94420 + Interview Questions in Chemistry in Class 12

1.	Assertion: 1-Butene on reaction with HBr in the presence of a peroxide produces 1-bromo-butane Reason: It involves the free radical mechanism.
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 :`UNDERSET"1-Butene"(CH_3-CH_2-CH=CH_2+Br_2)to underset"1,2-dibromobutane"(CH_2-underset"Br"underset"\|"oversetoversetH\|(C^dot)-CH_2Br)`

Discussion

2.	Statement -1: Zn^(+2) precipitated in the form of ZnS but not in the form Zn(NO_(3))_(2). And Statement -2: S^(-2) ion has high electron density w.r.t. NO_(3)^(-) ion.
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

3.	STATEMENT-1: Zinc does not show characteristic properties of transition metals. and. STATEMENT-2: In zinc outermost shell is completely filled.
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 :C

Discussion

4.	Statement -1: Zinc displaces copper from copper sulphate solution. and Statement 2: The E^(@) is Zn of - 0.76 volt and that of copper is +0.34 volt.
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-8 Statement -1 is true, statement -2 is FALSE Statement-1 is false, Statement-2 is true. ANSWER :A

Discussion

5.	Statement - 1 : Wolframite impurities are separated from cassiterite by electromagnetic separation. And Statement - 2 : Cassiterite being magnetic is attracted by the magnet and forms a separate heap.
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

6.	Statement-1: When the ligands are stronger, the distribution of six electrons of Co^(3+) ions is d_(xy)^(2),d_(yz)^(2)" and "d_(zx)^(2) Statement-2: t_(2g) orbitals corresponds to d_(xy),d_(yz)" and "d_(z^(2)).
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 :B

Discussion

7.	Statement-1: When acidified zinc sulphate solution is electrolysed between zinc electrodes, it is zinc that is deposited at the cathode and no H_(2) gas is evolved. Statement-2: The electrode potential of zinc is more negative than that of hydrogen as the overvoltage for the H_(2) evolution on zinc is quite large.
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, statemet-2 is FALSE Statement-1 is false, statement-2 is true Solution :Statement-2 is the correct explanation of statement-1

Discussion

8.	STATEMENT-1: Volume required for 0.1 M solution is in order V_(KMnO_(4)) lt V_(K_(2)Cr_(2)O_(7)) lt V_(H_(2)O_(2)) STATEMENT-2: The number of equivalents required will be in order H_(2)O_(2) gt KMnO_(4) gt K_(2)Cr_(2)O_(7) STATEMENT-3: The n_("factor") is in order n_(H_(2)O_(2)) lt n_(KMnO_(4)) lt n_(K_(2)Cr_(2)O_(7)
Answer» T T F T F T F F T F T F ANSWER :C

Discussion

9.	Statement-1: When 2 faraday of electricity is passed through 0.1 MH_(2)SO_(4)(aq),11.2 litre O_(2) evolved at STP. Statement-2: Molecular weight of oxygen is 32.
Answer» Solution :MOLE of `O_(2)xx4=2(H_(2)OtoO_92)+4H^(+)+4e^(-))` Mole of `O_(2)=0.5` VOLUME of `O_(2)` at `S.T.P=11.2Lt`.

Discussion

10.	STATEMENT-1: VO_(4)^(-3) is coloured due to charge transfer . STATEMENT-2: Colour due to charge transfer is highly intense colour STATEMENT-3: Fe may form Fe-Fe bond
Answer» FTF FTT TTF TTT Answer :4

Discussion

11.	Statement -1: Vinylidene chloride forms isotactic. Statement -2: Vinylidene chloride contains chiral carbon atoms
Answer» Statement 1 is true, statement-2 is true , statmenent -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 :Vinyl chloride does not form ISOTACTIC, syndiotactic and atactic -polymers. Vinylidene chloride does not CONTAIN chiral carbon ATOMS.

Discussion

12.	Statement-1: [V(CO)_(6)] cannot act as oxidising agent. Statement-2: It cannot be reduced by reducing agent.
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

13.	Statement-1. Vapour pressure of water is less than 1.013 bar at 373K. Statement-2. Water boils at 373 K as the vapour pressure at this temperature becomes equal to atmosphere pressure.
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 - 1. At 373 K, i.e., `100^(@)C`, the vapour presssure of water is equal to 1 ATMOSPHERE which is equal to 1.013 BAR.

