94420 + Interview Questions in Chemistry in Class 12

1.	Statement -1: alpha-Keratin is a structural protein Statement -2: It is globular protein.
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 :It is a fibrous protein.

Discussion

2.	Statement 1 : Al(OH)_(3) is amphoteric in nature statement 2: Al-O and O-H bonds can be broken with equal ease in Al(OH)_(3)
Answer» STATEMENT 1 is true, statement 2 is true, statement 2 si 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 Solution :Both Statement 1 and statement 2 are correct and statement 2 EXPLAINS statement 1

Discussion

3.	Statement 1: All the halogens are coloured. Statement 2: Halogen molecules absorb some wavelengths of visible light and the electrons are promoted to higher energy molecular orbitals.
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 the correct explanation for statement -1 Statement -1 is true- statement-2 is FALSE. Statement- 1 is false, statement -2 is true. Answer :A

Discussion

4.	Statement-1: All tetrahedral complexes are mainly high spin and the low spin configurations are rarely observed. Statement-2: Delta_(t) is always much smaller even with stronger field ligands and it is never energetically favourable to pair up the 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

5.	Statement - 1: All minerals areores. Statement - 2: Oresare mineralsfrom whichmetal canbeextractedconvenientlyand economically.
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 :Correctstatement- 1: Alloresareminerals.

Discussion

6.	Statement 1 : All metals can not be obtained by carbon reduction. Statement 2 : Carbon is a strong 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, stetament 2 is false Statement 1 is true, statement 2 is statement 2 is true Answer :A

Discussion

7.	Statement-1: All known monouclear complexes of chromium with +3 oxidation state, irrespective of the strength of the ligand must have three unpaired electrons. Statement-2: In complex [Cr(NH_(3))_(4)BrCl]Cl,the 'spin only' magnetic is close to 3.87 BM.
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

8.	Statement-1: Aldehyde and ketone give nucleophilic addition reactions with carbon oxygen, nitrogen and sulphur nucleophiles. Statement-2: Sulphite ion is ambident nucleophile.
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 Answer :A

Discussion

9.	Statement-1: Alcohols gives only substitution products with HX and not elimination product. Statement-2: overline(X) is a very weak which can not abstract proton from alcohol.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for statement-10 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 :C

Discussion

10.	Statement-1: Alcohols can not be dried by CaCl_(2). Statement-2: CaCl_(2) forms solvated molecules with alcohols.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for statement-8 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 :C

Discussion

11.	STATEMENT-1: Alcino steel is used for making permanent magnets. and STATEMENT-2: Alcino steel is highly magnetic. (A) (B)(C) S (D)
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

12.	Statement - 1 : Al is used as a reducing agent in aluminothermy. And Statement - 2 : Al has a lower melting point than Fe, Cr and Mn.
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

13.	Statement 1 : Al is used as a reducing agnet in aluminothermy. Statement 2 : Al has a lower melting point than Fe. Cr and Mn.
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 Solution :Al is more electropositive than `Fe,Cr and MN`

Discussion

14.	STATEMENT-1: AICI_(3) forms dimer Al_(2)CI_(5) but it dissolves in water forming [Al(H_(2)O_(6))^(3+) and CI ions. and STATEMENT-2: Aqueous solution of AICI, is acidic due to hydrolysis.
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

15.	Statement - 1 : Ag and Au are extracted by leaching their ores with a dilute solution of NaCN. And Statement - 2 : Impurities associated with these ores dissolve in NaCN.
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

16.	Statement-1 : Adiabatic process must be isentropic process. Statement-II : dS=(dq_("rev"))/T
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

17.	Statement 1: Addition of bromine to trans-2-butene yields meso-2,3-dibromobutane. Statement 2: Bromine addition to an alkene is an electrophilic addition.
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 Solution :NBS gives a constant low concentrated of `Br_(2)` thereby favouring substitution ad preventing ADDITION REACTION.

Discussion

18.	Statement-1: Addition of bromine on trans -2 butene yeilds meso-2,3-dibromo butane. Statement-2: The addition of Br_(2) on double bond is anti-addition.
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 :ADDITION of `Br_(2)` on TRANS-`2` butene gives meso`-2,3-`dibromo butane FOLLOWING anti-addition, which is however electrophilic ONE.

