94420 + Interview Questions in Chemistry in Class 12

1.	Statement-1 : If an electron is located within the range of 0.1 Å then the uncertainly in velocity is approximately 6xx10^6 m//s Statement-2 : Trajectory (path of motion) of above electron can be defined. [h=6.6xx10^(-34), m_e=9.1xx10^(-31) kg]
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-1 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1 Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Solution :`mDeltav Deltax=h/(4PI)implies Deltav=(6.62xx10^(-34))/(9.1xx10^(-31)xx4xx3.14xx10^(-11))=6xx10^6 m//s` as uncertainly in velocity is very high so we cannot define the TRAJECTORY of an ELECTRON.

Discussion

2.	Statement-1 : If on mixing the two liquids, the solution becomes hot, it implies that it shows negative deviation from Raoult's law. Statement-2. Solution which show negative deviation are accompained by decrease in volume.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a correct explanation of Statement-1. Statement-1 is True, Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :Correct explanation. In case of SOLUTIONS SHOWING negative deviation, the forces of INTERACTION between the components are stronger than those in the pure components.

Discussion

3.	Statement-1: Hydroxides of group-2 are less soluble in water than hydroxides of group-1. Statement-2: CaF_(2) is least soluble in among other fluoride of group-2. Statement-3: Li gives red coloured flame.
Answer» TTF TTT FFF TFT Answer :B

Discussion

4.	Statement - 1 : ICl on hydrolysis gies HI and HOCl. Statement - 2 : Water can attack iodine more readily.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is a correct explanation for Statement-1. Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for Statement-1 Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. SOLUTION :Correct statement-1. ICI on hydrolysis GIVES HCL and HOI.

Discussion

5.	Statement 1 : Hydrogen bomb involves not only fusion but also fission reactions to start the fusion whereas atom bomb involves only fission. Statement 2 : Though energy liberated per fusion is smaller than energy liberated per fission, yet hydrogen bomb is more powerful than atom bomb.
Answer» STATEMENT 1 is true, statement 2 is true , statement 2 is a correct EXPLANATION for statement 2 Statement 1 is true, Statement 2 is true, statement 2 is not a correct explanation for statement 2 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :Masses PER atom of deuterium and tritium are much SMALLER than that of URANIUM.

Discussion

6.	Statement-1: Heat of solution is positive when Na_(2)SO_(4)10H_(2)O is dissolved in water bu it is negative when anhydrous CuSO_(4) is dissolved in water. Statement-2: Molar masses of Na_(2)SO_(4)10H_(2)O and CuSO_(4) are different.
Answer» Statement-1 is true, statement-2 is true, statement-2 is a CORRECT explanation for statement-1 Statement-1 is true, statement-2 is true, statement-2 is not a correct EXPLNATION for statement-1 Statement-1 is true, statement-2 is FALSE. Statement-1 is false, statement-2 is true. Answer :C

Discussion

7.	Statement-1 . HDPE is a branched chain polymer. Statement-2. it is prepared by coordination polymerization.
Answer» STATEMENT -1 is TRUE , Statement -2 is True , Statement-2 is a correct explanation for Statement-1. Statement-1 is True , Statement-2is True , Statement-2 is not a correct explanation for Statement-1. Statement-1 is True , Statement-2 is FALSE. Statement-1 is False , Statement-2 is True. Solution :Correct statement-1 : HDPE is a linear polymer.

Discussion

8.	Statement 1 : H_(2)SO_(4), HCl and HNO_(3) are all equally strong in water but not equally strong in acetic acid. Statement 2 : H_(2)O gives H^(+) as well as OH^(-) ions, but CH_(3)COOH gives only H^(+) and no OH^(-) ions.
Answer» STATEMENT 1 is true, statement 2 is true , statement 2 is correct explanation for statement 1 Statement 1 is true, statement 2 is true , statement 2 is not a correct explanation for statement 1 Statement 1 is true, statement 2 is FALSE Statement 1 is false, statement 2 is true Solution :`H_(2)SO_(4), HCl` and `HNO_(3)` DISSOCIATE to different extent in acetic acid because acetic acid is a poor proton acceptor and HENCE acts as a differentiating SOLVENT.

