94420 + Interview Questions in Chemistry in Class 12

1.	Statement-1: Chloroacetaldehyde is more reactive than acetaldehyde for nucleophilic addition reaction. Statement-2: I group in carbonyl compound makes carbonyl carbon more electron deficient.
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

2.	Statement-1. Cimetidine is an antacid. Statement-2. It prevents the interaction of histamine thereby producing less hydrochloric acid in the stomach.
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

3.	Statement-1: Charge on the complex of ferric ion with EDTA is minus one. Statement-2: EDTA is a hexadentate 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 :`[FE (EDTA)]^(-)`

Discussion

4.	STATEMENT-1: CH_(3)MgClissigma organometallic complex . and STATEMENT-2: In ether RMgCl , co-ordination number of Mg is 6 .
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

5.	Statement-1. CH_(3)Br+AgCN to CH_(3)NC +AgBr. Statement-2. CN^(-) is an ambident ion.
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 explanation. AGCN is a covalent moelcule and hence attack occurs through the lone pair of ELECTRONS present on the nitrogen ATOM.

Discussion

6.	STATEMENT-1 : CH_(3) COCH_(2) CO OC_(2)H_(5)will give iodoform test . and STATEMENT - 2 : ItcontainsCH_(3)COgroup linkedto a carbonatom .
Answer» STATEMENT - 1 is TRUE, STATEMENT - 2 is True ,STATEMENT - 2 is a correct explanationfor STATEMENT - 1 STATEMENT -1IS True, STATEMENT - 2 is True , STATEMENT - 2 is NOTA correctexplanationfor STATEMENT - 1 STATEMENT-1is True , STATEMENT - 2 is False STATEMENT - 1is False, STATEMENT - 2 is True . Answer :D

Discussion

7.	Statement-1: CF_(3)-CHCl_(2) when treated with C_(2)H_(5)OD, the major product formed is CF_(3)-CDCl_(2) rather than CF_(2)=C Cl_(2) Statement-2: C_(2)H_(5)O^(-) is a poor base.
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 :`C_(2)H_(5)O^(-)` is a very powerfull BASE.

Discussion

8.	Statement 1 : Ce^(3+) has the tendency to charge to Ce^(4+). Statement 2 : Ce^(3+) used as an oxidizing agent in volumetric analysis.
Answer» Statememt 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 si not a correct explanation for statement 4 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is ture Solution :`Ce^(4+)` has the tendency to change to `Ce^(3+)` (as `+3` oxidation state is more STABLE).

Discussion

9.	Statement-1 : Ce^(4+) can oxidise water. statement-2 : Ce^(4+) is a good analytical reagent.
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 :Oxidation of WATER is very SLOW so `Ce^(4+)` is a GOOD, analytical reagent.

Discussion

10.	STATEMENT - 1 : CdS and As_(2)S_(3) are coloured compounds. and STATEMENT - 2 - : CdS and As_(2)S_(3) can be separated by ammonium sulphide.
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 :B

Discussion

11.	Statement-1. Ce^(3+)has the tendency to change to Ce^(4+) Statement-2. Ce^(3+) has the tendency to change to Ce^(4+).
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-2. `CE^(4+)` has the tendency to CHANGETO `Ce^(3+)` ( as `+3` oxidation STATEIS more stable).

Discussion

12.	STATEMENT - 1 : Carboxylic acidsreact with diazomethane . and STATEMENT-2 : TheCH_(2)groupof diazomethancebecomes the o-melthylgroup of esters.
Answer» STATEMENT -1 is TRUE, STATEMENT -2IS True , STATEMENT -2is a correctexplanationfor STATEMENT- 1 STATEMENT -1 is True,STATEMENT- 2 is True , STATEMENT- 2 is True ,STATEMENT-2 is NOT a correctexplanationfor STATEMENT -1 STATEMENT - 1 isTrue, STATEMENT -2 is False STATEMENT -1 is False , STATEMENT -2 is True Answer :A

Discussion

13.	Statement-1 : Catalyst does not change the Delta H value of the reaction. Statement-2 : Catalyst are generally added in very small quantities and not stoichiometrically.
Answer» (A) (B) (C ) (D) ANSWER :B