Discussion

14.	Statement-1: Vapour density of CH_(4) is half of O_(2). Because Statement-2: 1.6 g of CH_(4) contains same number of electrons as 3.2 g of O_(2). Statement-2: Specific gravity is dimensionless quantity. Because Statement-2: Specific gravity. is relative density of a substance, measured with respect to density of water at 4^(@)C?
Answer» Statement-1 is TRUE, statement-2 is true, statement-2 is a CORRECT EXPLANANTION 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

15.	Statement-1: Unsymmetrical ketone reacts with HCN to give (dil) mixture of carbohydrine. Statement-2: Cyanide ion is amident nucleophile.
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 Answer :A

Discussion

16.	STATEMENT -1 :unlikethe gtC = Ogroupof aldehyesandketones,the gt C = OofR - overset(O)overset(\|\|)(C) - OH does not undergonucleophillicadditionreactions. andSTATEMENT- 2:Carboxylicacidsexistas dimers due tointermolecular hydrongen bonding .
Answer» STATEMENT - 1IS True, STATEMENT- 2 is True, , STATEMENT-2 , isa correct explanationfor STATEMENT- 1 . STATEMENT -1 is True, STATEMENT-2IS True , STATEMENT -2 is NOTa correctexplanationfor STATEMENT- 1 STATEMENT-1 isTrue,STATEMENT-2is False . STATEMENT -1is False , STATEMENT -2is True . ANSWER :C

Discussion

17.	Statement-1 : undergoes inversion in DMSO with hydroxide ion Statement-2 : The reaction proceeds by SN_(2) mechanism.
Answer» STATEMENT -I is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for Statement-6 Statement-1 is true, Statement-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 Answer :A

Discussion

18.	Statement-1. Under identical conditions, 1 L of O_(2) gas an 1 L of O_(3) gas contain the same number of oxygen atoms. Statement-2. 1 L of O_(2) and 1 L of O_(3) contain the same number of moles under identical conditions.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is the 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 :1 L of `O_(2)` and 1 L `O_(3)` contain the same number of moles and hence same number molecules but not ATOMS. No. of atoms in `O_(3)` will be 1.5 TIMES than that in `O_(2)`. Hence, statement-1 is false and statement-2 is true.

Discussion

19.	Statement-1 : Two reversible adiabats can never intersect. Statement-II : Efficiency of carnot engine cannot be one.
Answer» Statement-I is TRUE, statement-II is true and statement-II is CORRECT EXPLANATION for statement-I Statement-I is true, statement-II is true and statement-II is NOT the correct explanation for statement-I Statement-I is FALSE, statement-II is true. Statement-I is true, statement-II is false. Answer :A

Discussion

20.	Statement-1: Toxic metal ions are removed by the chelating ligands. Statement-2: Chelate complexes tend to be more stable.
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

21.	Statement-1: Triethylenetrtraamine is bidentate monoanion. Statement-2: Complex containing propylenediamine ligand shows ligand isoemrism.
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

22.	Statement-1 : Total number of moles in a closed system at new equilibrium is less than the old equilibrium if some amount of a substance is removed from a system. A(g)hArrB(g) equilibrium. Statement-2 : The number of moles of the substance which is removed, is partially compensated as the system reached to new equilibrium.
Answer» Statement-1 is TRUE, statement-2 is true and statement-2 is CORRECT EXPLANATION for statement-4 Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-4 Statement-I is FALSE, statement-2 is true. Statement-1 is true, statement-2 is false. Answer :B

Discussion

23.	Statement-1. To a solution of potassiumchromate, if a strong acid is added, it changes its colour from yellow to orange. Statement-2. The colour change is due to the change in the oxidation state of potassium chromate.
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 CORRECTEXPLANATION of Statement-1 Statement-1 is True, Statement-2 is FALSE Statement-1 is False, Statement-2is True Solution :Statement -2 is the correct explanation of statement-1 becauseon ADDING acid, yellow potassium chromate changes to orange coloured potassium dichromate.