Discussion

9.	Statement-1 :Graphite can be converted into diamond by application of very high pressure and temperature. Using a suitable catalyst. Statement-2: Graphite is thermodynamically more stable and less dense than diamond.
Answer» <P>Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct explanation for Statement-1 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1 Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Solution :`C_(("GRAPHITE"))hArrC_(("DIAMOND"))`(at high T and high P) (It is a fact)

Discussion

10.	Statement-1: Glucose is in pyranose form and has free anomeric hydroxyl group Statement-1: In sucrose, glucose is in pyranose form and fructose is in furanose form.
Answer» Both I and II are TRUE I is true, but II is FALSE I is false, but II is true Both I and II are false ANSWER :A

Discussion

11.	Statement -1 Glucose gives a reddish brown precipitate with Fehling's solution. Statement -2 : Reaction of glucose with Fehling's solution gives CuO and gluconic acid.
Answer» STATEMENT -1 is True , Statement -2 is True, Statement -2 is a CORRECT explanation of Statement -1 Statement -1 is True , Statement -2 is True, Statement -2 is not a correct explanation for Statement -1 Statement -1 is True , Statement -2 is False Statement -1 is False, Statement -2 is True. Solution :Correct Statement -2 . The reaction of glucose with FEHLING's sloution gives `Cu_(2)O` and gluconic ACID.

Discussion

12.	STATEMENT-1: Gold is recovered from its solution containing aurocyanide complex by adding zinc dust.and STATEMENT-2: Zinc is more electropositive than gold
Answer» STATEMENT - 1 is True, STATEMENT-2 is True, STATEMENT -2 is CORRECT EXPLANATION for STATEMENT-1 STATEMENT - 1 is True, STATEMENT-2 is True, STATEMENT -2 is NOT a correct explanation for STATEMENT-1 STATEMENT - 1 is True, STATEMENT-2 is FALSE STATEMENT - 1 is False, STATEMENT-2 is True Answer :A

Discussion

13.	The questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses : Assertion : Galvanised iron does not rust . Reason : Zinc has a more negative electrode potential than iron .
Answer» ANSWER :A

Discussion

14.	Statement -1: Fructose reduces Fehling's solution and Tollen's reagent. Statement - 2: Fructose does not contain any aldehyde group.
Answer» Statement -1 is True , Statement -2 is True, Statement -2 is a correct explanation of Statement -2 Statement -1 is True , Statement -2 is True, Statement -2 is not a correct explanation for Statement -2 Statement -1 is True , Statement -2 is False Statement -1 is False, Statement -2 is True. Solution :Correct Explanation. Fructose contains the `alpha`-ketol GROUP i.e.,`-COCH_2OH` which gets CONVERTED into the `alpha`-aldol group , i.e., `-CHOHCHO` group under basic condition of the reaction (Lobry de Bruyn van Ekenstein rearrangement ) and HENCE reudces Fehling's solution and TOLLENS' reagent.

Discussion

15.	STATEMENT - 1 :gives turbidity with ZnCl_(2)//HCl in 5 minutes. STATEMENT - 2 : 2^(@) alcohol usually gives turbidily in 5 minutes.
Answer» STATEMENT - 1 is true, Statement - 2 is TURE, Statement-2 is a CORRECT explanation for Statement-1. Statement -1 is True , Statement -2 is FALSE. Statement -1 is False , Statement -2 is True. Statement -1 and Statement -2 both are False. Solution :N//A

Discussion

16.	Statement 1: Friedel-Crafts reaction of benzene with n-propyl chloride gives isopropylbenzene. Statement 2:Benzene undergoes electrophile substitution readily
Answer» STATEMENT 1 is true , statement 2 is true , statement 2 is a correct EXPLANATION for statement 1 Statement 1 is true , statement 2 is true , statement 2 is nota correct explanation for statement 1 Statement 1 is true , statement 2 is false Statement 1 is false , statement 2 is true Solution :The INITIALLY formed n-propyl cation first undergoes rearrangement by 1,2-hybride shift to form the more stable isopropyl cation which then attacks the benzene ring to form isopropylbenzene

Discussion

17.	STATEMENT-1 : Fraction of total molecules having energy equal to or greater than activation energy =K//A=e^(-Ea//RT) and STATEMENT-2 : Activation energy of a chemical reaction is always constant at a given temperature.
Answer» STATEMENT-1 is TRUE, STATEMENT-2 is True, STATEMENT-2 is CORRECT EXPLANATION for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT acorrect explanation for STATEMENT-1 STATEMENT-1 True, STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True Answer :C