Discussion

14.	Statement-1: Carbonyl compound gives addition followed by elimination reaction with NH_(2)-G Statement-2: Addition followed by elimination reaction is catalysed by acid as well as base.
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 :C

Discussion

15.	STATEMENT-1: Carborundum is used as an abrasive. and STATEMENT-2: Its structure is similar to diamond.
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 TATEMENT-1 is True, STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True. Answer :B

Discussion

16.	Statement-1: Carbon is not used as a reducing agent for the extraction of group 2 metals. Statement-2: Carbon reacts with group 2 metal to give carbides
Answer» Statement -1 is TRUE, Statement-2 are true and Statement-2 is the CORRECT explanation of Statement -1 Statement -1 is true, Statement-2 are true and Statement-2 is not a correct explanation of Statement -1 Statement-1 is true but Statement -2 is FALSE Statement-1 is false but Statement -2 is true Answer :a

Discussion

17.	Statement-1: Carbocationic rearrangement is known as electrophilic rearrangement and Statement-2: Carbocations are stabilized by both hyperconjugation and +I effect.
Answer» ANSWER :D

Discussion

18.	Statement-1: Butan-2-ol is optically active. Statement-2. Its mirror image is non-superimposable on it.
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

19.	STATEMENT-1: Both CO_(2) and SiO_(2) have same structure. and STATEMENT-2: CO_(2) is a gas while SIO_(2) is a crystalline compound.
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

20.	Statement-1: Bond length of (O-O) in O_(2)F_(2) is shorter than that H_(2)O_(2). And Statement-2: H_(2)O_(2) is an ionic compound.
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-2 Statement -1 is true, statement -2 is false Statement-1 is false, Statement-2 is true. Answer :D

Discussion

21.	STATEMENT - 1 :Boiling point of ethanol is more than ethylene glycol. STATEMENT - 2 : Ethylene glycol forms intramolecular H-bonding.
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

22.	Between SiCl_(4) and C Cl_(4), only SiCl_(4) reacts with water. SiCl_(4) is ionic and C Cl_(4) is covalent.
Answer» Statement 1 is true, statement 2 is true, statement 2 SI a correct explanation for statement 7 Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 7 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :`SiCl_(4)` undergoes hydrolysis due to the presence of empty d orbitals in the valence shell of Si, while C has no vacant d orbitals to ACCOMMODATE electron PAIRS donated by water molecules during hydrolysis.

Discussion

23.	Statement 1: Benzyl amine on reaction with NaNO_(2)//HCl followed by beta-Naphthol in slight basic medium forms a coloured dye. Statement 2: Stable diazonium salts can form coloured dye with highly activated aromatic compounds
Answer» Solution :Only AROMATIC AMINE shows COUPLING reaction.

Discussion

24.	Statement 1: Benzonitrile is prepared by the reaction of chlorobenzene with potassium cyanide. Statement 2: Cyanide (CN) is a strong nucleophile.
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

25.	Statement 1: Basic radical of V group are precipitated as their carbonates in presence of NH_(4)Cl Statement 2: NH_(4)OH maintains the pH of the solution basic.
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 :Group reagent for V group is `(NH_(4))_(2)CO_(3)` in presence of `NH_(4)Cl` and because of `NH_(4)OH,pH` of solution is maintained.

Discussion

26.	Statement-1: Avogadro's number is a dimensionless quantity. because Statement-2: It is a number of atoms or molecules in one gram mole.
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 :B

Discussion

27.	Statement-1 : B_(2)O_(3) is more acidic than BeO. Statement-2 : Ionisation energy of B is more than Be.
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

28.	STATEMENT-1: Autoprotolysis constant of water increases with the increase in temperature. STATEMENT-2: When a solution of a weak monobasic acid is titrated wita a strong base, at half neutralization point pH=pK_(a)+1. STATEMENT-3: The pH of 10^(-8) m HCl is 8.
Answer» F F T T F F F T T T T T ANSWER :B

Discussion

29.	Statement-1: Auto reduction of ores is used for cinnabar, copper glance and Galena ores Statement-2:The sulphide ores of these metals react with their oxides to give metal are less reactive than copper.
Answer» STATEMENT -1 is true, Statement-2 are true and Statement-2 is the correct EXPLANATION of Statement -1 Statement -1 is true, Statement-2 are true and Statement-2 is not a correct explanation of Statement -1 Statement-1 is true but Statement -2 is FALSE Statement-1 is false but Statement -2 is true Answer :a

