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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.
| 19351. |
Which is a natural colloid ? |
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Answer» SODIUM chloride |
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| 19353. |
Which one of the following is expected to exhibit optical isomerism ? (en = ethylenediamine) |
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Answer» `ul("cis")-[PT(NH_(3))_(2)Cl_(2)]` 
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| 19354. |
Which doesnot act as an acid in sulphuric acid |
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Answer» `HClO_(4)` |
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| 19355. |
Why are Mn^(2+) compounds more stable than Fe^(2+) towards oxidation to their +3 state ? |
| Answer» SOLUTION :Electronic configuration of `Mn^(2+)` is `3d^(5)` which is half-filled and hence stable. THEREFORE, third ionisation enthalpy is very high, i.e., third ELECTRON cannot be lost EASILY as it WOULD affect the stability of `3d^(5)` configuration. In case of `Fe^(2+)`, electronic configuration is `3d^(6)`. Hence, it can lose one electron easily to give the stable configuration `3d^(5)`. | |
| 19356. |
There is S-S bond in |
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Answer» `S_2O_(4)^(2-)` B). `S_(2)O_(5)^(2-) """"^(-)O-O-overset(O)overset(||)S-overset(O)overset(||)S-O^(-)` c). `S_(2)O_(6)^(2-) """"^(-)O-underset(O)underset(||)overset(O)overset(||)S-underset(O)underset(||)overset(O)overset(||)S-O^(-)` |
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| 19357. |
What type of ligand has two different donor atoms ? |
| Answer» SOLUTION :AMBIDENTATE | |
| 19358. |
Which of the following properties is/are common to both K_2Cr_2O_7 & KMnO_4 ? |
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Answer» Both on heating form an oxosalt, a metal oxide & oxygen gas. (B)Both have their colour (ORANGE and purple RESPECTIVELY) because of charge transfer spectrum (since no unpaired electrons). (C )Only `K_2Cr_2O_7` behaves as primary titrant, while `KMnO_4` behaves as secondary titrant. (D)Both form a slightly coloured precipitate (S) with hydrogen sulphide in acidic medium. |
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| 19360. |
What would happen if no sal bridge were used in an electrochemical cell (like Zn-Cu cell)? |
| Answer» Solution :The metal `(Zn^(2+))` formed by the LOSS of electrons will accumulate in one electrode and the negative IONS `(SO_(4)^(2-))` will accumulate in the other. THUS, the solutions will develop charges and the current stops FLOWING. Moreover, inner circuit is not completed. | |
| 19361. |
Why aluminium can be used as a reducing agent for the reduction of chronic oxide? |
| Answer» Solution :Ellingham diagram is used to predict THERMODYNAMIC FEASIBILITY of reduction of oxides of one metalby another metal.Any metal can reduce the oxides of other metals that AR located above it in the diagram .for example ,in the Ellingham diagram ,for the formation of chromium oxide lies above that of the aluminium,meaning that `Al_(2)O_(3)` is more stable than`Cr_(2)O_(3)`.Hence aluminium can be used as a reducing agent for the reduction of chromic oxide.However ,it cannot be used to redice the oxides of magnesium and calcium which occupy LOWER position than aluminium oxide. | |
| 19362. |
Which one of the following statement is not true regarding ether ? |
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Answer» These are LEWIS bases |
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| 19363. |
Which of the following compound, on reaction with NaOH and Na_(2)O_(2) gives yellow colour ? |
| Answer» Answer :A | |
| 19364. |
Which of the following will give a pair of enantiomorphs ? |
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Answer» `[CR(NH_(3))_(6)[CO(CN)_(6)]` |
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| 19365. |
What is the mass of hydrogen peroxide in 1 L of 3M solution |
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Answer» 10.2 g |
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| 19366. |
Which solution will produce maximum elevation in b.pt. ? |
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Answer» 0.1 M glucose |
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| 19367. |
What is the molecular. mass of most available natural fullerene? |
| Answer» SOLUTION :720, (`C_60` FULLERENE) | |
| 19368. |
Which one prevent coagulation of blood ? |
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Answer» ASPIRIN |
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| 19369. |
Under what condition is E_(cell)=0 or Delta_(r)G=0 ? |
| Answer» SOLUTION :* When chemical reaction achieves in EQUILIBRIUM reaction, then chemical reaction will stop and value of `E_(cell) and Delta_(r)G` become ZERO. | |
| 19370. |
What are the following substances ? Give one example of each one of them: (i) Tranquilizers, (ii) Food preservatives, (iii) Synthetic detergents. |
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Answer» Solution :(i) Tranquilizers : Tranquilizers are chemical compounds used for the treatment of stress and mild or even SEVERE mental diseases. e.g., equanil/meprobomate/veronal. (ii) Food preservatives : Food preservatives are the compounds which prevent spoilage of food due to microbial GROWTH. e.g., sodium benzoate, vinegar. (iii) Synthetic detergents are cleansing AGENTS which have all the properties of SOAP but actually do not contain any soap. e.g., Sodium lauryl SULPHATE. |
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| 19371. |
Whatof the followingdoes't undergoesacidhydrolysis ? |
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Answer» `CH_(3) - NHO_(2)` |
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| 19372. |
Tonics in general contain |
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Answer» ETHER |
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| 19373. |
Which of the following polymeris biodegradable ? |
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Answer» `(--CH_(2)-underset(Cl) underset(|)(C)=CH-CH_(2)--)_(n)` |
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| 19374. |
Zinc , cadmium and mercury are : |
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Answer» d-block ELEMENTS |
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| 19375. |
Which of the following reagents are not correctly matched with the reaction ? |
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Answer» `CH_(3)CH=CHCHO to CH_(3)CH=CHCOOH:" Ammoniacal "AgNO_(3)` |
