94420 + Interview Questions in Chemistry in Class 12

1.	Statement-1: Specific conductivity of an electrolytic solution decreases with dilution whereas molar conductivity. Statement-2: Specific conductivity is the conductance of a specific amount of the electrolyte whereas molar conductivity is for 1 mole of the electrolyte.
Answer» Statement-1 is True, statement-2 is true, statement-2 is a correct EXPLANATION of statement-1 Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation of statement-1. Statement-1 is true, statemet-2 is FALSE Statement-1 is false, statement-2 is true Solution :Correct Statement-2. SPECIFIC conductivity is the conductance of 1 `cm^(3)` of the solution whereas molar conductivity is the conductance of a solution contining 1 mole of the ELECTROLYTE.

Discussion

2.	Statement-1: Solubility on n-alcohol in water decreases with increse in molecular weight. Statement-2: The hydropbobic nature of alkyl chain increases.
Answer» Statement-1 is TRUE, Statement-2 is True, Statement-2 is 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 Answer :C

Discussion

3.	STATEMENT-1: Sodium thiosulphate is used in photography and STATEMENT-2: Sodium thiosulphate is photosensitive.
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

4.	Statement-1: Sodium chloride is added during electrolysis of fused anhdrous magnesium chloride. Statement-2: Anhydous magnesium chloride is obtained by heating hydrated magnesium chloride, MgCl_(2).6H_(2)O
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 :c

Discussion

5.	Statement 1: Snow does not melt at monutains easily. Statement 2: A decrease in pressure leads to an increase in freezing point of water.
Answer» Statement 1 is true, STETEMENT 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 :As ice `HARR` WTER equlibrium.

Discussion

6.	STATEMENT-1 S_(N)2 reaction is carried out in the presence of polar aprotic solents and . STATEMENT-2: Polar aprotic solvent doesnot contain acidic hydrogen
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-1True, Statement-2 is False Statement-1False, Statement-2 ISTRUE, ANSWER :B

Discussion

7.	Statement-1. Small quantity of soap is used to prepare a stable emulsion. Statement-2. Soap lowers the interfacial tension between oil and water.
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. Answer :A

Discussion

8.	STATEMENT-1 S_(N)1 reaction is comied out in the presence of polar protic solvent and STATEMENT-2 : Polar protic solvent increases stability of carboncation due to the solvation.
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-1True, Statement-2 is False Statement-1False, Statement-2 ISTRUE, ANSWER :A

Discussion

9.	Statement 1: Schiff's regent is a dilute solution of rosaniline hydrochloride in water whoce magneta colour is discharged with aqueous SO_(2) or H_(2)SO_(3). Statement 2: Schiff's reagent oxidies benzaldehyde to benzoic acid.
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 :Schiff's or Fehling's or Benedict's solutions are weak oxidising agents, hence they oxidise only aliphatic aldehydes, but BENZALDEHYDE `(PhCHO)` is AROMATIC ALDEHYDE. So, statement `1` is true but statement `2` is false.

Discussion

10.	Statement-1: Silica is added as a flux in reverberatory furnance, in the extraction of copper from copper pyrites. Statement-2: Silica decreases the melting point of the ore and remove the impurity of lead sulphide as PbSiO_(3)
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 :c

Discussion

11.	Statement1: Ring test for nitrates is performed from the Na_(2)CO_(3) extract of the salt solution. Statement 2: All nitrates are soluble in water.
Answer» STATEMENT -1is True, Statement -2 is True , Statement -2 is a correct EXPLANATION for Statement -1. Statement -1 is True, Statement-2 is Ture, 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

12.	Statement-1: Sb_(2)S_(3) is not soluble in yellow ammonium sulphide. Statement-2: the common ion effect due to S^(2-) ions reduces the solubility of SbS_(3).
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 :`t`-ALKYL HALIDES gives eleimination.

