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.

Assiertion : Acetone-aniline mixture shows nagative deviation from Raoult's law. Reason : H-bonding acetone and anilne is stronger than that between acetone-acetone and anilne-anilne.

Answer»

If both ASSERTION are REASON are CORRECT and reason is correct EXPLANATION for assertion.
If both assertion and reason are CORRCT but reason is not correct explanation for assertion.
If assertion is corrct but reason is incorrect.
If assertion and reason both are incrrect.

Solution :Reason is the correct explanation for assertion.
Discussion
2.

Assettio (A) : Ph overset (o+) (N_2) Br^(Θ) on reaction with NaOH gives bebzene diazohroxile Reason (R ) : overset (Θ) (OH) is a strong nucleophile , attacks the terminal (N) atom , and forms a covalent bond.

Answer»

If both (A) and (R ) ar true, and (R ) is the CORRECT explanation of (A).
If both (A) and (R ) are true , and (R ) is not the correct explanation of (A).
If (A) is true , but (R ) is FALSE .
If both (A) and (R ) are false .

SOLUTION :Both (A) and (R ) are true and (R ) is the correct explanation of (A). .
Discussion
3.

Assettion(A) : Ph overset (o+) (N_2) Br^(Θ) pm reactopm wotj motrpnemzeme om the [resemce pfNaOH gives p-nitrbiphenyl Reason(R ) : The reaction takes jplace by free radical mechanism .

Answer»

If both (A) and (R ) ar true, and (R ) is the CORRECT EXPLANATION of (A).
If both (A) and (R ) are true , and (R ) is not the correct explanation of (A).
If (A) is true , but (R ) is false .
If both (A) and (R ) are false .

Solution :It is an example of Gomberg reaction which takes PLACE by free radical mechanism .
Discussion
4.

Assertion : Coagulation power of Al^(3+)is more than Na^(+) . Reason : greater the valency of the flocculating ion added, greater is its power to cause precipitation

Answer»

if both assertion and reason are TRUE and reason is the CORRECT EXPLANATION of assertion. (Hardy-Sechulze rule)
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 :A
Discussion
5.

Assetion : According to Werner, The outer sphere of the complex is called the ionisation sphere . Reason : The groups present in ionisation sphere are loosely bound to the central metal ion and do not ionize in solution.

Answer»

Both assertion and reason are TRUE and the reason is the correct explanation of the ASSETION
Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
Assertion is true but reason is FALSE
Both assertion and reason are false.

Answer :C
Discussion
6.

Assertion:When dry air is passed continuously through an aqueous solution of non-volatile solute, vapour pressure of solution decreases gradually. Reason:Some air absorbed in the solution.

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 :B
Discussion
7.

Asserton : Ethyl xantyhate is used as a collector in froth floatation process. Reason : Collectors depress the loatation property of one of the componenets of the ore and thus help in the separation of different minerals present in the same ore.

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 :Assertionis true but reason is false. Collectors absorbs themselves on polar groups to grains of ores and thus DERIVE then on the surface to passs on into the fourth
Discussion
8.

Assertion:When methanol is added to water boiling point of water decreases. Reason:Methanol when added to water gives a non ideal solution with negative deviation.

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 :C
Discussion
9.

Assertion:When CuSO_4 is dissolved in water, the solution is warmed up. Reason:Hydration energy of CuSO_4is higher than its lattice energy

Answer»

Both Assertion and REASON are true and Reason is the CORRECT explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is FALSE
Both Assertion and Reason are false

Answer :A
Discussion
10.

Assertion:When a solution of non-volatile solute in water is cooled slightly below its freezing temperature, some ice separates out and then freezing stops. Reason: Separation of ice increases the molality of the left over solution.

Answer»

Both ASSERTION and REASON are true and Reason is the correct EXPLANATION of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

Answer :A
Discussion
11.

Assertion:The sum of mole fractions of all components of a solution is unity. Reason:Mole fraction is independent of temperature.

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 :B
Discussion
12.

Assertion:Van't Hoff factor for electrolytes is always greater than unity. Reason: Electrolytes undergo dissociation in polar solvents like water.

Answer»

Both ASSERTION and Reason are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is FALSE
Both Assertion and Reason are false

ANSWER :A
Discussion
13.

Assertion:The presence of Ag^+ enhances the solubility of alkenes in water. Reason:Alkenes are weakly polar in nature

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 :`Ag^+` COORDINATES with the alkene by `ppi-dpi` bonding giving an ION and the solubility INCREASES.
Discussion
14.

