94420 + Interview Questions in Chemistry in Class 12

1.	Assertion When the solution pressure of a metal is more than the osmotic pressure of the ions, the cations pass into the solution more rapidly leaving the electrode negatively charged. Reason When the solution pressure of the metal is less than the osmotic pressure of the ions, the cations migrate from solution and get deposited on the electrodes making it positive ly charged.
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

2.	Assertion : When the alkyl group is small like -CH_(3) group, there is n steric hindrance to H-bonding. Reason (R) : In aniline or other arylamines, the -NH_(2) group is attached directly to the benzene ring.
Answer» Both Assertion (A) and REASON (R) are correct STATEMENTS, and Reason (R) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is INCORRECT statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :B

Discussion

3.	Assertion : When protein is exposed to a higher temperature, it losses its three dimensional structure. Reason : Protein. when _denatured does not lose its biological function.
Answer» SOLUTION :(A) is TRUE but (R) is FALSE

Discussion

4.	Assertion : When one solvent mixed with other solvent vapour pressure of one increases and other decreases. Reason : When any solute added into solvent ,vapour pressure of solvent decreases
Answer» If both the ASSERTION and REASON are true and reason is a true explanation of the assertion. If both the assertion and reason are true but reason is not the CORRECT explanation of the assertion If assertion is true but reason is false If assertion is false but reason is true. Answer :B

Discussion

5.	Assertion : When one solvent mixed with other solvent, vapour pressure of one increases an decreases. Reason : When any solute added into solvent, vapour pressure of solvent decreases
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 ASERTION and reason are false. Answer :B

Discussion

6.	Assertion. When NO reacts with FeSO_(4), a brown coloured complex is formed. Reason. In the complex, the coordination number of Fe is + 6.
Answer» If both assertion and reason are true, but reason is not the true explanation of the assertion If both assertion and reason are true, but reason is not the true explanation of the assertion If assertionis true, but reason is false If both assertion and reason are false Solution :Correct explanation. The colour of the complex formed, `[Fe(H_(2)O)_(5)NO]^(2+)` is DUE to charge TRANSFER (transfer of odd `E^(-)` on N to Fe, CHANGING NO to `NO^(+)` and `Fe^(2+)` to `Fe^(+)`).

Discussion

7.	Assertion. When NO reacts with FeSO_(4), a brown coloured complex is formed. Reason. In the complex, the coordination number of Fe is 6.
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 :B

Discussion

8.	Assertion: When NaCl is added to water a depression in freezing point is observed Reason: The lowering in vapour pressure of a solution causes depression in freezing point.
Answer» Both ASSERTION and Reason are TRUE and Reason is the correct explanation of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is FALSE Both Assertion and Reason are false ANSWER :A

Discussion

9.	Assertion : When NaCl is added to water, a depression in freezing point is observed. Reason : The lowering of vapour pressure of a solution cuaes depression in the freezing point.
Answer» ASSERTION and reason both are correct statement and reason is correct EXPLANATION for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is WRONG statement. Assertion and reason both are INCORRECT statements. Answer :a

Discussion

10.	Assertion : When NaCl is added to water a depression in freezing point is observed. Reason : The lowering of vapour pressure of a solution causes depression in the freezing point.
Answer» Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct STATEMENT but reason is wrong statement. Assertion and reason both are incorrect statements. Solution :Explanation : On addition of nonvolatile solute (viz. NaCl)to water NACl solution is FORMED. Due to relatively lesser NUMBER of water molecules at the surface of liquid, the solution EXERTS a lower vapour pressure as compared to that of pure water. It is because of this lowering of vapour pressure that a DEPRESSION in freezing point of water is observed.

