InterviewSolution
Saved Bookmarks
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.
| 9601. |
Which expression is correct for the work done in adiabatic reversible expansion of an ideal gas |
|
Answer» `W=nRTln.(V_(2))/(V_(1))` |
|
| 9602. |
Which of the following is ( are ) function (s) of salt bridge ? |
|
Answer» It COMPLETES the electrical CIRCUIT with electrons FLOWING from one electrode to other through wires and FLOW of ions between the two compartments through SALT bridge. |
|
| 9603. |
What is the medicinal use of narcotic drugs ? |
| Answer» SOLUTION :Since narcotic DRUGS relieve pain and produce sleep, therefore, these are chiefly used for the RELIEF of POST operative pain, cardiac pain and pains of TERMINAL cancer, and in child birth | |
| 9604. |
Which of the following is a non-narcotic analgesic? |
|
Answer» MORPHINE |
|
| 9605. |
What effect is noticed on shaking dilute sulphuric acid with a small quantity of anhydrous copper sulphate ? |
|
Answer» The WHITE solid dissolves to from a colourless solution |
|
| 9606. |
Which would Ihave trigonal planar shape ? |
|
Answer» `CH_(3)` |
|
| 9607. |
Which pair of two isomeric complexes is difficult to differentiate by measuring molar electrical conductivity ? |
|
Answer» `[CO(NH_(3))_(5)SO_(4)]Cl,[Co(NH_(3))_(5)Cl]SO_(4)` |
|
| 9608. |
To an evacauted 504.2 mL steel container is added 25 g CaCO_(3) and the temperature is raised to 1500K causing a complete decomposition of the salt. If the density of CaO formed is 3.3 g//cc, find the accurate pressure developed in the container using the Van der waals equation of state. The van der waals constants for CO_(2)(g) are a = 4 (L^(2)-atm)/(mol^(@)), b = 0.04 (L)/(mol). (ca-40, C -12 ,O -16). Report your answer as nearest whole number. |
|
Answer» |
|
| 9609. |
Which of the following is not an example of rubber ? |
|
Answer» POLYCHLOROPRENE |
|
| 9610. |
When an electron in an excieted 'Mo'atom falls from 'L' to 'K' shell , an X-ray is emitted.... These X-rays are diffracted at one angle of 7.75^(@) by planes with a separation of 2.64A^(@). What is the difference its energy between K-shell and L-shell in 'Mo' assuming a first order diffraction. |
| Answer» SOLUTION :`2.79 XX 10^(-15) J` | |
| 9611. |
Which of the following sets of complexes is/are correct with respect to the properties indicated against each ? |
|
Answer» `[V(CO)_6],K_4[Mn(CN)_6], Cs_2[CuF_6]`-Low spin octahedral complex with one unpaired electron `K_4[Mn(CN)_6]-d^2sp^3` containing one unpaired electron `(d^5)` `[CuF_6]^(2-)`-It is a low spin octahedral complex with one unpaired electron `(d^7)` (B)`[NiCl_4]^(2-) and [NiCl_2(PPh_3)_2]-sp^3` containing two unpaired electrons `(d^8)` `[NiCl(PPh_3)_3]-sp^3` containing one unpaired electron `(d^9)` (C )`[CuF_4]^(-)`-diamagnetic planar complex with `d^9` CONFIGURATION . `[Cu(CN)_4]^(3-)`-diamagnetic tetrahedral complex with `d^10` configuration. (D)`[Fe(CN)_6]^(4-)`-diamagnetic with +2 oxidation state of iron. `[Fe(H_2O)_5NO^(+)]` -paramagnetic with +1 oxidation state of iron. `[Fe(CN)_5NO^(+)]^(2-)`-diamagnetic with +2 oxidation state of iron. |
|
| 9612. |
Which of the following compound is more reactive in nucleophilic substitution reaction? |
|
Answer» o-bromotoluene |
|
| 9613. |
Zonerefiningisbasedon the principlethat ......... . |
|
Answer» impuritiesof lowboilingmetalscanbeseparatedby DISTILLATION |