Assertion:Vapour pressure of water is less than 373K at 1.013 bar. Reason: Water boils at 273K as the vapour pressure at this temperature becomes equal to atmospheric pressure

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
15.

Assertion:The molecular mass of acetic acid in benzene is more than the actual value of the solute. Reason: Molecules of acetic acid dimerise in benzene due to hydrogen bonding.

Answer»

Both ASSERTION and Reason are true and Reason is the CORRECT explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

ANSWER :A
Discussion
16.

Assertion:Styrene on reaction with HBr gives 2-bromo-2-phenyl-ethane. Reason:Benzyl radical is more stable than alkyl radical

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 assertion and reason both are false

Solution :HBR adds to the double bond of the STYRENE forming 1-bromo-1-phenylethane.

This is an EXAMPLE of elimination-addition reaction
Discussion
17.

Assertion:Solutions of identical concentrations always have same osmatic pressure Reason:Number of particles present in solutions is same if molar concentrations is same

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
18.

Assertion : Propene reacts with HBr in presence of benzoyl peroxide to yield 1- bromopropane. Reason : In presence of peroxide , the addition of HBr to propane follows ionic mechanism.

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 :Propene reacts with HBr in presence of benzoyl peroxide to give 1-bromopropane. In presence of peroxide , the ADDITION of HBr to propane occurs by FREE radical mechanism.
Discussion
19.

Assertion:Osmosis does not take place in two isotonic solutions separated by semipermeable membrane. Reason : Isotonic solutions have same osmotic pressure

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
20.

Assertion:Reverse osmosis is used in the desalination of sea water. Reason: When pressure more than osmotic pressure is applied, pure water is squeezed out of the sea water through the membrane.

Answer»

Both Assertion and REASON are true and Reason is the correct explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is FALSE
Both Assertion and Reason are false

ANSWER :A
Discussion
21.

Assertion:Nuclear binding energy per nucleon is in the order -""_(4)^9Be gt ""_(3)^(7)Li gt ""_(2)^(4)He. Reason:Binding energy per nucleon increases linearly with difference in number of neutrons and protons.

Answer»

If both assertion and REASON are TRUE and reason is the explaination of assertion.
If both assertion and reason are true but reason is not the correct explaination of assertion
If assertion is true but reason is false
If both assertion and reason are false.

Solution :Binding energy per nucleon of`""_(3)Li^(7)` (5.38 MeV) is lesser than `""_(2)He^(4)`(7.08 MeV)` as helium is found to be more stable than Li.As the atomic mass number increases,the bionding energy per nucleon decreases.As increases,the binding energy per nucleon decreases.As the atomic number and the atomic mass number increase,the repulsive electrostatic forces WITHIN the nucleus increase due to the freater number of protons in the heavy elements.To overcome this increased repulsion,the proportion of neutrons in the nucleus must increase to maintain stability.This increase in the neutron-to-proton ration only partially compensates for the growing proton-protom repulsive force in the heavier,naturally occurring elements.Because the repulsive forces are increasing,less energy must be supplied,on the average,to remove a nucleon from the nucleus.The BE/A has decreased.The BE/A of a nucleous is an indication of its degree of stability.Generally,the more stable nuclides have higher BE/A than the less stable ones.The increase in BE/A as the atomic mass n umber decreases from 260 to 60 is the PRIMARY reason for the energy liberation in the fission process.The increase in the BE/A as the atomic mass number increases from 1 to 60 is the reason for the energy liberation in the fusion process,Which is the opposite reaction of fission.
Discussion
22.

Assertion:Neopentane forms only one monosubstituted compound. Reason:Neopentane has high bond 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 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 :NEOPENTANE has four identical methyl groups ATTACHED on `4^@` carbon atom and THUS only one product is possible during monosubstitution
Discussion
23.

Assertion:Nitration of toluene is easier than benzene. Reason:The methyl group in toluene is electron releasing.

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 assertion and reason both are false

Solution :In toluene, the group is electron Pushing . It is an activating group. By its+ I effect, `-CH_3` group activates the benzene ring at ortho and para position relative to its. Due to increased ACTIVITY towards electrophilic substitution toluene can be more easily NITRATED than benzene.
Discussion
24.

Assertion:NaCl in water and organic acids in benzene show abnormal molecular mass. Reason :Abnormal molecular mass is obtained when the substance in the solution undergoes either dissociation or association.

