94420 + Interview Questions in Chemistry in Class 12

1.	Assertion: tert-Butyl bromide undergoes wurtz reaction to give 2,2,3,3-tetramethylbutane. Reason: In Wutz reaction, alkyl halides reacts with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.
Answer» Assertion and reason both are CORRECT and reason is correct explanation of assertion. Assertion and reason both are WRONG statements. Assertion is correct but reason is wrong statement. Assertion is wrong but reason is correct statement. Solution :Correct assertion. Sec-Butyl bromide UNDERGOES WURTZ reaction to give 2,5-dimethylhexane.

Discussion

2.	Assertion:- Ter-utyl chloride on treatment with Na metal gives isobutane and Isobutylene. Reason:- It is known as wurtz reaction.
Answer» If both Assertion `&` REASON are True `&` the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion `&` Reason are False. Answer :C

Discussion

3.	Assertion : ter-Butyl methyl ether on cleavage with conc. HI at 373K gives tert-butyl iodide and methanol. Reason : The reaction occurs by S_N2 mechanism.
Answer» BothA and B are true and R is the CORRECT explanation of A. A is true but R is FALSE. A is False but R is True. Both A and R are false. Solution :The REACTION PROCEEDS by `S_N1` Mechanism.

Discussion

4.	Assertion : Teflon is used to making oil seals, gaskets and non-stick surface coating . Reason : Teflon is chemically inert and resistant to attack by corrosive reagents.
Answer» If both ASSERTION and reason are TRUEAND reason is the correct explanationof assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is FALSE. If both assertion and reason are false. ANSWER :A

Discussion

5.	Assertion: Teflon has high thermal stability and chemical inertness. Reason : Teflon is a thermosetting polymer.
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 reason : Thermal STABILITY and chemical inertness is due to the presence of several strong C-F bonds.

Discussion

6.	Assertion : T, P and V are state variables or state functions. Reason : Their values depends on the state of the system and how it is reached.
Answer» If both ASSERTION and reason are true and the reason is the CORRECT explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false. Solution :VALUES of STATE functions depend only on the state of the system and not how it is reached.

Discussion

7.	Assertion : Supeoxides of alkali matels are paramagnetic. Reason : Superoxides conatain the ion O_(2)^(-) which has one unpaired electron in its anti-bonding molecule orbital.
Answer» If ASSERTION is true but the REASON is FALSE If assertion is false but reason is true If both assertion and reason are true and the reason is the CORRECT explanation of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion Answer :C

Discussion

8.	Assertion : Supha drug contain sulphonamide group Reason: Salvarsan is a sulpha drug
Answer» Assertion and reason both are CORRECT statement but reason does not explain assertion Assertion and reason both are correct and reason EXPLAINS the assertion Both assertion and reason are wrong statement Assertion is correct statement reason is wrong statement Solution :Correct reason. Salvarsan is an antibacterial but does not contain sulphonamide group

Discussion

9.	Assertion: t-Butyl methyl ether is not prepared by the reaction of t-butyl bromide with sodium methoxide. Reason: Sodium methoxide is a strong nucleophile.
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 o the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct explanation. In presence of a STRONG base, i.e., sodium methoxide, tert-butyl bromide undergoes dehydrohalogenation to FORM isobutylene.

Discussion

10.	Assertion : Sulphur is oxidised by H_(2)O_(2) in presence of Fe(III) Reason :- Fe(III) oxidises sulphur to sulphate
Answer» If both Assertion & REASON are True & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :A

Discussion

11.	Assertion : Sulphide ores are concentrated by Froth Flotation method. Reason : Cresols stabiles the froth in Froth Flotation method,
Answer» Both assertion and reason are true and reason is the correct EXPLANATION of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason is false. Assertion is false but reason is true. Solution :Sulphide ores are concentrated by FROTH floatation method because sulphide ores are light and get WET easily by OILS and easily comes on a surface leaving behind GANGUE.