Discussion

30.	Statement-1. Aspirin is a narcotic analgesic. Statement-2. It inhibits the synthesis of prostaglandins.
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-1. Aspirin is a non-narcotic ANALGESIC

Discussion

31.	Statement 1 : Artificial radioisotopes are obtained from stable nuclei whereas it is not so for natural radioisotopes. Statement 2 : Radioisotopes obtained by artifical transmutation do not behave in the same way as the natural radioactive elements
Answer» Statement 1 is true, statement 2 is true , statement 2 is a CORRECT explanation for statement 3 Statement 1 is true, Statement 2 is true, statement 2 is not a correct explanation for statement 3 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :Radioisotopes obtained by artifical transmutation BEHAVE exactly in the same way as natural RADIOACTIVE ELEMENTS

Discussion

32.	Statement 1: Aromatic aldehydes can be distinguished from aliphatic aldehydes by Fehling solution. Statement 2: Fehling solution in an alkaline solution of CuSO_(4) containing Rochelle salt.
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 explanation. Aliphatic aldehdyes reduce FEHLING's solution but aromatic aldehydes do not.

Discussion

33.	Statement 1: Arenediazonium salts are stable at freezing temperatures. Statement 2: Due to resonance between pi bond of Benzene -overset(o+)N-=N stability is attained.
Answer» SOLUTION :

Discussion

34.	Statement-1: Aqueous CuSO_(4) solution on reaction with excess of aqueous KCN forms K_(3)[Cu(CN)_(4)]. Statement-2: CuS is obtained when H_(2)S(g) is passed through K_(3)[Cu(CN)_(4)]
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 :`K_(3)[Cu(CN)_(4)]` is a perfect COMPLEX w.r.t. `H_(2)S`.

Discussion

35.	Statement-1: Anisole undergoes electrophilic substitution at o- and p-positions. Statement-2: Anisole is less reactive than phenol towards electrophilic substitution reactions.
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. `OCH_(3)` GROUP is o,p-directing.

Discussion

36.	Statement-1. Any concentration of NaCl solution can be injected intravenously as NaCl, being a common table salt, is harmless chemical. Statement-2. 0.9% (mass/volume) NaCl solution is isotonic with the fluid inside the blood cells.
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. Only `0.9%` NaCl solution can be injected intravenously because it is isotonic with the fluid inside the blood cells, otherwise they willshrink or SWELL.

Discussion

37.	Statement 1: Aniline on reaction with NaNO_(2)//HCl at 0^(@)C followed by coupling with beta- Naphthol gives a dark blue precipitate. Statement 2: The colour of the compound formed in the reaction of aniline with NaNO_(2)//HCl at 0^(@)C followed by coupling with beta-naphthol is due to the extended conjugation.
Answer» ANSWER :D

Discussion

38.	Statement-1: Aniline racts with bromine water to form 2,4,6-tribromoaniline. Statement-2: Aniline is resonance stabilized.
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 explanation. The strong electron-donating effect of the `NH_(2)` group ACTIVATES p-and both the o-positions.

Discussion

39.	Statement 1: Anisole undergoes electrophilic substitution at o- and p- position Statement 2: Anisole is less reactive than phenol towards electrophilic substitution reactions.
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 Statement1 is true, statement 2 is false Statement 1 is true, statement 2 is true Solution :Due to+R-effect , methoxy group increass ELECTRON density at o- and p-positions.

Discussion

40.	Statement-1: Aniline on reaction with NaNO_(2)//HCl at 0^(@)C followed by coupling with beta-naphthol gives a dark blue coloured precipitate. Statement-2: The colour of the compound formed in the reaction of aniline with NaNO_(2)//HCl at 0^(@)C followed by coupling with beta-naphthol is due to extended conjugation.
Answer» Statement-1 is TRUE, statement-2 is true, statement-2 is a CORRECT explanation for statement-1 Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1 Statement-1 is true, statement-2 is FALSE Statement-1 is false, statement-2 is true Solution :Correct statement-1: Aniline reacts with `NaNO_(2)//HCL` at `0^(@)C` followed by coupling with `beta`-naphthol to give an orange red coloured precipitate.

