94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Milion's test is a test to identify carbohydrates. Reason: Milions' reagent is solution of mercurous nitrate and mercuric nitrate in nitric acid contaning little nitrous acid.
Answer» If both ASSERTION and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are truebut 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 :Millons test is a test for proteins. When MILLION's reagent is added to the aqueous solution of a PROTEIN, a white PRECIPITATE is formed.

Discussion

2.	Assertion. Mn atom loses ns electrons first during ionization as compared to (n-1) d electrons. Reason. The effective nuclear charge experiencedby ( n-1) d electrons is greater than that of ns electrons.
Answer» SOLUTION :R is the CORRECTEXPLANATION of A.

Discussion

3.	Assertion: Mg^(2+)+ZnSO_(4) to MgSO_(4)+Zn^(2+) Reason: More active metal can displace less active metal from its salt solution.
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 Solution :`Mg^(2+)_Zn^(2+)+SO_(4)^(2+) to Mg^(2+)+SO_(4)^(2-)+Zn^(2+)` (no REACTION)

Discussion

4.	Assertion: Methyl cyanide has higher boiling point than methyl isocyanide. Reason: Dipole moment of methyl cyanide is higher than that of methyl isocyanide.
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are TURE, 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

5.	Assertion: Mg gets oxidised when heated in CO_(2) atmosphere. Reason: Mg has a strongly affinity for oxygen.
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 Solution :`2Mg+CO_(2) overset(DELTA)(to)2MgO+C` Mg is a strong AGENT and have great affinity for `O_(2)` at high temperature.

Discussion

6.	Assertion: Mg is not present in enamel of human teeth. Reason : Mgis an essential element for biological functions of human
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 nto the correct exaplation 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 true but reason is not correct explanation of the assertion. Enamel the hardest substance of the BODY is composed of fluorine not magnesium. Magnesium is an essential element as it acts as a FACTOR of many enzymes of glycolysis and a number of other metabolic reactions dependent UPON ATP.

Discussion

7.	Assertion : Metal deficiency defect can be seen in FeO. Reason: Li compound (LiCl) has pink colour due to F-centres.
Answer» Both Assertion and REASON are CORRECT and Reason is correct EXPLANATION of Assertion. Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion Assertion is correct, Reason is FALSE. Both Assertion and Reason are false. ANSWER :B

Discussion

8.	Assertion : Metal hydroxides are better antacids than hydrogencarbonates . Reason : Being insoluble metal hydroxides do notincrease the pH above neutrality .
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

9.	Assertion. Mercury vapour have shining silvery appearance. Reason. Mercury isa metal withshining silvery appearance.
Answer» SOLUTION :Correct A. Mercury vapours are invisible and no metallic bonding is possible in vapour state. CorrectR. Mercury is a liquid METAL with SHINING SILVERY appearance.

Discussion

10.	Assertion : Mercury vapour is shining silvery in appearance. Reason : Mercury is a metal with shining silvery appearance.
Answer» If both ASSERTION and reason are true and the reason is not thecorrect 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. It the assertion and reason both are false. Solution :Both assertion and reason AARE false. MERCURY VAPOUR are invisible as metallic bonding is vapour state.

Discussion

11.	Assertion.Mercury is not considered as a transition element. Reason. Mercury is liquid.
Answer» Solution :CORRECT explanation . MERCURY has completely filled d-subshell

Discussion

12.	Assertion : Mercury cell does not give steady potential. Reason : In the cell reaction, ions are not involved in 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. Assertion is false but reason is true Solution :Correct assertion is mercury cell gives steady POTENTIAL.

Discussion

13.	Assertion:Mercury cell does not give steady potential. Reason:In the cell reaction, ions are not involved in solution.
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 :Assertion is fales. MERCURY cell actuallt GIVES a sterady potential (1.35 V) throughout its life.