Discussion

18.	Statement-1: Formaldehyde is more reactive than benzaldehyde for nucleophilic addition reaction. Statement-2: Formaldehyde is more stable than benzaldehyde.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for statement-1 statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1 statement-1 is true, statement-2 is FALSE statement-1 is false, statement-2 is true Answer :C

Discussion

19.	STATEMENT-1: Formaldehyde is more reactive than benzaldehyde for nucleophilic additior reaction. and STATEMENT-2: Formaldehyde is more stable than benzaldehyde.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Answer :C

Discussion

20.	Statement-1 : For zero order kinetic t_(1//2) is independent of initial concentration. Statement-2 : For zero order kinetic in equal time equal amount of reactant will decompose. Statement-3 : Rate I^(st) order kinetic in equal time equal percentage of reactant will decompose. Statement-4 : Rate law expression of reaction may be contains concentration of reactant concentration of product and even concentration of catalyst.
Answer» TFFF FTTT FTTF TFFT Answer :B

Discussion

21.	Statement-1: For the reaction 2A +B to C,the rate of disappearance of A is twice therate of disappearance ofA is twice the rate of disappearance of B. Statement-2: For the reaction : 2A +B to C Rate of reactions is (d[C])/(dt)
Answer» Statement-1 is TRUE, statement-2 is True, Statement-2 is a CORRECT explantion for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOTA correct explanation for Statement-1 Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Answer :b

Discussion

22.	Statement -1: For the Daniell cell, Zn \| Zn^(2+) \|\| Cu^(2+) \| Cu with E_("cell") = 1.1 volt, the application of opposite potential greater than 1.1 V results into flow of electrons from cathode to anode. and Statement -2: Zn is deposited at cathode.
Answer» STATEMENT -1 is TRUE, Statement -2 is true, Statement -2 is correct explanation for statement -1. Statement-1 is true, statement -2 is true , statement -2 is not a correct explanation for statement-10 Statement -1 is true, statement -2 is false Statement-1 is false, Statement-2 is true. ANSWER :B

Discussion

23.	Statement-1: For the given two compounds-I is more acidic than compounds-II ltBrgt and Statement-2: Due to presence of -CH_(3) group at ortho positions to -NO_(2) the plane of -NO_(2) deviates, w.r.t plane of ring.
Answer» STATEMENT-1 I TRUE, statement-2 is true, statement-2 is a CORRECT EXPLANATION for statement-1 Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1. Statement-1 is true, statement-2 is FALSE. statement-1 is false, statement, statement-2 is true. Answer :D

Discussion

24.	STATEMENT 1 : For the concentration cell Zn(s)\|Zn_(C_(2))^(+2)(aq)\|Zn for spontaneous cell reaction C_(1)ltC_(2) and STATEMENT 2 For concentration cell E_(cell)=(RT)/(nF)log_(e)(C_(2))/(C_(1)) for spontaneous rection E_(cell)=+verarrc_(2)gtc_(1)
Answer» Statement 1 is TURE , Statement 2 is TRUE Statement 2 is correct explanation for Statement 3 Statement 1 is true Statement 2 is ture Statement 2 is NOT a correct explantion for Statement 3 Statement 1 is true statement 2 is ture Statement 1 is FALSE Statement 2 is true Answer :A

Discussion

25.	Statement: 1 For the change occuring during roasting of sphalerite, the entropy change is negtive Statement-2. Two different compounds of Zine are formed during roasting
Answer» Both I and II are correct and II is correct explanation of I Both in and II are correct and li is not correct explanation of l is true but ll is false is false but II is true Solution :Statement-I`ZnS_((s))+3O_(2(g)) to ZnO_((s))+2SO_(2(g))` (correct) `:.` Number of moles of gases PRODUCTS decreases so `Deltas=-ve` Statement-II : During roasting TWO DIFFERENT compounds of Zn are formed.

