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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.
| 13251. |
Which of the following choices match(es) with hydrogen gas at P = 200 and T = 273K ? |
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Answer» `Zne1` |
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| 13252. |
What is true out of the following ? |
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Answer» FLUORINE REDUCES WATER to oxygen |
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| 13253. |
Which of the following reactiongives H_(2) gas ? |
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Answer» `NaNH_(2)+H_(2)O rarr` `underset(("conc."))(Zn+H_(2)SO_(4))rarrZnSO_(4)+SO_(2)uarr +H_(2)O` `Zn+aq. NaOH rarr Na_(2)ZnO_(2)+H_(2)uarr` `CaH_(2)=H_(2)O rarrCa(OH)_(2)+H_(2)uarr` |
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| 13254. |
Transition elements should be more reactive than hydrogen on the basis of electrode potential. But most of them do not give hydrogen on reaction with dilute acids because |
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Answer» an OXIDE layer is formed on their surface. |
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| 13255. |
Total number of compound which can shows tautomerism are :- |
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Answer» 1 |
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| 13256. |
Whatis essentially the differencebetweenalpha- fromof glucose? Explain. |
Answer» SOLUTION :Thetwo froms ofglucosediffer in theconfigurationof thehydroxyl group at `C_(1)`, calledtheanomeric CARBON. The TWO forms of GLUCOSEARE given below . 
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| 13257. |
What is the role of benzoyl peroxide in addition polymerisation of alkenes ? Explain its mode of action with the help of an example. |
Answer» SOLUTION :Benzoyl peroxide acts as a RADICAL INITIATOR in the polymerization of ethene 
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| 13258. |
What volume of O_(2)at NTP liberated by 5 A current flowing for 193 and through acidulated water ? |
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Answer» Solution :`W = ( I xx t xx E)/(F) = (5 xx 193 xx 8)/(96500)= 0.08 G ` At NTP , volume of 32 g of `O_(2)` = 22400 mL `therefore 0.08` g = x ` x = (22400 xx 0.08)/(32) = 56 ` mL |
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| 13259. |
The sodium extract of an organic compound on acidification with acetic acid andaddition of lead acetate solution gives a black precipitate. Theorganic compound contains |
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Answer» Nitrogen |
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| 13260. |
Which is not electromagnetic radiation ? |
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Answer» INFRARED RAYS |
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| 13261. |
The units of rate constant and rate of reaction are identical for : |
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Answer» ZERO order REACTION `:.` Units of rate and k are same . |
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| 13262. |
Which of the following is the weakest nucleophile in aprotic solhent. |
| Answer» SOLUTION :WEAKEST NUCLEOPHILE is [F] | |
| 13263. |
Which of the following has longest [CO(CN)_(6)]^(3-) bond length? |
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Answer» `[Co(CN)_(6)]^(3-)` has FOUR unpaired electrons and will be in a high-spin CONFIGURATION |
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| 13264. |
When benzenediazonium chloride is warmed with methanol, the product formed is |
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Answer» benzene |
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| 13265. |
Which of the following organic compounds unable to give precipitation after reaction with silver nitrate (AgNO_3) ? |
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Answer»
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| 13266. |
Which of the following can possibly be used as analgesic , without caousing addiction and unconsiousness? |
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Answer» MORPHINE |
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| 13267. |
What do you understand by mild tranquilizer? Give examples. |
| Answer» SOLUTION :MEPROBAMATE and chlorodiazepoxide are MILD tranquilizers. They are suitable for RELIEVING TENSION. | |
| 13268. |
Which of the following processe (s) during the extraction of copper from chalcopyrites ? (1) Froth floatation (2) Roasting (3) Bassemerisation (4) Leaching |
| Answer» Answer :C | |
| 13269. |
What is the size of colloidal particle ? |
| Answer» SOLUTION :`10^-9`m or `10^-7`m. | |
| 13270. |
The relative acidic strengths of benzoic acid, o- toluic acid and p- toluic acid is of the decreasing order : |
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Answer» p- toluic ACID `gt` o- toluic acid `gt` BENZOIC acid |
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| 13271. |