Discussion

12.	Assertion: Sulphideoresareconcentrated byFrothFloatationmethod. Reason: Cresolsstabilisethefroth inFroth Floatationmethod.
Answer» Bothassertionandreason aretrueandreason is thecorrectexplanationofassertion. Both assertionandreasonaretruebutreasonis not thecorrectexplanationofassertion. Assertionistrue butreasonisfalse. Assertionis falsebutreasonistrue. SOLUTION :Correctexplanation. Sulphideore PARTICLESARE PREFERENTIALLY wettedbyoil,becomelighterandthusrisetothesurfacealongwiththe frothwhilegangueparticlesarepreferentiallywtted BYWATER, becomeheavier andthussettle down atthebottomof THETANK.

Discussion

13.	Assertion: Sulphanilic acid has high melting point and is practically insoluble in water. Reason : Sulphanilic acid exists as zwitter ion salt.
Answer» ANSWER :a

Discussion

14.	Assertion : Sulpha durgs contain sulphonamide group. Reason : Salvarsan is a sulpha drug.
Answer» If both assertion and REASON are trueand reason is the correct EXPLANATIONOF assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is false. If both assertion and reason are false. Solution :Salvarsan in an ANTIBACTERIAL but does not contain SULPHONAMIDE group.

Discussion

15.	Assertion: Sucrose is a non reducing sugar. Reason : Sucrose is a disaccharide formed by glycosidic linkage between C-1 of alpha-glucose and C-2 of beta-fructose.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

16.	Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method.
Answer» Both assertion and REASON are true and reason is the correct explanation of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is false but reason is false. Assertion is false but reason is true. Solution :Correct explanation : ORE PARTICLES are WETTED by oil and gangue impurities by WATER.

Discussion

17.	Assertion : Sucrose is a disaccbaride Reason : Sucrose on hydrolysis yields glucose and fructose
Answer» SOLUTION :(A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)

Discussion

18.	Assertion : Sucrose is a non -reducing sugar. Reason : It has glycosidic linkage.
Answer» If both assertion and REASON are true , and 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 ASSERATION is true , but reason is false. If both assertion and reason are false. Solution :CORRECT Explanation : Glucose and fructose in SUCROSE are connetced through their reducing centres.

Discussion

19.	Assertion : Strong interparticleforces exist in thermosetting polymers. Reason : Thermosetting polymers are heavily cross linked.
Answer» If both ASSERTION and reason are TRUEAND reason is the CORRECT EXPLANATIONOF assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is FALSE. If both assertion and reason are false. Answer :A

Discussion

20.	Assertion : Standard hydrogen electrode (SHE) is assigned an emf of zero arbitarily Reason : SHE can act as cathode only
Answer» (A) and (R) are TRUE and (R) is the correct explanation of (A) Both (A) and (R) are true but (R) does not EXPLAIN (A) (A) is true but (R) is false Both (A) and (R) are false Answer :C

Discussion

21.	Assertion: Space or crystal lattice differ in symmetry of the arrangement of points. Reason: nlambda=2d sin theta, is known as Bragg's equation.
Answer» If both assertion and reason are TRUE and the reason is the correct EXPLANANTION of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If the assertion and reason both are false. Solution :Space or cyrstal lattice is a regular REPEATING arrangement of points in space and forms the BASIS of CLASSIFICATION of all structures.

Discussion

22.	Assertion: Sometimes a white turbidity is obtained when a solution is prepared in water. Reason: Pb^(2+) catinos are precipitate as PbCl_(2) which is sparingly solution in water.
Answer» If assertion is TRUE but the reason is false If assertion is false but reason is true If both assertion and reason are true and reason is the correct explanation of assertion If OTH assertion and reason are true but reason is not the correct explanation of assertion Solution :The white ppt. is due to the formation of the BiOCl or SbOCl `BiCl_(3)+H_(2)O HARR BiOCl+2HCl` `SbCl_(3)+H_(2)O hArr SbOCl+2HCl` `Pb^(2+)+2Cl^(-) to PbCl_(2)darr`

Discussion

23.	Assertion : Solubility of n-orbital of n-orbital in waterdecreasewith increase in molecular weight . Reason : The hydrophobic nature of alkyl chain increase.
Answer» If ASSERTION is TRUE but the REASON is false If assertion is false but reason is true If both assertion and reason are true and the reason is the correct EXPLANATION of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion Answer :C