|
| 9614. |
Which of the following is generally prepared by chain growth free-radical polymerization? |
|
Answer» Polyacrylonitrile Which further reacts with another ethylene molecule and so on: Very quickly a long chain `CH_(2)` groups is built, eventually this PROCESS is terminated by the combination of two long chain radials to give the polymer called polyethylene: where `(CH_(2) - CH_(2))` is a conveneient shorthand convention for representing unit in the polymer. The value of `n` is understood to be vary large, con the other of hundreds. Polyethylene (in which every `C` atom is `sp^(3)` hybridized) is a very stable and quite inert substance. The individual chains pack together well and so ACCOUNT for the crystalline properties is the material. Polyethylene is mainly used in films in frozen food packing and other product wrapings. A specially treated type of polyethylene called Tyve is used for home insulation. Polymers that are made from only one type of nonomer, as polythene is, are called homopolymers. Other inportant homopolymers are Teflon, polytetrafluoroethy lene: `- (CF_(2) - CF_(2))_(n)` and polyvinyl chloride: `(-CH_(2)-underset(CI)underset(|)(CH-))_(n)` The chemistry becomes more complex if the starting units are asymmetric: Several structurally different polymers can result from ad addition reaction of propylenes. If the additions occur randomly, we obtain the atactic polypropylenes, which do not pact together well. These polymers are rubbery, amorphous, and realtively weak. The two other possibilities are an isotactic structure, in whichthe R-group are all on the same side of the asymmeric carbon atoms, and asyndiotactic the asymmetric carbons. Of these, the isotactic isomer has a higher melting point and greater crystallinity and is endowed with superior mechanical proterties.    
|
|
| 9615. |
Which of the following term means pain killing |
|
Answer» ANTIPYRETIC |
|
| 9616. |
Write IUPAC names of the following compounds : (i) CH_(3)-underset(CH_(3)) underset(|)(CH)-CH_(2)- underset(OH) underset(|)(CH)-overset(CH_(3)) overset(|)underset(CH_(3)) underset(|)C-CH_(3) (ii) H_(3)-C- underset(OH) underset(|)(CH)-CH_(2)- underset(OH) underset(|)(CH)- underset(C_(2)H_(5)) underset(|)(CH)-CH_(2)-CH_(3) CH_(3)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-CH_(3) (iv) HO-CH_(2)-underset(OH) underset(|)(CH)-CH_(2)-OH |
|
Answer» Solution :(i) 2,3,4- Trimethylpentan -3-ol (ii) 5-Ethylheptane2,5 diol(iii) Butane-2,3-diol (iv) Propane-1,2,3-triol (V)2-METHYLPHENOL (VI) 4. Methylphenol (vii) 2,5 Dimethylphenol (viii)2,6- Dimethylphenol (ix) 1-Methoxy 2-methylpropane (x)ETHOXYBENZENE (XI) 1--Phenoxyheptane (xii) 3-Ethoxybutane |
|
| 9617. |
What type of linkage is present is nucleic acids ? |
| Answer» Solution :The constituents of nucleic acids (RIBOSE or deoxyribose , sugar , purine or pyrimidine base and phosphoric acid) are joined through covalent linkage whereeas DNA consists of two strands, RNA has a single strand. The two strands of DNA are linked together through hydrogen BONDS. | |
| 9618. |
Which of the following transformations is not correct ? |
|
Answer» `_33^75 As +_2^4 He to _35^78 BR +_0^1 N` |
|
| 9619. |
When concentration approaches zero, the molar conductivity is known as _______ |
| Answer» SOLUTION :LIMITING MOLAR CONDUCTIVITY | |
| 9620. |
Which one is not a glyceride : |
|
Answer» Fat |
|
