Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Assertion (A) : All chemicals added to food items are called food preservatives. Reason (R) : All these chemicals increase the nutritive value of the food.

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 :Both assertion and reason are wrong statement.
Discussion
2.

Assertion (A) : Alkyl isocyanides in acidified water give alkyl formamides Reason (R) : In isocyanides, carbon first acts as a nucleophile and then as an electrophile.

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 false.

Answer :C
Discussion
3.

Assertion (A) : Alkyl cyanides as well as alkyl isocyanides have much higher boiling points than corresponding alkyl halides. Reason (R) : Cyanides and isocyanides are much more polar than alkyl halides.

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 false.

Answer :A
Discussion
4.

Assertion (A) : Aldehydes which do not have an alpha-hydrogen atom undergo self-oxidation and reduction on treatment with conc. KOH. Reason (R ) : Primary alcohols on oxidation with alkaline KMnO_(4) give aldehydes.

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, and 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 :C
Discussion
5.

Assertion (A): Alkyl halides are prepared by electrophilic halogenation of alkanes. Reason (R) : DDT is a safe insecticide.

Answer»

Both Assertion (A) and Resort (R) are correct statements, QUID Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are correct statements, brit 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 RENSON (R) is correct statement.

Answer :d
Discussion
6.

Assertion (A) : Alcohols have higher boiling points than hydrocarbons, ethers and haloakanes of comparable molecular masses. Reason (R) : Alcohol molecules from intermolecular bonding amongst one another.

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 explanationof the Assertion (A).
Assertion (A) is correct, but Reason (R) is INCORRECT statement.
Assertion (A) is incorrect, but Reason (R) is correct statement.

Answer :A
Discussion
7.

Assertion (A) : Aldehydes are converted into aldols in the presence of concentrated alkali. Reason (R) : Tollen's reagent can distinguish between aldehydes and ketones but Fehling reagent cannot.

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 :D
Discussion
8.

Assertion (A): Alcohols have higher boiling points than ethers of comparable molecular mass. Reason (R): Alcohols and ethers are functional isomes.

Answer»

(A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) does not EXPLAIN (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

ANSWER :B
Discussion
9.

Assertion (A) : Albumin is a globular protein. Reason (R ) : Polypeoplide chain coils around to give straight chain

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
10.

Assertion (A) : Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol. Reason: Addition of water in acidic medium proceeds through the formation of primary carbocation.

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 :The but-1-ene with water forms butan-2-ol by Markonikov.s rule and the reaction proceeds through the formation of SECONDARY CARBOCATION.
Discussion
11.

Assertion (A) : Air becomes dry in presence of silica gel. Reason (R) : Water molecules are absorbed on the surface of gel.

Answer»

Assertion (A) and REASON (R) both are TRUE. (R) is the PROPER explanation of (A). 
Assertion (A) and Reason (R) both are true but (R) does not explains (A). 
Assertion (A) and Reason (R) both are FALSE.
Assertion (A) is not true but Reason (R) is true. 

SOLUTION :Assertion (A) is true and Reason (R) is false.
Discussion
12.

Assertion (A) : AgI//I^(-) is a negatively charged sol. Reason (R) : When a dilute solution of AgNO_3 is added to a dilute solution of KI, the precipitated Agl absorbs I^(-) ions from dispersion medium.

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 :A
Discussion
13.

Assertion (A) : Adsorption is a spontaneous process. Reason (R) : Adsorption is always accompanied by decrease in free energy. When molecules are adsorbed, there is always a decrease in randomness of the molecules.

Answer»

Both A and R are CORRECT and R is the correct EXPLANATION of A.
Both A and R are correct but R is not correct explanation of A.
Both A and R are WRONG.
A is correct but R is wrong.

Answer :A
Discussion
14.

Assertion (A) : Acidified K,_(2)CrO_(7) oxidises iodides to iodine. Reason (R) : Sodium dichromate is more soluble than potassium dichromate.

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
15.

Assertion (A): Actinoids form relatively less stable complexes as compared to lanthanoids. Reason (R ): Actinoids can utilize their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

Answer»

Both ASSERTION and reason are true and reason is the correct explanation of the assertion
Both assertion and reason are true, but reason is not correct explanation of the assertion
Assertion is not true reason is true
Both assertion and reason are false

Solution :Actinoids SHOW greater range of OXIDATION STATES
Discussion
16.

Assertion (A): Acid hydrolysis of ethylacetate by water to produce acetic acid and ethanol is an example of auto catalysis. Reason (R) : In acid hydrolysis of ester, the product acetic acid act as catalyst and this process is called autocatalysis.