Discussion

11.	Assertion (A) When NaCl is added to water a depression in freezing point is observed. Reason (R ) The lowering of vapour pressure of a solution causes depression in the freezing point.
Answer» Assertion and RESON both are correct STATEMENTS and reson is sorrect explanation for assertion. Assertion and reson both are correct statements but resons is not correct explanation for assertion. Assertion and REASON both are incorrect statements. Assertion is WRONG STATEMENT but reason is correct statement. Solution :Reason is the correct explanation for assertion.

Discussion

12.	Assertion : When methyl alcohol is added to water, boiling point of water increases. Reason : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.
Answer» Assertion and reason both are CORRECT statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion and reason both are incorrect statements. Solution :Explanation : (A) Methyl alcohol & water both are volatile liquids which when mixed together to form a binary solution, the vapour pressure of this solution BECOMES more as COMPARED to individual pure components. This affects the BOILING point of water with a decrease. Further, (B) When methyl alcohol is added to water A-B interaction `LT` A-A or B-B interaction that is why it will show positive deviation from Raoult.s law. Since a positive deviation from Rault.s law indicates a rise in vapour pressure the boiling point decreases.

Discussion

13.	Statement-1 : When metyl alcohol is added to water, boliling point of water increases. Statement-2 : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.
Answer» Assertion and reson both are correct statements and reson is sorrect explanation for assertion. Assertion and reson both are correct statements but resons is not correct explanation for assertion. Assertion and reason both are INCORRECT statements. Assertion is WRONG statement but reason is correct statement. Solution :Correct Assertion. When methyl alcohol is ADDED to WATER, biling point of water from MINIMUM boiling azetrope.

Discussion

14.	Assertion : When methyl alcohol is added to water, boiling point of water increases. Reason : When a volatile solute is added to a volatile solvent, elevation in boiling point is observed.
Answer» Assertion and reason both are correct statement and reason is correct explanation for assertion. Assertion and reason both are correct STATEMENTS but reason is not correct explanation for assertion. Assertion is correct statement but reason is WRONG statement. Assertion and reason both are incorrect statements. Solution :Correct Assertion. When METHYL alcohol is added to WATER, boiling point of water decreases. Correct Reason . When a more volatile SOLUTE is added to volatile solvent, vapour pressure of solvent increases.

Discussion

15.	Assertion : When KI solution is added to AgNO_(3) solution, negatively charged sol results . Reason : Negative charge of sol is due to preferential adsorption of iodide ions from the dispersion medium.
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 :When KI solution is added to `AgNO_(3)` solution, positively CHARGED sol results DUE ot adsorption of `Ag^(+)` ions from dispersion MEDIUM. `underset("Positively charged")underset(AgI//Ag^(+))`

Discussion

16.	Assertion :When H_(2)S is passedthrough a solution of CuSO_(4) noprecipitate of CuS is abtain until the solutionis acidifiedwith HCI Reasion: The solutionproducts constant of CuS is not so high as to require a high concentration of S^(2-) for theprecipitateof CuS
Answer» If both (A) and (B) are correct and (R ) is the correct explqanation of (A) If both (A) and (B) are correct but (R ) is not the correct explqanation of (A) If (A) is correct ,but (R ) is incorrect If (A) is incorrect ,but (R ) is correct Solution :It is true thatprecipitateof `CUS`does not REQUIR a high CONCENTRATION of `S^(2-)` ions But thisdoes notmeanthat `CuS` will notprecipitate with a higherconcentrationof `S^(2-)` In fact ,the precipitatewill be faciliated by a highconcentration of `S^(2-)` ,i.e. when thesolutionis not acidified so , (A) is false ,but (R ) is true

Discussion

17.	Assertion: When H_(2)S is passed through a solution of CuSO_(4), no precipiate of CuS is obtained until the solution is acidifeid with HCl. Reason: The solubility product constant of CuS is not so high as to require a high concentration of S^(2-) for the precipitate of CuS.
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 Answer :B