Discussion

14.	Assertion: Mercury cell does not give steady potential. Reason: In the cell reaction, inons are not involved in 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. Assertion is false but reason is true. Solution :Correct Assertion. Mercury CELL gives a steady potential.

Discussion

15.	Assertion: Melting point of Mn is more than that of Fe. Reason : Mn has higher number of unpaired e^(2) than Fe in atomic state.
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 :D

Discussion

16.	Assertion : Mass and volume are extensive properties. Reason : Mass / volume is also an extensive parameter.
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 :MASS and VOLUME are EXTENSIVE PROPERTIES. Mass/volume is not an extensive parameter. It is INTENSIVE property.

Discussion

17.	Assertion : Mass number of an atom is equal to total number of nucleons present in the nucleus Reason :Mass number defines the identity of an atom
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 EXPLANANTION of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Atominc number of PROTONS in its NUCLEUS

Discussion

18.	Assertion : Maltose is a reducing sugar which gives two moles of D-glucose on hydrolysis. Reason : Maltose has a 1,4-beta-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 reason : Maltose has a 1,4`ALPHA`-glycosidic linkage.

Discussion

19.	Assertion: Malonic acid (HOOC-CH_(2)-COOH) does not form cyclic anhydride on heating. Reason: It is like beta-keto acid, on heating, it prefers to decarboxylate.
Answer» if both ASSERTION and RESON 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

20.	Assertion : Maltose and lactose are examples of reducing sugars. Reason : Maltose and lactose reduce Fehling’s solution and Tollens’ reagent.
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

21.	Assertion: magnitude of electron gain enthalpy of oxygen is less than that of fluorine but greater than that of nitrogen. Reason: Ionisation enthalpy order is as follows: N gt O lt F.
Answer» If both ASSERTION and REASON are true annd the 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 the reason is false if assertion is false but the reason is true Answer :B

Discussion

22.	Assertion : Magnetic moment values of actinides are lesser than the theoretically predicted values. Reason : Actinide elements are strongly paramagnetic.
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 : The magneticmoments are lesser than the fact that 5f ELECTRONS of actinides are less EFFECTIVELY shielded which results in quenchingoforbitalcontribution.

Discussion

23.	Assertion : Magnetic moment of Dy is the highest among langthanoids. Reason : Orbital motion contributes magnetic moment.
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 reasonb is false If both assertion and reason are false. Solution :The MAGNETIC moment of transition elements may be calculated from the equation : `mu_(S+L)=sqrt(4S(S+1)+L(L+1))` S = resultant SPIN quantum number L = resultant orbital momentum quantum number `mu = g sqrt(J(J+1))` where `g=(3)/(2)+(S(S+1)-L(L+1))/(2J(J+1))` we know, J = L - S when the shell is less than half full. J = L + S when it is more than half full. Electronic configuration of `Dy=[Xe]4f^(10)6s^(2)` `Dy^(3+)=[Xe]4f^(9)` Here S = 5/2 (since there are five unpaired electron) `L = -1xx1+0xx1+1xx1+2xx1+3xx1=5` So, `J =L+S=15//2` Now, `g=(3)/(2)+(35//4-30)/(2xx(15)/(2)xx(17)/(2))=1.334` `mu = g sqrt(J+(J+1))=10.65 BM` Thus calculated VALUE of magnetic moment of Dy is the highest among the LANTHANOID.

Discussion

24.	Assertion: Magnesium continue to burn in nitric oxide. Reason : During burning heat evolved to not decompose NO
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 NTO the correct exaplation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :When Mg is burnt in nitric oxide it continue to BURN because during burning the heat EVOLVED decompose NO to `N_(2)` and `O_(2)`. Oxygen thus, produced HELPS Mg to burn. Here assertion is true but reason is false.