Discussion

41.	Statement-1: And Statement-2: Lone pair electrons on nitrogen in compound (I) does not participate in resonance.
Answer» STATEMENT-1 I TRUE, statement-2 is true, statement-2 is a CORRECT EXPLANATION for statement-1 Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1. Statement-1 is true, statement-2 is FALSE. statement-1 is false, statement, statement-2 is true. Answer :A

Discussion

42.	Statement-1 : An adiabatic closed systemmay be an isolated system. Statement-2 : Irreversible process is an isobaric process. Statement-3 : At constant temperature change in internal energy of real gas is equal to zero. Statement-4 : molar heat capacity at constant pressure (C_(p.m)) is a path function.
Answer» TFFF FTTF TTTF TFTT Solution :`k=(k_(1)k_(3))/(k_(2)),Ae^(-)(E_(a))/(RT)=(Ae^(-(E_(1))/(RT))xxAe^(-(E_(3))/(RT)))/(Ae^(-(E_(2))/(RT))),E_(a)=E_(1)+E_(3)-E_(2)=4+2-3=3kJ`

Discussion

43.	Statement-1 : An exothermic reaction, nonspontaneous at high temperature, may become spontaneous at low temperature. Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.
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-I is FALSE, statement-2 is true. Statement-1 is true, statement-2 is false. Answer :C

Discussion

44.	Statement-1: Among the complexes [Fe(CN)_(6)]^(4-)" and "[Fe(NH_(3))_(6)]^(2+), former complex absorbs the light of shorter wavelength. Statement-2: The crystal field splitting depends upon the strength of the ligands and charge on the metal ion.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is a correct EXPLANATION for Statement-1. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1. Statement-1 is True, Statement-2 is FALSE. Statement-1 is False, Statement-2 is True. Solution :STRENGTH of ligand field as `CN^(-) gt NH_(3)` `Delta_(0)` for `CN^(-)` complex `gt` `NH_(3)` complex. `Delta_(0)prop1/(lamda_(ABS))`

Discussion

45.	Statement 1 : Ammonical silver nitrate converts glucose to gluconic acid and metallic silver is precipitated. Statement 2 : Glucose acts as a weak reducing agent.
Answer» Statememt 1 is true, statement 2 is true , statement 2 is a correct explanation for statement 5 Statement 1 is true, statement 2 is true , statement 2 SI not a correct explanation for statement 5 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is ture Solution :`Ag_(2)O+C_(6)H_(12)O_(6)rarr 2Ag+C_(6)H_(12)O_(7)`

Discussion

46.	Statement 1: Ammonium phosphomolybdate is a yellow compound. Statement 2: If yellow precipitate is obtained on adding ammonium molybdate solution on boiling then phosphate radical is identified.
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 :On mild HEATING (temp. should not be greater than `40^(@)C`) ammonium molybdate with phosphate radical in presence of conc. `HNO_(3)`, yellow ppt. is OBTAINED `(NH_(4))_(3)PO_(4)*12MoO_(3)("yellow ppt.")`

Discussion

47.	Statement-1. Ambidentate ligands lead to linkage isomerism. Statement-2. The ionization sphere is different in different linkage isomers.
Answer» Statement-1 is True, Statement-2 is True , Statement-2 is a CORRECT explanation for Statement-5 Statement-1 is True, Statement is 2 is True , Statement-2 is NOT a correct explanation for Statement-5 Statement-1 is True, Statement-2 is False Statement-1 is False, Statement-2 is True Solution :Correct Statement-2 The DONOR atom linking to the central metal atom is DIFFERENT in different linkage ISOMERS.

