94420 + Interview Questions in Chemistry in Class 12

1.	Assertion: Equivalent mass of K_(2) Cr_(2) O_(7) whenit actsas anoxidisingagentin acidicmediumis M// 6 Reason: Duringreductionoxidationnumberof chromiumchange from+6to + 3
Answer» Bothassertion andreasonare trueandreasonis thecorrectexplanation of thehassertion Bothassertionand reasonare truebutreasonis NOTTHE correctexplanationof THEASSERTION Assertionis truebut REASONIS FALSE Bothassertion andreasonare false. ANSWER :A

Discussion

2.	Assertion. Equal moles of different substances contain same number of constituent particles. Reason. Equal weights of different substances contain the same number of constituent particles.
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 assetion. If assertion is true, but reason if false If both assertion and reason are false. Solution :Correct R. EQUAL WEIGHTS of different substances do not contain the same number of constituent particles.

Discussion

3.	Assertion : Enzymes have active sites that hold substrate molecule for a chemical reaction. Reason: Drugs compete with natural substrate by attaching covalently to the active site of enzyme
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. Drugs compete with natural substrate by attaching by weak bonds (such as IONIC bonding, H-bonding, van DER Waals interaction, etc.) to the active site of the ENZYME.

Discussion

4.	Assertion (A) Enzymes have active sites that hold substrte molecule for a chemical reaction. Reason (R) Drugs compete with natural substrate by attaching convalency to the active site of enzyme.
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 in wrong statement. Answer :d

Discussion

5.	Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous 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 :D

Discussion

6.	Assertion : Entropy of ice is less than water. Reason : Ice have cage like structure.
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 :Entropy of ice is less than water because water molecules in solid state LOSE kinetic energy and hence their tendency of movement minimise. Hence entropy decrease in solid state. The reason that ice have CAGE LIKE structure is also correct but reason is not or correct explanation for assertion.

Discussion

7.	Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.
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 :D

Discussion

8.	Assertion : Enthalpy and entropy of any elementary substance in the standard state are taken as zero. Reason : At zero degree completely motionless.
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 :D

Discussion

9.	Assertion :- End systolic volume is 50ml Reason :- Stroke volume is 70ml
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 :A

Discussion

10.	Assertion. Empirical and molecular formula of Na_(2)CO_(3) is same. Reason. Na_(2)CO_(3) does not form hydrates.
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 assetion. If assertion is true, but reason if false If both assertion and reason are false. Solution :Correct R. `Na_(2)CO_(3)` FORMS the hydrates `Na_(2)CO_(3).10H_(2)O` and `Na_(2)CO_(3).H_(2)O`.

Discussion

11.	Assertion: E.m.f. and potential difference are same for cell. Reason: Both gives the difference in electrode potential under any condition.
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 :Both assertion and reason are false. POTENTIAL difference is the difference between the electrode potential of the TWO electrodes of the cell wen cell is under operation while e.m.f.is the potential difference generated by a cell when there is ZERO electron flow.

Discussion

12.	Assertion: Elevation in boiling point is inversely proportional to lowering of vapour pressure for dilute solutions. Reason: Lowering of vapour pressure is directly proportional to mole fraction of solvent.
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

13.	Assertion :- Elevation in boiling point and depression in freezing point are colligative properties. Reason :- All colligative properties are used for the calculation of molecular masses.
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 :Elevation in BOILING point and depression in freezing point are COLLIGATIVE properties because both depend only on the NUMBER of particles (ions or molecules) of the solute in a difinite AMOUNT of the SOLVENT but not on the nature of thesolute.

Discussion

14.	Assertion. Elementary phosphorus exists in three principal allotropic forms, i.e., white (yellow), red (or violet) and black. Reason. Of the three forms, white phosphorus is the most important and most reactive.
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 Solution :Correct explanation. Depending UPON whether `P_(4)` molecules EXIST as discrete molecules h eld together by weak van der waals forces or are covalently bonded with one another to form polymeric structures, phosphorus exists in three allotropic FORMS.