Discussion

26.	Statement -1 For PCI_5 (g) hArr PCI-3 (g) +CI_2(g) .If more CI_2 is addedthe equilibrium will shift in backward direction hence equilibrium constant will decreases. and Statement -2 : Addition of inert gas to the equilibrium mixture at constant volume , does not alter the equilibrium .
Answer» STATEMENT -1 is true, Statement -2 is true , Statement-2 is correct explanation for Statement -2 Statement-1 is True, Statement-2 is true, Statement-2 ISNOT a correct explanation for Statement -2 Statement-1 is true, Statement -2 is false Statement -1 is false, Statement -2 is true Answer :C

Discussion

27.	Statement 1 : For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. Statemet 2 : At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.
Answer» Statement 1 is TRUE, statement-2 is true, statement 2 is a correct explanation for statement 3 Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 3 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :At equilibrium `DeltaG` (Gibbs energy) = 0 but `DeltaG^(@)` (standard Gibbs energy) `NE 0` As `DeltaG` is `II^(nd)` law of thermodynamics which concludes that total HEAT can NEVER CONVERTED into equivalent amount of work.

Discussion

28.	Statement 1: For extraction of copper, malachite is calcunited but chalcocite is roasted Statement 2: Both roasting and calisation conert all the ares into their oxides
Answer» Both I and II are correct and II is correct explanation of I Both in and II are correct and li is not correct explanation of l is TRUE but ll is false is false but II is true Solution :Statement-I: Malachite `(CuCO_(3).Cu(OH)_(2))` has VOLATILE impurity. So it is calcinated. Where as chalcocite (sulphide ore of copper) is roasted. Statement. IL : During roasting only sulphide ores are converted into oxides.

Discussion

29.	STATEMENT 1: For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. STATEMENT 2: At constant temperature and pressure, chemical reactions are spontaneous in the direction Gibbs energy.
Answer» STATEMENT -1 is true, Statement -2 is true, Statement -2 is correct explanation for statement -1 Statement -1 is true, Statement-2 is True, Statement-2 is not a correct explanation for Statement -1 Statement-1 is true, Statement -2 is FALSE. Statement -1 is False, Statement -2 is True. SOLUTION :At EQUILIBRIUM `DeltaG =0, DeltaG^(@)` of a reaction may or may not be zero.

Discussion

30.	Statement-1: For A+2BtoC(rate =K[A]^(1)[B]^(0)), the half life time of reaction is only defined when concentration of A and B are in stoichometric ratio Statement-2 :For above reaction, half life of reaction is directly proportional to concentration of A and not to concentration of B due to its zero order.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-1 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-2 Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :NA

Discussion

31.	Statement -1: For every chmical reaction at equilibrium , standard Gidds energy of reaction is zero Statement-2: At constant temperature and pressure , chemical reactions are spontaneiousin the direction of decreasing gibbs energy.
Answer» STATEMENT 1 is true, statement 2 is true, statement 2 is CORRECT explanation for statement 1. Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 1. Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :At equilibrium, `DeltaG=0`, but `DeltaG^(@)` MAY or may not be ZERO

Discussion

32.	STATEMENT-1 : For each 1^(@)C rise in temperature rate constant is nearly doubled. and STATEMENT -2 : Energy wise distribution of molecule in a gas is an exponential function of temperature.
Answer» STATEMENT-1 is TRUE, STATEMENT-2 is True, STATEMENT-2 is CORRECT EXPLANATION for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True Answer :B

Discussion

33.	Statement-1 For A+2B rarr C(rate =k[A]^(1)[B]^(0)) the half life time of reaction is only defined when conc. Of A and B are in stoichiometric ratio. Statement -2: For above given order half life of reaction is directlyproportional to conc. of A and B not conc. of B due to its zero order.
Answer» Statement-1 is True, statement-2 is True, Statement-2 is a correct explantion for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOTA correct EXPLANATION for Statement-1 Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Answer :C

Discussion

34.	Statement-1.For arsenic sulphide sol, BaCl_(2) has higher coagulation value than NaCl. Statement-2. Higher the valencey of the oppositely charged ion of the electrolyte added, higher is the coagulating power of the electrolyte.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct explanation of Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation of Statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is Ture. Solution :Correct Statement-1, For-vely CHARGED `As_(2)S_(3)` sol, `BaCl_(2)` has lower COAGULATION value (or HIGHER coagulating POWER) than NaCl.

Discussion

35.	Assertion (A) : For: aA+bB rarr Product. The order of reaction is equal to (a+b). Reason (R ): Rate of reaction =k[A]^(a)[B]^(b).
Answer» Solution :RATE of reaction = `K [A]^(a) [B]^(b) therefore` Order of reaction = a + b .

