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.
| 91001. |
(A) Ce^(4+) is used as an oxidising agent in volumetric analysis. (R) Ce^(4+) has a tendency to attain a stable + 3 oxidation state |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) |
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| 91002. |
(A): Ce^(4+) is a good oxidizing agent. (R): Sm^(2+) is a good reducing agent. |
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Answer» Both A & R are TRUE, R is the correct EXPLANATION of A |
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| 91003. |
A : ccp is more efficient than hcp. R : Packing fraction is different in both cases. |
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Answer» If both ASSERTION & REASON are true and the reason is the correct explanation of the assertion then MARK (1) |
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| 91004. |
(A) : CdS and As_(2)S_(3) both have yellow colour and precipitated by passing H_(2)S through solution in dil HCl. ® : Both can be separated by yellow ammonium sulphide. |
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Answer» `As^(3+)` belongs to group IIB |
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| 91005. |
A cation M^(3+) loses 3 electrons, its oxidation number becomes |
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Answer» `M^(6+)` |
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| 91006. |
(A) Cation carriers, e.g., H-Br,Cl-OH and Br-Br and oxidising agents such as O_(3) and R-O-O-R, etc. act as electrophilic reagents. (R) Electrophilec are Lewisbases. |
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Answer» If both (A) and(R) are CORRECT and (R) is the correct EXPLANATION of (A). |
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| 91007. |
(A): Catanation ability of sulphur is observed in polysulphides (R): A polysulphide with eight sulphur atoms is known |
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Answer» Both (A) and (R ) are true and (R ) is the correct EXPLANATION of (A) |
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| 91008. |
A catayst |
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Answer» INCREASES the average KINETIC ENERGY of reacting molecules |
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| 91009. |
A catalytic poison renders the catalyst ineffective because : |
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Answer» It is PREFERENTIALLY adsorbed on the catalyst |
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| 91010. |
A catalyst that can be employed for Friedel-Crafts acylation is |
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Answer» anhydrous `CuCl_(2)` |
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| 91011. |
A catalyst speeds up a chemical reaction by : |
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Answer» SHIFTING the equilibrium. |
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| 91012. |
A catalyst lowers the activation energy of a reaction in such a manner that rate constant at 27^(@) C uncatalysed reaction equals the rate constant at ._(-73^(@) Cfor cataysed reaction . By how many kJ activation energy barrier is reduced by catalyst? Activation energy for the reaction is 24kJ. |
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Answer» |
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| 91013. |
A catalyst lowers the activation energy of a reaction from 20 kJ mol^(-1) to 10 kJ mol^(-1). The temperature at which uncatalysed reaction will have same rate as that of catalysed at 27°C is |
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Answer» 327°C |
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| 91014. |
A catalyst lowers the activation energy for a certain reaction from 83.314 to 75 KJ "mol"^(-1) at 500 K . What will be the rate of reaction as compared to uncatalyst reaction ? Assume other things being equal |
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Answer» Double |
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| 91015. |
A catalyst is used in a reaction to : |
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Answer» CHANGE the NATURE of reaction products |
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| 91016. |
A catalyst is used |
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Answer» only for increasing the velocity of reaction. |
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| 91017. |
A catalyst is more effective in : |
| Answer» Answer :D | |
| 91018. |
A catalyst is a substance which enhances the rate of a chemical reaction without itself getting____________ in the reaction. |
| Answer» SOLUTION :USED up | |
| 91019. |
A catalyst is a substance which |
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Answer» INCREASES the equilibrium concentration of the product |
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| 91020. |
A catalyst is a substance which: |
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Answer» Increases the equilibrium concentration of the REACTION |
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| 91021. |
A catalyst is a substance which : |
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Answer» Alters the EQUILIBRIUM in a REACTION |