Discussion

15.	Assertion: Electron withdrawing groups decrease the acidity of carboxylic acids. Reason: Substituents affect the stability of the conjugate base and acidity of carboxylic acids.
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 assertion is false but reason is true. Solution :electron withdrawing GROUPS increase the acidity of carboxylic ACIDS by stabilising the conjugate base through delocalisation of the negative charge by inductive and resonance effect.

Discussion

16.	Assertion: Electron withdrawing groups in aryl halides decrease the reactivity towards nucleophilic substitution. Reason: 2,4-Dinitrochlorobenzene is less reactive than chlorobenzene.
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 assertion is false but reason is true Solution :Halobenzenes become REACTIVE to nucleophilic substitution reactions when electron withdrawing GROUPS (nitro, cyano) are present at ortho para POSITION. This is evident from the dinitrochlorobenzene than chlorobenzene.

Discussion

17.	Assertion :- Electron gain enthalpy strictly becomes less negative on moving down the group. Reason :- Size increases and addition of extra electron is close to nucleas on moving down the group.
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 :D

Discussion

18.	Assertion: Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason: Formation of oxygen at anode requires overvoltage.
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

19.	Assertion : Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason: Formation of oxygen at anode requires over voltage.
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. Solution :At the anode, the following oxidation reactions are possible. `Cl_((aq))^(-) to (1)/(2) Cl_(2(g))+e^(-),E_(CELL)^(THETA)=1.36V`. . (Oxidation) `H_(2)O_((l)) to (1)/(2)O_(2(g))+4H_((aq))^(+)+4e^(-) , E_(cell)^(Theta)=1.23V` . . (Oxidation) * Lower value of `E_(cell)` is preferred but due to over voltage CHLORINE is liberated at anode.

Discussion

20.	Assertion : Electrolysis of NaCl (aq) produces Na metal. Reason : Na^(+) ion is obtained at cathode.
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 assertion and reason both are incorrect. Solution :(d) Correct assertion. Electrolysis of NACL (aq) products NaOH, `H_(2)` and `Cl_(2)`. Correct reason. `H_(2)` is liberated at CATHODE.

Discussion

21.	Assertion:Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason:Formation of oxygen at anode requires overvoltage.
Answer» Both ASSERTION and REACTION are true and the reason is correct explanation for assertion Both assertion and reason are true and reason is not correct explanation for assertion ) Assertion is true but the reason is FALSE. Both assertion and reason are false. Solution :Reason is the correct explanation for assertion.

Discussion

22.	Assertion : Electrolysis of molten PbBr_(2) using platinum electrodes produces Br_(2) at anode. Reason : Br_(2) is obtained in gaseous state at room temperature.
Answer» If both assertion and reason are correct and reason is correct explanation for assertion. <BR>If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is INCORRECT. If assertion and reason both are incorrect. Solution :(c ) Currect reason. At ANODE `Br^(-)` ions are oxidised to `Br_(2)` . `2Br^(-) to Br_(2)+2e^(-)`.

Discussion

23.	Assertion: Electrolysis of molten CaH_(2) products hydrgen gas at anode. Reason: In CaH_(2), hydrogen is present in the form of H^(-).
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 :`CaH_(2) overset("melt")toCa^(2+)+2H^(-)` At andoe: `H^(-)toH+e^(-),H+HtoH_(2)` Hence, R is the CORRET explanation of A.

Discussion

24.	Assertion: Electrical conductivity of copper inicreases with increase in temperature. Reason: The electrical conductivity of metals is due to the motion of electrons.
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 assertion is false but reason is true. Solution :Electrical conductivity of copper decreases with increase in temperature because the METALLIC conductivity is due to the motion of ELECTRONS. On increasing temperature the motion of electron INCREASES which hindered in conductance of CURRENT. Hence, here assertion is false but the reason is true.