Discussion

48.	Statement-1: Aluminium is used as reducing agent in the commercial extraction of iron from haematite ore. Statement--2: Reduction of B_(2)O_(3) to boron by aluminuim is called as Goldschmidt aluminothermicprocess.
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 not a correct explantion for Statement-1. Statement-1 is True, Statement-2 is False. Statement-1 is True, Statement-2 is True. Answer :D

Discussion

49.	STATEMENT-1: Aluminium is used as a reducing agent in thermite process. And STATEMENT-2: Aluminium can reduce Na_(2)Oto sodium.
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-t is True. STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True: Answer :C

Discussion

50.	Statement -1 : Although NaH_(2)PO_(2) contains two H-atoms, it is not an acid salt. Satement -2 : It contains two ionisable hydrogens.
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. `NaH_(2)PO_(2)` does not have any ionizable HYDROGENS.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Statement-1: Chloroacetaldehyde is more reactive than acetaldehyde for nucleophilic addition reaction. Statement-2: I group in carbonyl compound makes carbonyl carbon more electron deficient.

Statement-1. Cimetidine is an antacid. Statement-2. It prevents the interaction of histamine thereby producing less hydrochloric acid in the stomach.

Statement-1: Charge on the complex of ferric ion with EDTA is minus one. Statement-2: EDTA is a hexadentate ligand.

STATEMENT-1: CH_(3)MgClissigma organometallic complex . and STATEMENT-2: In ether RMgCl , co-ordination number of Mg is 6 .

Statement-1. CH_(3)Br+AgCN to CH_(3)NC +AgBr. Statement-2. CN^(-) is an ambident ion.

STATEMENT-1 : CH_(3) COCH_(2) CO OC_(2)H_(5)will give iodoform test . and STATEMENT - 2 : ItcontainsCH_(3)COgroup linkedto a carbonatom .

Statement-1: CF_(3)-CHCl_(2) when treated with C_(2)H_(5)OD, the major product formed is CF_(3)-CDCl_(2) rather than CF_(2)=C Cl_(2) Statement-2: C_(2)H_(5)O^(-) is a poor base.

Statement 1 : Ce^(3+) has the tendency to charge to Ce^(4+). Statement 2 : Ce^(3+) used as an oxidizing agent in volumetric analysis.

Statement-1 : Ce^(4+) can oxidise water. statement-2 : Ce^(4+) is a good analytical reagent.

STATEMENT - 1 : CdS and As_(2)S_(3) are coloured compounds. and STATEMENT - 2 - : CdS and As_(2)S_(3) can be separated by ammonium sulphide.

Statement-1. Ce^(3+)has the tendency to change to Ce^(4+) Statement-2. Ce^(3+) has the tendency to change to Ce^(4+).

STATEMENT - 1 : Carboxylic acidsreact with diazomethane . and STATEMENT-2 : TheCH_(2)groupof diazomethancebecomes the o-melthylgroup of esters.

Statement-1 : Catalyst does not change the Delta H value of the reaction. Statement-2 : Catalyst are generally added in very small quantities and not stoichiometrically.

Statement-1: Carbonyl compound gives addition followed by elimination reaction with NH_(2)-G Statement-2: Addition followed by elimination reaction is catalysed by acid as well as base.

STATEMENT-1: Carborundum is used as an abrasive. and STATEMENT-2: Its structure is similar to diamond.

Statement-1: Carbon is not used as a reducing agent for the extraction of group 2 metals. Statement-2: Carbon reacts with group 2 metal to give carbides

Statement-1: Carbocationic rearrangement is known as electrophilic rearrangement and Statement-2: Carbocations are stabilized by both hyperconjugation and +I effect.

Statement-1: Butan-2-ol is optically active. Statement-2. Its mirror image is non-superimposable on it.

STATEMENT-1: Both CO_(2) and SiO_(2) have same structure. and STATEMENT-2: CO_(2) is a gas while SIO_(2) is a crystalline compound.

Statement-1: Bond length of (O-O) in O_(2)F_(2) is shorter than that H_(2)O_(2). And Statement-2: H_(2)O_(2) is an ionic compound.

STATEMENT - 1 :Boiling point of ethanol is more than ethylene glycol. STATEMENT - 2 : Ethylene glycol forms intramolecular H-bonding.

Between SiCl_(4) and C Cl_(4), only SiCl_(4) reacts with water. SiCl_(4) is ionic and C Cl_(4) is covalent.

Statement 1: Benzyl amine on reaction with NaNO_(2)//HCl followed by beta-Naphthol in slight basic medium forms a coloured dye. Statement 2: Stable diazonium salts can form coloured dye with highly activated aromatic compounds

Statement 1: Benzonitrile is prepared by the reaction of chlorobenzene with potassium cyanide. Statement 2: Cyanide (CN) is a strong nucleophile.