Discussion

24.	Statement 1 : To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange. Statement 2 : The colour change is due to the oxidation of potassium chromate.
Answer» Statememt 1 is true, statement 2 is true , statement 2 is a correct EXPLANATION for statement 6 Statement 1 is true, statement 2 is true , statement 2 si not a correct explanation for statement 6 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is ture Solution :`overset("+6")underset("(YELLOW)")(2CrO_(4)^(2-))+2H^(+)rarrunderset("(Orange)")overset(+6)(Cr_(2))O_(7)^(2-)+H_(2)O` There is no CHANGE in OXIDATION state. So the explanation is wrong.

Discussion

25.	Statement -1: Time taken for the completion of 75% of a 1st order reaction is double that t_(1//2). Statement-2: Time taken for completion of any fraction of 1st order reaction is a constant value.
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

26.	Statement-1: [Ti(H_(2)O)_(6)]^(3+) is violet in colour while Ti^(3+) is colourless. Statement-2: Light correspondign to dnergy of blue-green region is absorbed by the complex to excite the electron from t_(2g) level to e_(g) level.
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

27.	Statement-1 : There is no change in enthalpy of an ideal gas during compression at constant pressure. Statement-II : Enthalpy of an ideal gas is a function of temperature .
Answer» Statement-I is TRUE, statement-II is true and statement-II is CORRECT EXPLANATION for statement-I Statement-I is true, statement-II is true and statement-II is NOT the correct explanation for statement-I Statement-I is FALSE, statement-II is true. Statement-I is true, statement-II is false. Answer :C

Discussion

28.	Statement-1 : There is no change in enthalpy of an ideal gas during compression at constant temperautre. Statement-II : Enthalpy of an ideal gas is a function of temperature and pressure.
Answer» Statement-I is TRUE, statement-II is true and statement-II is CORRECT EXPLANATION for statement-I Statement-I is true, statement-II is true and statement-II is NOT the correct explanation for statement-I Statement-I is FALSE, statement-II is true. Statement-I is true, statement-II is false. Answer :D

Discussion

29.	Statement 1 : There is a natural asymmetry between converting work to heat and converting heat to work. Statement 2 : No porcess is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.
Answer» Statement 1 is true, statement-2 is true, statement 2 is a correct explanation for statement 4 Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 4 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :Statement 2 is `II^(nd)` LAW of THERMODYNAMICS which concludes that total heat can NEVER converted into equilvalent amount of work.

Discussion

30.	Statement-1: The value of Delta_(0) for M^(3+) complexes are always much higher than value for M^(2+) complexes (for the same set of ligands) Statement-2: The crystal field stabilization energy of [Co(NH_(3))_(6)]^(3+)lt[Rh(NH_(3))_(6)]^(3+).
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 :B

Discussion

31.	STATEMENT-1: The value of Boyle's temperature for real gas is (T_(B) =(a)/(R_(b))) and STATEMENT-2: At Boyle's temperature, T_(B) real gases. behave ideally over long range of pressure.
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

32.	Statement-1: The time of completion of reactions of type A rarr product (order lt 1) may be determined. Statement-2 : Reactions with order ge 1 are either too slow or too fast and hence the time of completion can not be determined.
Answer» (A) (B) (C ) (D) ANSWER :C

Discussion

33.	Statement 1 : The tin obtained after smelting of black tin is known as block tin. Statement 2 : The tin can be cast into ingots or black.
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, stetament 2 is false Statement 1 is true, statement 2 is statement 2 is true Answer :A

Discussion

34.	Statement -1 : The two strands of DNA are complementary. Statement- 2: Cytosine always pairs with guanine and thymine pairs with adenine.
Answer» Statement -1 is True , Statement -2 is True, Statement -2 is a CORRECT explanation of 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. ANSWER :A

Discussion

35.	Statement-1 :Thethermal stability of hydrides of carbon family is in order: CH_(4)gtSiH_(4)gtGeH_(4)gtSnH_(4)gtPbH_(4) Statement-2: E-H bond dissociation enthalpies of the hydrides of carbon family decrease down the group with increasing atomic size.
Answer» STATEMENT-1 is TURE, Statement-2 is TRUE,Statement-2 is a correct explanation for Statement-1. Statement-1 is Ture, Statement-2 is True,Statement-2 is NOT a correct explalanation for Statement-1 Statement-1 is Ture, Statement-2 is False Statement-1 is False, Statement-2 is Ture Solution : Both are correct statement and statement-2 is the correct explanation for Statement-1.Down the group the size of atom INCREASES and thus bond length increases.

