94420 + Interview Questions in Chemistry in Class 12

1.	Statement-1. One molar aqueous solution has always higher concentration than one molal solution. Statement-2. One molar solution contains less solvent than one molal solution.
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 :Statement - 2 is the correct explanation of Statement - 1.

Discussion

2.	Statement-1 : On passing CO_(2) gas through lime water, the solution turns milky. Statement-2 Acid Base (neutralisation) reaction takes place.
Answer» Statement-1 is TRU, statement-2 is TRUE and statement-2 is correct EXPLANATION for statement-1 Statement-1 is true, statement-2 is true and statement-2 is is NOT the 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: O_(3) reacts with KOH and forms a paramagnetic compound. Statement-2: KO_(3) is paramagnetic. Statement-3: O_(2) gives O_(2)^(-) when heated with Na//NH_(3)
Answer» FTF TFT TTT FFF Answer :C

Discussion

4.	Statement-1. Nylon -6,6 is a thermoplastic polymer. Statement-2 It is prepared by condendation polymerization of hexamethylenediamine and adipic acid.
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 explanation : It can be MELTED and reworked as MANY times as desired.

Discussion

5.	Statement-1: Nucleophilic substitution on an optically active alkyl halide gives a mixture of enantiomers. Statement-2: The reactionn occurs accoding to S_(N)2 mechanism.
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 Fasle, Statement-2 is True. Solution :Correct statement-2: The REACTION OCCURS according to `S_(N)1` mechanism.

Discussion

6.	STATEMENT-1: Noble gases have highest ionization in their repsective periods and STATEMENT-2: Noble gases have stable closed shell electronic configuration.
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 :A

Discussion

7.	Statement-1 : NO_(3)^(-) and PO_(3)^(-) have similar formula type but differ structurally, i.e., they have different type of hybridisation. Statement-2 : NO_(3)^(-)ion exists as free ion. On the other hand PO_(3)^(-) exists as cyclic or linear polymeric structure.
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

8.	Statement 1 : NO_(3)^(-) ion is reduced in preference to hydronium ion. Statement 2 : Zn gives H_(2) gas with dil. HCl and also with dil. H_(2)SO_(4).
Answer» Statememt 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 si not a correct explanation for statement 2 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is ture Solution :`Zn+underset(dil.)(2HCl)rarrZnCl_(2)+H_(2)uarr` `Zn+underset(dil.)(H_(2)SO_(4)rarrZnSO_(4)+H_(2)uarr` `4Zn+underset((dil.))(10HNO_(3))rarr 4Zn(NO_(3))_(2)+N_(2)O+5H_(2)O`

Discussion

9.	Statement-1 : NO_(2)^(–) ion can not be detected by brown ring test in presence of NO_(3)^(–) Statement-2: Both NO_(2)^(–) and NO_(3)^(–) ions are confirmed by brown ring test.
Answer» Statement-1 is TRU, statement-2 is true and statement-2 is CORRECT explanation for statement-1 Statement-1 is true, statement-2 is true and STATE- ment-2 is is NOT the correct explanation for state- ment-1. Statement-1 is true, statement-2 is false. Statement-1 is false, statement-2 is true. Answer :C

Discussion

10.	Statement-1: [Ni(CN)_(4)]^(2-) is a paramagnetic complex. Statement-2: Thecomplex is inner orbital complex.
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(+2)(Ni)(CN)_(4)]^(2-)` is `d^(8)` config., `DSP^(2)` hyb, DIAMAGNETIC.

Discussion

11.	Statement-1: [NiF_(6)]^(4-)" and "[NiF_(6)]^(2-) both are high spin complexes. Statement-2:F^(-) is weakfield 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 :`[NiF_(6) ]^(2-)` is SPIN paired complex because of `Ni^(4+)`

Discussion

12.	Statement- 1: Nickel is purifiedbyreactingit with CO. Statement - 2 : Impuritiespresentin nickelfrom volatilecompounds.
Answer» Statement - 1 is True, Statement -2 ISTRUE, Statement-2iscorrectexplanationofStatement -1. Statement- 1isTrue , Statement- 2 is not a correct explanation ofStatement - 1. Statement - 1IS True, Statement - 2isFalse. Statement- 1 isFalse,Statement - 2isTrue. SOLUTION :Correct statement - 2:Nickelreactswith COtoform VOLATILE ` Ni(CO)_ 4 `.