Answer»

Both ASSERTION and REASON are TRUE and Reason is the correct explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

Answer :A
Discussion
25.

Assertion:Melting point of n-butane is higher than propane. Reason: it is called oscillation effect

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 :ALKANES with odd carbon atoms have their and carbon atom on the same side of the molecule and in EVEN carbon atom alkane, the end carbon atom on opposite side. Thus alkanes with even carbon atoms are packed closely in crystal lattice to permit GREATER INTERMOLECULAR ATTRACTIONS and hence melting point
Discussion
26.

Assertion:Knocking lowers the efficiency of the engine Reason:Fuel with minimum knocking property is preferred

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 :Knocking involves the production of metallic SOUND due to irregular burning of the fuel . This irregular burning lowers the efficiency of the ENGINE
Discussion
27.

Assertion:isotonic solution do not show the phenomenon of osmosis. Reason: Isotonic solution have equal osmotic pressure

Answer»

If both assertion and reason are TRUE and the reason is the correct EXPLANATION of the assertion
If both the assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true but reason is false
If assertion is false but reason is true.

Solution :It is true that ISOTONIC solution doesn't SHOW the phenomenon of osmosis.Isotonic solution are those solution which have same osomotic pressure.Here both assertion and reason are true but reason is not correct explanation.
Discussion
28.

Assertion:Isobutane on oxidation with KMnO_4gives tert-butyl alcohol. Reason:Oxidising agents have no effect on alkanes

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 :Normally oxidising AGENTS have no effect on alkanes. However, alkanes containing a tertiary HYDROGEN atom can be oxidised by oxidising agents such as `KMnO_4` to the corresponding alcohols. For example, `underset"ISOBUTANE"(CH_3-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-H+[O])undersetDeltaoverset("Alkaline " KMnO_4)to underset"tert-butyl alcohol"(CH_3-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-OH)`
Discussion
29.

Assertion:In a complex prefixes cis- and trans - are used to designate adjacent and opposite geometric location of the ligands Reason:With in the coordination sphere ligands are named after the metal atom (or) ion

Answer»

Both ASSERTION & Reason are true ,Reason is the CORRECT explanation of Assertion
Both Assertion & Reason are true, Reason is not correct explanation of Assertion
Assertion is true , Reason is FALSE
Assertion is false , Reason is false

Answer :C
Discussion
30.

Assertion:If red blood cells were removed from the body and placed in pure water,pressure inside the cells increases. Reason:The concentration of salt content in the cell increases.

Answer»

If both assertion and REASON are true and the reason is the correct explanation of the assertion
If both the assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true but reason is false
If assertion is false but reason is true.

Solution :The concentration DECREASES DUE to INWARD flow of water from outside as a result of osmosis.
Discussion
31.

Assertion:If more and more solute is added to a solvent, the freezing point of the solution keeps on becoming higher and higher Reason :Presence of large amount of the solid solute does not allow the solution to freeze

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
32.

Assertion:(i)Dimethyl sulphide is commonly used for the reduction of an ozonide of an alkene to get the carbonyl compound (ii)Addition of bromine to trans-2-butene yields meso-2,3-dibromo butane. Reason:(i)It reduces the ozonide giving water soluble dimethyl sulphoxide and excess of it evaporates (ii)Bromine addition to an alkene is an electrophilic addition

Answer»

Both assertion and reason are correct and reason is the correct EXPLANATION of the assertion
Both assertion and reason are correct but reason is notthe correct explanation of the assertion
Assertion is correct, but reason is incorrect
Assertion is incorrect, but reason is correct

Solution :(i)Assertion and reason with correct and reason is the correct EXPLAINATION of the assertion. (II)Assertion and reason with correct and reason is NOTCORRECT explaination of the assertion.(addition of `Br_2` to transbutene-2 is ionic while it is electrophilic addition in ALKENE)
Discussion
33.

Assertion:Ideal solutions follow Raoult's law. Reason: DeltaH and DeltaV of ideal solutions are zero

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 :B
Discussion
34.

Assertion:Freezing point of neopentane is more than n-pentane. Reason:Increase in vander Waals forces increases freezing point

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 :NEOPENTANE is more SYMMETRIC than n-pentane and it is expected and thus that of n-pentane and thus have high melting point.
Discussion
35.