Discussion

36.	Statement-1 : The SRP of three metallic ions A^+,B^(2+),C^3 are -0.3,-0.5,0.8 volt respectively,so oxidising power of ions is C^(3+)ltA^+ltB^(2+) Statement-2: Higher the SRP, higher the oxidising power.
Answer» STATEMENT-1 is TRUE, statement-2 is true and statement2 is correct explanation for statement-2 Statement-1 is true, statement-2 is true and statement - 2 is NOT the correct explanation for statement-2 Statement - 1 is true, statement - 2 is false Statement - 1 is false, statement - 2 is true. Answer :A

Discussion

37.	Statement-1: The species [CuCl_(4)]^(2-) exists but [CUI_(4)]^(2-) does not. Statement-2: [NiCl_(2)(PPh_(3))_(2)] have tetrahedral geometry.
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 :B

Discussion

38.	Statement-1. The standard unit for expressing the mass of atoms in amu. Statement-2. amu is also called as avogram.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-2 is the 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 :Both Statement-1 and Statement-2 are correct STATEMENTS but statement-2 is not the correct explanation.

Discussion

39.	Statement 1: The standard emf (E_(cell)^(@)) of following concentration cell is zero. Zn(s)\|ZnSO_(4)(C_(1))\|\|ZnSO_(4)(C_(2))\|Zn(s) Statement 2: The electrolyte concentration cell will be is greater in cathodic half-cell.
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 :`E_(cell)^(o)=E_("Cathode")^(o)-E_("anode")^(o)` =0 for all concentration cells `E=(0.059)/(N)log_(10)((C_(2))/(C_(1)))` (for the given cell) LTBR the cell will be spontaneous (E=+ve) when `C_(2)` is greater than `C_(1)`, i.e., concentrtion in cathodic half-cell is greater than that of ANODIC half-cell.

Discussion

40.	Statement-1: The solution of Na in dry ether not only contains Na_("soln")^(+) and e_("soln")^(-) but also contains Na_("soln")^(+) formed by the following disproportionation reaction. 2Na(s)
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-4 Statement -1 is true, statement -2 is false Statement-1 is false, Statement-2 is true. Answer :A

Discussion

41.	STATEMENT-1: The reference electrode of silver-silver chlorlde is used as secordary reference electrode. and STATEMENT-2: The electrode is reversible with respect to CI^(-) 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 Answer :D

Discussion

42.	STATEMENT -1: Thesolubilityof maleicacidin wateris higherthan thatof fumaricacid . and STATEMENT- 2 :Maleicacidand fumaricacid arecis- trans isomers .
Answer» STATEMENT -1 is TRUE , STATEMENT-2 si True ,STATEMENT-2 is a correctexplanationfor STATEMENT -1 STATEMENT-1 is True, STATEMENT- 2IS True ,STATEMENT- 2 is NOT a correctexplanationfor STATEMENT-1. STATEMENT -1 is True ,STATEMENT-2is False STATEMENT -1is False , STATEMENT -2 is True ANSWER :B

Discussion

43.	Statement-1 : The ratio of Zn^2+ and F^(-) per unit cell of ZnS and CaF_2 is 1 :2 Statement-2 : In ZnS,Zn^2+ ions occupy alternate tetrahedral voids and in CaF_2, F^(-) ions occupy all the tetrahedral voids of FCC unit cell.
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 :In ZnS type (Zinc blende) (AB type) (4:4 coordination NUMBER COMPOUND): `CaF_2` [Flourite structure] [`AB_2` type] (8:4 coordination number compound): `S^(2-)` ion from the FCC lattice. `toZn^(2+)` ion occupy alternate (non adjacent) four tetrahedral void. `Ca^(2+)` ion from the FCC lattice. `to F^(-)` ion occupy all tetrahedral voids.