Discussion

19.	Statement-1: active mass of pure solid and pure liquid is taken unity. and Statement -2 : The active mass of pure solids and liquids depends on density and molecular mass . The density and molecular mass of pure liquidsand solids are constant.
Answer» Statement -1 is TRUE, Statement -2 is true , Statement-2 is correct EXPLANATION for Statement -4 Statement-1 is True, Statement-2 is true, Statement-2 ISNOT 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

20.	Statement-1. Addition of Br_(2) to 1-butene gives two optical isomers. Statement-2: The product contains one asymmetric carbon.
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 :Statement-2 is the correct explanation of statement-1.

Discussion

21.	Statement 1: Acrylic acid is a weaker acid than benzoic acid. Statement 2: Ethylenic double bond is less electron donating than benzene 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 Solution :Ethylenic double BOND is more ELECTRON DONATING than a benzene ring.

Discussion

22.	Statement 1: Acryaldehyde (CH_(2)=CH-CHO) is oxidised to acrylic acid (CH_(2)==CH-COOH) by Benedict's solution. Statement 2: Benedict's solution is ammoniacal CuSO_(4) solution containing sodium potassium tartarate.
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 :Statement `1` is true, but statement `2` is false because Benedict's solution is AMMONIACAL `CuSO_(4)` solution containing sodium CITRATE.

Discussion

23.	Statement 1: Acrylic acid (CH_(2)=CHCOOH) is a weaker acid than benzoic acid (C_(6)H_(5)COOH). Statement 2: Ethylenic double bond is less electron-donating than benzene 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 Solution :Correct statement 2: Ethylenic DOUBLE bond is more electron-donating than a benzene ring.

Discussion

24.	Statement-1: AcidcatalyzeddehydrationfollowsE_(1)mechanismStatement - 2 :Tertiaryalcohols are morereactivethanprimaryalcoholstowards HBr. Statement-3 :Dehydrohalogenation of alkylhalidefollows E_(2) mechanism
Answer» TTF TFT FFT TTT Answer :A

Discussion

25.	Statement-1: Acid catalysed dehydration of t-butanol is faster than n-butanol. Statement-2: The order of stability of carbocation is 3^(@)gt2^(@)gt1^(@).
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is a CORRECT EXPLANATION for statement-9 statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-9 statement-1 is true, statement-2 is FALSE statement-1 is false, statement-2 is true Answer :C

Discussion

26.	Statement-1: Acetylaceotne complexes of the metal ions are more stable than the corresponding ethylenediamine complexes. Statement-2: Acetylacetone complexes of the metal ions contain a six membered conjugate chelate rings and the resonance in its chelate ion is an additional factor contributing to the stability.
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: Aceto acetic ester (CH_(3)COCH_(2)COOC_(2)H_(5)) contains CH_(3)CO gp. But does not give Iodoform test. Statement 2: The H-atoms of the CH_(3) gp. Are more acidic than those of CH_(2)gp.
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 :The H-atoms of the `CH_(2)` group are more acidic than those.

Discussion

28.	Statement 1: Acetoacetic ester (CH_(3)COCH_(2)COOC_(2)H_(5)) contains CH_(3)CO group but does not give iodoform test. Statement-2: The H-atoms of the CH_(3) group are more acidic than those of CH_(2) group.
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: The H-atoms of the `CH_(2)` GROUP are more acidic than those of `CH_(3)` group.