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| 91022. |
A catalystincreases therateof thetemperature |
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Answer» INCREASING `E_(a)` |
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| 91023. |
A catalyst increases the rate of reaction because it… |
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Answer» INCREASES the activation energy |
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| 91024. |
A catalyst increases the rate of the reaction by |
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Answer» INCREASING`E_(a)` |
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| 91025. |
A catalyst increases the rate of reaction because it: |
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Answer» Increases the activation energy |
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| 91026. |
A catalyst increases the rate of chemical reaction by providing an alternative reaction pathway which lowers the activation energy than the reaction pathway in its absence. A catalyst is not consumed and therefore does not appear in the chemical equation for the reaction. A homogenous catalyst is in the same phase as the ractants whilst a heterogeneous catalyst is in a different phase. The complex [Co(NH_(3))_(3)F]^(2+)+H_(2)Oto[Co(NH_(3))_(5)(H_(2)O+F^(-)]^(3+) and Rate =k["complex"]^(a).[H^(+)]^(b) The reaction is acid catalysed , i.e. [H^(+)] does not change during the reaction . Thus, rate =k'["complex"] where, k'=[H^(+)]^(b) The value of activation energy for a chemical reaction primarily depends on |
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Answer» temperature |
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| 91027. |
A catalyst increases the rate of chemical reaction by providing an alternative reaction pathway which lowers the activation energy than the reaction pathway in its absence. A catalyst is not consumed and therefore does not appear in the chemical equation for the reaction. A homogenous catalyst is in the same phase as the ractants whilst a heterogeneous catalyst is in a different phase. The complex [Co(NH_(3))_(3)F]^(2+)+H_(2)Oto[Co(NH_(3))_(5)(H_(2)O)+F^(-)]^(3+) and Rate =k["complex"]^(a).[H^(+)]^(b) The reaction is acid catalysed , i.e. [H^(+)] does not change during the reaction . Thus, rate =k'["complex"] where, k'=[H^(+)]^(b) If 'a' is the initial concentration and k is the rate constant of a zero order reaction , the time for the reaction to go to completion will be |
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Answer» `(K)/(a)` |
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| 91028. |
A catalyst increases the rate of reaction because it : |
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Answer» decreases the ACTIVATION energy |
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| 91029. |
A catalyst increases the rate of chemical reaction by providing an alternative reaction pathway which lowers the activation energy than the reaction pathway in its absence. A catalyst is not consumed and therefore does not appear in the chemical equation for the reaction. A homogenous catalyst is in the same phase as the ractants whilst a heterogeneous catalyst is in a different phase. The complex [Co(NH_(3))_(3)F]^(2+)+H_(2)Oto[Co(NH_(3))_(5)(H_(2)O+F^(-)]^(3+) and Rate =k["complex"]^(a).[H^(+)]^(b) The reaction is acid catalysed , i.e. [H^(+)] does not change during the reaction . Thus, rate =k'["complex"] where, k'=[H^(+)]^(b) Overall order of reaction is |
| Answer» ANSWER :B | |
| 91030. |
A catalyst increases the rate of chemical reaction by providing an alternative reaction pathway which lowers the activation energy than the reaction pathway in its absence. A catalyst is not consumed and therefore does not appear in the chemical equation for the reaction. A homogenous catalyst is in the same phase as the ractants whilst a heterogeneous catalyst is in a different phase. The complex [Co(NH_(3))_(3)F]^(2+)+H_(2)Oto[Co(NH_(3))_(5)(H_(2)O+F^(-)]^(3+) and Rate =k["complex"]^(a).[H^(+)]^(b) The reaction is acid catalysed , i.e. [H^(+)] does not change during the reaction . Thus, rate =k'["complex"] where, k'=[H^(+)]^(b) For the reaction , CH_(3)COCH_(3)+I_(2)overset(H^(+))(to) Products The rate is governed by the expression (dx)/(dt)=k["Acetone"][H^(+)] The order w.r.t. iodine is |
| Answer» ANSWER :A | |
| 91031. |
A catalyst increases the rate of chemical reaction by providing an alternative reaction pathway which lowers the activation energy than the reaction pathway in its absence. A catalyst is not consumed and therefore does not appear in the chemical equation for the reaction. A homogenous catalyst is in the same phase as the ractants whilst a heterogeneous catalyst is in a different phase. The complex [Co(NH_(3))_(3)F]^(2+)+H_(2)Oto[Co(NH_(3))_(5)(H_(2)O+F^(-)]^(3+) and Rate =k["complex"]^(a).[H^(+)]^(b) The reaction is acid catalysed , i.e. [H^(+)] does not change during the reaction . Thus, rate =k'["complex"] where, k'=[H^(+)]^(b) From the above data, value of a is : |
| Answer» ANSWER :A | |
| 91032. |
A catalyst increases the rate of a reaction with out changing ______ |