Discussion

36.	Statement-1: [Fe(H_(2)O)_(5)NO]SO_(4) is paramagnetic. Statement-2: The Fe in [Fe(H_(2)O)_(5)NO]SO_(4) has three unpaired electrons.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Answer :A

Discussion

37.	STATEMENT-1: First ionization enthalpy of Be is greater than that of B. and STATEMENT-2: 2p orbital is lower in energy than 2s, orbital.
Answer» STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is a CORRECT EXPLANATION for STATEMENT-1. STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 ia NOTa correct explanation for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is False, STATEMENT-1 is False, STATEMENT-2 IS True, ANSWER :C

Discussion

38.	Statement 1: Fehling solution oxidises acetaldehyde to acetic acid but not benzaldehyde to benzoic acid. Statement 2: The C-H bond of CHO group in benzaldehyde is stronger than in acetaldehyde
Answer» Statement-1 is TRUE, statement-2 is true,statement-2 is a CORRECT EXPLANATION for statement-1 Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1 Statement-1 is true, statement-2 is FALSE Statement-1 is false, statement-2 is true Answer :A

Discussion

39.	Statement-1. [Fe(H_(2)O)_(5)NO]SO_(4) is paramagnetic. Statement-2. The Fe in [Fe(H_(2)O)_(5)NO]SO_(4) has three unpaired electrons.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is a correct explanation for Statement-6 Statement-1 is True, Statement is 2 is True , Statement-2 is NOT a correct explanation for Statement-6 Statement-1 is True, Statement-2 is False Statement-1 is False, Statement-2 is True Solution :Inthe compound `[Fe(H_(2)O)_(5)NO]SO_(4)`, NO is present as `NO^(+)`. Hence, OXIDATION state of Fe is `x+5xx0+1=+2` or x=+1. In fact, odd `e^(-)` on N is transferred from NO to Fe, CHANGING NO to `NO^(+)` and `Fe^(2+)` to `Fe^(+)`). E.C. of `Fe^(+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)4s^(1)` The electron present in 4s shifts to 3d giving `3d^(7)` configuration, i.e., `H_(2)O` and `NO^(+)` both are weak field ligands and cannot cause pairing of 3d electrons. Thus, there are 3 unpaired electrons and hybridisation is `sp^(3)d^(2)` (an outer ORBITAL complex).

Discussion

40.	Statement-1: First step is always the rate determine step in the path of the reaction. Statement-2: Study of kinetics of a reaction can report events only up to the rate determining step, not beyond that.
Answer» If both the statement are TRUE and Statement -2 is the correct explanation of Statement-1: If both the statement are TRUE but Statement-2 is not the correct explanation of Statement-1 If statement-1 is TRUE and Statement-2 is FALSE If statement -1 is FALSE and Statement-2 is TRUE Solution :Slowest STEP is always the rate DETERMINING step in the path reaction. It could be first, second, THIRD,.....and so on.

Discussion

41.	Statement 1: F atom has aless negative electron affinity than Cl atom statement 2: Additional electrons are repelled more effectively by 3p electrons in Cl atom than by electrons in F atoms
Answer» Statement 1 is true, statement 2 is true, statement 2 si a correct EXPLANATION for statement 5 Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 5 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :F has slightly LESS electron affinity than CHLORINE because F has verysmall atomic size (only TWO SHELLS). Hence results in less evolution of energy in the formation of `F^(-)` ion. Statement 1 correct but statement 2 incorrect.

Discussion

42.	STATEMENT-1: Faraday is the charge that liberates 1 eq. of metal of cathode. and STATEMENT-2: Passage of 1 Faraday charge through aq. MgCl_(2) liberates 12g Mg at cathode.
Answer» STATEMENT-1 is TRUE, STATEMENT-2 is True, STATEMENT -2 is CORRECT explanation for STATEMENT-1 STATEMENT 1 is True, STATEMENT-2 Is True, STATEMENT -2 is NOT a correct explanation for STATEMENT-1 STATEMENT - 1 is True, STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True Answer :A

Discussion

43.	Statement-1: [Fe(CN)_(6)]^(3-) ion shows magnetic moment corresponding to two unpaired electrons. Statement-2: It has d^(2)sp^(3)type hybridisation.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Answer :D