Discussion

29.	STATEMENT-1 : According to the lock - and - key model. When the key (substrate) fits the lock (active site) the chemical change bedins. STATEMENT-2 : Modern X-ray crystallographic and spectroscopic methods show that in many cases, the enzyme changes shape when the substrate lands at the active site. STATEMENT- 3 : Enzyme catalysed reactions processed through a fast, reversible formation of an enzyme substrate complex, followed by a slow conversion to product and free enzyme.
Answer» T F T F T T T T T T T F ANSWER :`(3)`

Discussion

30.	STATEMENT - 1 : Aceticaciddoes not undergo haloform reaction . and STATEMENT - 2 : Acetic acidhas noalpha hydrogen .
Answer» STATEMENT -1 is True ,STATEMENT -2IS True, STATEMENT-2is a correct explanationfor STATEMENT -1 . STATEMENT-1 is True, STATEMENT-2 is True , STATEMENT -2is NOT a correct explanationfor STATEMENT - 1 STATEMENT-1is True, STATEMENT - 2 is False . STATEMENT-1is False , STATEMENT-2is True . ANSWER :C

Discussion

31.	Assertion (A): A is very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow precipitate of CdS on passing hydrogen sulphide. Reason (R) : Solubility product of CdS is more than that of NiS.
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 :`Cd^(2+)` is a `2^(nd)` group radical and `Ni^(2+)` is a `4^(TH)` group radical. So solubility PRODUCT of NiS has to be more than CdS. Further `Cd^(2+)` gives yellow colour of CdS with `H_(2)S`, but `Ni^(2+)` gives black colour of NiS with `H_(2)S`. So both statement 1 and statement 2 are wrong.

Discussion

32.	Statement-1.A sol Sa_(2)S_(3) prepared by the action of H_(2)S on As_(2)O_(3) is negativity charged. Statement-2. It is due to the presence of S^(2-) ions in the diffused layer.
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, it is due to adsorption of `S^(2-)` ions on the SURFACE of the colloidal particles and `H^(+)` ions in the diffused LAYER.

Discussion

33.	Statement-1. A single C^(12) atom has a mass exactly 12 amu and a mole of these atoms has a mass of exactly 12 grams. Statement-2. A mole of atoms of any element has a mass in grams equal to its atomic mass.
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. Answer :A

Discussion

34.	Statement 1 : A mixture of the solutions of a weak acid and its conjugate base is acts as a good buffer. Statement 2 : The ratio of the conjugates base of acid in the mixture does not change substantially when small amount of acids or alkalies are added to the buffer.
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 is not a correct explanation for statement 2 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true ANSWER :B

Discussion

35.	STATEMENT - 1 : A mixture of ZnO and CuO can be separated by boiling the mixture with NaOH solution. and STATEMENT - 2 : ZnO dissolves in NaOH solution while CuO remains undissolved.
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 Answer :A

Discussion

36.	Statement-1. A low level of noradrenaline in the body causes depression. Statement-2. Antidepressant drugs catalyse the degradation of noradrenaline.
Answer» If both ASSERTION and reason are TRUE, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false. Solution :CORRECT statement-2 . ANTIDEPRESSANT DRUGS inhibit enzymes which cause the degradation of noradrenaline

Discussion

37.	Statement-1: A fractional order reaction must be a complex reaction. Statement-2 : Fractional order of RDS equals to
Answer» (A) (B) (C ) (D) ANSWER :C

Discussion

38.	Statement-1 : A decrease in pressure leads to an increase in freezing point of water. Statement-2 : For ice on melting volume decreases.
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-I is FALSE, statement-2 is true. Statement-1 is true, statement-2 is false. Answer :A

Discussion

39.	STATEMENT - 1 : A dark blue colour is obtained on adding excess of dilute NH_(4)OH solution in aqueous soluiton of copper sulphate. and STATEMENT - 2 : Dark blue colour is due to the formation of [Cu(NH_(3))_(4)]^(2+) complex ion.
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 Answer :A

Discussion

40.	Statement-1 : A catalyst provides an alternative path to the reaction in which conversion ofreactants into products takes place quickly Statement-2 : The catalyst forms an activated complex of lower potential energy, with the reactants by which more number of molecules are able to cross the barrier per unit of time.
Answer» (A) (B) (C ) (D) ANSWER :A

Discussion

41.	STATEMENT-1: +4 oxidation state of Pb is less stable than +2 state. and STATEMENT -2: Pb_(4) is not a stable compound.
Answer» STATEMENT-1 is TRUE, STATEMENT-2 is True, STATEMENT-2 is a CORRECT EXPLANATION for STATEMENT- 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