Discussion

25.	Assertion : Magnesium can be prepared by the electrolysis of aq. MgCl_2 . Reason : The reduction potential of Mg^(2+)is much lower than that of H^(+) .
Answer» If both Assertion and REASON are true and Reason is the CORRECT EXPLANATION of Assertion. If both Assertion and Reason are true and Reason is not the correct explanation of Assertion. If Assertion is true and Reason is false. If Assertion is false and Reason is true Answer :D

Discussion

26.	Assertion : Lyophilic sols are reversible sols. Reason :Lyophilic sols can be reconstituted bysimply remixing the dispersed phase and 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 Answer :A

Discussion

27.	Assertion : Lyophillic colloids are highly stable. Reason : Lyophillic colloids have definite force of attraction between dispersion medium and dispersed phase.
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 :A

Discussion

28.	Assertion : Lyophilic colloids are more stable than lyophobic colloids. Reason : In lyophobic system, the dispersed particles are moresolvated than in lyophilic system.
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

29.	Assertion : Lower members of carbonyl compounds are water soluble. Reason : These compounds are of polar nature.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct and reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If assertion as well as reason are both incorrect. Solution :Correct explanation. These are SOLUBLE in water because of `H`-bonding

Discussion

30.	Assertion : Low density polythene is used to make buckets , dustbins, bottles etc. Reason : Low density polythene consists of linear molecules and has close packing .
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 :High density polythene is USED to make buckets, dustbins, bottles etc. Low density polythene has highly branched structure .

Discussion

31.	Assertion : Low level of noradrenaline causes depression. Reason : Equanil is used in controlling depression .
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 :If the level of noradrenaline is low then the signal SENDING activitybecomes low and person suffers from depression.

Discussion

32.	(A) Lower aldehydes and ketones are soluble in water but solubility decrease as the molecular masses increase. (R) Distinction between aldehydes and ketones can be made by Tollen's reagent.
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 :It is true that lower aldehyde and ketones are soluble in water but as the molecular mass increases their solubility decreases. On ADDING Tollen's reagent to a solution of Carbonyl compound if SILVER mirror is obtained than it is aldehyde. THEREFORE Tollen's reagent is used for the identification of aldehydes and ketones. Here, assertion and reason both are true but the reason is not the correct explanation of assertion.

Discussion

33.	Assertion : Lithium forms lithium oxide (LiO_(2)) Reason : N_(2) molecule have unpaired 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 nto the correct exaplation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Because `Li_(2)O` is formed not `LiO_(2)`. `N_(2)` MOLECULE does not have the UNPAIRED electron (MOT)

Discussion

34.	Assertion : Lithium carbonate is not so stable to heat. Reason : Lithium being very small in size polarizes large CO_(2)^(3)ion leadingto thefomationof morestableLi_(2) )Oand CO_(2)
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 : BothAssertionand Reasonare true butReasonis notthe correctexplanation ofstatement- 1.` [Fe ( CN) _6 ]^ (3 -) `isweaklyparamagneticasitunpairedelectronswhile` [Fe (CN) _6]^ (2 -) `hasnounpairedelectron. `therefore`It is diamagnetic.

Discussion

35.	Assertion : LiquidNH_3is used for refrigeration Reasong: Liquid NH_3quickly vaporises.
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 :Liq `NH_3` has high heat heart of vaporisation `(327 CAL //g )` so.it is takes up lots of heat and helps in COOLING. So it is use d ice- plants.

Discussion

36.	Assertion : Linkage isomerism arises in coordination compounds containing ambidentate ligand. Reason : Ambidentate ligand has two different donor atoms.
Answer» ANSWER :a

Discussion

37.	Assertion: Limestone addes in the blast furance decomposes to give CaO which forms slag in molten state and separates out from ironReason : The iron obtained from the blast furnace contains about 4% carbon and many impurities like S,P,Si, Mn, etc.
Answer» If both assertion and reason are true and reason is the correct EXPLANATION of assertion . IFBOTH 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 :B

Discussion

38.	Assertion: Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid. Reason: Lewis aciid polarises the bromine molecule.
Answer» ASSERTION and reason both are correct and reason is correct explanation of assertion. Assertion and reason both are wrong statement. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Correct assertion. Bromination of benzene but not of PHENOL is carried out in presence of a Lewis ACID.