Discussion

13.	Statement-1: NH_(2)NH_(2) athough possesses two electron pairs for donation but cannot act as a chelating agent . Statement-2: The coordination by NH_(2)NH_(2) leads to a three member highly unstablestrained ring.
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

14.	Statement-1: NF_(3) is a weaker ligand than N(CH_(3))_(3). Statement-2: NF_(3) ionises to give F^(-) ions in aqueous solution.
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 :`NF_(3)` does not ionise in solution.

Discussion

15.	Statement 1 : NH_(4)NO_(2) on acidification gives brown gas and on alkalination gives a gas which on reaction with HCl gives white fumes because. Statement 2 : NH_(4)NO_(2) and acidification gives NO_(20 brown gas and alakalination gives NH_(3) gas.
Answer» Solution :`NH_(3)NO_(2)overset(HCl)(RARR)NH_(4)-Cl+NO_(2)` `NH_(4)NO_(2)+NaOH rarr NaNO_(2)+H_(2)O+NH_(3)uarr`

Discussion

16.	Statement 1 : Nessler'sreagent gives a brown precipitate with NH_(3). Statement 2 : NH_(4)OH gives brown ppt with Fe^(3+)
Answer» Solution :Alkaline solution of `K_(2()[HgI_(4)]` gives a BROWN precipitate to MILLION's base `H_(2)N.H-gO.HgI` with `NH_(3)`.

Discussion

17.	STATEMENT - 1 : NaNO_(2) and NaNO_(3) gives brown ring test. STATEMENT - 2 : Both gives blue coloured gas with conc. H_(2)SO_(4). STATEMENT - 3 : NO_(3)^(-) gives ammonia with NaOH in presence of Cu.
Answer» TFT TTT FTF TTF Answer :B

Discussion

18.	Statement 1: NBS is a specific reagent for allylic bromination. Statement 2: Allylic bromination occurs through free radial intermediates.
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 Statement 1 is true, statement 2 is FALSE Statement 1 is false, statement 2 is true Answer :B

Discussion

19.	Statement-1 . Natural rubber is an elastomer. Statement-2 . The intermolecular forces of attraction are due to dipole- dipole interactions.
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 -2 : The intermolecular forces of attractions are DUE to VAN der Waals forces.

Discussion

20.	Statement-1. NBS is a specific reagent for allylic bromination. Statement-2. Allylic bromination occurs through free radical intermediates.
Answer» Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT explanation of statement-1.<BR>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 FASLE, Statement-2 is True. Solution :Correct explanation. NBS gives a constant low concentration of `Br_(2)` thereby favouring substitution and preventing addition REACTION.

Discussion

21.	Statement-1: n-Butyl chloride has higher boiling point than n-butyl bromide. Statement-2. C-Cl bond is more polar than C-Br bond.
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 FASLE, Statement-2 is True. Solution :Correct statement-1:n-butyl BROMIDE has higher boiling point than n-butyl chloride.

Discussion

22.	Statement 1: N_(2)F_(3)^(+) is planar at each nitrogen atom Statement 2: In N_(2)H, the bond angle H-N-H is 120^(@) and bond the N-N bond length are not equal
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 :(i) BOND angle `112^(@)` duet o `I_(p)-b_(p)` repulsion. (ii) SMALLER bond length 1.13Å due to the ATTRACTION between the opposite POLES.