Which of the following carboxylic acid is more reactive towards Esterification with alcohols? |
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Answer» `CH_3 COOH` |
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| 13272. |
Which one of the reactions gives an explosive RDX? |
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Answer» NITRATION of PHENOL |
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| 13273. |
Using uncertainity principle,calculate the uncertainty in velocity ofan electron if the uncertainty in position is 10^(-4) m . |
| Answer» SOLUTION :`0.577 m SEC^(-1)` | |
| 13274. |
underset((a))CH_(3)-C-=C-underset((b))(CH_(2)-CH)=CH-CH_(2)-underset((c))(overset(O)overset(||)(C))-Cl Reactivity toward catalytic hydrogenation |
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Answer» `a GT B gt C` |
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| 13275. |
Which of the following halic acid and maximum oxidising strength? |
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Answer» `HClO_3` |
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| 13276. |
What is an aqua regia ? Give its one use. |
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Answer» Solution :Aqua regia is a MIXTURE of 1 : 3 by volume of CONE . `HNO_(3) ` and Cone . HCl. Aque regia is used to dissolve to dissolve NOBLE metals like Au and pt. `Au+4H^(+)+NO_(8)^(-)+4Cl^(-)rarrauCl_(4)^(-)+2H_(2)O+NO` |
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| 13277. |
When CO is heated with NaOH under pressure we get |
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Answer» SODIUM oxalate |
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| 13278. |
The time taken for 10% completion of a first order reaction is 20 mins. Then, for 19% completion, the reaction will take |
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Answer» 40 mins `k=(2.303)/(x) log (100)/((100-19))`…(II) On equating (i) and (ii), `x=(20(2-log81))/((2-log90))`=40 mins |
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| 13279. |
Which is not considered as a constituent of portland cement? |
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Answer» `Ca_2SiO_4` |
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| 13280. |
Which of the following carbonium ions has the least stability ? |
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Answer» METHYL |
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| 13281. |
The reagent can be used to distinguish between cane sugar and lactose is |
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Answer» BAYER's reagent |
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| 13282. |
Which of the following pair hasmoreor less same atomicradius due to lanthanide contraction? |
| Answer» Solution : Zr and Hf | |
| 13283. |
Which of the following reactions is not exothermic |
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Answer» `C(s)+O_(2)(g)rarrCO_(2)(g)` |
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| 13284. |
Which one of the following is NOT ture for bleaching powder ? |
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Answer» It is used as a reducing AGENT in chemical INDUSTRIES |
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| 13285. |
Which of the following binary mixtures will have same composition in liquid and vapour phase? |
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Answer» BENZENE - Toluene |
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| 13286. |
The reagent of choice for the selective reduction of a keto group in the presence of an ester functional group is : |
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Answer» LITHIUM ALUMINIUM hydride |
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| 13287. |
Which compound in each of the following pairs will react faster in S_(N)2reaction with - OH ? (i) CH_(3)Br " or " CH_(3) I "" (ii) (CH_(3))_(3)C Cl " or " CH_(3)Cl |
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Answer» Solution :(i) Since `I^(-)`ION is a better leaving group than Brion, THEREFORE, `CH_(3) I`REACTS faster than `CH_(3)Br` . (ii) On STERIC consideration, `1^(@) ` halides are more reactive than tert-alkyl halides in `S_(N)2`REACTIONS. Therefore, `CH_(3)Cl`will react at a faster rate than`(CH_(3))_(3) C Cl `. |
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| 13288. |
Theory of 'active mass' indicates that the rate of a chemical reaction is directly proportional to the |
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Answer» EQULIBRIUM constant |
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| 13289. |
Which of the following is a double salt? |
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Answer» Carnalite |
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| 13290. |
Which amongst the following metal carbonyls are inner orbital complex with diamagnetic property (i) Ni(CO)_(4) (ii) Fe(CO)_(5) (iii) V(CO)_(6) (iv) Cr(CO)_(6) Select the correct code :- |
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Answer» I & II |
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| 13292. |
