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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.
| 21251. |
Which of the following molecule has some dipole moment :- |
| Answer» ANSWER :D | |
| 21253. |
What is the standard electrode potential for the electrode MnO_(4)^(-)//MnO_(2) in solution ? ("Given: "E_(MnO_(4)^(-)//Mn^(2+))^(@)=1.51" volt," E_(MnO_(2)//Mn^(2+))^(@)=1.23"volt") |
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Answer» `E^(@)=(5xx1.51-2xx1.23)/(3)=(7.55-2.46)/(3)=5.09/3=1.70` volt |
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| 21254. |
Which of the following demonstrates a decrease in entropy ? |
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Answer» DISSOLVING a solid into solution |
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| 21255. |
X underset("(Reductive)") overset("Ozonolysis")to Y + Z Y can be obtained by Etard's reaction, Z undergoes disproportionation reaction with concentrated alkali. X could be |
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Answer»
 'Z' reacts with CONC. NaOH, `underset('Z'"")underset("Formaldehyde")(2HCHO+NaOH)underset("Cannizzaro's reaction")OVERSET("Disproportionation")rarr underset("Sodium FORMATE")(HCOONa+CH_(3)OH)` |
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| 21256. |
Which of the following aldehyde forms stablehydrate ? |
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Answer» Trichloroacetaldehyde |
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| 21257. |
Which of the following combination of statements is true regarding the interpretation of the atomic orbital? (a) An electron in an orbital of high angular momentum stays away from the nucleus than an electron on the orbital of lower angular momentum. (b) For a given value of the principal quantum number, the size of the orbit is universally proportional tothe azimuthal quantum number. (c) According to wave mechanics, the ground state angular momentum is equal to (d) The plot ofvs r for various azimuthal quantum numbers, shows peak shifting towards higher r value. |
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Answer» (a) , (B) |
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| 21258. |
Which of the following NOT CORRECTLY matched ? |
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Answer» PHENOL `+CHCl_3+NaOH to ` Saliyladehyde |
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| 21259. |
What is the chemical name of DDIT? State the environmental effects. |
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Answer» SOLUTION :The CHEMICAL name DDT is p.p'-Dichlorodiphenyltri chlorothane. (1)DDT is not READILY metabolised by animals. (2) It is deposited and STORED in fatty tissues. |
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| 21260. |
Which of the following elements is responsible for oxidation for water to O_2 in the biological process? |
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Answer» Fe |
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| 21261. |
Which formation of iron is least ductile? |
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Answer» HARD steel |
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| 21262. |
Xoverset("Step-1")toYoverset("Step-II")toZ is complex reaction total order of reaction is 2 and step -II is sloW step.What is molecularity of Step-II? |
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Answer» 1 |
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| 21263. |
What happenswhenglucose reactswith (i) Br_(2)//H_(2)O(ii) Conc. HNO_(3) |
Answer» SOLUTION :
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| 21264. |
Write one chemical equation for each to illustrate the following reaction: Cannizzaro reaction |
| Answer» SOLUTION :`2HCHO OVERSET(`50%` KOH`)rarr HCOOK+CH_3OH` | |
| 21266. |
Which of the compounds will react faster in S_(N)1 reaction with the ""^(-)OH ion ?CH_(3)-CH_(2)-Cl OR C_(6)H_(5)-CH_(2)-Cl |
| Answer» Solution :`C_(6)H_(5)-CH_(2)-Cl` will react faster in `S_(N)1` because the REACTION will pass through more stable benzyl carbocation `(C_(6)H_(5)OVERSET(+)(C )H_(2))` intermediate. | |
| 21267. |
What is the value of one Bohr magneton in S.I. units? |
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Answer» Solution :Bohr magneton (BM) is given in Si units as, `BM = 9.273 xx 10^(-24) J T^(-1)` The value of BM is obtained from the relation. `BM = (eh)/(4pi mc)` Heree is charge of electron (in COUL), H is Plancks CONSTANT (in J, sec) m is mass of electron (in Kg) and C is velocity of LIGHT. |
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| 21268. |
Which one of the following can be obtained by halide exchange method: |
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Answer» `CH_3Cl` |
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| 21269. |
What are (A), (B), (C) and (D) |
| Answer» Solution :(A): LIH. (B): LIOH - (C): `H_(2)` (D):`LiAIH_(4)` | |
| 21270. |
What do you mean by activity and selectivity of catalysts? |
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Answer» Solution :The important features of solid catalysts are as below : (a) Activity : The activity of a catalyst depends upon the strength of chemisorption to a large EXTENT. Theeactants must get adsorbed reasonably strongly on to the catalyst to BECOME active. However, they must not get adsorbed so strongly that they are immobilised and other reactants are left with no space on the catalyst.s surface for adsorption. `2H_(2(g))+O_(2(g))overset(Pt)rarr2H_(2)O_((l))` (b) Selectivity: The selectivity of a catalyst is its ability to direct a REACTION to yield a particular product selectively, when under the same reaction conditions MANY products are possible. Selectivity of different catalyst for same reactants is different. For example starting with H, and CO and using different catalysts, we get different products. (i) `CO_((g))+3H_(2(g))overset(Ni)rarrCH_(4(g))+H_(2)O_((g))` (ii) `CO_((g))+2H_(2(g))overset(Cu//ZnO-Cr_(2)O_(3))rarr CH_(3)OH_((g))` (iii) `CO_((g))+H_(2(g))overset(Cu)rarr HCHO_((g))` Thus, it can be inferred that the action of a catalyst is highly selective in nature. As a result, a substance which acts as a catalyst in one reaction may fail to catalyse another reaction. |
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| 21271. |
Which reagent is more effective to convert but-2-enal to but-2-enol: |
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Answer» `K_2Cr_2O/H_2SO_4` |
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| 21273. |
Which dispositive ion of following metals from most stable coordination complex with ammonia ? |
| Answer» Answer :C | |
| 21274. |
Volume of a colloidal particle, V_(c ) as compared to the volume of a solute particle in a true solution. V _(s) could be : |