Discussion

18.	Assertion :When H_(2)S is passedthrough a solutioncontaining [Cu(CN)_(4)]^(2-) and [Cd(CN)_(4)]^(2-) ions ,only cadinilumprecipitateas CdS. Reasion : The oxidationstateand coordination number of cadmiumin [Cd(CN)_(4)]^(2-) are 2 and 4 respectively.
Answer» If both (A) and (B) are correct and (R ) is the correct explqanation of (A) If both (A) and (B) are correct but (R ) is not the correct explqanation of (A) If (A) is correct ,but (R ) is INCORRECT If (A) is incorrect ,but (R ) is correct Solution :(A) is true and itsexplanationis based on the stabilityconstantof the TWO complex ionspresent in solution (R ) is ALSO true not the correct explanation for(A)

Discussion

19.	Assertion : When borax is strongly heated it forms transparent glassy bead. Reason : Borax is the other name for sodium tetraborate decahydrate.
Answer» Both assertion and REASON are TRUE and the reason is the correct explanation of the assertion. Both the assertion and reason are true but the reason is not the correct explanation of the assertion. Assertion is true but reason is FALSE. Both assertion and reason are false. ANSWER :B

Discussion

20.	Assertion: When acidified zinc sulphate solution is electrolysed between zinc electrodes, it is zinc that is deposited at the cathode and hydrogen evolution does not take place. Reason: The electrode potential of zinc is more negative than hydrogen as the overvoltage for the hydrogen as the evolution on zinc is quite large.
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. Answer :A

Discussion

21.	Assertion : When a starch is heated between 200 - 250^(@)C changes to dextrin. Reason : Starch solution gives a blue : I colour with iodine.
Answer» SOLUTION :Both (A) and (R) are TRUE but (R) does not EXPLAIN (A)

Discussion

22.	Assertion When a solution of non-volatile solute in volatile solvent is distilled, boiling point of the left-over solution increasesgradually. Reason Distillationincrease the molality of the left-over solution.
Answer» Both ASSERTION and REASON are CORRECT and reason is the correct EXPLANATION of the assertion, Both assertion and reason are correct but reason is not the correct explanation of assertion. Assertion is correct but reason is WRONG. Assertion is wrong but reason is correct. Answer :A

Discussion

23.	Assertion: When a solution of Na_(2)ZnO_(2) is acidified with dilute HCl and treated with H_(2)S, a precipitate of ZnS is formed. Reason: Na_(2)ZnO_(2) is decomposed by HCl to give Zn^(2+) ions.
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 Answer :B

Discussion

24.	Assertion : When a solutionof Na_(2)ZnO_(2) is acidified withdilute HCI and reactedwith H_(2)S a precipitate of ZnS is formed Reasion :Na_(2)ZnO_(2) is decomposed by HCI to give Zn^(2+) ions.
Answer» If both (A) and (B) are correct and (R ) is the correct explqanation of (A) If both (A) and (B) are correct but (R ) is not the correct explqanation of (A) If (A) is correct ,but (R ) is incorrect If (A) is incorrect ,but (R ) is correct Solution :Correctassertion (A) `Na_(2)ZnO_(2) `+ `H_(2)S` rarr `overset(ZnS)underset((WHITE))` + `2NAOH` `NaZnO_(2)` is not acidifiedbeforepassing `H_(2)S`

Discussion

25.	Assertion : When a solution is spearated form the pure solvent bu a semi-permeable membrane, the solvent molecules pass through it form pure solvent side to the soution side. ltbgt Reason : Diffusion of solvent occurs form a region of high concentration solution to a region of low concentration solution.
Answer» Assertion and reson both are correct statements and reson is sorrect explanation for assertion. Assertion and reson both are correct statements but resons is not correct explanation for assertion. Assertion and reason both are INCORRECT statements. Assertion is wrong statement but reason is correct statement. Solution :Correct reason. Diffulsion of solvent OCCURS form a region of LOW SOLUTE concentration to a region of HIGH solute concerntration.