Discussion

13.	Statement -1 : Salts of ClO_(3)^(-) and ClO_(4)^(-) are well known but those of FO_(3)^(-) and FO_(4)^(-) are unknown. Satement - 2 : F is more electronegative than O while Cl is less electronegative than O.
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. F cannot show positive oxidation states of +5 and +7 and hence `FO_(3)^(-) and FO_(4)^(-)` are unknown.

Discussion

14.	STATEMENT - 1 : Result of victor Meyer test 1^(@) ROH-Red colour 2^(@) ROH - Blue colour 3^(@) ROH - white or no colour STATEMENT - 2 : Victor Meyer test is a method for separtions of 1^(@),2^(@) and 3^(@) alcohol.
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

15.	Statement-1 : Rate of nitration is C_(6)H_(6) cong C_(6) D_(6) cong C_(6)T_(6) Statement-2 : Formation of wheland intermediate is rate determining step in nitration of benzene, not the breaking of C–H or C–D bond.
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 correctexplanation for STATE- ment-1 Statement-1 is true, statement-2 is FALSE Statement-1 is false, statement-2 is true Answer :A

Discussion

16.	STATEMENT-1 Reaction between sodium tertbutoxide and ethyllodide doesnot produce ether and STATEMENT-2 : Sodium tert butoxide is very strong base but it is not a 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-1True, Statement-2 is False Statement-1False, Statement-2 ISTRUE, ANSWER :A

Discussion

17.	Statement-1: Reaction of disodium hydrogen phosphate with magnesium sulphate in presence of ammonium hydroxide gives a white crystalline precipitate. Statement-2:Insoluble magnesium ammonium phosphate is formed.
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 :`MgSO_4` on REACTION with `Na_2HPO_4` in presence of `NH_4OH` GIVES white PRECIPITATE of `Mg(NH_4)PO_4` `MgSO_4 + Na_2HPO_4 + NH_4OH to Mg(NH_4)PO_4 darr + Na_2SO_4+H_2O`

Discussion

18.	Statement-1: Reaction of t-butyl chloride on Wurtz reaction gives alkene. Statement-2: t-butyl chloride on Wurtz reaction gives alkene.
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 :`(CH_(3))_(3)CBr overset(Na)to(CH_(3))_(2)C=Cl_(2)`

Discussion

19.	STATEMENT - 1 : Rate of reaction with Lucas reagent is C-overset(OH)overset(\|)C-CgtC-C-OHgtC-OH STATEMENT - 2 : Lucas reagent reacts with all alcohol byS_(N)1mechanism and rate prop stability of carbocation.
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 :Correct rate is `C-overset(OH)overset(\|)C-CgtC-OHgtC-C-OH" "1^(@)` acohol REACTS with `S_(N)2` mechanism so `"rate"prop(1)/("steric hindrance")`

Discussion

20.	Statement-1 : rate of dehydration. Statement-2: Rate of dehydration is directly proportional to stability of carbocation
Answer» STATEMENT -I 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

21.	Statement-1 : Rate of a chemical reaction increases as the temperature is increased. Statement-2 : As the temperature is increased fraction of molecules occupying E_(T) or more increases.
Answer» (A) (B) (C ) (D) ANSWER :B

Discussion

22.	Statement-1. Rate constant of a zero order reaction has same units as the rate of reaction. Statement-2. Rate constant of a zero order reaction does not depend upon the units of concentration.
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. `k="CONC."//"TIME = mol L"^(-1)s^(-1)`, i.e., it depends UPON UNITS of CONCENTRATION.

Discussion

23.	Statement-1. Ranitidine is used to treat hyperacidity while brompheniramine is used to treat hypersensitivity. Statement-2. Both the drugs are antihistamines.
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 explanation . ALTHOUGH both ranitidine and brompheniramine are antihistamines, YET they act on different receptors andhence produce different chemotherapeutic EFFECTS.

Discussion

24.	which is/are statement is correct.Statement-1: R_(2)SiCl_(2) is the starting material for linear polymer of silicone. Statement-2: R_(2)SiCl_(2) is the starting material for 3-D polymer of silicone. Statement-3: R_(3)SiCl is the starging material for 3-D polymerr of silicone.
Answer» ANSWER :A

Discussion

25.	Statement 1: R-CH=CH_(2)overset(C Cl_(3)Br)underset("Peroxide")tooverset(Br)overset(\|)(RCH)-CH_(2)C Cl_(3) Statement-2: The addition obey free radical addition on alkenes in presence of peroxide.
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 :Explanation is correct REASON for statement.

