMPLEX compounds are given below : 
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| 18680. |
Which of the following statements about DNA is not correct? |
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Answer» It has a DOUBLE HELIX structure. |
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| 18681. |
Whena certain metal was irradiated with a light of 8.1 xx 10^(16)Hz frequencythe photoelectron emitted had1.5 times thekinetic energy as did the photoelectrons emitted when the same metal was irradiated with light5.8 xx 10^(16) Hzfrequency if the same metal is irradiated with light of 3.846 nm wave length what will be the energy of the photoelectron emitted ? |
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Answer» `1.8 XX 10^(2)` eV |
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| 18683. |
The value of equilibrium constant for the reaction [N_2O_5 (g) |
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Answer» 0.4 |
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| 18684. |
What is called the study of metallurgy with change in temperature ? |
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Answer» PYROMETALLURGY |
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| 18685. |
Which alkali metal reacts directly with nitrogen to form nitride? |
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Answer» Li |
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| 18686. |
Which of the following molecule has two lone pairs and bond angle lt 109^(@)28. :- |
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Answer» `SF_(2)` |
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| 18687. |
(W) and (X) are optically active isomers of C_(6)H_(9)CI. (w) on treatment with 1 mol of H_(2) is converted to anoptically inactivecompound (y) but (x) gives an optically active compound (Z) under the same conditions. Give structure of (Y) and configurations of (W) ,(X) nad (Z) in Fischer projections. |
Answer» SOLUTION :
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| 18688. |
(x) C_(7)H_(12)underset(Me_(2)S)overset(O_(3))rarrP+Q Compound P responds to Tollen's test and iodoform test but O does not respond with both the reagents. Structure of compound (x) is : |
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Answer»
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| 18689. |
""_(Z)X^(M)+""_(2)He^(4)to""_(15)P^(30)+""_(0)n^(1). Then |
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Answer» Z=12, M=27 Z=15-2=13. M=31-4=27. `""_(13)X^(27)+""_(2)He^(4)to""_(15)P^(30)+""_(0)n^(1)`. |
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| 18690. |
Which of the following statements is correct regarding the reactivity of benzaldehyde and propanal ? |
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Answer» Benzaldehyde less REACTIVE in electrophilic ADDITION reactions than propanal |
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| 18691. |
Which of the following properties is not correct to both Be and Al ? |
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Answer» `Be` like `AL` does not dissolve in alkalies |
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| 18692. |
Which amongthefollowingis NOTadiamagneticsubstance? |
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Answer» WATER |
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| 18693. |
To find formula of compound composed of A & B which is given by A_(X)B(Y) ,it is strongly heated in oxygen as per reaction A_(X)B_(Y) + O_(2) toAO + oxide of B If 2.5 gm of A_(X)B_(Y) on oxidation gives 3 gm oxide of A, Find empirical formula of A_(X)B_(Y), [Atomic mass of A = 24 & B = 14 ] |
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Answer» |
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| 18694. |
Which of the following compounds will not undergo hydrolysis ? |
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Answer» `NF_(3)` |
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| 18695. |
When an aldehyde was heated with alkali, a part of it was converted into alcohol and a part of it into an acid. The aldehyde is: |
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Answer» An ALIPHATIC ALDEHYDE other than HCHO |
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| 18696. |
Which reaction do we use generally to prepare diphenyl from aryl halide ? |
| Answer» SOLUTION :FITTING REACTION | |
| 18697. |
What is not correct about a crown-ether ? |
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Answer» It ALLOWS inorganic compounds to dissovles in non- polar solvents |
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| 18698. |
Which of the following compounds will undergo Cannizzaro reaction ? |
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Answer» `CH_(3)CHO` |
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| 18699. |
Which of the following KF in the solution of HF :- |
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Answer» `1M H_(2)S` |
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