Discussion

26.	Assertion : When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side.Reason : Diffusion of colvent occurs from a region of high concentration solution to a region of low concentration solution.
Answer» Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion and reason both are incorrect statements. Solution :Explantion : Assertion is correct statement but reason is a wrong statement because a semipermeable MEMBRANE permits SOLVENT molecules to pass through a solution of LOWER concentration to that of higher concentration FLOW of solvent molecule from solvent side to solution side through semipermeable membrane is called osmosis.

Discussion

27.	Assertion : When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. Reason : Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.
Answer» Assertion and reason both are correct STATEMENT and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion and reason both are incorrect statements. Solution :Correct Reason. NET flow of solvent occurs from REGION of LOW concentration to the region of HIGH concentration.

Discussion

28.	Assertion : When a connection solution is diluted by acidic aqueous solution remains unchanged . Reason: Product of moles of aolute and volume is equal to the molarity.
Answer» if both assertion and REASON are true and reason is thr CORRECT EXPLANATIONOF 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 reson are false. Solution :Molarity equation is WRITTEN as `M_1 v_1 =M_2 V_2 ` thus if the d`V_2 ` changes `M_2 ` also changes . `"Molarity " =("moles of solute ")/(" volume of solution in litre ")`

Discussion

29.	Assertion : When 3 to 10% sulphur is added rubber becomes soft and stretchy. Reason : Physical properties of rubber are not altered by the amount of sulphur added.
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 :D

Discussion

30.	Assertion :When 1.0 mol of NaCl is doped with 10^(-3) mol SrCl_2 , the number of cationic sites remaining vacant is 10^(-3). Reason :Each SrCl_2 unit produces tow cationic vacancy.
Answer» Both ASSERTION and REASON are true and Reason is the CORRECT explanation of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is false Both Assertion and Reason are false Answer :D

Discussion

31.	Assertion: wedge_(m) for weak electrolytes shows a sharp incrase when the electrolytic solution in diluted. Reason: For weak electrolytes, degree of dissociation increases with dilutio of solution.
Answer» Both ASSERTION and REASON are TRUE and the reason is the CORRECT EXPLANATION of assertion. Both assertion and reason are true and the reason is not the correct explanation of assertion. Assertion is true but the reason is false. Both assertion and reason are false. Answer :A

Discussion

32.	Assertion: Weston is a standard cell. Reason: its e.m.f. does not change with temperature.
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 :STANDARD cell is one WHOSE e.m.f. ALMOST does not change with temperature.

Discussion

33.	Assertion : We feel cold on touching the ice.Reason : Ice is a solid form of water.
Answer» If both assertion and REASON are TRUE and the reaction 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 the assertion and reason both are false. If assertion is false but reason is true. Solution :It is correct that on touching the ice we FEEL COLD because ice absorb heat from our hand.

Discussion

34.	Assertion : Water is specially effectivein screening the electrostatic interactions between the dissolved ions. Reason : The force of ionic interactions depends upon the dielectric constant (epsi) of the solvent .
Answer» If both the assertion and reason are true statement andreason is correct explanation of the assertion . If both the assertion and reason are true statement but reason is not a correct explanation of the assertion . If the assertion is true but the reason is a false statement. If both assertion and reason are false statements. Solution :The STRENGTH of the force (F) of the ionic interaction depends , upon the MAGNITUDE of charge (Q), the distance between them and the DIELECTRIC CONSTANT of solvent as ` F=(Q_(1)Q_(2))/(epsir^(2))` Waterhas highly value for ` epsi`and thus screens the interactions between ions more effectively .