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| 19376. |
What happens when NaCl is heated with H_(2)SO_(4) in the presence of MnO_(2) ? |
| Answer» SOLUTION :`4NaCl + MnO_(2) + 4H_(2)SO_(4) → MnCl_(2) + 4NaHSO_(4) + 2H_(2)O + Cl_(2)` | |
| 19377. |
Which of the structures is/are diastereomer of A |
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Answer» 3 |
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| 19378. |
Two 1 -litre flask A and B are connected to each other by a valve which is closed. Flask A has benzene in equilibrium with its vapours at 30^(@)C. The flask B, is evacuated, and the valve is opened. Which of the following is true. I f temperature is kept constant.' |
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Answer» Some of the benzene molecules WOULD MOVE to flask B from flask A. |
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| 19379. |
Valence bond theory was introduced by |
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Answer» Heitler and London |
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| 19380. |
The wave number of the shortest wavelength of absorption specturm of H-atom is (Rydberg constant =109700cm^(-1)) |
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Answer» `109700 CM^(-1)` `barv=109700cm^(-1)1/(1^(2))-1/(oo^(2))=109700cm^(-1)` |
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| 19381. |
Which of the following is obtained when aniline is treated with conc. HNO_(3) ? |
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Answer» o- and p- nitroaniline |
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| 19382. |
Trichloromethane or Chloroform (CHCl_(3)). |
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Answer» Solution :Chloroform in the production of chlorofluorometheane, freon refrigerant R-22. (2) It is used as solvent in PHARMACEUTICALS, pesticdes and DYE industry. (3) It is a good SOURCE of dichlorocarbene species. |
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| 19383. |
What is colloidion ? |
| Answer» SOLUTION :It is a 4% solution of nitrocellulose in a mixture of alcohol and ether. | |
| 19384. |
Which of the following alkyl halides has the lowest boiling point? |
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Answer» n-Butyl chloride. |
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| 19385. |
Thermite process is used to extract metals |
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Answer» When their oxides can't be REDUCED by carbon |
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| 19386. |
Which type of metals form effective catalysts ? |
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Answer» ALKALI metals |
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| 19387. |
Write tha name of the vitamin whose deficiency causes bone deformities in children. |
| Answer» SOLUTION :VITAMIN D. | |
| 19388. |
Which of the following anion cannot be in X? |
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Answer» `F^(-)`<BR>`CL^(-)` AgI does not dissolve in excess conc. `NH_(3)` solution. |
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| 19389. |
Which of the following statements is not true about the hexagonal close packing- |
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Answer» the coordination NUMBER is 12 |
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| 19390. |
Which of the following pairs of name and formula of complexes, is correct ? |
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Answer» Tetraamminecopper(II) sulphate ………………... `[Cu(NH_(3))_(4)]SO_(4)` |
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| 19391. |
Which of the following alcohols on oxidation give carboxylic acid with lasser number of carbon atoms? |
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Answer» `(CH_3)_3 - C - CH_2OH` |
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| 19392. |
The vitamin , whichplays a role in transportation , of amino acids across the cell membrane is |
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Answer» `B_1` |
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| 19393. |
Which of the following statements is regarding rusting/corrosion? |
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Answer» Iron rust faster in saline water than in pure water |
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| 19394. |
The terrorist attach which occurred in delhi high court on september 8,2011 used PETN as the deadly explosive. What does PETN stand for and how is it prepared? |
Answer» Solution :PETN stands for pentaerythritol tetranitrate. Repeated cross aldol condensation between acetaldehye and EXCESS of formaldehyde in PRESENCE of NaOH first GIVES tris(hydroxymethyl) acetaldehyde which upon subsequent cross cannizzaro reaction with more formaldehyde gives pentraerythitol and sodium formate.  Pentaerythiritol on nitration with conc. `HNO_(3)` gives pentaerythritol tetranitrate `(PETN)` `underset("Pentaerythiritol")(C(CH_(2)OH)_(4))+4HNO_(3)tounderset("PETN")(C(CH_(3)ONO_(2))_(4))+4H_(2)O` PETN mixed with AMMONIUM nitrate is used as a deadly explosive. PETN has been replaced in many applications by RNX which is thermally more stable and has longer shelf life. |
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| 19395. |
Which of the following ion is the smallest ion |
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Answer» `O_(2)^(+)` |
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| 19396. |
Which pair of the gaseous species diffuse through a small jet with the same rate of diffusio at same P and T : |
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Answer» NO, CO |
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| 19397. |
Which of the following has minimum values of cation-anion size ratio ? |
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Answer» NaCl |
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| 19398. |
When is treated with proton acid, a resonance stablized cation is produced. Which dience listed below when treated with acid will give the same carbocation? |
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Answer»
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| 19399. |
The value of equlibrium constant of the reaction HI_((g))hArr1/2H_(2(g))+1/2I_(2)is 8.0 The equilibrium constant of the reaction H_(2(g))+I_(2(g))hArr2HI_((g)) will be |
| Answer» SOLUTION :`K_(C)=((1)/(8))^(2)=1/64.` | |
| 19400. |
Whose name is not associated with the development of Periodic Table |
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Answer» PROUT's |
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