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Answer» energy of activation |
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| 91033. |
A catalyst increases the rate of a chemical reaction by |
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Answer» Increasing the ACTIVATION ENERGY |
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| 91034. |
A catalyst increases rate of reaction by |
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Answer» DECREASING ENTHALPY. |
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| 91035. |
A catalyst increase rate of reaction by |
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Answer» decrease enthalpy. |
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| 91036. |
A catalyst in the finely divided from is most effective because : |
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Answer» Less surface area is available |
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| 91037. |
A catalyst has no effect on |
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Answer» RATE of FORWARD reaction |
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| 91038. |
A catalyst in a chemical reaction does not change |
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Answer» Average ENERGY of reactants or products |
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| 91039. |
A catalyst for reversible reaction is a substance that : |
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Answer» Supplies ENERGY to the reaction |
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| 91040. |
A catalyst do not change : |
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Answer» GIBBS ENERGY of REACTION |
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| 91041. |
A catalyst always increases the rate of reaction. |
| Answer» | |
| 91042. |
A catalyst alters the rate of a reaction by leading of increasing the energy of activation, In Heterogeneus catalysis adrosption mechanism occurs and Hemogeneus. Catalysis intermediate formation occurs. In auto catalysis one of the products acts on catalyst. AsH_3 to As + 3H_2. The reaction is auto catalysed. Which graph is correct for it? |
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Answer»
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| 91043. |
A catalyst alters the rate of a reaction by leading of increasing the energy of activation, In Heterogeneus catalysis adrosption mechanism occurs and Hemogeneus. Catalysis intermediate formation occurs. In auto catalysis one of the products acts on catalyst. 2SO_2 + O_(2) overset(NO(g))(rarr)2SO_3. This reaction is carried out through formation of ----- intermediate. |
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Answer» `N_2O` `NO_2 + SO_2 to SO_3 + NO` INTERMEDIATE is `NO_2` |
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| 91044. |
A catalyst alters the rate of a reaction by leading of increasing the energy of activation, In Heterogeneus catalysis adrosption mechanism occurs and Hemogeneus. Catalysis intermediate formation occurs. In auto catalysis one of the products acts on catalyst. The DeltaH of a reaction A + B to C is d-20 KJ mol^(-1). When a catalyst is used. What is DeltaH for the reaction without catalyst (magnitude) |
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Answer» `lt 20 KJ` |
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| 91045. |
A catalyst accelerates the reaction, because |
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Answer» it brings the reactants closer |
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| 91046. |
A catalyst : |
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Answer» Increases the average kinetic energy of reacting molecules |
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| 91047. |
A catalyst: |
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Answer» INCREASES the AVERAGE kinetic ENERGY of reacting molecules. |
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| 91048. |
(A) : Cassiterite mineral is concentrated by electromagnetic method (R): Tinstone is non-magnetic and impurity wolframite is magnetic |
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Answer» Both A & R are true, R is the correct EXPLANATION of A |
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| 91049. |
(A) Cassiterite mineral is concentrated byelectromagnetic method (R) Tinstoneis non-magnetic and impurity wolframite is magnetic |
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Answer» Both (A) and (R) are true and (R) is the correct explanation of (A) |
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| 91050. |
A Carnot engine operates between temperatures 600 K and 390 K. Ir absorbs 120 cal of heat from the source. Calculate eta and the heat rejected to the sink. |
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Answer» SOLUTION :We have `eta=(T_(2)-T_(1))/(T_(2))=(600-390)/(600)=0.25` or `25%` Now, again we have, `eta=(W)/(q_(2))=(q_(2)-q_(1))/(q_(2))` where `q_(2)` is the HEAT absorbed by the system from the source and `q_(1)` is the heat rejected to the sink. `:.(120-q_(1))/(120)=0.25` `:.q_(1)=90` cal |
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