Answer»

Both A and R are CORRECT and R is the correct EXPLANATION of A.
Both A and R are WRONG.
A is correct but R is wrong.
A is wrong but R is correct.

ANSWER :A
Discussion
17.

Assertion (A) : AC current is used in wheatstone bridge arrangement to measure conductivity of ionic solution. Reason (R) : If DC current is used in wheatstone bridge arrangement, it will lead to electrolysis of the solution taken in the cell. So AC current is used to prevent electrolysis.

Answer»

Both A and R are CORRECT and R is the correct EXPLANATION of A
Both A and R are WRONG
A is correct but R is wrong
A is wrong but R is correct

ANSWER :A
Discussion
18.

Assertion (A) : Absorption is a bulk phenomenon. Reason (R): The absorbed molecules are distributed throughout the absorbent.

Answer»

Both A and R are CORRECT and R is the correct EXPLANATION of A.
A is correct but R is WRONG.
A is wrong but R is correct.
Both A and R are wrong.

Answer :A
Discussion
19.

Assertion (A) : A variety of steel and stainless steel can be prepared by using Cr, V, W, Mo and Mn. Reason (R) : As the oxidation number of a metal increases, ionic character decreases.

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, LUUT Reason (R) is incorrect STATEMENT.
Assertion (A) is incorrect, but Reason (R) is correct statement

Answer :B
Discussion
20.

Assertion (A): A racemic mixture is represented by fixing dl or (pm) before the name. Reason (R) : Aryl halides are extremely reactive towards nucleophilic substitutions.

Answer»

Both ASSERTION (A) and Resort (R) are correct statements, QUID REASON (R) is the correct EXPLANATION of the Assertion (A).
Both Assertion (A) and Reason (R) are correct statements, brit 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 Renson (R) is correct statement.

Answer :c
Discussion
21.

Assertion (A): A low grade sulphide ore is concentrated using pine oil and frothing agent. Reason (R) : A number of drugs are used to kill germs by getting adsorbed on them.

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
22.

Assertion (A): A mixture containing two enantiomers in equal proportions is called a racemic mixture. Reason (R) : Compounds of the type RMgX were discovered by Sandmeyer.

Answer»

Both Assertion (A) and RESORT (R) are CORRECT statements, quid Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are correct statements, brit 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 Renson (R) is correct statement.

Answer :C
Discussion
23.

Assertion (A): A half-cell can also be called redox couple. Reason (R) : According to IUPAC, standard reduction potentials are now called standard electrode potentials.

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
24.

Assertion (A): A given surface of an adsorbent does not show any preference for a particular gas as van der Waal's forces are universal. Reason (R) : The air becomes dry in the presence of silica gel because the water molecules get adsorbed on the surface of the gel.

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
25.

Assertion (A) : 5Br_((aq))^(-)+BrO_(3_((aq)))^(-)+6H^(+) rarr3BR_(2(l))+3H_(2)O_((l))The overall order of the reaction is equal to 4 . Reason (R) : The experimental rate law is , Rate = K[Br^(-)][BRO_3^(-)][H^(+)]^2. So 1 + +1 + 2 = 4 order value is 4.

Answer»

Both A and R are CORRECT and R is the correct EXPLANATION of A
Both A and R are correct but R is not the correct explanation of A
A is correct but R is WRONG
A is wrong but R is correct

ANSWER :a
Discussion
26.

Assertion (A) : 2 - nitro propane is more acidic than nitro methane. Reason (R) : when the number of alkyl group attached to a carbon increases, acidity decreases. due to +1 effect of alkyl groups.

Answer»

Both A and R are CORRECT but R is not the correct EXPLANATION of of A
Both A and R are correct and R is the correct explanation of A
A is correct but R is WRONG
A is wrong but R is wrong

ANSWER :D
Discussion
27.

Assertion (A): 2- Bromobutane on reactionwith sodiumethoxid eihoxide in ethanol gives 1- butene as a majorproduct. Reason (R):i- Butene is more stable than 2- butene.

Answer»

Both `(A)` and `(R)` are true and `(R0` is the correct explanation of `(A)`.
Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`.
`(A) is true but `(R)` is false.
Both `(A)` and `(R)` are false.

Solution :Correct reason:
It GIVES but `-2-ene` gtbrgt Corrrect reason:
But `-2-ene` is more stable than but `1-ene`
Discussion
28.

Assertion (A)-2^(@) amines are more basic. Reason(R): Due to +I effect, steric effect and hydration effect cause 2^(@) amines are more basic.

Answer»

Both A and R are CORRECT and r is EXPLAINS A
Both A and R but R is wrong
A is correct but R is wrong
A is wrong but R is correct

Answer :A
Discussion
29.