Discussion

24.	Assertion : Solubility of AgCI in water decreases in the presence of NaCI. Reason : Sodium chloride under goes hydrolysis in water.
Answer» (A) and ( R) are TRUE and ( R) is the CORRECT explanation of (A) Both (A) and ( R) are true but ( R) does not explain (A) (A ) is true but (R ) is false Both (A) and ( R) are false Answer :B

Discussion

25.	Assertion: Solubilities of proteins is minimum at the isoelectronic point. ltbRgt Reason: At isoelectronic point , protein molecules behaves as a zwitter ion.
Answer» If both ASSERTION and reason are true and the reason is the CORRECT EXPLANATION of the assertion. If both assertion and reason are true but reason is not the corret explanation of the assertion. If assertion is true but reason is false. If the assertion and the reason both are false. Solution :Solubility of protein is maximum at the isoelectric POINT.

Discussion

26.	Assertion : Solids in finely divided state act as good adsorbents. Reason : Adsorption is a surface phenomenon .
Answer» If both assertion and reason are true and reasonis the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false Solution :Solids in FINELY DIVIDED state have large SUFACE area.

Discussion

27.	Assertion: Sodium p-dodecyl benzene sulphonate is a sufactant Reason: It contains water soluble SO_3^(-) group and water insoluble -C_6 H_4 - C_(12) H_(23) group.
Answer» Both A and R and true and R is the correct EXPALANTION of A Both A and R are true but R is not a correct EXPLANATION of A A is true but R is false A is false but R is true Answer :A

Discussion

28.	Assertion: Sodium lauryl sulphate is biodegradable detergent Reason: It contains branched chain alkyl group.
Answer» Both A and R and true and R is the CORRECT EXPALANTION of A Both A and R are true but R is not a correct explanation of A A is true but R is false A is false but R is true ANSWER :C

Discussion

29.	Assertion Sodium ions are discharged at the Hg electrode during electrolysis is preference to H^(+) ions. Reason The nature of electrode also affect the order or discharge of cations.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false Both A and R arefalse. Answer :B

Discussion

30.	Assertion Sodiumchloride undergoes hydrolysis in its solution in water. Reason When the ionic product of a salt in a solution exceeds its solubility product at a giv en temperature, the salt precipitates out.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false Both A and R arefalse. Answer :D

Discussion

31.	Assertion : Sodium chloride is added to precipitate soap after saponification Reason : Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form
Answer» Assertion and REASON both are correct STATEMENT but reason does not explain assertion Assertion and reason both are correct and reason explains the assertion Both assertion and reason are wrong statement Assertion is correct statement reason is wrong statement Solution :Reason is the correct EXPLANATION of the assertion.

Discussion

32.	Assertion. Sodium-2-dodecyl benzenesulphonate is a biodegradable detergent. Reason. Detergents having highly branched chains are biodegradable.
Answer» SOLUTION :CORRECT reason. Detergents with LONG straight CHAINS (unbranced chains ) are biodegradable.

Discussion

33.	Assertion : SO_(3) has a planar structure. Reason : S atom in SO_(3) " is " sp^(2) hybridised and O-S-O bond angle is 120^(@).
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If both assertion and reason are incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

34.	Assertion: SO_(3) acts as an oxidising agent as well as a reducing agent Reason: SO_(2) acts as an oxidising as well as a reducing agent
Answer» ANSWER :D

Discussion

35.	Assertion: SO_(4)^(2-) is estimated as BaSO_(4)but not as MgSO_(4)
Answer» If both ASSERTION and REASON are TRUE and the reason is the correct explanation of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion If assertion is FALSE but reason is true If assertion is true but the reason is false Answer :B

Discussion

36.	Assertion: S_(N)2 reactions proceed with inversion of configuration. Reason: S_(N)2 reactions occur in one step.
Answer» If both assertionn 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: The attack of nucleophile occurs from a SIDE opposite to the HALOGEN ATOM resulting in inversion of CONFIGURATION.