Discussion

23.	STATEMENT-1: N/10, 100 ml KMnO_(4) solution is sufficient to oxidise M/10, 50 ml FeC_(2)O_(4) solution in acidic medium. STATEMENT-2: The left solution of statement -1 is sufficient to react with 8.33 ml of M/10 K_(2)Cr_(2)O_(7) solution in acidic medium. STATEMENT-3: 1.06 g Na_(2)CO_(3) will require 100 ml of 0.1 M HCl solution with phenolphthalein.
Answer» F T T F T F T F T T T F ANSWER :A

Discussion

24.	Statement-1: Molten state of IF_(5) is slightly conducting. Statement-2:IC l is more reactive than Cl_(2). Statement-3: In molten state of ClF_(3), chlorine may possess sp^(3)d^(2) hybridisation.
Answer» FTF TFT TTT FFF Answer :C

Discussion

25.	Statement-1 : Moles of Sr^(2+) of furnished by sparingly soluble substance Sr(OH)_(2) decreases due to dilution in its saturated solution. Statement-2 : Solubility product constant of Sr(OH)_(2) is not affected by dilution.
Answer» Statement (1) is correct and statement (2) is correct and statement (2) is correct explanation for (1) Statement (1) is correct and statement (2) is correct and statement (2) is NOT correct explanation for (1) Statement (1) is TRUE but (2) is FALSE Statement (1) is false but (2) is true Answer :D

Discussion

26.	Statement-1: Molecules that are not superimposable on their mirror images are chiral.because Statement-2: All chiral moleculs have chiral centres.
Answer» Statement-1 is TRUE, statement-2 is true and statement-2 is CORRECT EXPLANATION for statement-1 Statement-1 is true, statement-2 is true and statement-2 is NOT correct explanation for statement-1 Statement-1 is true, statement-2 is FALSE Statement-1 is false, statement-2 is true Answer :C

Discussion

27.	Statement-1 : Molarity of a solution depends on temperature but molality is independent of temperature Statement-2 : Molarity depends on volume of solution but molality depends on mass of solvent
Answer» STATEMENT-1 is true, statement -2 is true and statement-2 is CORRECT explanation for statement-3 Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-3 Statement-1 is FALSE, statement-2 is true Statement-1 is true, statement-2 is false Answer :A

Discussion

28.	Statement-1 : Molarity and molality have almost same value for a very dilute aqueous solution Statement-2 : In all very dilute solution, the mass of solvent (in gm) is equal to the volume of solution (in ml)
Answer» Statement-1 is TRUE, statement -2 is true and statement-2 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 false, statement-2 is true Statement-1 is true, statement-2 is false Answer :C

Discussion

29.	STATEMENT-1 : MnO_(4)^(-) is tetrahedral in shape . and STATEMENT-2: KMnO_(4) is purple in colour .
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 ANSWER :B

Discussion

30.	STATEMENT - 1 : Moistened ammonium slats give the smell of NH_(3). and STATEMENT - 2 : Ammonium salts give NH_(3) on heating with conc. NaOH
Answer» Statement-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 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 :B

Discussion

31.	Statement-1. MnO is basicwhereas Mn_(2)O_(7)is acidic. Statement-2. Higher the oxidation state of a transition metal in itsoxide, greater is the acidic character.
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.

Discussion

32.	Statement-1.Michlless are formed by surfactant molecules above the cirtical micellar concentration (CMC) Statement-2. The conductivity of a solution having sufficient molecules decreases sharpy at the CMC.
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 :The formation of micelles TAKES place above CMC. Hence, statement-1 is True, Each micelle contains at LEAST 100 molecules. Hence, CONDUCTIVITY of the solution decreases sharply at the CMC. Hence statement-2 is also True but it is NOT the correct explanation of statement-1.

Discussion

33.	Statement 1: Micelles are formed by surfactant molecules above the critical micellar concentration (CMC), because Statement 2: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
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

34.	Statement-1: Metals of high purity are obtained by zone refining. Statement-2: Impurities in the ore are more soluble in the metal than in the pure metal
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 :b

Discussion

35.	Statement- 1: Metalsofhigh purityare obtainedbyzonerefining. Statement- 2 : Impuritiesare moresolubleinthemelt thaninpuremetal.
Answer» STATEMENT - 1 is True, Statement -2 isTrue, Statement-2iscorrectexplanationofStatement -1. Statement- 1isTrue , Statement- 2 is not a CORRECT EXPLANATION ofStatement - 1. Statement - 1is True, Statement - 2isFalse. Statement- 1 isFalse,Statement - 2isTrue. Answer :A

Discussion

36.	STATEMENT - 1 : MESH is more basic than MeOH. STATEMENT - 2 : O is more electrongative than S.
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