| 9621. |
Which of the following amines reacts most rapidly with para-nitrophenylacetate, p-NO_(2)C_(6)H_(4)OCOCH_(3)? |
|
Answer» para-Methoxyaniline,.`p-CH_(3)OC_(6)H_(4)NH_(2)` |
|
| 9622. |
What is the major product when propene is treated with HI ? |
| Answer» SOLUTION :2-iodoethane | |
| 9623. |
Time required to decompose SO_2CL_@to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction. |
| Answer» SOLUTION :`k=0.693/(t_1/2)=0.693/(60xx60seconds)=1.925xx10^(-4)s^(-1)` | |
| 9624. |
Which of the group 15 elelments are non-metallic ? |
|
Answer» N `NaNO_3 + 4Zn + 7NaOH rarr 4 Na_2 ZnO_2 + NH_3 + 2H_2 O` `NH_4 NO_2 (A) + NaOH rarr NH_3 + NaNO_2 + H_2 O` `3 Zn + 5 NaOH + NaNO_2 rarr 3 Na ZnO_2 + NH_3 + H_2 O`. |
|
| 9625. |
What is the atomic number of iron and chromium in chromite ore? |
|
Answer» SOLUTION :ORE of CHROMITE `FeOCr_(2)O_(3)` Oxidation number of Iron= +2 Oxidation number of chromium = +3 |
|
| 9626. |
Tonics usually contain small amount of : |
|
Answer» Formalin |
|
| 9628. |
Which ores are concentrated by froth floatation process? |
| Answer» Solution :Sulphide ores | |
| 9629. |
What are biological catalyst in reality? |
|
Answer» Enzyme |
|
| 9630. |
Which is correct about vanillin ? |
|
Answer» A flavouring AGENT having VANILA flavour |
|
| 9631. |
What criterion is followed for the selection of the stationary phase in chromatography? |
| Answer» SOLUTION :The stationary phase is selected in such a way that the impurities are more STRONGLY adsorbed by the stationary phase than element to be purified. Under these conditions, when the column is EXTRACTED, the impurities are retained by the stationary phase while the PURE component is easily eluted. | |
| 9632. |
Which of the following is not dehydrating agent? |
|
Answer» `H_2SO_4` |
|
| 9633. |
Which of the following contain asymmetric carbon atom – |
|
Answer» `CH_(3) - CH_(2) - CH_(2) -BR` |
|
| 9634. |
Which of the following gives an optically active compound when reacted with sodium borohydride NaBH_(4)? |
|
Answer»
|
|
| 9635. |
What are enzymes? Write a brief note on the mechanism of enzyme catalysis. |
|
Answer» Solution :Enzymes are complex protein molecules with three dimensional structures. They catalyse the chemical reaction in living organism. They are often present in colloidal state and extremely specific in catalytic action. Each enzyme produced in a particular living cell can catalyse a particular reaction in the cell. Mechanism of enzyme catalysis: Mechanism of enzyme catalysed reaction is known as lock and key mechanism. (i) Enzymes are highly specific in their action. (ii) These specificity is due to the PRESSURE of active sites. The shape of active site of any given enzyme is like cavity such that only a specific substrate can fit into it. In the same way a key fit into lock. The specific binding needs to the FORMATION of an enzyme substrate complex which ACCOUNTS for high specificity of enzyme catalysed reactions. (iii) Once the proper orientation is attained the substrate molecules reacts to form the product in two steps. (iv) Since product molecule do not have any AFFINITY for the enzyme they leave the enzyme surface making room for fresh substrate.  Step : 1 Formation of enzyme - substrate complex `underset("(Enzyme)")(E) + underset("(Substrate)")(S) iff underset("(Complex)")(ES)` Step 2: Dissociation of enzyme-substratecomplexto form product `underset("(Complex)")(ES) iff underset("( Enzyme Product Association)")([EP]) to underset("Slow step reaction")( underset("(Enzyme)")(E) + underset("(Product)")(P))` The rateof the formation of product depends upon concentration of ES . |