Discussion

37.	Assertion : S_(N)^(2) reaction proceeds with inversionk of configuration. Reason : S_(N)^(2) reaction occurs in one step
Answer» Both ASSERTION and reason are CORRECT, and reason is the correct explanation of the assertion. Both assertion and reason are True, but reason is not the correct explanation of the assertion. Assertion is INCORRECT, but reason is correct Both assertion and reason are incorrect Answer :B

Discussion

38.	Assertion: S_(N)1 reaction is basically a solvolysis reaction. Reason: Polar protic solvents help the substrate to ionize and by the way get involved in S_(N)1 reaction.
Answer» If both ASSERTIONN 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. Answer :A

Discussion

39.	Assertion: S_(N^(2)) reactions do not proceed with retention of configuration. Reason: S_(N^(2)) reactions proceed in a single step.
Answer» If both assertion and reason are correct and reason is correct explanation for assertion If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. if both assertion and reason are incorrect. Solution :Correct explanation. In `S_N^(2)` REACTIONS, the nucleophile attacks the SUBSTRATE from the SIDE OPPOSITE to the side where the LEAVING group is present.

Discussion

40.	Assertion. Small quantity of soap is usedto prepare a stable emulsion. Reason. Soap lowers the interfacial tension between oil and water.
Answer» If both assertion and REASON are TURE, and reason is the trure 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 false. SOLUTION :R is the correct explanation of A.

Discussion

41.	Assertion :- Smallest blood cell is RBC Reason :- Platelets are cell fragments not true cells.
Answer» If both Assertion & Reason are True & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion. If Assertion is True but the Reason is False. If both Assertion & Reason are False Answer :B

Discussion

42.	Assertion :- Small intestine is principal organ for absorptions nuttrients. Reason :- The digestion is completed here and the final products of digestion are absorbed through blood into the mucosa.
Answer» If both ASSERTION & REASON are True & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion. If Assertion is True but the Reason is False. If both Assertion & Reason are False Answer :C

Discussion

43.	Assertion : SN_(2) reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation. Reason : S_(N)reactionsalways proceed with inversion of configuration.
Answer» Assertionis CORRECT, REASON is correct, reason is a correct explanation for assertion. Assertionis correct, reason is correct, reasonis not a correct explanation for assertion Assertionis correct, reasonis incorrect Assertion is incorrect, reasonis correct. Solution :Assertion is false, because aryl halides do not undergo NUCLEOPHILIC substitution under ordinary conditions. This is due to resonance, because of which the carbon– chlorinebondacquirespartialdoublebond character, HENCE it becomes SHORTER and stronger and thus cannot be replaced by nucleophiles.However Reason istrue.

Discussion

44.	Assertion :- Silicons are organosilicon polymers, which have (-R_(2)SiO^(-)) as repeating unit. Reason :- Silicon (Si) has high catenation tendency.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a correct explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion. If Assertion is True but the Reason is False. If both Assertion & Reason are False Answer :B

Discussion

45.	Assertion : Silica gel is used to dry air. Reason : Silica gel absorbs moisture from air.
Answer» If both assertion and REASON are true and REASONIS the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false Solution :SILICA GEL ADSORBS water vapours.

Discussion

46.	Assertion. SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason. Size of F is small and its lone pair of electrons interact with d-orbitals of Si strongly.
Answer» If both ASSERTION and REASON are TRUE, and reason is the CORRECT explanation of the assertion. If both assertion and reason are ture, but reason is not the correct explanantion of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

47.	Assertion : SF_6 cannot be hydrolysed but SF_4 can be. Reason : Six F atoms in SF_6 prevent the attack of H_(2)Oon sulphur atom of SFg.
Answer» Both ASSERTION and reason are CORRECT statements, and reason is the correct explanation of the assertion. Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion. Assertion is correct, but reason is WRONG statement. Assertion is wrong but reason is correct statement. Solution :`SF_`6 is sterically protected. HENCE, `H_2O` cannot attack `SF_6`.