Discussion

44.	Statement-1. The rate constant of a pseudounimolecular reaction has the units of the rate constant of a second order reaction. Statement-2. A pseudounimolecular reaction is a reaction of second order in which one of the reactant is present in large excess.
Answer» Statement-1 is TRUE, Statement-2 is True , Statement-1 is a correct EXPLANATION of Statement-1. Statement-1 is True, Statement-2 is True , Statement-2 is NOT the correct explanation of Statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is False, Statement-2 is True. Solution :Statement-2 is the correct explanation of Statement-1 `(k'=k[H_(2)O]" so that "k=k'//[H_(2)O]=" time"^(-1)//"mol L"^(-1)="L mol"^(-1)" time"^(-1))`

Discussion

45.	Assertion (A): The rate of reaction increases generally by 2 to 3 times for every 10^(@)C rise in temperature. Reason (R ): An increase intemperature increases the colliison frequency.
Answer» SOLUTION :With increase of TEMPERATURE by `10^(@)` , the fraction of molecules having effective collisions becomes 2 or 3 TIMES.

Discussion

46.	Statement 1: The product formed is (B). Statement 2: The reaction proceeds via the formation of the following species in the order: Radical anion rarr Vinylic anion rarr Vinylic redical rarrProduct
Answer» a.Statement 1 and Statement 2 are true and Statement 2 is the correct explanation of Statement 1. b.Statement 1 and Statement 2 are true and Statement 2 is not the correct explanation of Statement 1. c.Statement 1 is true and statement 2 is false. d.Statement 1 is false and statement 2 is false Solution :The reduction of `(C-=C)` to `(C=C)` takes place by anti-addition of hydrogen with `(Na+ LIQ. NH_(3) + EtOH)`, so the product formed is `(B)`. Statement `1` is true. But statement `2` is false, since the mechanism of the reaction proceeds as FOLLOWS. Radical ANION `rarr` Vinylic redical `rarr` Vinylic anion rarr product. Statement `1` is true and statement `2` is false. So the answer is `(c )`.

Discussion

47.	Statement 1: The product (B) formed will be a racemic mixture. Statement 2: The above reaction is oxymercuration and demercuration, and it proceeds via the addition of D_(2)O, according to Markovnikov's rule, and with antiregiospecificity.
Answer» a.Statement 1 and Statement 2 are TRUE and Statement 2 is the CORRECT explanation of Statement 1. b.Statement 1 and Statement 2 are true and Statement 2 is not the correct explanation of Statement 1. c.Statement 1 is true and statement 2 is false. d.Statement 1 is false and statement 2 is false Solution :The reactant `(A)` is TRANS. Oxymercuration and demercuation take place by anti-MECHANISM, so the product `(B)` would be racemic [trans reactant (with two same group) + anti (trans) mechanism of REAGENT `rarr` Racemic product]. Both the statements `1` and `2` are true, so the answer is `(a)`.

Discussion

48.	Statement 1: The plot of atomic number (y-axis) versus number of neutrons (x-axis) for stable nuclei shows a curvature towards x-axis from the line of 45^(@) slope as the atomic number is increased, and Statement 2: Proton-Proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons in heavier nuclides.
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

49.	Statement-1: The oxidation state of Mo in the oxido complex species[Mo_(2)O_(2)(C_(2)H_(4))_(2)(H_(2)O)_(2)]^(2+) is +3. Statement-2: TheC_(2)H_(4)" and "H_(2)O are neutral ligands whereas O in as anionic ligand.
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 :`[overset(+6)(M)_(o2) overset(-4)(O_(2)) (C_(2)H_(4))_(2) (H_(2)O)_(2)]^(2+)`. Each Mo is +3. `O^(2-)` DONOR LIGAND

Discussion

50.	Statement-1 : The overall rate of a reversible reaction may decrease with the increase in temperature. Statement-2 : When the activation energy of forward reaction is less than that of backward reaction, then the increase in the rate of backward reaction is more than that of forward reaction on increasing the temperature.
Answer» (A) (B) (C ) (D) ANSWER :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: 1-Butene on reaction with HBr in the presence of a peroxide produces 1-bromo-butane Reason: It involves the free radical mechanism.