Discussion

39.	Assertion: Lime water becomes trubid on passing CO_(2) but becomes clear on passing more CO_(2). Reason: Lime water is calcium hydroxide, Ca(OH)_(2).
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 :Lime water become turbid on PASSING `CO_(2)` into it because both REACTS to produce insoluble calcium carbonate. `underset("Lime water")(Ca(OH)_(2))+CO_(2)to underset("Calcium carbonate (Insoluble)")(CaCO_(3))+H_(2)O` If more `CO_(2)` is passed then soluble calcium BICARBONATE is formed which clear the solution `underset("Insoluble")(CaCO_(3))+H_(2)O+CO_(2) to underset("Calcium bicarbonate (soluble)")(Ca(HCO_(3))_(2)` The reason that lime water is `Ca(OH)_(2)` is also correct. Here, both assertion and reason are correct but reason is not a correct explanation of assertion.

Discussion

40.	Assertion: Li_(2)SO_(4) does not form double salt like alum Reason: Li reacts with NH_(3) gas to form LiNH_(2)
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 Solution :Among sulphate salt of alkali metals only `Li_(2)SO_(4)` does not forms alum, as `Li^(+)` has very small size. `2LiI+NH_(3)(G) overset(Delta)(to)Li_(2)NH+H_(2)(uarr)

Discussion

41.	Assertion: Less substituted alkenes are formed in both Hoffmann and Cope elimination reactions. Reason: Hoffmann elimination and Cope elimination both are syn elimination reactions.
Answer» If both assertion and reason are correct, and reason is the correct EXPLANATION of the assertion if both assertion and reason are correct, but reason is NOT the correct explanation of the assertion. If assertion is Correct, but reason in INCORRECT. If assertion is Incorrect, but reason is correct Answer :C

Discussion

42.	Assertion: Lead, tin and bismuth are purified by liquationmethod. Reason : Lead, tin and bismuth have low m.p. as compared to impurities.
Answer» If both assetion and REASON are CORRECT, and reason is the CORRECT EXPLANATION of the ASSERTION If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion If assertion is CORRECT but reason is INCORRECT If assertion is INCORRECT but reason is CORRECT Answer :A

Discussion

43.	Assertion : Levigation is used for the separation of oxide ores from impurities Reason : Ore particles are removeed by wahing in a current of water
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 :ASSERTIONS is true, but reason is false. Oxide ores being heavier than the earthy or rocky gangue particles. Settle down while LIGHTER IMPURTIES are washed away.

Discussion

44.	Assertion: Li is most strong reducing agent among alkali metals Reason: hydration energy of Li^(+) is maximum among the alkali metals.
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 :A

Discussion

45.	Assertion : Leaching is a process of reduction. Reason : Leaching involves treatment of the ore with a sutable reagent so as to make it soluble while impurites remains insoluble.
Answer» If both assertion and REASON are true and the reason is the CORRECT EXPLANATION of the assertion If boht assretion and reasons 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 :LEACHING is PROCESS of concentration.

Discussion

46.	Assertion :La(OH)_(3) islessbasicthan Lu (OH)_(3) Reason : Basiccharacter ofhydroxidesoflanthanides increasesonmovingfrom La^(3+) to Lu^(3+)
Answer» bothassertionand reasonare truereasonis thecorrectexplanationof THEASSERTION . bothassertinandreasonare truebutreasonis notcorrectexplanationof theassertion Assertionis truebutreasonis FALSE Bothassertionand reasonare false. Answer :D

Discussion

47.	Assertion. Langmuir adsorption is a single layer phenomenon. Reason. It is due to van der Walls forces.
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 :Correct R. The single layer FORMED may be DUE to van der Waals adsorption or CHEMISORPTION.