Discussion

48.	Assertion : Sequence of bases in DNA is TGAACCCTT and sequence of bases in m-RNA is CATTAAACC. Reason: In DNA nitrogeneous bases have hydrogen bonds.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the corret explanation of the assertion. If assertion is true but reason is false. If the assertion and the reason both are false. Solution :Sequence of bases in DNA is TGAACCTT. SINCE according to base-pairing principle, T in DNA faces A in m-RNA, while G faces C and a faces U. THEREFORE, sequence of bases in m-RNA is ACUUGGGAA.

Discussion

49.	Assertion. Separation of Zr and Hf is difficult. Reason.Zr and Hf lie in the same group of the periodic table.
Answer» SOLUTION :Correct EXPLANATION. Due to LANTHANOID contraction Zrand Hf have NEARLY the same size.

Discussion

50.	Assertion : SF_(6) cannot be hydrolysed but SF_(4) can be. Reason : Six F atoms in SF_(6) prevent the attack of H_(2)O on sulphur atom of SF_(6).
Answer» Both ASSERTION and REASON are correct statements, and reason is the correct EXPLANATION of the assertion. Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion. Assertion is correct, but reason is WRONG statement. Both assertion and reason are wrong statement. Solution :Reason is the correct explanation of assertion.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: tert-Butyl bromide undergoes wurtz reaction to give 2,2,3,3-tetramethylbutane. Reason: In Wutz reaction, alkyl halides reacts with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.

Assertion:- Ter-utyl chloride on treatment with Na metal gives isobutane and Isobutylene. Reason:- It is known as wurtz reaction.

Assertion : ter-Butyl methyl ether on cleavage with conc. HI at 373K gives tert-butyl iodide and methanol. Reason : The reaction occurs by S_N2 mechanism.

Assertion : Teflon is used to making oil seals, gaskets and non-stick surface coating . Reason : Teflon is chemically inert and resistant to attack by corrosive reagents.

Assertion: Teflon has high thermal stability and chemical inertness. Reason : Teflon is a thermosetting polymer.

Assertion : T, P and V are state variables or state functions. Reason : Their values depends on the state of the system and how it is reached.

Assertion : Supeoxides of alkali matels are paramagnetic. Reason : Superoxides conatain the ion O_(2)^(-) which has one unpaired electron in its anti-bonding molecule orbital.

Assertion : Supha drug contain sulphonamide group Reason: Salvarsan is a sulpha drug

Assertion: t-Butyl methyl ether is not prepared by the reaction of t-butyl bromide with sodium methoxide. Reason: Sodium methoxide is a strong nucleophile.

Assertion : Sulphur is oxidised by H_(2)O_(2) in presence of Fe(III) Reason :- Fe(III) oxidises sulphur to sulphate

Assertion : Sulphide ores are concentrated by Froth Flotation method. Reason : Cresols stabiles the froth in Froth Flotation method,

Assertion: Sulphideoresareconcentrated byFrothFloatationmethod. Reason: Cresolsstabilisethefroth inFroth Floatationmethod.

Assertion: Sulphanilic acid has high melting point and is practically insoluble in water. Reason : Sulphanilic acid exists as zwitter ion salt.

Assertion : Sulpha durgs contain sulphonamide group. Reason : Salvarsan is a sulpha drug.

Assertion: Sucrose is a non reducing sugar. Reason : Sucrose is a disaccharide formed by glycosidic linkage between C-1 of alpha-glucose and C-2 of beta-fructose.

Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method.

Assertion : Sucrose is a disaccbaride Reason : Sucrose on hydrolysis yields glucose and fructose

Assertion : Sucrose is a non -reducing sugar. Reason : It has glycosidic linkage.

Assertion : Strong interparticleforces exist in thermosetting polymers. Reason : Thermosetting polymers are heavily cross linked.

Assertion : Standard hydrogen electrode (SHE) is assigned an emf of zero arbitarily Reason : SHE can act as cathode only

Assertion: Space or crystal lattice differ in symmetry of the arrangement of points. Reason: nlambda=2d sin theta, is known as Bragg's equation.