Discussion

35.	Assertion : Water is a goodsolvent for ionic compounds butpoor one for covalentcompounds. Reason :Hydrogen energy of ionsrealeases sufficient energy toovercomelattice energy and break hydrogen bondsin water, white covalent bondedcompound interact soweakly that evenvan der wallsforce between molecule of convalent compounds cannotbe broken .
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 but reason is not the correct explanation of assertion Answer :C

Discussion

36.	Assertion : Water in liquid state is more stable than ice at room temperature. Reason : Water in liquid form has higher entropy than ice.
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. Answer :B

Discussion

37.	Assertion: Vitamin D cannot be stored in our body. Reason : Vitamin D is fat soluble vitamin and is excreted out of the body with urine.
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. Solution :Vitamine D is a fat SOLUBLE VITAMIN and can be stored in the body since it is not excreted out of the body.

Discussion

38.	Assertion: Vulcanisation increases the hardness of natural rubber. Reason : Vulcanisation introduces the polysulphide bridges at ractive sites.
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. Answer :A

Discussion

39.	Assertion : Vitamin D can be stored in our body . Reason : Vitamin Dis a fat soluble vitamin
Answer» SOLUTION :(A) and (R) are TRUE and (R) is the CORRECT explana,TION of (A)

Discussion

40.	Assertion : Vitamin D can be stored in our body. Reason : Vitamin D is fat soluble vitamin.
Answer» Assertion and reason both are correct statements and reason EXPLAINS the assertion. Both assertion and reason are wrong statements. Assertion is correct STATEMENT and reason is wrong statement. Assertion is wrong statement and reason is correct statement. SOLUTION :VITAMIN D is fat SOLUBLE , i.e., water insoluble and hence can be stored in the body.

Discussion

41.	Assertion: Vinyl halides are reactive towards nucleophilic substitution reactions. Reason: Reactivity is due to the polarity of the carbon halogen bond.
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 assertion: Vinyl halides are unreactive TOWARDS the nucleophilic SUBSTITUTION reactions. Correct reason: it is due to the presence of resonance which INTRODUCES PARTIAL double bond character in carbon halogen bond. .

Discussion

42.	Assertion : Vapour pressure of solvent increases when solvent B is added. Reason : B is more volatile therefor vapour pressure of B is greater than of A.
Answer» ANSWER :1

Discussion

43.	Assertion: van't Hoff factor of NaCl is expected to be equal to 3 Reason: NaCl is a binary electrolyte
Answer» Both ASSERTION and REASON are true and Reason is the correct EXPLANATION of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is false Both Assertion and Reason are false Answer :D

Discussion

44.	Assertion: Van't Hoff' s factor for benzoic acid is less than one. Reason: Benzoic acid behaves as a weak electrolyte in benzene.
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 A is false but R is true ANSWER :C

Discussion

45.	Assertion : Van't Hoff factor for benzoic acid in benzene solvent is less than 1. Reason : Benzoic acid gets associated in benzene which is non-polar solvent.
Answer» If both ASSERTION are REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are CORRCT but reason is not correct explanation for assertion. If assertion is corrct but reason is incorrect. If assertion and reason both are incrrect. Solution :Reason is the correct explanation for assertion.

Discussion

46.	Assertion. Van't Hoff factor for benzoic acid in benzene is less than one. Reason. Benzoic acid behaves as a weak electrolyte in benzene.
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 R. Benzoic acid BEHAVES as a weak electrolyte in WATER.

Discussion

47.	Assertion: Valine is an essential amino acids Reason: The lack of essential amino acids in the diet causes Kwashiorkor.
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 :VALINE is an ESSENTIAL amino acid. The amino ACIDS which the body cannot synthesize are called essential amino acid.

Discussion

48.	Assertion : Use of aspartame is limited to coldfoodsand soft drinks Reason : Aspartame is rougly 100 times as sweet as cane sugar .
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 :Aspartame is unstable at cooking temperature , hence its USE is limited to COLD foods and soft DRINKS.