Discussion

48.	Assertion : Lamda_(m) for weak electrolytes shows a sharp increase when the electrolytic solution is diluted. Reason: For weak electrolytes degree of dissociation increases with dilution 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. Solution :For weak electrolyte `Lamda_(m)` INCREASES steeply on dilution DUE to increase in the NUMBER of ions (or the DEGREE of dissociation).

Discussion

49.	Assertion:Lambda_(m) for weak electrolytes shows a sharp increase when the electrolytic solution is diluted. Reason:For weak electrolytes degree of dissociation increases with dilution of solution.
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

50.	Assertion : K,Rb and Cs form superoxides. Reason : The stability of the superoxide increases from 'K' to Cs due to decrease in lattice energy
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 nto the correct exaplation of the assertion If assertion is true but reason is false If the assertion and reason both are false Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Milion's test is a test to identify carbohydrates. Reason: Milions' reagent is solution of mercurous nitrate and mercuric nitrate in nitric acid contaning little nitrous acid.

Assertion. Mn atom loses ns electrons first during ionization as compared to (n-1) d electrons. Reason. The effective nuclear charge experiencedby ( n-1) d electrons is greater than that of ns electrons.

Assertion: Mg^(2+)+ZnSO_(4) to MgSO_(4)+Zn^(2+) Reason: More active metal can displace less active metal from its salt solution.

Assertion: Methyl cyanide has higher boiling point than methyl isocyanide. Reason: Dipole moment of methyl cyanide is higher than that of methyl isocyanide.

Assertion: Mg gets oxidised when heated in CO_(2) atmosphere. Reason: Mg has a strongly affinity for oxygen.

Assertion: Mg is not present in enamel of human teeth. Reason : Mgis an essential element for biological functions of human

Assertion : Metal deficiency defect can be seen in FeO. Reason: Li compound (LiCl) has pink colour due to F-centres.

Assertion : Metal hydroxides are better antacids than hydrogencarbonates . Reason : Being insoluble metal hydroxides do notincrease the pH above neutrality .

Assertion. Mercury vapour have shining silvery appearance. Reason. Mercury isa metal withshining silvery appearance.

Assertion : Mercury vapour is shining silvery in appearance. Reason : Mercury is a metal with shining silvery appearance.

Assertion.Mercury is not considered as a transition element. Reason. Mercury is liquid.

Assertion : Mercury cell does not give steady potential. Reason : In the cell reaction, ions are not involved in solution.

Assertion:Mercury cell does not give steady potential. Reason:In the cell reaction, ions are not involved in solution.

Assertion: Mercury cell does not give steady potential. Reason: In the cell reaction, inons are not involved in solution.

Assertion: Melting point of Mn is more than that of Fe. Reason : Mn has higher number of unpaired e^(2) than Fe in atomic state.

Assertion : Mass and volume are extensive properties. Reason : Mass / volume is also an extensive parameter.

Assertion : Mass number of an atom is equal to total number of nucleons present in the nucleus Reason :Mass number defines the identity of an atom

Assertion : Maltose is a reducing sugar which gives two moles of D-glucose on hydrolysis. Reason : Maltose has a 1,4-beta-glycosidic linkage.

Assertion: Malonic acid (HOOC-CH_(2)-COOH) does not form cyclic anhydride on heating. Reason: It is like beta-keto acid, on heating, it prefers to decarboxylate.

Assertion : Maltose and lactose are examples of reducing sugars. Reason : Maltose and lactose reduce Fehling’s solution and Tollens’ reagent.

Assertion: magnitude of electron gain enthalpy of oxygen is less than that of fluorine but greater than that of nitrogen. Reason: Ionisation enthalpy order is as follows: N gt O lt F.

Assertion : Magnetic moment values of actinides are lesser than the theoretically predicted values. Reason : Actinide elements are strongly paramagnetic.

Assertion : Magnetic moment of Dy is the highest among langthanoids. Reason : Orbital motion contributes magnetic moment.