37.	STATEMENT-1: Mercury is liquid at room temperature. and STATEMENT-2: in mercury, there is no unpaired d-electron and thus metallic bonding is weakest
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

38.	Statement-1: Mass, volume and pressure are extensive properties. Statement-2: Extensive properties depent upon the amount of the substance.
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 :A

Discussion

39.	Statement-1: m-Methoxyphenol is a stronger aciid than p-methoxyphenol Statement-2: Methoxy group +R-effect at both o- and p-positions.
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 explanation. Methoxy GROUP exerts -I-effect at m-position and +R-effect at p-position THEREBY making m-methoxyphenol a STRONGER ACID than p-methoxyphenol.

Discussion

40.	Statement-1. Manganeseshows amaximum oxidation state of +5 Statement-2. Manganese has 5 electrons in the 3d subshell.
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 :Correct Statement-1 . Manganese SHOWS a maximum oxidation STATE of `+7` ( as it has `3d^(5) 4s^(2)` configurationand the energy difference between 3dand 4s subshells is small ).

Discussion

41.	Statement-1: m-Methoxyaniline (m-anisidine) is a weaker base than p-methoxyaniline (p-anisidine). Statement-2: Atm-position, methoxy group can exert only +R-effect but not -I-effect.
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 2: At m POSITION, methoxy GROUP can exdrt only -I-effect but not +R-effect.

Discussion

42.	Statement-1. lyophilic colloids are more stable than lyophobic colloids. Statement-2. In lyophobic system, the dispersed particles are more silvated than in lyophilic system.
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-2, In hyophilic statem, the DISPERSED particles are more SOLVATED than in hyophobic system.

Discussion

43.	Assertion : Lyophilic sols are more stable than Lyophobis sols. Reason : Lyophilic sols are more readily hydrated than lyophobic sols.
Answer» ANSWER :a

Discussion

44.	Statement 1 : Lowering of vapour pressure is directly proportional to the number of species present in the solution. Statement 2 : The vapour pressure of 0.1M sugar solution is more than 0.1 M KCl solution.
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 :Lowering of vapour pressure is a colligative property.

Discussion

45.	Statement-1: Lithium is the most powerful reducing agent and sodium is the least powerful reducing agent amongst the alkali metals in aqueous solutions. Statement-2:Lithium has the highest hydration enthalpy and the sodium the least value.
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 :(i)`E^0Li^(+)//Li= - 3.04 , Na^(+)//Na=-2.71` which is least among the alkali metals. (ii)Hydration enthalpy /`KJ mol^(-1)` Li= -506 , Na=-406 , CS has the least `DeltaH_(hyd)=-276`

Discussion

46.	Statement-1: Low activation energy means the reaction will be faster. Statement-2 A thermodynamically stable product is always formed easily.
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 :A thermodynamically stable product with high ACTIVATION energy is not formed esily,PARTICULARLY at low temperature.

Discussion

47.	Statement 1: Lower the activation energy, faster is the reaction. Statement 2 : Catalyst does not affect activation energy of the reaction.
Answer» Statement 1: is true, Statement 2 is true, and Statement 2 is a CORRECT explanation of statement 1 Both statement are true but statement 2 is not a correct explanation for statement 1 Statement 1 is true and statement 2 is false Statement 1 is false and Statement 2 is true ANSWER :C

Discussion

48.	Statement 1: Li is the strongest reducing agent among all the elements of periodic table statement 2: Li has the lowest hydration energy among the alkali metals.
Answer» STATEMENT 1 is true, statement 2 is true, statement 2 si a correct EXPLANATION for statement 14 Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 14 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :Statement 1 is true but statement 2 is false due to smaller SIZE of `Li^(+)` it has higher hydration energy by which it has high SRP value (-3.03v). So it is a STRONGEST reducing agent AMONG the elements of periodic table.

Discussion

49.	Statement-1 : Li and Mg show diagonal relationship. Statement-2 : Li and Mg have nearly same atomic radius.
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

50.	Statement - 1 : Leaching in the proces of converting the ore into oxide and then reducing it. And Statement - 2 : Leaching is done in a blast furnace.
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

Explore topic-wise InterviewSolutions in Current Affairs.