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Answer» `(V _(c ))/(V _(s)) =1 ` `(V _(c))/(V _(s)) = ((4)/(3 ) pi r _(c ^(3)))/((4)/(3) pi r _(s) ^(3)) = ((r_(c))/(r _(s)))^(3)` Putting ratio of diameters in place of `(r _(c))/(r _(s))` Ratio of diameters `= ((10)/(1)) ^(3) = 10 ^(3)` `therefore (V _(c))/(V _(s)) ~~ 10 ^(3)` |
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| 21275. |
What is crystal lattice (space lattice) ? |
| Answer» Solution :Crystal LATTICE (SPACE lattice) : A REGULAR arrangement of the constituent PARTICLES (atoms, ions or MOLECULES ) of a crystalline solid having similar environment in three dimensional space is called crystal lattice or space lattice. | |
| 21276. |
Which of the following reactions does NOT occur in blast furnace ? |
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Answer» Combustion of coke with OXYGEN from the HOT air. |
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| 21277. |
Which is not a coinage metal ? |
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Answer» Cu |
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| 21278. |
Which of the followingwill not produce ethane? |
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Answer» Reducing of `CH_(3)COOH` with `HI//P_(4)` `CH_(3)-overset(O)overset(||)(C)-CH_(3)+4HI underset(423K)overset("red P")to CH_(3)CH_(2)CH_(3)+H_(2)O+2I_(2)` |
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| 21279. |
Which of the following molecules is expected to rotate the plane of polarised light? |
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Answer»
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| 21280. |
Which of the following solutions of KCl has the lowest value of equivalent conductance ? |
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Answer» 1M |
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| 21281. |
Which of the following will respnd to carbyl amine test ? |
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Answer» <P>N-methylaniline |
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| 21282. |
Which of the following ion has smallest radii ? |
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Answer» `Yb^(3+)` |
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| 21283. |
The wire of flash bulbs are made up of: |
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Answer» Mg |
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| 21284. |
What happens when H_2O_2reacts with Cl2? |
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Answer» SOLUTION :Hydrozen chloride (HCL) and OXYGEN `(O_2)` are FORMED `H_2O_2 + Cl_2rarr 2HCL+ O_2` |
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| 21285. |
Which one of the following reactions cannot be used for the reduction of |
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Answer» CLEMMENSEN REACTION `RCOR to RCH_(2)R`. |
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| 21286. |
Why activated charcoal is a better absorbent than ordinary charcoal ? |
| Answer» Solution :The ACTIVATED charcoal acts as a better ADSORBENT than ORDINARY charcoal, because activation ENERGY involved in the the process of adsorption in former case is lower than that in later case of ordinary charcoal. | |
| 21287. |
Which of the following reduces Tollen's reagent? |
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Answer»
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| 21288. |
Which of the following compound will not give positive test with NaHCO_(3).? {:("Phenol"",",CH_(3)COOH",",CH_(3)CH_(2)SO_(3)H",",CH_(3)C-=CH",",CH_(3)CH_(2)OH","),("Phthalic acid" ,"Salicylic acid" ",","Cinammic acid","Lactice acid",P-"Cresol"):} |
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Answer» |
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| 21289. |
Which of the following molecule would have a carbon halogen bond most susceptible to nucleophilic substitution ? |
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Answer» 2-Flourbutane |
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| 21290. |
What is order of reaction ? |
| Answer» Solution :Order of a reaction is DEFINED as the SUM of the exponents to which the concentrations of the reacting SPECIES are RAISED in the rate expression of the reaction | |
| 21291. |
Why alkyl halides, though polar, are immiscible with water ? |
| Answer» Solution :In water `H_(2)O` molucules are bonded together by H-bond. Although alkylhalide also contain polar C-X BANDS, they cannot BREAK the H-bond in `H_(2)O` molecule. THEREFORE they exist as SEPRATE layers and are IMMISCIBLE with each other. | |
| 21292. |
Which of the following oxides of nitrogen is paramagnetic |
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Answer» `N_(2)O_(3)` |
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| 21293. |
Which among the following is a false statement ? |
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Answer» `SiO_(2)`has a structure similar to that of`CO_(2)` (B) Because of its great AFFINITY for oxygen, Si always OCCURS as the oxide, silica`(SiO_(2))`or in the form of silicates, which are the compounds of `SiO_(2)`with other metal oxides. (C) `SiO_(2)+2Mg to Si+2MgO` (D) The reluctance of silicon to form `p pi-p pi`bonds to itself is clearly shown by the fact that silicon does not exist in graphite-like structure, but only in diamond like structure. |
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| 21294. |
Which of the followingcan be used as monomer in a polymerisation reaction |
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Answer» `CH_(3)CH_(2)Cl` |
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| 21295. |
Which of the following compunds is capable of showing geometrical,optical and conformational isomerism. |
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Answer»
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| 21296. |
Which of the following are used for post operative pain and pain of terminal cancer? |
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Answer» morphine, CODEINE |
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| 21298. |
Which of the following statement is true regarding electrolysis of molten IC l ? |
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Answer» `I_2` is liberated at the cathode |
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| 21299. |
The secondary structure of a protein refers to |
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Answer» hydrophobic interactions |
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| 21300. |
Which of the following given ratio of units of length gives the highest value? |
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Answer» `frac{1PM}{1fm}` |
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