Discussion

26.	Statement- 1Pyridiniumchlorochromate canconvertprimaryalcoholsintocorrespondingaldehyde Statement -2MnO_(2)can oxidizebenzylicalcoholintocorrespondingcarboxylicacid Statement- 3 :OsO_(4) canconvert alkeneintotrans1,2- diol
Answer» FFF TTT TTF TFF Solution :NA

Discussion

27.	STATEMENT-1: Quenched steel is very hard and brittle. and STATEMENT-2: During quenching, steel is heated to a temperature well below red hot.
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

28.	Statement 1 : Proton -proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons in heavier nuclides Statement 2 : The plot of atomic number (y-axis) veruse number of neutrons (x-axis) for stable nuclei shows a curvature towards x-axis from the line of 45^(@) slope as the atomic number is increased.
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 : With INCREASE in atomic no. `(Z gt 20)`, no. of NEUTRONS increases more than th eno. of protons. So a curvature is observed as SHOWN. Hence, Statement -1 is correct. The STABILITY of heavier nuclides is due to the fact that attractive FORCES between protons and neutrons overcome the proton-proton electrostatic repulsions. Hence, Statement -2 is false

Discussion

29.	STATEMENT-1: Pressure exerted by a real gas is lesser than that exerted bý an ideal gas under similar conditions. and STATEMENT-2: At high pressure repulsive forces dominate in real gases.
Answer» STATEMENT-1 is TRUE, STATEMENT-2 is True, STATEMENT-2 is CORRECT EXPLANATION for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1 STATEMENT-1 is True, STATEMENT-2 is FALSE STATEMENT-1 is False, STATEMENT-2 is True Answer :D

Discussion

30.	STATEMENT - 1 : Propan -2, 2-diol is unstable. STATEMENT - 2 : Repusion between lone pairs of electron of two OH groups makes its unstable.
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

31.	Statement-1: Potassium ferrocyanide is diamagnetic where as potassium ferricyanide is paramagnetic . Statement-2: Crystal field spletting in ferrocyanide ion is greater than that of ferricyanide 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 :CFSE DUE to `Fe_(3+) gt Fe^(2+)` (for same set of ligands).

Discussion

32.	Statement-1. Polyester is a copolymer. Statement-2 The repeating structural unit of polyester is derived from two types of monomer units , ethylene glycol and terephthalic 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. Answer :A

Discussion

33.	Statement -1: Potassium can not obtained by the electrolysis of fused KCL.And Statement -2: Potassium has high reactivity at the melting point of KCl.
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-5 Statement -1 is true, statement -2 is false Statement-1 is false, Statement-2 is true. ANSWER :B

Discussion

34.	Statement -1: PMMA is used for making lenses and light covers Statement -2: It has excellent light transmission properties.
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 Answer :A

Discussion

35.	Statement - 1 : Platinum and gold occur in native state in nature. And Statement - 2 : Platinum and gold are noble metals.
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

36.	Statement - 1 : Pine oil is fused as a foaming agent in froth floatating process. And Statement - 2 : Adsorption principle is involved in froth floatating process.
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

37.	Statement 1: Phenol is more reactive than benzene towards electrophilic substitution reaction. Statement 2: In the case of phenol, the intermediate carbocation is more 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 Statement1 is true, statement 2 is false Statement 1 is true, statement 2 is true Solution :It is correct the phenol is more reactive than benzene.

Discussion

38.	Statement 1: Peracides are stronger acids than corresponding carboxylic acids. Statement 2: The anion of carboxylic acids is stabilized by resonance but not that of peracids.
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: Peracids are weaker ACIDS than corresponding CARBOXYLIC acids.