Discussion

44.	Statement-1: [FeCl_(2)(SCN)_(2)]^(2-), (high spin complex) can exist as diastereoisomers. Statement-2: In tetrahedral geometry, all positions are identical to each other.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is a CORRECT EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Answer :D

Discussion

45.	Statement 1: Ethyl chloride is more reactive than vinyl chloride towards nucleophilic substitution reaction Statement 2: In vinyl chloride , the Cl is bonded to sp-hybridized carbon of an alkene.
Answer» Statement 1 is true, statement 2 is true, statement 2 is a correct explanation for statement 3 Statement 1 is true , statement 2 is true, statement 2 is not a correct explanation for statement 3 Statement1 is true, statement 2 is false Statement 1 is true, statement 2 is true Solution :In vinyl chloride , the Cl is BONDED to `SP^(2)` hybridized CARBON of an alkene.

Discussion

46.	Statement-1: Extraction of gold from its native ore involves leaching the metal wih dilute solution of NaCN in presence of air. Statement-2:This is an oxidation reaction and leads to the formation of a soluble complex.
Answer» STATEMENT -1 is TRUE, Statement-2 are true and Statement-2 is the correct EXPLANATION of Statement -1 Statement -1 is true, Statement-2 are true and Statement-2 is not a correct explanation of Statement -1 Statement-1 is true but Statement -2 is false Statement-1 is false but Statement -2 is true Answer :a

Discussion

47.	Statement 1: Esters on reduction with LiAlH_(4) give alcohols while amides give primary amines. Statement 2: Alkoxide ion is a better leaving group than amide ion.
Answer» Statement-1 is TRUE, statement-2 is true,statement-2 is a CORRECT EXPLANATION for statement-1 Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1 Statement-1 is true, statement-2 is FALSE Statement-1 is false, statement-2 is true Answer :A

Discussion

48.	Statement-1: Equimolar mixture of conc. HCl and anhydrous zinc chlorie is called Lucas reagent. Statement-2: Lucas reagent can be used to distinguish between methanol and ethanol.
Answer» Statement-1 is TRUE, statement-2 is true, statement-2 is a correct explanation for statement-1. Statement-1 is true,s tatement-2 is true, statement-2 is not a correct explanation for statement-1. Statement-1 is true, statement-2 is false. Statement-1 is false, statement-2 is true. Solution :Correct statement-2: both METHANOL and ethanol are `1^(@)` alcohols annd hence cannot be DISTINGUISHED by Lucas reagent.

Discussion

49.	Statement 1: Equivalent conductance of all electrolytes decreases with increasing concentration. Statement 2: Lesser number of ions are available per gram equivalent at higher concentration.
Answer» Statement -1 is TRUE, Statement -2 is true, Statement -2 is correct EXPLANATION for statement -1. Statement-1 is true, statement -2 is true , statement -2 is not a correct explanation for statement-7 Statement -1 is true, statement -2 is false Statement-1 is false, Statement-2 is true. ANSWER :C

Discussion

50.	STATEMENT-1 : Environment of U^(235) from a mixture containing more abundant U^(238) is based on diffusion of UF_(6) and STATEMENT -2 : UF_(6) is gaseous compound under ordinary conditions.
Answer» STATEMENT-1 is TRUE, STATEMENT-2 is True, STATEMENT-2 is CORRECT EXPLANATION for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True Answer :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Statement-1 : If an electron is located within the range of 0.1 Å then the uncertainly in velocity is approximately 6xx10^6 m//s Statement-2 : Trajectory (path of motion) of above electron can be defined. [h=6.6xx10^(-34), m_e=9.1xx10^(-31) kg]

Statement-1 : If on mixing the two liquids, the solution becomes hot, it implies that it shows negative deviation from Raoult's law. Statement-2. Solution which show negative deviation are accompained by decrease in volume.

Statement-1: Hydroxides of group-2 are less soluble in water than hydroxides of group-1. Statement-2: CaF_(2) is least soluble in among other fluoride of group-2. Statement-3: Li gives red coloured flame.

Statement - 1 : ICl on hydrolysis gies HI and HOCl. Statement - 2 : Water can attack iodine more readily.

Statement 1 : Hydrogen bomb involves not only fusion but also fission reactions to start the fusion whereas atom bomb involves only fission. Statement 2 : Though energy liberated per fusion is smaller than energy liberated per fission, yet hydrogen bomb is more powerful than atom bomb.