Statement 1: Basic radical of V group are precipitated as their carbonates in presence of NH_(4)Cl Statement 2: NH_(4)OH maintains the pH of the solution basic.

Statement-1: Avogadro's number is a dimensionless quantity. because Statement-2: It is a number of atoms or molecules in one gram mole.

Statement-1 : B_(2)O_(3) is more acidic than BeO. Statement-2 : Ionisation energy of B is more than Be.

STATEMENT-1: Autoprotolysis constant of water increases with the increase in temperature. STATEMENT-2: When a solution of a weak monobasic acid is titrated wita a strong base, at half neutralization point pH=pK_(a)+1. STATEMENT-3: The pH of 10^(-8) m HCl is 8.

Statement-1: Auto reduction of ores is used for cinnabar, copper glance and Galena ores Statement-2:The sulphide ores of these metals react with their oxides to give metal are less reactive than copper.

Statement-1. Aspirin is a narcotic analgesic. Statement-2. It inhibits the synthesis of prostaglandins.

Statement 1 : Artificial radioisotopes are obtained from stable nuclei whereas it is not so for natural radioisotopes. Statement 2 : Radioisotopes obtained by artifical transmutation do not behave in the same way as the natural radioactive elements

Statement 1: Aromatic aldehydes can be distinguished from aliphatic aldehydes by Fehling solution. Statement 2: Fehling solution in an alkaline solution of CuSO_(4) containing Rochelle salt.

Statement 1: Arenediazonium salts are stable at freezing temperatures. Statement 2: Due to resonance between pi bond of Benzene -overset(o+)N-=N stability is attained.

Statement-1: Aqueous CuSO_(4) solution on reaction with excess of aqueous KCN forms K_(3)[Cu(CN)_(4)]. Statement-2: CuS is obtained when H_(2)S(g) is passed through K_(3)[Cu(CN)_(4)]

Statement-1: Anisole undergoes electrophilic substitution at o- and p-positions. Statement-2: Anisole is less reactive than phenol towards electrophilic substitution reactions.

Statement-1. Any concentration of NaCl solution can be injected intravenously as NaCl, being a common table salt, is harmless chemical. Statement-2. 0.9% (mass/volume) NaCl solution is isotonic with the fluid inside the blood cells.

Statement-1: Aniline racts with bromine water to form 2,4,6-tribromoaniline. Statement-2: Aniline is resonance stabilized.

Statement 1: Anisole undergoes electrophilic substitution at o- and p- position Statement 2: Anisole is less reactive than phenol towards electrophilic substitution reactions.

Statement-1: And Statement-2: Lone pair electrons on nitrogen in compound (I) does not participate in resonance.

Statement-1 : An exothermic reaction, nonspontaneous at high temperature, may become spontaneous at low temperature. Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.

Statement-1: Among the complexes [Fe(CN)_(6)]^(4-)" and "[Fe(NH_(3))_(6)]^(2+), former complex absorbs the light of shorter wavelength. Statement-2: The crystal field splitting depends upon the strength of the ligands and charge on the metal ion.

Statement 1 : Ammonical silver nitrate converts glucose to gluconic acid and metallic silver is precipitated. Statement 2 : Glucose acts as a weak reducing agent.

Statement 1: Ammonium phosphomolybdate is a yellow compound. Statement 2: If yellow precipitate is obtained on adding ammonium molybdate solution on boiling then phosphate radical is identified.

Statement-1. Ambidentate ligands lead to linkage isomerism. Statement-2. The ionization sphere is different in different linkage isomers.

Statement-1: Aluminium is used as reducing agent in the commercial extraction of iron from haematite ore. Statement--2: Reduction of B_(2)O_(3) to boron by aluminuim is called as Goldschmidt aluminothermicprocess.

STATEMENT-1: Aluminium is used as a reducing agent in thermite process. And STATEMENT-2: Aluminium can reduce Na_(2)Oto sodium.

Statement -1 : Although NaH_(2)PO_(2) contains two H-atoms, it is not an acid salt. Satement -2 : It contains two ionisable hydrogens.