42.	Statement-1. 50% of a reaction is completed in 50 sec, therefore, 75% of the reaction will be completed in 75 sec. Statement-2. The rate constant of a zero order reaction depends upon time as k=(1)/(t){[A]_(0)-[A]}.
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 :Correct Statement-2. Rate CONSTANT of any reaction is constant at constant temperature and does not CHANGE with time or concentration. However, statement-1 is correct because `t=(1)/(k){[A]_(0)-[A]}` For `50%,t_(50%)=(1)/(k){[A]_(0)-([A]_(0))/(2)}=([A]_(0))/(2k)=50" sec"` For `75%,t_(75%)=(1)/(k){[A]_(0)-([A]_(0))/(4)}` `=([A]_(0))/(k)xx(3)/(4)=([A]_(0))/(2k)xx(3)/(2)=75" sec"`

Discussion

43.	STATEMENT-1 : A catalyst enhances the rate of a reaction and STATEMENT-2 : The energy of activation of the reaction is lowered in presence of a catalyst.
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 :A

Discussion

44.	Statement-1 : 5f orbitals resemble the 4f orbitals in their angular part of the wave-function. Statement-2 : 5f orbitals are not as buried as 4f orbitals and hence 5f electrons can participate in bonding to a far greater extent.
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 and Statement-2 is True. Solution :Both 5f and 4f have `l=3`, so angular PART of WAVE function is SIMILAR.

Discussion

45.	Statement-1: 2A+3B to C 4/3 moles of 'C' are always produced when 3 moles of 'A' & 4 moles of 'B' are added. Statement-2: 'B'is the limiting reactant for the given data.
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 TRUEAND statement-2 is NOT the correct explanation for statement-1 Statement-1 is false, statement -2 is true. Statement -1 is true, statement-2 is false. Answer :C

Discussion

46.	Statement-1: 3M solution of alkali metal in liquid ammonia has copper bronze colour. Statement-2: copper bronze colour is due to the formation of metal cluster.
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 correct explanation for statement-1 Statement-1 is true, statement-2 is FALSE Statement-1 is false, statement-2 is true Answer :A

Discussion

47.	Statement-1: 2-Pentanol and 3-pentanol cannot be distinguished by iodoform test. Stetement-2: 2-Pentanol and 3-pentanol both are secondary alcohols.
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-1. 2-Pentanol can be DISTINGUISHED from 3-pentanol can be distinguished from 3-pentanol by IODOFORM TEST.

Discussion

48.	STATEMENT - 1 : 1,1,1-trideutero-2-priopanol reacts with conc. H_(2)SO_(4)at high temperature to give only one alkene, 3,3,3-trideutero propene. STATEMENT - 2 :C-D bond is stronger than C-H bond.
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 : Breakng of C-H or C-D bond is not RDS so both ALKENE are formed.

Discussion

49.	STATEMENT-1: 1-Butene on reaction with HBr in the presence of peroxide produce 1-bromobutane and STATEMENT-2: It involves the ingormation of primary radical.
Answer» STATEMENT-1 I true, STATENENT-2 is true, STATEMENT-2 is a correct explanation for STATEMENT-1. STATEMENT-1 I true, STATENENT-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 :Addition of HBr in alkene in PRESENCE of peroxide takes place via RADICAL mechanism (secondary FREE radical).

Discussion

50.	Statement-1 : 0.5 M aq. NaOH solution is identical to 2% (w/v) aq. NaOH solution Statement-2 : Concentration in % (w/v) is 4 times the molar concentration for all aqueous solution
Answer» Statement-1 is TRUE, statement -2 is true and statement-2 is correct EXPLANATION for statement-5 Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-5 Statement-1 is false, statement-2 is true Statement-1 is true, statement-2 is false Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Statement -1: alpha-Keratin is a structural protein Statement -2: It is globular protein.

Statement 1 : Al(OH)_(3) is amphoteric in nature statement 2: Al-O and O-H bonds can be broken with equal ease in Al(OH)_(3)

Statement 1: All the halogens are coloured. Statement 2: Halogen molecules absorb some wavelengths of visible light and the electrons are promoted to higher energy molecular orbitals.