Assertion (A) : 2, 3, 4-Trichloropentane can exhibit optical isomerism. Reason (R ) : 2, 3, 4- Trichloropentane has three chiral C atom in its molecule.

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 true
A is false but R is true

ANSWER :C
Discussion
30.

Assertion (A) : 0.1 M urea solution is iso-osmotic with 0.1 M NaCl solution.Reason (R ) : Urea and NaCl had same concentration.

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.
Both assertion and reason are FALSE.

ANSWER :D
Discussion
31.

Assertion (A ) : The degree of ionization of water is small at 25^(@)C , only aboutone of every 10^(7) molecules in pure water is ionized at any instant Reason (R ) : In pure water at 25^(@)Cthe molar concentration of water is essentially constant.

Answer»

Both A and R 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 :B
Discussion
32.

Assertion (A ) : Aryl halides undergo nucleophilic sunstitution reaction with ease. The carbon halogen bond in aryl halides has partial double bonds character.

Answer»

Both ASSERTION (a) And Reason (R )are correct Statement . And Reason (R )is the correct EXPLANATION of the Assertion (A)
Both Assertion (A) and Reason (R ) are correct statement , bbut Reason (R ) is not the correct expanation of the Assertion (A)
Assertion (A) is correct , but Reason (R ) is correct statement .
Assertion (A ) is incorrect but Reason (R ) Is correct statement.

Answer :D
Discussion
33.

Assertion :4.58 mm and 0.0098^(@)C is known to be triple point of water. Reason : At this pressure and temperature all the three states i.e., water , ice and vapour exist simulataneously.

Answer»

If both ASSERTION and REASON are TRUE and the reason is 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 :N/a
Discussion
34.

Assertion : 3dtransitionmetal ions inparamagneticsolidsoftenhavea magneticdiplemomentscorrespondingto theh electricspincontribution . Reason: The magneticmomentof theionis mu = g sqrt(s(S+1) mu_(beta))

Answer»

bothassertionand reasonare truereasonis thecorrectexplanationof THEASSERTION .
bothassertinandreasonare truebutreasonis notcorrectexplanationof theassertion
Assertionis truebutreasonis FALSE
Bothassertionand reasonare false.

Answer :A
Discussion
35.

Assertion : 2^(nd) period elements do not involve in excitation of electron. Reason : 2^(nd) period elements do not have vacant 2d-orbitals.

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 :B
Discussion
36.

Assertion: 2,2-Dimethylpropanal gives Cannizzaro reaction with concentrated NaOH. Reason: Cannizzaro is a disproportionation reaction.

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.

Solution :Correct explanation,: 2,2-Dimethylpropanal does not contain `alpha-H` and HENCE in PRESENCE of CONC. Alkali, it undergoes CANNIZZARO reaction.
Discussion
37.

Assertion : 2,2-dimethyl propanoic acid does not give HVZ reaction Reason : 2,2- dimethyl propanoic acid does not have -alpha hydrogen atom

Answer»

If both assertion and REASON are TRUE and reason in the CORRECT explanation assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
Assertion is true but reason is FALSE
Both assertion andreason are false

Solution :
Discussion
38.

Assertion : 22.4 L of N_(2) at NTP and 5.6 L O_(2) at NTP contain equal number of molecules. Reason : Under similar conditions of temperature and pressure all gases contain equal number of molecules.

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 :MOLAR volume (at NTP) `=22.4 L`
Now 22.4 L of `N_(2)=` volume OCCUPIED by one mole of `N_(2)=28` gm `=6.023xx10^(23)` molecules.
Similarly, `O_(2)=2xx16=32 gm`,
`32 gm=6.023xx10^(23)` molecules `=22.4 L`
`:. 22.4 L =6.023xx10^(23) or 5.6 L =(6.023xx10^(23)xx5.6)/22.4`
`=1/4xx6.023xx10^(23)`
Discussion
39.

Assertion: 2-methyl-1,3-butadiene is the monomer of natural rubber Reason: Natural rubber is formed through anionic addition polymerisation.

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
assertion is true but reason is false
both assertion and reason are false

SOLUTION :assertion is true but reason is false
Discussion
40.

Assertion : 2-methyl-1,3-butadiene is the monomer of natural rubber Reason : Natural rubber is formed through anionic addition polymerisation.

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.
assertion is true but reason is false
both assertion and reason are false.

Answer :C
Discussion
41.

Assertion : 2-Methyl-1, 3-butadiene is the monomer of natural rubber. Reason : Natural rubber is formed through anionic addition polymerization.