|
| 9636. |
The set of chemical reactions by which the various molecules of the cell are synthesized is called |
|
Answer» Anabolism |
|
| 9637. |
Which of the following substances is used as the gaseous dielectric in high voltage transformers ? |
|
Answer» `SF_4` |
|
| 9638. |
Which of the following can show coordination isomerism ? |
|
Answer» `[Cu(CN)_(4)][PtCl_(4)]` |
|
| 9639. |
Write the order of thermal stabillity of the hydrides of group 16 elements. |
| Answer» Solution :As the size of the element increases down the GROUP, the E-H bond length increases. In other words, the E-H bond DISSOCIATION energy decreases and hence E-H bond breaks more easily. Thus, the thermal stability of the hydrides of group 16 elements decreases downthe group, i.e., `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te gt H_(2)Po`. | |
| 9640. |
Which is low spin complex? |
|
Answer» `[Fe(CN_(6))]^(3-)` |
|
| 9641. |
Which of the following alkenes is expected to be more reactive towards electrophilic addition reactions ? |
|
Answer» `(CH_(3))_(2)C = CH_(2)` This reaction proceeds through the formation of STABLE `(3^(@))` carbocation ion while OTHERS proceed through the formation of relatively less stable `(1^(@) or 2^(@))` carbocations. |
|
| 9642. |
Write the structures of the following organic halogen compounds.4-tert-Butyl-3-iodoheptane |
| Answer» Solution :`CH_(3)-(CH_(2))_(2)-UNDERSET(H_(3)C-underset(CH_(3))underset("|")("C ")-CH_(3))underset("|")("C ")H-OVERSET("I")overset("|")("C")H-CH_(2)-CH_(3)` | |
| 9643. |
What happens when XeF_(4) reacts with SbF_(5) ? |
|
Answer» Solution :`XeF_(4)` REACTS with fluoride ion acceptor such as `SbF_(5)` to form cationic species. `XeF_(4) + underset("Fluoride ion acceptor")(SbF_(4)) RARR [XeF_(3)]^(+)[SbF_(6)]^(-)` |
|
| 9644. |
What are the different ways of initiating addition polymerisation ? Describe one of them for polymerising vinyl chloride. |
|
Answer» Solution :Polymerisationcan be initiatedin three WAYS : (ii) Free RADICAL polymersiationusing `H^(+)`asinitiator . (ii) Cationicpolymersiationusing`H^(+)` as INITIATOR . (iii)Anionicpolymerisation using`KNH_(2)`asinitiator . Free radicalpolymerisationof vinyl chloride . In `to`In ( In stands for free radical initator and In forfree radical). In`+ CH_(2)= underset(Cl) underset(|)(CH)to` In `-CH_(2) - underset(Cl)underset(|)(CH) + CH_(2) = underset(CI)underset(|)(CH)to In (-CH_(2) - underset(CI)underset(|)(CH)-)_(N)` |
|
| 9645. |
Which of the following hydrides is electron precise hydride |
|
Answer» `B_(2)H_(6)` |
|
| 9647. |
The water of crystallisation in 1 mole of washing soda crystal is: |
|
Answer» 5 |
|
| 9648. |
The standard oxidation potential of Zn and Ag in water at 20^(@) C" are: " Zn(s) rarr Azn^(2+) (aq) + 2e^(-) E^(o) = 0.76 V Ag(s) rarr Ag^(+)(aq) +e^(-) E^(o) = - 0.80 V Which one of the following reactions actually takes place? |
|
Answer» `Zn(s) + 2 Ag^(+)(aq) RARR Zn^(2+) + 2 Ag(s)` |
|
| 9649. |
Which elements can be obtained as anode mud in purification reaction of copper by electrolysis ? |
|
Answer» AL, Ni |
|
| 9650. |
Which is/are correct statements? |
|
Answer»
|
|