Statement-1: All tetrahedral complexes are mainly high spin and the low spin configurations are rarely observed. Statement-2: Delta_(t) is always much smaller even with stronger field ligands and it is never energetically favourable to pair up the electrons.

Statement - 1: All minerals areores. Statement - 2: Oresare mineralsfrom whichmetal canbeextractedconvenientlyand economically.

Statement 1 : All metals can not be obtained by carbon reduction. Statement 2 : Carbon is a strong reducing agent.

Statement-1: All known monouclear complexes of chromium with +3 oxidation state, irrespective of the strength of the ligand must have three unpaired electrons. Statement-2: In complex [Cr(NH_(3))_(4)BrCl]Cl,the 'spin only' magnetic is close to 3.87 BM.

Statement-1: Aldehyde and ketone give nucleophilic addition reactions with carbon oxygen, nitrogen and sulphur nucleophiles. Statement-2: Sulphite ion is ambident nucleophile.

Statement-1: Alcohols gives only substitution products with HX and not elimination product. Statement-2: overline(X) is a very weak which can not abstract proton from alcohol.

Statement-1: Alcohols can not be dried by CaCl_(2). Statement-2: CaCl_(2) forms solvated molecules with alcohols.

STATEMENT-1: Alcino steel is used for making permanent magnets. and STATEMENT-2: Alcino steel is highly magnetic. (A) (B)(C) S (D)

Statement - 1 : Al is used as a reducing agent in aluminothermy. And Statement - 2 : Al has a lower melting point than Fe, Cr and Mn.

Statement 1 : Al is used as a reducing agnet in aluminothermy. Statement 2 : Al has a lower melting point than Fe. Cr and Mn.

STATEMENT-1: AICI_(3) forms dimer Al_(2)CI_(5) but it dissolves in water forming [Al(H_(2)O_(6))^(3+) and CI ions. and STATEMENT-2: Aqueous solution of AICI, is acidic due to hydrolysis.

Statement - 1 : Ag and Au are extracted by leaching their ores with a dilute solution of NaCN. And Statement - 2 : Impurities associated with these ores dissolve in NaCN.

Statement-1 : Adiabatic process must be isentropic process. Statement-II : dS=(dq_("rev"))/T

Statement 1: Addition of bromine to trans-2-butene yields meso-2,3-dibromobutane. Statement 2: Bromine addition to an alkene is an electrophilic addition.

Statement-1: Addition of bromine on trans -2 butene yeilds meso-2,3-dibromo butane. Statement-2: The addition of Br_(2) on double bond is anti-addition.

Statement-1: active mass of pure solid and pure liquid is taken unity. and Statement -2 : The active mass of pure solids and liquids depends on density and molecular mass . The density and molecular mass of pure liquidsand solids are constant.

Statement-1. Addition of Br_(2) to 1-butene gives two optical isomers. Statement-2: The product contains one asymmetric carbon.

Statement 1: Acrylic acid is a weaker acid than benzoic acid. Statement 2: Ethylenic double bond is less electron donating than benzene ring.

Statement 1: Acryaldehyde (CH_(2)=CH-CHO) is oxidised to acrylic acid (CH_(2)==CH-COOH) by Benedict's solution. Statement 2: Benedict's solution is ammoniacal CuSO_(4) solution containing sodium potassium tartarate.

Statement 1: Acrylic acid (CH_(2)=CHCOOH) is a weaker acid than benzoic acid (C_(6)H_(5)COOH). Statement 2: Ethylenic double bond is less electron-donating than benzene ring.

Statement-1: AcidcatalyzeddehydrationfollowsE_(1)mechanismStatement - 2 :Tertiaryalcohols are morereactivethanprimaryalcoholstowards HBr. Statement-3 :Dehydrohalogenation of alkylhalidefollows E_(2) mechanism

Statement-1: Acid catalysed dehydration of t-butanol is faster than n-butanol. Statement-2: The order of stability of carbocation is 3^(@)gt2^(@)gt1^(@).

Statement 1: Aceto acetic ester (CH_(3)COCH_(2)COOC_(2)H_(5)) contains CH_(3)CO gp. But does not give Iodoform test. Statement 2: The H-atoms of the CH_(3) gp. Are more acidic than those of CH_(2)gp.