Assertion:Halogenation of alkanes is catalysed by tetraethyl lead Reason:Halogenation proceeds through free radical mechanism

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 :HALOGENATION of alkanes is catalysed by radical initiators LIKE benzoyl peroxide
Discussion
36.

Assertion:Ether has higher vapour pressure than water at a given temperature. Reason:Water has stronger inter molecular forces than ether.

Answer»

Both Assertion and Reason are TRUE and Reason is the correct EXPLANATION of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is FALSE
Both Assertion and Reason are false

ANSWER :A
Discussion
37.

Assertion:Ethylene glycol is added to water and used as antifreeze in the radiators of auto-mobiles. Reason: Addition of ethylene glycol lowers the freezing point of water.

Answer»

Both ASSERTION and Reason are TRUE and Reason is the correct explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

Answer :A
Discussion
38.

Assertion:Ethene on treating with Br_2 in presence of NaCl forms CH_2CICH_2Br and CH_2Br-CH_2-Br Reason:This addition involves the formation of free radicals

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 :The ADDITION of `Br_2` follows IONIC MECHANISM
Discussion
39.

Assertion:EDTA is used remove lead poisoning. Reason: EDTA is a chelatinf ligand.

Answer»

Both ASSERTION and reason are TRUE and the reason is the correct EXPLANATION of the ASSETION
Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
Assertion is true but reason is false
Both assertion and reason are false.

Answer :A
Discussion
40.

Assertion:During the formation of solution entropy of system increases Reason : Disorderliness decreases upon dissolution of solute to form a solution

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 :C
Discussion
41.

Assertion:Cyclolpentadienyl anion is much more stable than allyl cation Reason:Cyclopentadienyl anion is aromatic in character

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

Answer :A
Discussion
42.

Assertion:Cyclobutane is less stable than cyclopentane. Reason : Presence of bent bonds causes "loss of orbital overlap"

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

Answer :C
Discussion
43.

Assertion.Copper (II)iodide is not known. Reason. Cu^(2+)oxidizes I^(-) to iodine.

Answer»

SOLUTION :R is the CORRECT EXPLANATION of A.
Discussion
44.

Assertion:Camphor is used as solvent in the experi mental determination of molecular mass of naphthalene and anthracene Reason: Camphor has high cryoscopic constant

Answer»

Both Assertion and REASON are true and Reason is the CORRECT explanation of Assertion
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Assertion is true but Reason is false
Both Assertion and Reason are false

ANSWER :A
Discussion
45.

Assertion:Born-Haber cycle is based on Hess's law. Reason: Lattice enthalpy can be calculated by Born-Haber cycle

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 :Hess's law states that the enthalpy of a reaction is the same, whether it TAKES place in a single step or in more than one step. In born haber cycle the formation of an combination of the element or by a STEPWISE process involving VAPORIZATION of elements, conversions process gaseous atoms into ions & the combination of the gaseous ions to form the ionic solid .
Discussion
46.

Assertion:Benzene is a solvent for the Friedel Craft's alkylation of bromobenzene. Reason : Friedel Craft's reation is used to introduce an alkyl or acyl group in benzene nucleus

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 assertion and reason both are false

Solution :During alkylation of bromobenzene , if benzene is used as SOLVENT, alkylation of benzene will take place because benzene is more reactive for `S_E` reactions than bromo benzene, benzene is not used as a solvent for this reaction
Discussion
47.

Assertion(A):Treatment of1,3-dibromopropane with zinc produces cyclopane. Reason: The reaction of alkyl halides with zinc metal is termed as CoreyHouse reaction.

Answer»


ANSWER :C
Discussion
48.

Assertion(A):The octane number compare gasoline's tendency to knock against the tendency of a blend of two standard hydrocarbon, heptane and isooctane. Reason: The gasoline that matches a blend of 87%, 2,2,4-dimethylpentane and 13% heptane is given an octane number13.

Answer»


ANSWER :C
Discussion
49.

Assertion.Atomic size of silver is almost the same as that of gold. Reason. d-subshell has low penetration power and produces poor shielding.

Answer»

Solution :CORRECT explanation . ATOMIC size of silver is almost EQUAL to that of gold DUE to lanthanoidcontraction.
Discussion
50.

Assertion(A):The boiling point of n-alkanes regularly with the increase in the number of carbon atoms. Reason: The magnitude of van der Waal's forces increases with increase in molecular mass and molecular size.

Answer»


ANSWER :A
Discussion