Discussion

39.	STATEMENT-1: Phenol is more reactive than benzene towards electrophilic substitution reaction. and STATEMENT-2: OH group of phenol is electron donating due to resonance.
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 :A

Discussion

40.	Statement 1: Peracids are stronger acids than corresponsing carboxylic acids. Statement 2: The anion of carboxylic acids is stabilized by resonance but not that of peracids.
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 :PERACIDS are weaker ACIDS than corresponding CARBOXYLIC acids.

Discussion

41.	Statement-1: Pentaamminethiocyanato-N-chromium(III) tetrachloridozincate(II) is a coloured compound and is an example of ionisation isomerism. Statement-2: The compound is paramagnetic and therfore, d-d transition is possible.
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(+3)(Cr)(NH_(3))_(5)(NCS)][overset(+2)(ZN)Cl_(4)]` 3 unpaired electron in `Cr^(3+)`.

Discussion

42.	Statement-1 : PbO_(2) is an oxidising agent and reduced to PbO. Statement-2 : Stability of Pb (II) lt Pb (IV)on account of inert pair 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 : Both are correct statement and statement-2 is the correct explanation for Statement-1.

Discussion

43.	Statement 1: Pb^(4+) compounds are stronger oxidizing agents than Sn^(4+) compounds. statement 2: The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to 'inert pair effect'.
Answer» Statement 1 is true, statement 2 is true, statement 2 si a correct EXPLANATION for statement 11 Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 11 Statement 1 is true, statement 2 is false Statement 1 is false, statement 2 is true Solution :statement 1 is true because lower oxidation STATE becomes more & more STABLE for HEAVIER element in p-block due to INERT pair effect. Hence statement 2 is false

Discussion

44.	Statement 1: p-hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. Statement 2: o-hydroxybenzoic acid has intramolecular hydrogen bonding.
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 :.

Discussion

45.	Statement-1: p-Nitroaniline is more polar than nitrobenzene and Statement-2: Nitro group has -M effect.
Answer» ANSWER :B

Discussion

46.	Statement-1 : Ortho boric acid crystals are hard and cannot be broken easily into the powder form. Statement-2 : In the solid state B(OH)_(3) units are hydrogen bonded together into two dimensional sheets.
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 :`H_(2)BO_(3)` forms a 2D-layered structure and LAYERS slide over each other.

Discussion

47.	STATEMENT-1 : Out of all actinoids , Th has highest melting point . STATEMENT-2: Th has largest size among actinoids .
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

48.	STATEMENT-1 : Order of reaction can never be fractional for an elementary reaction. and STATEMENT-2 : Elementary reactions take place by one step mechanism
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 :B

Discussion

49.	Statement-1: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization. Statement-2. Reaction involves repeated Walden inversion.
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: is the correct explanation of statement-1.

Discussion

50.	Statement -1: Only one Aldehyde 'X' responds positively with all the tests of carbonyl compunds like Tollen's tests, Fehling test, 2,4,DNP test, as well as iodoform test. Statement-2 All aldehydes respnds all the forur test given in assertion.
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 Fals, Statement -2 is True Solution :Assertion: True, `CH_(3)CHO` gives positive test with tollens reagents, FEHLING solutions, 2,4-DNP as WELL as Iodoform test REASON: False, all aldehydes to not give iodoform test.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Statement-1: Specific conductivity of an electrolytic solution decreases with dilution whereas molar conductivity. Statement-2: Specific conductivity is the conductance of a specific amount of the electrolyte whereas molar conductivity is for 1 mole of the electrolyte.

Statement-1: Solubility on n-alcohol in water decreases with increse in molecular weight. Statement-2: The hydropbobic nature of alkyl chain increases.

STATEMENT-1: Sodium thiosulphate is used in photography and STATEMENT-2: Sodium thiosulphate is photosensitive.

Statement-1: Sodium chloride is added during electrolysis of fused anhdrous magnesium chloride. Statement-2: Anhydous magnesium chloride is obtained by heating hydrated magnesium chloride, MgCl_(2).6H_(2)O

Statement 1: Snow does not melt at monutains easily. Statement 2: A decrease in pressure leads to an increase in freezing point of water.