Statement 1: Acetoacetic ester (CH_(3)COCH_(2)COOC_(2)H_(5)) contains CH_(3)CO group but does not give iodoform test. Statement-2: The H-atoms of the CH_(3) group are more acidic than those of CH_(2) group.

STATEMENT - 1 : Aceticaciddoes not undergo haloform reaction . and STATEMENT - 2 : Acetic acidhas noalpha hydrogen .

Assertion (A): A is very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow precipitate of CdS on passing hydrogen sulphide. Reason (R) : Solubility product of CdS is more than that of NiS.

Statement-1.A sol Sa_(2)S_(3) prepared by the action of H_(2)S on As_(2)O_(3) is negativity charged. Statement-2. It is due to the presence of S^(2-) ions in the diffused layer.

Statement-1. A single C^(12) atom has a mass exactly 12 amu and a mole of these atoms has a mass of exactly 12 grams. Statement-2. A mole of atoms of any element has a mass in grams equal to its atomic mass.

Statement 1 : A mixture of the solutions of a weak acid and its conjugate base is acts as a good buffer. Statement 2 : The ratio of the conjugates base of acid in the mixture does not change substantially when small amount of acids or alkalies are added to the buffer.

STATEMENT - 1 : A mixture of ZnO and CuO can be separated by boiling the mixture with NaOH solution. and STATEMENT - 2 : ZnO dissolves in NaOH solution while CuO remains undissolved.

Statement-1. A low level of noradrenaline in the body causes depression. Statement-2. Antidepressant drugs catalyse the degradation of noradrenaline.

Statement-1: A fractional order reaction must be a complex reaction. Statement-2 : Fractional order of RDS equals to

Statement-1 : A decrease in pressure leads to an increase in freezing point of water. Statement-2 : For ice on melting volume decreases.

STATEMENT - 1 : A dark blue colour is obtained on adding excess of dilute NH_(4)OH solution in aqueous soluiton of copper sulphate. and STATEMENT - 2 : Dark blue colour is due to the formation of [Cu(NH_(3))_(4)]^(2+) complex ion.

STATEMENT-1: +4 oxidation state of Pb is less stable than +2 state. and STATEMENT -2: Pb_(4) is not a stable compound.

Statement-1. 50% of a reaction is completed in 50 sec, therefore, 75% of the reaction will be completed in 75 sec. Statement-2. The rate constant of a zero order reaction depends upon time as k=(1)/(t){[A]_(0)-[A]}.

STATEMENT-1 : A catalyst enhances the rate of a reaction and STATEMENT-2 : The energy of activation of the reaction is lowered in presence of a catalyst.

Statement-1 : 5f orbitals resemble the 4f orbitals in their angular part of the wave-function. Statement-2 : 5f orbitals are not as buried as 4f orbitals and hence 5f electrons can participate in bonding to a far greater extent.

Statement-1: 2A+3B to C 4/3 moles of 'C' are always produced when 3 moles of 'A' & 4 moles of 'B' are added. Statement-2: 'B'is the limiting reactant for the given data.

Statement-1: 3M solution of alkali metal in liquid ammonia has copper bronze colour. Statement-2: copper bronze colour is due to the formation of metal cluster.

Statement-1: 2-Pentanol and 3-pentanol cannot be distinguished by iodoform test. Stetement-2: 2-Pentanol and 3-pentanol both are secondary alcohols.

STATEMENT - 1 : 1,1,1-trideutero-2-priopanol reacts with conc. H_(2)SO_(4)at high temperature to give only one alkene, 3,3,3-trideutero propene. STATEMENT - 2 :C-D bond is stronger than C-H bond.

STATEMENT-1: 1-Butene on reaction with HBr in the presence of peroxide produce 1-bromobutane and STATEMENT-2: It involves the ingormation of primary radical.

Statement-1 : 0.5 M aq. NaOH solution is identical to 2% (w/v) aq. NaOH solution Statement-2 : Concentration in % (w/v) is 4 times the molar concentration for all aqueous solution