Discussion

25.	Assertion : Electro dialysis is carried out under the influence of electric field. Reason : The combination of three layers of charges around the sol particle is called Helmholtz double layer.
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

26.	Assertion. EDTA is a hexadentate ligand. Reason. Denticity of a ligand is given by number of lone pairs donated to central atom by a ligand.
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 :R is the CORRECT explanation of A.

Discussion

27.	Assertion: E_(cell) should have a positive value for the cell to function. Reason: E_("cathode") lt E_("anode")
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. Solution :Correct Reason: `E_(cell)=E_("CATHODE")-E_("anode").E_(cell)` is +ve when `E_("cathode")gtE_("anode")`.

Discussion

28.	Assertion : E_(cell)^(@) should have a positive value for the cell to function. Reason : E_("Cathode") lt E_("Anode")
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. Solution :Assertion is true but the reason is false. For the cell reaction to be FEASIBLE `E_("Cathode")` should be positive. `-DeltaG^(Theta)=nF" "E_(cell)^(Theta)` * `E_(cell)` for the VALUE of `E_(cell)` to be positive, `E_("Cathode") GT E_("Anode")`

Discussion

29.	Assertion : E_(Ag^(+)\|Ag)^(Theta) increases with increases in concentration of Ag^(+) ions. Reason : E_(Ag^(+)\|Ag)^(Theta) has a positive value.
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. Solution :`E_(CELL)=E_(cell)^(@)-0.059log1//[Ag^(+)]` therefore, `E^(@)Ag^(+)//Ag` INCREASES with increases in concentration of `Ag^(+)`.

Discussion

30.	Assertion: E_(Ag^(+)//Ag)^(@) increases with increase in concentration of Ag^(+) ions. Reason: E_(Ag^(+)//Ag) has a positive value.
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. Solution :Correct explanation. `Ag^(+)+E^(-)TOAG,E_(Ag^(+)//Ag)+E_(Ag^(+)//Ag)^(@)-(RT)/(nF)"LOG"(1)/([Ag^(+)])`

Discussion

31.	Assertion:E_(Ag^(+)//Ag increases with in concentration of Ag^(+) ions. Reason:E_(Ag^(+)//Ag) has a positive value.
Answer» Both assertion and reaction are true and the reason is CORRECT explanation for assertion Both assertion and reason are true and reason is not correct explanation for assertion ) Assertion is true but the reason is False. Both assertion and reason are false. Solution :Reason is not the correct explanation for assertion as concentation of `Ag^(+)` IONS increases, more ions are REDUCED to the metallic from. Therefore, `E_(Ag^(+)//Ag)` increases.

Discussion

32.	Assertion. E^(@) for Mn^(3+)//Mn^(2+) is more positivethan for Cr^(3+) //Cr^(2+) . Reason. The thirdionization energy of Mn is larger than that of Cr.
Answer» SOLUTION :R is the CORRECT EXPLANATION OFA.

Discussion

33.	Assertion : E_(a) of the forward reaction is higher than that of backward reaction in a reversible endothermic reaction. Reason : Increasing the tempreature of the substance increases the fraction of molecules which collide with energies greater than E_(a).
Answer» If both assertion and reason are TRUE and reason is the correct explanation of assertion. If both assertion and reason are true butreason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :Threshold energy of reactants is less than that of products in reversable endothermic reactions hence, `E_(a)` for FORWARD REACTION is more than `E_(a)` for backward reaction

Discussion

34.	Assertion : During test for nitrogen with Lassaigne extract on adding FeCl_(3) obtain solution sometimes a red precipitate is obtained. Reason :Sulphur is also present.
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 RESON 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 :On ADDING `FeCl_(3)` solution of sodium extrac during testing for nitrogen a red precipitate is obtained. It is due to the presence of SULPHUR also. `3NaCNS + FeCl_(3) rarr underset(" Red colour")(Fe(CNS)_(3) + 3NaCl)`

Discussion

35.	Assertion :- During physical adsorption multimolecular layers are formed. Reason :- For physical adsorption value of Delta H=-20 to -40 kJ/mol.
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 :B