Statement-1. One molar aqueous solution has always higher concentration than one molal solution. Statement-2. One molar solution contains less solvent than one molal solution.

Statement-1 : On passing CO_(2) gas through lime water, the solution turns milky. Statement-2 Acid Base (neutralisation) reaction takes place.

Statement-1: O_(3) reacts with KOH and forms a paramagnetic compound. Statement-2: KO_(3) is paramagnetic. Statement-3: O_(2) gives O_(2)^(-) when heated with Na//NH_(3)

Statement-1. Nylon -6,6 is a thermoplastic polymer. Statement-2 It is prepared by condendation polymerization of hexamethylenediamine and adipic acid.

Statement-1: Nucleophilic substitution on an optically active alkyl halide gives a mixture of enantiomers. Statement-2: The reactionn occurs accoding to S_(N)2 mechanism.

STATEMENT-1: Noble gases have highest ionization in their repsective periods and STATEMENT-2: Noble gases have stable closed shell electronic configuration.

Statement-1 : NO_(3)^(-) and PO_(3)^(-) have similar formula type but differ structurally, i.e., they have different type of hybridisation. Statement-2 : NO_(3)^(-)ion exists as free ion. On the other hand PO_(3)^(-) exists as cyclic or linear polymeric structure.

Statement 1 : NO_(3)^(-) ion is reduced in preference to hydronium ion. Statement 2 : Zn gives H_(2) gas with dil. HCl and also with dil. H_(2)SO_(4).

Statement-1 : NO_(2)^(–) ion can not be detected by brown ring test in presence of NO_(3)^(–) Statement-2: Both NO_(2)^(–) and NO_(3)^(–) ions are confirmed by brown ring test.

Statement-1: [Ni(CN)_(4)]^(2-) is a paramagnetic complex. Statement-2: Thecomplex is inner orbital complex.

Statement-1: [NiF_(6)]^(4-)" and "[NiF_(6)]^(2-) both are high spin complexes. Statement-2:F^(-) is weakfield ligand.

Statement- 1: Nickel is purifiedbyreactingit with CO. Statement - 2 : Impuritiespresentin nickelfrom volatilecompounds.

Statement-1: NH_(2)NH_(2) athough possesses two electron pairs for donation but cannot act as a chelating agent . Statement-2: The coordination by NH_(2)NH_(2) leads to a three member highly unstablestrained ring.

Statement-1: NF_(3) is a weaker ligand than N(CH_(3))_(3). Statement-2: NF_(3) ionises to give F^(-) ions in aqueous solution.

Statement 1 : NH_(4)NO_(2) on acidification gives brown gas and on alkalination gives a gas which on reaction with HCl gives white fumes because. Statement 2 : NH_(4)NO_(2) and acidification gives NO_(20 brown gas and alakalination gives NH_(3) gas.

Statement 1 : Nessler'sreagent gives a brown precipitate with NH_(3). Statement 2 : NH_(4)OH gives brown ppt with Fe^(3+)

STATEMENT - 1 : NaNO_(2) and NaNO_(3) gives brown ring test. STATEMENT - 2 : Both gives blue coloured gas with conc. H_(2)SO_(4). STATEMENT - 3 : NO_(3)^(-) gives ammonia with NaOH in presence of Cu.

Statement 1: NBS is a specific reagent for allylic bromination. Statement 2: Allylic bromination occurs through free radial intermediates.

Statement-1 . Natural rubber is an elastomer. Statement-2 . The intermolecular forces of attraction are due to dipole- dipole interactions.

Statement-1. NBS is a specific reagent for allylic bromination. Statement-2. Allylic bromination occurs through free radical intermediates.

Statement-1: n-Butyl chloride has higher boiling point than n-butyl bromide. Statement-2. C-Cl bond is more polar than C-Br bond.

Statement 1: N_(2)F_(3)^(+) is planar at each nitrogen atom Statement 2: In N_(2)H, the bond angle H-N-H is 120^(@) and bond the N-N bond length are not equal

Statement-1: Molten state of IF_(5) is slightly conducting. Statement-2:IC l is more reactive than Cl_(2). Statement-3: In molten state of ClF_(3), chlorine may possess sp^(3)d^(2) hybridisation.