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 :C
Discussion
42.

Assertion: 2-Butenal lacks enolisable H-atom, alpha-to carbonyl group, still it has sufficient acidic character. Reason: The conjugate base of 2-butenal is stabilised by resonance.

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.

Solution :Reason is the CORRECT explanation of the assertion.

Discussion
43.

Assertion : 2-Butanol on heating with H_2SO_4 gives 1-butenol on heating with H_2SO_4gives 1 - butaenol follows Sytzeff's rule.

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 :Saytzaff's rule: The alkene formed ingreatest amount is the one that corresponds to REMOVAL of the hydrogen from the `beta ` carbon havind the fewest hydrogen substituent.
In CASE of ` 2^@` and `3^@`alc. Saytzeff's rule is followend
`H_3C-CH_2underset(OH)underset(|)CH-CH_3underset((1:1))OVERSET(H_2O_4)rarrH_3"CC"H=CH-CH_3+H_2O`
Discussion
44.

Assertion: 2-Butanal lacks enolisable H-atom , alpha- to carbonyl group still it has cufficient acidic charater. Reason : The conjugate base of 2-butanal is stablised by resonance.

Answer»

If Both assertion and REASON are TRUE reason is the correct EXPLATION of the assertion.
If Both assertion and reason are true but reason is not the correct explation of the assertion.
If assertion is true but reason is false.
If assertion is false but reason is true.

Solution :Reason is the correct explation of the assertion.
`[H-CH_(2)-CH_(2)-underset(2-"BUTENAL"))CH=CH-Ch=overset(OH^(-))underset(-H_(2)O)to`
Discussion
45.

Assertion : 2-Bromobutane on reaction with sodium ethoxide in ethanol gives 2-butene as a major product. Reason : 2- Butene is more stable than 1-butene.

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 butreason 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 :2-bromobutane on reaction with sodium ETHOXIDE in ethanol gives 2-butene as a major product

`ETOH +CH_3 -CH=CH-CH_3+Br^-`
This is according to saytzeff's rule i.e., the predominant product is the most substituted alkene, i.e. are carrying the largest number of alkyl substituents of hydrogen is eliminated PREFERENTIALLY from the carbon atom joined to the LEAST number of hydrogen atoms.
2-butene is more stable than 1-butene due to presence of large number of hyperconjugating STRUCTURES in 2-butene.
Discussion
46.

Assertion: 2-Bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as a major product. Reason: 1-butene is more stable than 2-butene.

Answer»

If both ASSERTIONN and reason are TRUE, and reason is the true explanation of the assertion.
If both assertion and reason are true, but reason is not the true explanation of the assertion.
If assertion is true, but reason is false.
If both assertion and Reason are false.

Solution :CORRECT assertion: 2-Bromobutane on reaction with SODIUM ethoxide in ethanol GIVES 2-butene as the major.
Correct reason: 2-Butene is more stable than 1-butene.
Discussion
47.

Assertion: 2 ,2- dimethyl propanoicacid does not give HVZ reaction . Reason: 2 -2 ,dimethylpropanoicacid doesnot have- -hydrogen atom

Answer»

if bothassertion and reasonare TRUEAND reasonis the CORRECTEXPLANATION of ASSERTION .
if bothassertionand reasonare truebutreasonis not the correctexplanationof assertion.
assertionis truebut reasonis false
bothassertionand REASON are false .

Answer :A
Discussion
48.

Assertion: ._(1)H^(1), ._(1)H^(2) and ._(1)H^(3) are isotopes of hydrogen. Reason : Nuclides of the same element of different mass numbers are called isotopes of that element

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 assertion is false but reason is true

Answer :A
Discussion
49.

Assertion. 1.575" g of "H_(2)C_(2)O_(4).2H_(2)O in 250 mL solution makes it 0.1 N. Reason. H_(2)C_(2)O_(4).2H_(2)O is a dihydrate organic acid.

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 :EQ. wt. of `H_(2)C_(2)O_(4).2H_(2)O=(126)/(2)=63`
`therefore"Noramality of the solution"`
`=(1.575)/(63)XX(1)/(250)xx1000=0.1N`
Hence, Assertion is true.
CORRECT explanation. `H_(2)C_(2)O_(4).2H_(2)O` s a dibasic acid.
Discussion
50.

Assertion: 1,3-Butadiene is the monomer for natural rubber. Reason : Natural rubber is formed through anionic addition polymerization.

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 assertion : Isoprene , i.e., 2 methyl-1,3-butadiene is the monomer of NATURAL rubber.
Correct reason : Natural rubber is formed through free RADICAL or cationic addition polymerisation.
Discussion