The section contains one question. Each question contains statements given in two columns which have to be matched . The statements in Column I are labelled A, B, C and D , while the statements in Column II are labelled p,q, r, s and t. Any given statement in Column I can have correct matching with ONE OR MORE statements (s) in Column II . The appropriate bubbles corresponding to the answers to these questions have to be darkened as illustrated in the following example: If the correct matches are A-p, s and t, B-q and r, C-p and q, and D-s and t, then the correct darkening of bubbles will look like the following . Match the following : |
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Answer» <P> USING phenolphthalein INDICATOR . eq of `Na_(2)CO_(3)` will react. ` :. 1^(st)` titre value `Na_(2) CO_(3) + HCl to NaHCO_(3)+ NaCl` ` :. 1^(st) ` titre value = eq of`Na_(2)CO_(3)` Using methyl orange indicator : eq of `NaHCO_(3) ` produced from `Na_(2)CO_(3)` & eq of `NaHCO_(3)` present will react : `NaHCO_(3) + HCl to NaCl + H_(2)O + CO_(2)` ` :. 2^(nd) ` titre value = eq of `Na_(2)CO_(3) + " eq of " NaHCO_(3)` . ` A to r, s` (B) `Na_(2)CO_(3) + NaOH` Using phenolphthalein indicator : `Na_(2)CO_(3)+HCl to NaHCO_(3) + NaCl` ` NaOH + HCl to NaCl + H_(2)O` ` :. 1^(st) ` titre value = eq of `Na_(2)CO_(3) + ` eq of NaOH . Using methyl orange indicator : `NaHCO_(3) + HCl to NaCl + H_(2)O + CO_(2)` (produced from `Na_(2)CO_(3)`) `2^(nd) ` titre value = eq of `Na_(2)CO_(3)` ` B to q,t ` (C ) `Na_(2)C_(2)O_(4) + H_(2)C_(2)O_(4)` Using `NaOH ` & phenolphthalein indicator : ` H_(2)C_(2)O_(4) + NaOH to Na_(2)C_(2)O_(4) + H_(2)O` ` :. 1^(st)` titre value of NaOH =eq. of `H_(2)C_(2)O_(4)` Using `KMnO_(4)` in acidic MEDIUM : Using `KMnO_(4)` in acidic medium : `KMnO_(4) + Na_(2)C_(2)O_(4) + H^(+) to CO_(2) + Mn^(2+) + H_(2)O + Na^(+)` `2^(nd)` titre value will give the eq of total `Na_(2)C_(2)O_(4) & H_(2)C_(2)O_(4)` but in different n-factor value . The estimation of `Na_(2)C_(2)O_(4)` can be done by the difference in moles of total `Na_(2)C_(2)O_(4) + H_(2)C_(2)O_(4) " in " 2^(nd) ` titration & moles of `H_(2)C_(2)O_(4) " in " 1^(st)` titration . But difference in `1^(st) & 2^(nd)` titre value will not give the estimation of `1^(st)` constituent. ` C to P ` (D) `H_(2)CO_(3) + NaHCO_(3)` Using NaOH & methyl orange indicator : `H_(2)CO_(3) + NaOH to NaHCO_(3) + H_(2)O` `1^(st)` titre value will give the estimation of `1^(st)` constituent. Using `NaOH` & phenolphthalein indicator : `NaHCO_(3) + NaOH to Na_(2)CO_(3) + H_(2)O` `uparrow` `(NaHCO_(3) " present + " NaHCO_(3) " preduced from " H_(2)CO_(3))` Difference in `2^(nd) & 1^(st)` titre value will give the estimation of `2^(nd)` constituent . `D to s, t` |
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| 13293. |
Which one of the following bonds has the highest average bond energy(kcal/mol): |
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Answer» S=O |
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| 13295. |
Which of the following compounds is expected to be most basic ? |
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Answer»
 
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| 13296. |
Which of the following order is correct? |
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Answer» `N_(2) gt F_(2) gtO_(2)`: Ionisation ENERGY |
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| 13297. |
The section contains one question. Each question contains statements given in two columns which have to be matched . The statements in Column I are labelled A, B, C and D , while the statements in Column II are labelled p,q, r, s and t. Any given statement in Column I can have correct matching with ONE OR MORE statements (s) in Column II . The appropriate bubbles corresponding to the answers to these questions have to be darkened as illustrated in the following example: If the correct matches are A-p, s and t, B-q and r, C-p and q, and D-s and t, then the correct darkening of bubbles will look like the following . Match the reactions in Column I with nature of the reactions/type of the products in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 xx 4 matrix given in the ORS. |
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Answer» |
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| 13298. |
What type of isomerism is shown by the following complexes? (i) [Cr(en)_(3)]^(3+) (ii) [Pt(NH_(3))_(4)][PtCl_(4)] |
| Answer» SOLUTION :(i) Optical ISOMERISM (ii) Coordination isomerism (because sone CL and `NH_(3)` ligands may interchange, e.g., `[Pt(NH_(3))_(3)Cl] [Pt(NH_(3))Cl_(3)]` | |
| 13299. |
What is PVC ? Give one use of it. |
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Answer» Solution :PVC is polyvinyl chloride . It is used for making RAIN COATS and TOYS. |
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| 13300. |
Which one of the compounds does not decolourised an acidified solution of KMnO_4 ? |
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Answer» `SO_2` |
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