Discussion

49.	Assertion : underset("-carbethoxy- 2-butenoic acid.")(CH-underset(COOC_(2)H_(5))underset(\|)(C)=CH-COOH) Reason: Principal functional group gets lowest number followed by double bond or triple bond.
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. Solution :`OVERSET(4)(C)H-underset(COOC_(2)H_(5))underset(\|)overset(3)(C)=overset(2)(CH)-overset(1)(C)OOH` Here, since -COOH is the principle functional grou, it gets the LOWEST number than the secondary functional GROUP (3-carbethoxy). So it is 3-carbethoxy-2-butenoic acid.

Discussion

50.	Assertion : Tyrosine behave as a acidic at pH =7 Reason: pK_(8) of phenol is mole than 7.
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 ASERTION and reason are false. Answer :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : When the alkyl group is small like -CH_(3) group, there is n steric hindrance to H-bonding. Reason (R) : In aniline or other arylamines, the -NH_(2) group is attached directly to the benzene ring.

Assertion : When protein is exposed to a higher temperature, it losses its three dimensional structure. Reason : Protein. when _denatured does not lose its biological function.

Assertion : When one solvent mixed with other solvent vapour pressure of one increases and other decreases. Reason : When any solute added into solvent ,vapour pressure of solvent decreases

Assertion : When one solvent mixed with other solvent, vapour pressure of one increases an decreases. Reason : When any solute added into solvent, vapour pressure of solvent decreases

Assertion. When NO reacts with FeSO_(4), a brown coloured complex is formed. Reason. In the complex, the coordination number of Fe is + 6.

Assertion. When NO reacts with FeSO_(4), a brown coloured complex is formed. Reason. In the complex, the coordination number of Fe is 6.

Assertion: When NaCl is added to water a depression in freezing point is observed Reason: The lowering in vapour pressure of a solution causes depression in freezing point.

Assertion : When NaCl is added to water, a depression in freezing point is observed. Reason : The lowering of vapour pressure of a solution cuaes depression in the freezing point.

Assertion : When NaCl is added to water a depression in freezing point is observed. Reason : The lowering of vapour pressure of a solution causes depression in the freezing point.

Assertion (A) When NaCl is added to water a depression in freezing point is observed. Reason (R ) The lowering of vapour pressure of a solution causes depression in the freezing point.

Assertion : When methyl alcohol is added to water, boiling point of water increases. Reason : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

Statement-1 : When metyl alcohol is added to water, boliling point of water increases. Statement-2 : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

Assertion : When methyl alcohol is added to water, boiling point of water increases. Reason : When a volatile solute is added to a volatile solvent, elevation in boiling point is observed.

Assertion : When KI solution is added to AgNO_(3) solution, negatively charged sol results . Reason : Negative charge of sol is due to preferential adsorption of iodide ions from the dispersion medium.

Assertion :When H_(2)S is passedthrough a solution of CuSO_(4) noprecipitate of CuS is abtain until the solutionis acidifiedwith HCI Reasion: The solutionproducts constant of CuS is not so high as to require a high concentration of S^(2-) for theprecipitateof CuS

Assertion: When H_(2)S is passed through a solution of CuSO_(4), no precipiate of CuS is obtained until the solution is acidifeid with HCl. Reason: The solubility product constant of CuS is not so high as to require a high concentration of S^(2-) for the precipitate of CuS.

Assertion :When H_(2)S is passedthrough a solutioncontaining [Cu(CN)_(4)]^(2-) and [Cd(CN)_(4)]^(2-) ions ,only cadinilumprecipitateas CdS. Reasion : The oxidationstateand coordination number of cadmiumin [Cd(CN)_(4)]^(2-) are 2 and 4 respectively.

Assertion : When borax is strongly heated it forms transparent glassy bead. Reason : Borax is the other name for sodium tetraborate decahydrate.

Assertion : When a starch is heated between 200 - 250^(@)C changes to dextrin. Reason : Starch solution gives a blue : I colour with iodine.

Assertion When a solution of non-volatile solute in volatile solvent is distilled, boiling point of the left-over solution increasesgradually. Reason Distillationincrease the molality of the left-over solution.