Discussion

36.	Assertion : During digestion with concentrated H_(2)SO_(4), Nitrogenof the organic compound is converted into (NH_(4))_(2)SO_(4). Reason : (NH_(4))_(2)SO_(4)On heating with akali liberatesNH_(3).
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 RESON 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 :N//A

Discussion

37.	Assertion : During a chemical reaction, total moles remains constant. Reason: During a chemical reaction, total mass remains constant.
Answer» Statement-1 is TRUE, statement-2 is true and statement-2 is CORRECT explanation for statement-1. Statement-1 is true, statement-2 is TRUEAND statement-2 is NOT the correct explanation for statement-1 Statement-1 is false, statement -2 is true. Statement -1 is true, statement-2 is false. Answer :D

Discussion

38.	Assertion : due to Frenkel defect, density of the crystalline solid decreases. Reason : in Frenkel defect cation and anion leaves the crystal.
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. Both assertion and reason are false Solution :Both assertion and reason are false

Discussion

39.	Assertion : Dry SO_(2) does not bleach dry flowers Reason: The bleaching action of SO_(2) is due to its readucing nature
Answer» Statement-I and Statement-II are CORRECT and Statement-II is correct EXPLANATION of Statement-I Statement-I and Statement-II are correct and Statement-II is not correct explanation of Statement-I Statement-I is correct and Statement-II is not correct Statement-I is not correct and Statement-II is correct Answer :B

Discussion

40.	Assertion- Diusruption of the natural structure of a protein is called denaturation. Reason : The change in colour and appearance of egg during cooking is due to denaturation.
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 explanations of Assertion. Assertion is true but Reason is False. Both Assertion & Reason are False Solution :Due to denaturation a protein LOSES its biological activity. During denaturation, the protein molecule UNCOILS and form a more random conformation and PRECIPITATES from the solution.

Discussion

41.	Assertion : Dissolution of concentrated H_(2)SO_(4) in water is highly exothermic process. Reason : Sulphuric acid is always diluted by adding acid to water slowly.
Answer» Both ASSERTION and reason are TRUE and reason is the CORRECT explanation of the assertion Both assertion and reason are true and reason is not the correct explanation of the assertion. Assertion is true but reason is false Both assertion and reason are false. Answer :A::B::C::D

Discussion

42.	Assertion: Disruption of the natural structural of a protein is called denaturation. Reason: The change in colour and apperance of egg during cooking is due to denaturation.
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 :Due to denaturation , a protein LOSES its biological activity. During denaturation, the protein molecule UNCOILS and form a more random conformation and precipitates from the solution.

Discussion

43.	Assertion : Dipole moment of NF_(3) is less than that of NH_(3). Reason : polarity of N-F bond is less than that of N-H bond.
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 :A

Discussion

44.	Assertion : Direct attachment of groups such as phenyl or vinyl to the carboxylic acid, increases the acidity of the carboxylic acid. Reason : Resonance effect always increases the acidity of carboxylic acids.
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 :This is due to greater ELECTRONEGATIVITY of `sp^(2)` hybridised carbon to which carboxyl carbon is attached.

Discussion

45.	Assertion : Dinegative anion of oxygen (O^(2-)) is quite common but dinegative anion of sulphur (S^(2-)) is less common. Reason : Covalency of oxygen is two.
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 a correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false Answer :B

Discussion

46.	Assertion : Dinegativeanion of oxygen(O^(2-))is quite common but dinegativeanion of sulphur(S^(2-))is less common. Reason : Covalency of oxygen is two.
Answer» If both the ASSERTION and reason are true andreason is CORRECT EXPLANATION of the assertion . If both the assertion and reason are true but reason is not a correct explanation of the assertion . If the assertion is true but the reason is false. If both assertion and reason are false. Solution :Oxygen is second most electronegative ELEMENT afterfluorine . So it can easily gain electrons to form dinegative ANION ` (O^(2-))`while sulphur is not so electronegative element as oxygen.

Discussion

47.	Assertion: Diastereomers hae different physical properties. Reason: These are non-superimporsable mirror images.
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 :Diastereomers differ in physical properties because of different CONFIGURATIONS.