Assertion: Sometimes a white turbidity is obtained when a solution is prepared in water. Reason: Pb^(2+) catinos are precipitate as PbCl_(2) which is sparingly solution in water.

Assertion : Solubility of n-orbital of n-orbital in waterdecreasewith increase in molecular weight . Reason : The hydrophobic nature of alkyl chain increase.

Assertion : Solubility of AgCI in water decreases in the presence of NaCI. Reason : Sodium chloride under goes hydrolysis in water.

Assertion: Solubilities of proteins is minimum at the isoelectronic point. ltbRgt Reason: At isoelectronic point , protein molecules behaves as a zwitter ion.

Assertion : Solids in finely divided state act as good adsorbents. Reason : Adsorption is a surface phenomenon .

Assertion: Sodium p-dodecyl benzene sulphonate is a sufactant Reason: It contains water soluble SO_3^(-) group and water insoluble -C_6 H_4 - C_(12) H_(23) group.

Assertion: Sodium lauryl sulphate is biodegradable detergent Reason: It contains branched chain alkyl group.

Assertion Sodium ions are discharged at the Hg electrode during electrolysis is preference to H^(+) ions. Reason The nature of electrode also affect the order or discharge of cations.

Assertion Sodiumchloride undergoes hydrolysis in its solution in water. Reason When the ionic product of a salt in a solution exceeds its solubility product at a giv en temperature, the salt precipitates out.

Assertion : Sodium chloride is added to precipitate soap after saponification Reason : Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form

Assertion. Sodium-2-dodecyl benzenesulphonate is a biodegradable detergent. Reason. Detergents having highly branched chains are biodegradable.

Assertion : SO_(3) has a planar structure. Reason : S atom in SO_(3) " is " sp^(2) hybridised and O-S-O bond angle is 120^(@).

Assertion: SO_(3) acts as an oxidising agent as well as a reducing agent Reason: SO_(2) acts as an oxidising as well as a reducing agent

Assertion: SO_(4)^(2-) is estimated as BaSO_(4)but not as MgSO_(4)

Assertion: S_(N)2 reactions proceed with inversion of configuration. Reason: S_(N)2 reactions occur in one step.

Assertion : S_(N)^(2) reaction proceeds with inversionk of configuration. Reason : S_(N)^(2) reaction occurs in one step

Assertion: S_(N)1 reaction is basically a solvolysis reaction. Reason: Polar protic solvents help the substrate to ionize and by the way get involved in S_(N)1 reaction.

Assertion: S_(N^(2)) reactions do not proceed with retention of configuration. Reason: S_(N^(2)) reactions proceed in a single step.

Assertion. Small quantity of soap is usedto prepare a stable emulsion. Reason. Soap lowers the interfacial tension between oil and water.

Assertion :- Smallest blood cell is RBC Reason :- Platelets are cell fragments not true cells.

Assertion :- Small intestine is principal organ for absorptions nuttrients. Reason :- The digestion is completed here and the final products of digestion are absorbed through blood into the mucosa.

Assertion : SN_(2) reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation. Reason : S_(N)reactionsalways proceed with inversion of configuration.

Assertion :- Silicons are organosilicon polymers, which have (-R_(2)SiO^(-)) as repeating unit. Reason :- Silicon (Si) has high catenation tendency.

Assertion : Silica gel is used to dry air. Reason : Silica gel absorbs moisture from air.

Assertion. SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason. Size of F is small and its lone pair of electrons interact with d-orbitals of Si strongly.

Assertion : SF_6 cannot be hydrolysed but SF_4 can be. Reason : Six F atoms in SF_6 prevent the attack of H_(2)Oon sulphur atom of SFg.

Assertion : Sequence of bases in DNA is TGAACCCTT and sequence of bases in m-RNA is CATTAAACC. Reason: In DNA nitrogeneous bases have hydrogen bonds.

Assertion. Separation of Zr and Hf is difficult. Reason.Zr and Hf lie in the same group of the periodic table.

Assertion : SF_(6) cannot be hydrolysed but SF_(4) can be. Reason : Six F atoms in SF_(6) prevent the attack of H_(2)O on sulphur atom of SF_(6).