STATEMENT-1 S_(N)2 reaction is carried out in the presence of polar aprotic solents and . STATEMENT-2: Polar aprotic solvent doesnot contain acidic hydrogen

Statement-1. Small quantity of soap is used to prepare a stable emulsion. Statement-2. Soap lowers the interfacial tension between oil and water.

STATEMENT-1 S_(N)1 reaction is comied out in the presence of polar protic solvent and STATEMENT-2 : Polar protic solvent increases stability of carboncation due to the solvation.

Statement 1: Schiff's regent is a dilute solution of rosaniline hydrochloride in water whoce magneta colour is discharged with aqueous SO_(2) or H_(2)SO_(3). Statement 2: Schiff's reagent oxidies benzaldehyde to benzoic acid.

Statement-1: Silica is added as a flux in reverberatory furnance, in the extraction of copper from copper pyrites. Statement-2: Silica decreases the melting point of the ore and remove the impurity of lead sulphide as PbSiO_(3)

Statement1: Ring test for nitrates is performed from the Na_(2)CO_(3) extract of the salt solution. Statement 2: All nitrates are soluble in water.

Statement-1: Sb_(2)S_(3) is not soluble in yellow ammonium sulphide. Statement-2: the common ion effect due to S^(2-) ions reduces the solubility of SbS_(3).

Statement -1 : Salts of ClO_(3)^(-) and ClO_(4)^(-) are well known but those of FO_(3)^(-) and FO_(4)^(-) are unknown. Satement - 2 : F is more electronegative than O while Cl is less electronegative than O.

STATEMENT - 1 : Result of victor Meyer test 1^(@) ROH-Red colour 2^(@) ROH - Blue colour 3^(@) ROH - white or no colour STATEMENT - 2 : Victor Meyer test is a method for separtions of 1^(@),2^(@) and 3^(@) alcohol.

Statement-1 : Rate of nitration is C_(6)H_(6) cong C_(6) D_(6) cong C_(6)T_(6) Statement-2 : Formation of wheland intermediate is rate determining step in nitration of benzene, not the breaking of C–H or C–D bond.

STATEMENT-1 Reaction between sodium tertbutoxide and ethyllodide doesnot produce ether and STATEMENT-2 : Sodium tert butoxide is very strong base but it is not a nucleophile

Statement-1: Reaction of disodium hydrogen phosphate with magnesium sulphate in presence of ammonium hydroxide gives a white crystalline precipitate. Statement-2:Insoluble magnesium ammonium phosphate is formed.

Statement-1: Reaction of t-butyl chloride on Wurtz reaction gives alkene. Statement-2: t-butyl chloride on Wurtz reaction gives alkene.

STATEMENT - 1 : Rate of reaction with Lucas reagent is C-overset(OH)overset(|)C-CgtC-C-OHgtC-OH STATEMENT - 2 : Lucas reagent reacts with all alcohol byS_(N)1mechanism and rate prop stability of carbocation.

Statement-1 : rate of dehydration. Statement-2: Rate of dehydration is directly proportional to stability of carbocation

Statement-1 : Rate of a chemical reaction increases as the temperature is increased. Statement-2 : As the temperature is increased fraction of molecules occupying E_(T) or more increases.

Statement-1. Rate constant of a zero order reaction has same units as the rate of reaction. Statement-2. Rate constant of a zero order reaction does not depend upon the units of concentration.

Statement-1. Ranitidine is used to treat hyperacidity while brompheniramine is used to treat hypersensitivity. Statement-2. Both the drugs are antihistamines.

which is/are statement is correct.Statement-1: R_(2)SiCl_(2) is the starting material for linear polymer of silicone. Statement-2: R_(2)SiCl_(2) is the starting material for 3-D polymer of silicone. Statement-3: R_(3)SiCl is the starging material for 3-D polymerr of silicone.

Statement 1: R-CH=CH_(2)overset(C Cl_(3)Br)underset("Peroxide")tooverset(Br)overset(|)(RCH)-CH_(2)C Cl_(3) Statement-2: The addition obey free radical addition on alkenes in presence of peroxide.