Discussion

48.	Assertion : Diastereoisomers have different physical properties. Reason : They are non-superimposable mirror images.
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 and the 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 :Diastereoisomers are MIRROR images.

Discussion

49.	Assertion : Diagonal relationship is shown between Be and Al. Reason : Ionization potential of Be is almost the same as that of Al.
Answer» If both (A) and (R) are TRUE and (R) is the \CORRECT explanation of (A) If both (A) and (R) are true but (R) is not correct explanation of (A) If (A) is true but (R) is FALSE If (A) is false and (R) is true Answer :C

Discussion

50.	Assertion : Detergents with straight chain of hydrocarbons are preferredover branched chain. Reason : Detergentswith brached chain hydrocarbon part are expensive.
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 :Detergents with branched chain hydrocarbonpart are non-biodegradableas bacteria cannot DEGRADE them easily .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: Equivalent mass of K_(2) Cr_(2) O_(7) whenit actsas anoxidisingagentin acidicmediumis M// 6 Reason: Duringreductionoxidationnumberof chromiumchange from+6to + 3

Assertion. Equal moles of different substances contain same number of constituent particles. Reason. Equal weights of different substances contain the same number of constituent particles.

Assertion : Enzymes have active sites that hold substrate molecule for a chemical reaction. Reason: Drugs compete with natural substrate by attaching covalently to the active site of enzyme

Assertion (A) Enzymes have active sites that hold substrte molecule for a chemical reaction. Reason (R) Drugs compete with natural substrate by attaching convalency to the active site of enzyme.

Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous reaction.

Assertion : Entropy of ice is less than water. Reason : Ice have cage like structure.

Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

Assertion : Enthalpy and entropy of any elementary substance in the standard state are taken as zero. Reason : At zero degree completely motionless.

Assertion :- End systolic volume is 50ml Reason :- Stroke volume is 70ml

Assertion. Empirical and molecular formula of Na_(2)CO_(3) is same. Reason. Na_(2)CO_(3) does not form hydrates.

Assertion: E.m.f. and potential difference are same for cell. Reason: Both gives the difference in electrode potential under any condition.

Assertion: Elevation in boiling point is inversely proportional to lowering of vapour pressure for dilute solutions. Reason: Lowering of vapour pressure is directly proportional to mole fraction of solvent.

Assertion :- Elevation in boiling point and depression in freezing point are colligative properties. Reason :- All colligative properties are used for the calculation of molecular masses.

Assertion. Elementary phosphorus exists in three principal allotropic forms, i.e., white (yellow), red (or violet) and black. Reason. Of the three forms, white phosphorus is the most important and most reactive.

Assertion: Electron withdrawing groups decrease the acidity of carboxylic acids. Reason: Substituents affect the stability of the conjugate base and acidity of carboxylic acids.

Assertion: Electron withdrawing groups in aryl halides decrease the reactivity towards nucleophilic substitution. Reason: 2,4-Dinitrochlorobenzene is less reactive than chlorobenzene.

Assertion :- Electron gain enthalpy strictly becomes less negative on moving down the group. Reason :- Size increases and addition of extra electron is close to nucleas on moving down the group.

Assertion: Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason: Formation of oxygen at anode requires overvoltage.

Assertion : Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason: Formation of oxygen at anode requires over voltage.

Assertion : Electrolysis of NaCl (aq) produces Na metal. Reason : Na^(+) ion is obtained at cathode.

Assertion:Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason:Formation of oxygen at anode requires overvoltage.

Assertion : Electrolysis of molten PbBr_(2) using platinum electrodes produces Br_(2) at anode. Reason : Br_(2) is obtained in gaseous state at room temperature.

Assertion: Electrolysis of molten CaH_(2) products hydrgen gas at anode. Reason: In CaH_(2), hydrogen is present in the form of H^(-).

Assertion: Electrical conductivity of copper inicreases with increase in temperature. Reason: The electrical conductivity of metals is due to the motion of electrons.