Assertion: When a solution of Na_(2)ZnO_(2) is acidified with dilute HCl and treated with H_(2)S, a precipitate of ZnS is formed. Reason: Na_(2)ZnO_(2) is decomposed by HCl to give Zn^(2+) ions.

Assertion : When a solutionof Na_(2)ZnO_(2) is acidified withdilute HCI and reactedwith H_(2)S a precipitate of ZnS is formed Reasion :Na_(2)ZnO_(2) is decomposed by HCI to give Zn^(2+) ions.

Assertion : When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side.Reason : Diffusion of colvent occurs from a region of high concentration solution to a region of low concentration solution.

Assertion : When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. Reason : Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.

Assertion : When a connection solution is diluted by acidic aqueous solution remains unchanged . Reason: Product of moles of aolute and volume is equal to the molarity.

Assertion : When 3 to 10% sulphur is added rubber becomes soft and stretchy. Reason : Physical properties of rubber are not altered by the amount of sulphur added.

Assertion :When 1.0 mol of NaCl is doped with 10^(-3) mol SrCl_2 , the number of cationic sites remaining vacant is 10^(-3). Reason :Each SrCl_2 unit produces tow cationic vacancy.

Assertion: wedge_(m) for weak electrolytes shows a sharp incrase when the electrolytic solution in diluted. Reason: For weak electrolytes, degree of dissociation increases with dilutio of solution.

Assertion: Weston is a standard cell. Reason: its e.m.f. does not change with temperature.

Assertion : We feel cold on touching the ice.Reason : Ice is a solid form of water.

Assertion : Water is specially effectivein screening the electrostatic interactions between the dissolved ions. Reason : The force of ionic interactions depends upon the dielectric constant (epsi) of the solvent .

Assertion : Water in liquid state is more stable than ice at room temperature. Reason : Water in liquid form has higher entropy than ice.

Assertion: Vitamin D cannot be stored in our body. Reason : Vitamin D is fat soluble vitamin and is excreted out of the body with urine.

Assertion: Vulcanisation increases the hardness of natural rubber. Reason : Vulcanisation introduces the polysulphide bridges at ractive sites.

Assertion : Vitamin D can be stored in our body . Reason : Vitamin Dis a fat soluble vitamin

Assertion : Vitamin D can be stored in our body. Reason : Vitamin D is fat soluble vitamin.

Assertion: Vinyl halides are reactive towards nucleophilic substitution reactions. Reason: Reactivity is due to the polarity of the carbon halogen bond.

Assertion : Vapour pressure of solvent increases when solvent B is added. Reason : B is more volatile therefor vapour pressure of B is greater than of A.

Assertion: van't Hoff factor of NaCl is expected to be equal to 3 Reason: NaCl is a binary electrolyte

Assertion: Van't Hoff' s factor for benzoic acid is less than one. Reason: Benzoic acid behaves as a weak electrolyte in benzene.

Assertion : Van't Hoff factor for benzoic acid in benzene solvent is less than 1. Reason : Benzoic acid gets associated in benzene which is non-polar solvent.

Assertion. Van't Hoff factor for benzoic acid in benzene is less than one. Reason. Benzoic acid behaves as a weak electrolyte in benzene.

Assertion: Valine is an essential amino acids Reason: The lack of essential amino acids in the diet causes Kwashiorkor.

Assertion : Use of aspartame is limited to coldfoodsand soft drinks Reason : Aspartame is rougly 100 times as sweet as cane sugar .

Assertion : underset("-carbethoxy- 2-butenoic acid.")(CH-underset(COOC_(2)H_(5))underset(|)(C)=CH-COOH) Reason: Principal functional group gets lowest number followed by double bond or triple bond.

Assertion : Tyrosine behave as a acidic at pH =7 Reason: pK_(8) of phenol is mole than 7.