Statement-1 : Moles of Sr^(2+) of furnished by sparingly soluble substance Sr(OH)_(2) decreases due to dilution in its saturated solution. Statement-2 : Solubility product constant of Sr(OH)_(2) is not affected by dilution.

Statement-1: Molecules that are not superimposable on their mirror images are chiral.because Statement-2: All chiral moleculs have chiral centres.

Statement-1 : Molarity of a solution depends on temperature but molality is independent of temperature Statement-2 : Molarity depends on volume of solution but molality depends on mass of solvent

Statement-1 : Molarity and molality have almost same value for a very dilute aqueous solution Statement-2 : In all very dilute solution, the mass of solvent (in gm) is equal to the volume of solution (in ml)

STATEMENT-1 : MnO_(4)^(-) is tetrahedral in shape . and STATEMENT-2: KMnO_(4) is purple in colour .

STATEMENT - 1 : Moistened ammonium slats give the smell of NH_(3). and STATEMENT - 2 : Ammonium salts give NH_(3) on heating with conc. NaOH

Statement-1. MnO is basicwhereas Mn_(2)O_(7)is acidic. Statement-2. Higher the oxidation state of a transition metal in itsoxide, greater is the acidic character.

Statement-1.Michlless are formed by surfactant molecules above the cirtical micellar concentration (CMC) Statement-2. The conductivity of a solution having sufficient molecules decreases sharpy at the CMC.

Statement 1: Micelles are formed by surfactant molecules above the critical micellar concentration (CMC), because Statement 2: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

Statement-1: Metals of high purity are obtained by zone refining. Statement-2: Impurities in the ore are more soluble in the metal than in the pure metal

Statement- 1: Metalsofhigh purityare obtainedbyzonerefining. Statement- 2 : Impuritiesare moresolubleinthemelt thaninpuremetal.

STATEMENT - 1 : MESH is more basic than MeOH. STATEMENT - 2 : O is more electrongative than S.

STATEMENT-1: Mercury is liquid at room temperature. and STATEMENT-2: in mercury, there is no unpaired d-electron and thus metallic bonding is weakest

Statement-1: Mass, volume and pressure are extensive properties. Statement-2: Extensive properties depent upon the amount of the substance.

Statement-1: m-Methoxyphenol is a stronger aciid than p-methoxyphenol Statement-2: Methoxy group +R-effect at both o- and p-positions.

Statement-1. Manganeseshows amaximum oxidation state of +5 Statement-2. Manganese has 5 electrons in the 3d subshell.

Statement-1: m-Methoxyaniline (m-anisidine) is a weaker base than p-methoxyaniline (p-anisidine). Statement-2: Atm-position, methoxy group can exert only +R-effect but not -I-effect.

Statement-1. lyophilic colloids are more stable than lyophobic colloids. Statement-2. In lyophobic system, the dispersed particles are more silvated than in lyophilic system.

Assertion : Lyophilic sols are more stable than Lyophobis sols. Reason : Lyophilic sols are more readily hydrated than lyophobic sols.

Statement 1 : Lowering of vapour pressure is directly proportional to the number of species present in the solution. Statement 2 : The vapour pressure of 0.1M sugar solution is more than 0.1 M KCl solution.

Statement-1: Lithium is the most powerful reducing agent and sodium is the least powerful reducing agent amongst the alkali metals in aqueous solutions. Statement-2:Lithium has the highest hydration enthalpy and the sodium the least value.

Statement-1: Low activation energy means the reaction will be faster. Statement-2 A thermodynamically stable product is always formed easily.

Statement 1: Lower the activation energy, faster is the reaction. Statement 2 : Catalyst does not affect activation energy of the reaction.

Statement 1: Li is the strongest reducing agent among all the elements of periodic table statement 2: Li has the lowest hydration energy among the alkali metals.

Statement-1 : Li and Mg show diagonal relationship. Statement-2 : Li and Mg have nearly same atomic radius.

Statement - 1 : Leaching in the proces of converting the ore into oxide and then reducing it. And Statement - 2 : Leaching is done in a blast furnace.