Statement-1: Heat of solution is positive when Na_(2)SO_(4)*10H_(2)O is dissolved in water bu it is negative when anhydrous CuSO_(4) is dissolved in water. Statement-2: Molar masses of Na_(2)SO_(4)*10H_(2)O and CuSO_(4) are different.

Statement-1 . HDPE is a branched chain polymer. Statement-2. it is prepared by coordination polymerization.

Statement 1 : H_(2)SO_(4), HCl and HNO_(3) are all equally strong in water but not equally strong in acetic acid. Statement 2 : H_(2)O gives H^(+) as well as OH^(-) ions, but CH_(3)COOH gives only H^(+) and no OH^(-) ions.

Statement-1 :Graphite can be converted into diamond by application of very high pressure and temperature. Using a suitable catalyst. Statement-2: Graphite is thermodynamically more stable and less dense than diamond.

Statement-1: Glucose is in pyranose form and has free anomeric hydroxyl group Statement-1: In sucrose, glucose is in pyranose form and fructose is in furanose form.

Statement -1 Glucose gives a reddish brown precipitate with Fehling's solution. Statement -2 : Reaction of glucose with Fehling's solution gives CuO and gluconic acid.

STATEMENT-1: Gold is recovered from its solution containing aurocyanide complex by adding zinc dust.and STATEMENT-2: Zinc is more electropositive than gold

The questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses : Assertion : Galvanised iron does not rust . Reason : Zinc has a more negative electrode potential than iron .

Statement -1: Fructose reduces Fehling's solution and Tollen's reagent. Statement - 2: Fructose does not contain any aldehyde group.

STATEMENT - 1 :gives turbidity with ZnCl_(2)//HCl in 5 minutes. STATEMENT - 2 : 2^(@) alcohol usually gives turbidily in 5 minutes.

Statement 1: Friedel-Crafts reaction of benzene with n-propyl chloride gives isopropylbenzene. Statement 2:Benzene undergoes electrophile substitution readily

STATEMENT-1 : Fraction of total molecules having energy equal to or greater than activation energy =K//A=e^(-Ea//RT) and STATEMENT-2 : Activation energy of a chemical reaction is always constant at a given temperature.

Statement-1: Formaldehyde is more reactive than benzaldehyde for nucleophilic addition reaction. Statement-2: Formaldehyde is more stable than benzaldehyde.

STATEMENT-1: Formaldehyde is more reactive than benzaldehyde for nucleophilic additior reaction. and STATEMENT-2: Formaldehyde is more stable than benzaldehyde.

Statement-1: For the reaction 2A +B to C,the rate of disappearance of A is twice therate of disappearance ofA is twice the rate of disappearance of B. Statement-2: For the reaction : 2A +B to C Rate of reactions is (d[C])/(dt)

Statement -1: For the Daniell cell, Zn | Zn^(2+) || Cu^(2+) | Cu with E_("cell") = 1.1 volt, the application of opposite potential greater than 1.1 V results into flow of electrons from cathode to anode. and Statement -2: Zn is deposited at cathode.

Statement-1: For the given two compounds-I is more acidic than compounds-II ltBrgt and Statement-2: Due to presence of -CH_(3) group at ortho positions to -NO_(2) the plane of -NO_(2) deviates, w.r.t plane of ring.

STATEMENT 1 : For the concentration cell Zn(s)|Zn_(C_(2))^(+2)(aq)|Zn for spontaneous cell reaction C_(1)ltC_(2) and STATEMENT 2 For concentration cell E_(cell)=(RT)/(nF)log_(e)(C_(2))/(C_(1)) for spontaneous rection E_(cell)=+verarrc_(2)gtc_(1)

Statement: 1 For the change occuring during roasting of sphalerite, the entropy change is negtive Statement-2. Two different compounds of Zine are formed during roasting

Statement -1 For PCI_5 (g) hArr PCI-3 (g) +CI_2(g) .If more CI_2 is addedthe equilibrium will shift in backward direction hence equilibrium constant will decreases. and Statement -2 : Addition of inert gas to the equilibrium mixture at constant volume , does not alter the equilibrium .

Statement 1 : For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. Statemet 2 : At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

Statement 1: For extraction of copper, malachite is calcunited but chalcocite is roasted Statement 2: Both roasting and calisation conert all the ares into their oxides

STATEMENT 1: For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. STATEMENT 2: At constant temperature and pressure, chemical reactions are spontaneous in the direction Gibbs energy.