Statement -1: Zn^(+2) precipitated in the form of ZnS but not in the form Zn(NO_(3))_(2). And Statement -2: S^(-2) ion has high electron density w.r.t. NO_(3)^(-) ion.

STATEMENT-1: Zinc does not show characteristic properties of transition metals. and. STATEMENT-2: In zinc outermost shell is completely filled.

Statement -1: Zinc displaces copper from copper sulphate solution. and Statement 2: The E^(@) is Zn of - 0.76 volt and that of copper is +0.34 volt.

Statement - 1 : Wolframite impurities are separated from cassiterite by electromagnetic separation. And Statement - 2 : Cassiterite being magnetic is attracted by the magnet and forms a separate heap.

Statement-1: When the ligands are stronger, the distribution of six electrons of Co^(3+) ions is d_(xy)^(2),d_(yz)^(2)" and "d_(zx)^(2) Statement-2: t_(2g) orbitals corresponds to d_(xy),d_(yz)" and "d_(z^(2)).

Statement-1: When 2 faraday of electricity is passed through 0.1 MH_(2)SO_(4)(aq),11.2 litre O_(2) evolved at STP. Statement-2: Molecular weight of oxygen is 32.

STATEMENT-1: VO_(4)^(-3) is coloured due to charge transfer . STATEMENT-2: Colour due to charge transfer is highly intense colour STATEMENT-3: Fe may form Fe-Fe bond

Statement -1: Vinylidene chloride forms isotactic. Statement -2: Vinylidene chloride contains chiral carbon atoms

Statement-1: [V(CO)_(6)] cannot act as oxidising agent. Statement-2: It cannot be reduced by reducing agent.

Statement-1. Vapour pressure of water is less than 1.013 bar at 373K. Statement-2. Water boils at 373 K as the vapour pressure at this temperature becomes equal to atmosphere pressure.

Statement-1: Unsymmetrical ketone reacts with HCN to give (dil) mixture of carbohydrine. Statement-2: Cyanide ion is amident nucleophile.

STATEMENT -1 :unlikethe gtC = Ogroupof aldehyesandketones,the gt C = OofR - overset(O)overset(||)(C) - OH does not undergonucleophillicadditionreactions. andSTATEMENT- 2:Carboxylicacidsexistas dimers due tointermolecular hydrongen bonding .

Statement-1 : undergoes inversion in DMSO with hydroxide ion Statement-2 : The reaction proceeds by SN_(2) mechanism.

Statement-1. Under identical conditions, 1 L of O_(2) gas an 1 L of O_(3) gas contain the same number of oxygen atoms. Statement-2. 1 L of O_(2) and 1 L of O_(3) contain the same number of moles under identical conditions.

Statement-1 : Two reversible adiabats can never intersect. Statement-II : Efficiency of carnot engine cannot be one.

Statement-1: Toxic metal ions are removed by the chelating ligands. Statement-2: Chelate complexes tend to be more stable.

Statement-1: Triethylenetrtraamine is bidentate monoanion. Statement-2: Complex containing propylenediamine ligand shows ligand isoemrism.

Statement-1. To a solution of potassiumchromate, if a strong acid is added, it changes its colour from yellow to orange. Statement-2. The colour change is due to the change in the oxidation state of potassium chromate.

Statement 1 : To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange. Statement 2 : The colour change is due to the oxidation of potassium chromate.

Statement -1: Time taken for the completion of 75% of a 1st order reaction is double that t_(1//2). Statement-2: Time taken for completion of any fraction of 1st order reaction is a constant value.

Statement-1: [Ti(H_(2)O)_(6)]^(3+) is violet in colour while Ti^(3+) is colourless. Statement-2: Light correspondign to dnergy of blue-green region is absorbed by the complex to excite the electron from t_(2g) level to e_(g) level.

Statement-1 : There is no change in enthalpy of an ideal gas during compression at constant pressure. Statement-II : Enthalpy of an ideal gas is a function of temperature .

Statement-1 : There is no change in enthalpy of an ideal gas during compression at constant temperautre. Statement-II : Enthalpy of an ideal gas is a function of temperature and pressure.