Assertion: Magnesium continue to burn in nitric oxide. Reason : During burning heat evolved to not decompose NO

Assertion : Magnesium can be prepared by the electrolysis of aq. MgCl_2 . Reason : The reduction potential of Mg^(2+)is much lower than that of H^(+) .

Assertion : Lyophilic sols are reversible sols. Reason :Lyophilic sols can be reconstituted bysimply remixing the dispersed phase and dispersion medium.

Assertion : Lyophillic colloids are highly stable. Reason : Lyophillic colloids have definite force of attraction between dispersion medium and dispersed phase.

Assertion : Lyophilic colloids are more stable than lyophobic colloids. Reason : In lyophobic system, the dispersed particles are moresolvated than in lyophilic system.

Assertion : Lower members of carbonyl compounds are water soluble. Reason : These compounds are of polar nature.

Assertion : Low density polythene is used to make buckets , dustbins, bottles etc. Reason : Low density polythene consists of linear molecules and has close packing .

Assertion : Low level of noradrenaline causes depression. Reason : Equanil is used in controlling depression .

(A) Lower aldehydes and ketones are soluble in water but solubility decrease as the molecular masses increase. (R) Distinction between aldehydes and ketones can be made by Tollen's reagent.

Assertion : Lithium forms lithium oxide (LiO_(2)) Reason : N_(2) molecule have unpaired electrons

Assertion : Lithium carbonate is not so stable to heat. Reason : Lithium being very small in size polarizes large CO_(2)^(3)ion leadingto thefomationof morestableLi_(2) )Oand CO_(2)

Assertion : LiquidNH_3is used for refrigeration Reasong: Liquid NH_3quickly vaporises.

Assertion : Linkage isomerism arises in coordination compounds containing ambidentate ligand. Reason : Ambidentate ligand has two different donor atoms.

Assertion: Limestone addes in the blast furance decomposes to give CaO which forms slag in molten state and separates out from ironReason : The iron obtained from the blast furnace contains about 4% carbon and many impurities like S,P,Si, Mn, etc.

Assertion: Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid. Reason: Lewis aciid polarises the bromine molecule.

Assertion: Lime water becomes trubid on passing CO_(2) but becomes clear on passing more CO_(2). Reason: Lime water is calcium hydroxide, Ca(OH)_(2).

Assertion: Li_(2)SO_(4) does not form double salt like alum Reason: Li reacts with NH_(3) gas to form LiNH_(2)

Assertion: Less substituted alkenes are formed in both Hoffmann and Cope elimination reactions. Reason: Hoffmann elimination and Cope elimination both are syn elimination reactions.

Assertion: Lead, tin and bismuth are purified by liquationmethod. Reason : Lead, tin and bismuth have low m.p. as compared to impurities.

Assertion : Levigation is used for the separation of oxide ores from impurities Reason : Ore particles are removeed by wahing in a current of water

Assertion: Li is most strong reducing agent among alkali metals Reason: hydration energy of Li^(+) is maximum among the alkali metals.

Assertion : Leaching is a process of reduction. Reason : Leaching involves treatment of the ore with a sutable reagent so as to make it soluble while impurites remains insoluble.

Assertion :La(OH)_(3) islessbasicthan Lu (OH)_(3) Reason : Basiccharacter ofhydroxidesoflanthanides increasesonmovingfrom La^(3+) to Lu^(3+)

Assertion. Langmuir adsorption is a single layer phenomenon. Reason. It is due to van der Walls forces.

Assertion : Lamda_(m) for weak electrolytes shows a sharp increase when the electrolytic solution is diluted. Reason: For weak electrolytes degree of dissociation increases with dilution of solution.

Assertion:Lambda_(m) for weak electrolytes shows a sharp increase when the electrolytic solution is diluted. Reason:For weak electrolytes degree of dissociation increases with dilution of solution.

Assertion : K,Rb and Cs form superoxides. Reason : The stability of the superoxide increases from 'K' to Cs due to decrease in lattice energy