Statement- 1Pyridiniumchlorochromate canconvertprimaryalcoholsintocorrespondingaldehyde Statement -2MnO_(2)can oxidizebenzylicalcoholintocorrespondingcarboxylicacid Statement- 3 :OsO_(4) canconvert alkeneintotrans1,2- diol

STATEMENT-1: Quenched steel is very hard and brittle. and STATEMENT-2: During quenching, steel is heated to a temperature well below red hot.

STATEMENT-1: Pressure exerted by a real gas is lesser than that exerted bý an ideal gas under similar conditions. and STATEMENT-2: At high pressure repulsive forces dominate in real gases.

STATEMENT - 1 : Propan -2, 2-diol is unstable. STATEMENT - 2 : Repusion between lone pairs of electron of two OH groups makes its unstable.

Statement-1: Potassium ferrocyanide is diamagnetic where as potassium ferricyanide is paramagnetic . Statement-2: Crystal field spletting in ferrocyanide ion is greater than that of ferricyanide ion.

Statement-1. Polyester is a copolymer. Statement-2 The repeating structural unit of polyester is derived from two types of monomer units , ethylene glycol and terephthalic acid.

Statement -1: Potassium can not obtained by the electrolysis of fused KCL.And Statement -2: Potassium has high reactivity at the melting point of KCl.

Statement -1: PMMA is used for making lenses and light covers Statement -2: It has excellent light transmission properties.

Statement - 1 : Platinum and gold occur in native state in nature. And Statement - 2 : Platinum and gold are noble metals.

Statement - 1 : Pine oil is fused as a foaming agent in froth floatating process. And Statement - 2 : Adsorption principle is involved in froth floatating process.

Statement 1: Phenol is more reactive than benzene towards electrophilic substitution reaction. Statement 2: In the case of phenol, the intermediate carbocation is more resonance stabilized.

Statement 1: Peracides are stronger acids than corresponding carboxylic acids. Statement 2: The anion of carboxylic acids is stabilized by resonance but not that of peracids.

STATEMENT-1: Phenol is more reactive than benzene towards electrophilic substitution reaction. and STATEMENT-2: OH group of phenol is electron donating due to resonance.

Statement 1: Peracids are stronger acids than corresponsing carboxylic acids. Statement 2: The anion of carboxylic acids is stabilized by resonance but not that of peracids.

Statement-1: Pentaamminethiocyanato-N-chromium(III) tetrachloridozincate(II) is a coloured compound and is an example of ionisation isomerism. Statement-2: The compound is paramagnetic and therfore, d-d transition is possible.

Statement-1 : PbO_(2) is an oxidising agent and reduced to PbO. Statement-2 : Stability of Pb (II) lt Pb (IV)on account of inert pair effect.

Statement 1: Pb^(4+) compounds are stronger oxidizing agents than Sn^(4+) compounds. statement 2: The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to 'inert pair effect'.

Statement 1: p-hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. Statement 2: o-hydroxybenzoic acid has intramolecular hydrogen bonding.

Statement-1: p-Nitroaniline is more polar than nitrobenzene and Statement-2: Nitro group has -M effect.

Statement-1 : Ortho boric acid crystals are hard and cannot be broken easily into the powder form. Statement-2 : In the solid state B(OH)_(3) units are hydrogen bonded together into two dimensional sheets.

STATEMENT-1 : Out of all actinoids , Th has highest melting point . STATEMENT-2: Th has largest size among actinoids .

STATEMENT-1 : Order of reaction can never be fractional for an elementary reaction. and STATEMENT-2 : Elementary reactions take place by one step mechanism

Statement-1: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization. Statement-2. Reaction involves repeated Walden inversion.

Statement -1: Only one Aldehyde 'X' responds positively with all the tests of carbonyl compunds like Tollen's tests, Fehling test, 2,4,DNP test, as well as iodoform test. Statement-2 All aldehydes respnds all the forur test given in assertion.