Statement -1: For every chmical reaction at equilibrium , standard Gidds energy of reaction is zero Statement-2: At constant temperature and pressure , chemical reactions are spontaneiousin the direction of decreasing gibbs energy.

STATEMENT-1 : For each 1^(@)C rise in temperature rate constant is nearly doubled. and STATEMENT -2 : Energy wise distribution of molecule in a gas is an exponential function of temperature.

Statement-1 For A+2B rarr C(rate =k[A]^(1)[B]^(0)) the half life time of reaction is only defined when conc. Of A and B are in stoichiometric ratio. Statement -2: For above given order half life of reaction is directlyproportional to conc. of A and B not conc. of B due to its zero order.

Statement-1.For arsenic sulphide sol, BaCl_(2) has higher coagulation value than NaCl. Statement-2. Higher the valencey of the oppositely charged ion of the electrolyte added, higher is the coagulating power of the electrolyte.

Assertion (A) : For: aA+bB rarr Product. The order of reaction is equal to (a+b). Reason (R ): Rate of reaction =k[A]^(a)[B]^(b).

Statement-1: [Fe(H_(2)O)_(5)NO]SO_(4) is paramagnetic. Statement-2: The Fe in [Fe(H_(2)O)_(5)NO]SO_(4) has three unpaired electrons.

STATEMENT-1: First ionization enthalpy of Be is greater than that of B. and STATEMENT-2: 2p orbital is lower in energy than 2s, orbital.

Statement 1: Fehling solution oxidises acetaldehyde to acetic acid but not benzaldehyde to benzoic acid. Statement 2: The C-H bond of CHO group in benzaldehyde is stronger than in acetaldehyde

Statement-1. [Fe(H_(2)O)_(5)NO]SO_(4) is paramagnetic. Statement-2. The Fe in [Fe(H_(2)O)_(5)NO]SO_(4) has three unpaired electrons.

Statement-1: First step is always the rate determine step in the path of the reaction. Statement-2: Study of kinetics of a reaction can report events only up to the rate determining step, not beyond that.

Statement 1: F atom has aless negative electron affinity than Cl atom statement 2: Additional electrons are repelled more effectively by 3p electrons in Cl atom than by electrons in F atoms

STATEMENT-1: Faraday is the charge that liberates 1 eq. of metal of cathode. and STATEMENT-2: Passage of 1 Faraday charge through aq. MgCl_(2) liberates 12g Mg at cathode.

Statement-1: [Fe(CN)_(6)]^(3-) ion shows magnetic moment corresponding to two unpaired electrons. Statement-2: It has d^(2)sp^(3)type hybridisation.

Statement-1: [FeCl_(2)(SCN)_(2)]^(2-), (high spin complex) can exist as diastereoisomers. Statement-2: In tetrahedral geometry, all positions are identical to each other.

Statement 1: Ethyl chloride is more reactive than vinyl chloride towards nucleophilic substitution reaction Statement 2: In vinyl chloride , the Cl is bonded to sp-hybridized carbon of an alkene.

Statement-1: Extraction of gold from its native ore involves leaching the metal wih dilute solution of NaCN in presence of air. Statement-2:This is an oxidation reaction and leads to the formation of a soluble complex.

Statement 1: Esters on reduction with LiAlH_(4) give alcohols while amides give primary amines. Statement 2: Alkoxide ion is a better leaving group than amide ion.

Statement-1: Equimolar mixture of conc. HCl and anhydrous zinc chlorie is called Lucas reagent. Statement-2: Lucas reagent can be used to distinguish between methanol and ethanol.

Statement 1: Equivalent conductance of all electrolytes decreases with increasing concentration. Statement 2: Lesser number of ions are available per gram equivalent at higher concentration.

STATEMENT-1 : Environment of U^(235) from a mixture containing more abundant U^(238) is based on diffusion of UF_(6) and STATEMENT -2 : UF_(6) is gaseous compound under ordinary conditions.

Statement-1: Heat of solution is positive when Na_(2)SO_(4)10H_(2)O is dissolved in water bu it is negative when anhydrous CuSO_(4) is dissolved in water. Statement-2: Molar masses of Na_(2)SO_(4)10H_(2)O and CuSO_(4) are different.