Assertion : Electro dialysis is carried out under the influence of electric field. Reason : The combination of three layers of charges around the sol particle is called Helmholtz double layer.

Assertion. EDTA is a hexadentate ligand. Reason. Denticity of a ligand is given by number of lone pairs donated to central atom by a ligand.

Assertion: E_(cell) should have a positive value for the cell to function. Reason: E_("cathode") lt E_("anode")

Assertion : E_(cell)^(@) should have a positive value for the cell to function. Reason : E_("Cathode") lt E_("Anode")

Assertion : E_(Ag^(+)|Ag)^(Theta) increases with increases in concentration of Ag^(+) ions. Reason : E_(Ag^(+)|Ag)^(Theta) has a positive value.

Assertion: E_(Ag^(+)//Ag)^(@) increases with increase in concentration of Ag^(+) ions. Reason: E_(Ag^(+)//Ag) has a positive value.

Assertion:E_(Ag^(+)//Ag increases with in concentration of Ag^(+) ions. Reason:E_(Ag^(+)//Ag) has a positive value.

Assertion. E^(@) for Mn^(3+)//Mn^(2+) is more positivethan for Cr^(3+) //Cr^(2+) . Reason. The thirdionization energy of Mn is larger than that of Cr.

Assertion : E_(a) of the forward reaction is higher than that of backward reaction in a reversible endothermic reaction. Reason : Increasing the tempreature of the substance increases the fraction of molecules which collide with energies greater than E_(a).

Assertion : During test for nitrogen with Lassaigne extract on adding FeCl_(3) obtain solution sometimes a red precipitate is obtained. Reason :Sulphur is also present.

Assertion :- During physical adsorption multimolecular layers are formed. Reason :- For physical adsorption value of Delta H=-20 to -40 kJ/mol.

Assertion : During digestion with concentrated H_(2)SO_(4), Nitrogenof the organic compound is converted into (NH_(4))_(2)SO_(4). Reason : (NH_(4))_(2)SO_(4)On heating with akali liberatesNH_(3).

Assertion : During a chemical reaction, total moles remains constant. Reason: During a chemical reaction, total mass remains constant.

Assertion : due to Frenkel defect, density of the crystalline solid decreases. Reason : in Frenkel defect cation and anion leaves the crystal.

Assertion : Dry SO_(2) does not bleach dry flowers Reason: The bleaching action of SO_(2) is due to its readucing nature

Assertion- Diusruption of the natural structure of a protein is called denaturation. Reason : The change in colour and appearance of egg during cooking is due to denaturation.

Assertion : Dissolution of concentrated H_(2)SO_(4) in water is highly exothermic process. Reason : Sulphuric acid is always diluted by adding acid to water slowly.

Assertion: Disruption of the natural structural of a protein is called denaturation. Reason: The change in colour and apperance of egg during cooking is due to denaturation.

Assertion : Dipole moment of NF_(3) is less than that of NH_(3). Reason : polarity of N-F bond is less than that of N-H bond.

Assertion : Direct attachment of groups such as phenyl or vinyl to the carboxylic acid, increases the acidity of the carboxylic acid. Reason : Resonance effect always increases the acidity of carboxylic acids.

Assertion : Dinegative anion of oxygen (O^(2-)) is quite common but dinegative anion of sulphur (S^(2-)) is less common. Reason : Covalency of oxygen is two.

Assertion : Dinegativeanion of oxygen(O^(2-))is quite common but dinegativeanion of sulphur(S^(2-))is less common. Reason : Covalency of oxygen is two.

Assertion: Diastereomers hae different physical properties. Reason: These are non-superimporsable mirror images.

Assertion : Diastereoisomers have different physical properties. Reason : They are non-superimposable mirror images.

Assertion : Diagonal relationship is shown between Be and Al. Reason : Ionization potential of Be is almost the same as that of Al.

Assertion : Detergents with straight chain of hydrocarbons are preferredover branched chain. Reason : Detergentswith brached chain hydrocarbon part are expensive.