Statement 1 : There is a natural asymmetry between converting work to heat and converting heat to work. Statement 2 : No porcess is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.

Statement-1: The value of Delta_(0) for M^(3+) complexes are always much higher than value for M^(2+) complexes (for the same set of ligands) Statement-2: The crystal field stabilization energy of [Co(NH_(3))_(6)]^(3+)lt[Rh(NH_(3))_(6)]^(3+).

STATEMENT-1: The value of Boyle's temperature for real gas is (T_(B) =(a)/(R_(b))) and STATEMENT-2: At Boyle's temperature, T_(B) real gases. behave ideally over long range of pressure.

Statement-1: The time of completion of reactions of type A rarr product (order lt 1) may be determined. Statement-2 : Reactions with order ge 1 are either too slow or too fast and hence the time of completion can not be determined.

Statement 1 : The tin obtained after smelting of black tin is known as block tin. Statement 2 : The tin can be cast into ingots or black.

Statement -1 : The two strands of DNA are complementary. Statement- 2: Cytosine always pairs with guanine and thymine pairs with adenine.

Statement-1 :Thethermal stability of hydrides of carbon family is in order: CH_(4)gtSiH_(4)gtGeH_(4)gtSnH_(4)gtPbH_(4) Statement-2: E-H bond dissociation enthalpies of the hydrides of carbon family decrease down the group with increasing atomic size.

Statement-1 : The SRP of three metallic ions A^+,B^(2+),C^3 are -0.3,-0.5,0.8 volt respectively,so oxidising power of ions is C^(3+)ltA^+ltB^(2+) Statement-2: Higher the SRP, higher the oxidising power.

Statement-1: The species [CuCl_(4)]^(2-) exists but [CUI_(4)]^(2-) does not. Statement-2: [NiCl_(2)(PPh_(3))_(2)] have tetrahedral geometry.

Statement-1. The standard unit for expressing the mass of atoms in amu. Statement-2. amu is also called as avogram.

Statement 1: The standard emf (E_(cell)^(@)) of following concentration cell is zero. Zn(s)|ZnSO_(4)(C_(1))||ZnSO_(4)(C_(2))|Zn(s) Statement 2: The electrolyte concentration cell will be is greater in cathodic half-cell.

Statement-1: The solution of Na in dry ether not only contains Na_("soln")^(+) and e_("soln")^(-) but also contains Na_("soln")^(+) formed by the following disproportionation reaction. 2Na(s)

STATEMENT-1: The reference electrode of silver-silver chlorlde is used as secordary reference electrode. and STATEMENT-2: The electrode is reversible with respect to CI^(-) ions.

STATEMENT -1: Thesolubilityof maleicacidin wateris higherthan thatof fumaricacid . and STATEMENT- 2 :Maleicacidand fumaricacid arecis- trans isomers .

Statement-1 : The ratio of Zn^2+ and F^(-) per unit cell of ZnS and CaF_2 is 1 :2 Statement-2 : In ZnS,Zn^2+ ions occupy alternate tetrahedral voids and in CaF_2, F^(-) ions occupy all the tetrahedral voids of FCC unit cell.

Statement-1. The rate constant of a pseudounimolecular reaction has the units of the rate constant of a second order reaction. Statement-2. A pseudounimolecular reaction is a reaction of second order in which one of the reactant is present in large excess.

Assertion (A): The rate of reaction increases generally by 2 to 3 times for every 10^(@)C rise in temperature. Reason (R ): An increase intemperature increases the colliison frequency.

Statement 1: The product formed is (B). Statement 2: The reaction proceeds via the formation of the following species in the order: Radical anion rarr Vinylic anion rarr Vinylic redical rarrProduct

Statement 1: The product (B) formed will be a racemic mixture. Statement 2: The above reaction is oxymercuration and demercuration, and it proceeds via the addition of D_(2)O, according to Markovnikov's rule, and with antiregiospecificity.

Statement-1: The oxidation state of Mo in the oxido complex species[Mo_(2)O_(2)(C_(2)H_(4))_(2)(H_(2)O)_(2)]^(2+) is +3. Statement-2: TheC_(2)H_(4)" and "H_(2)O are neutral ligands whereas O in as anionic ligand.