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.

Select the incorrect option of the following statements.

Answer»

BIMOLECULAR elimination of ALKYL halides is a stereospecific reaction.
In `S_N2` reaction a single ISOMER in the only product
ALCOHOL dehydrate in strongly basic conditions by E1 mechanism.
3-hydroxypropanal DEHYDRATES in strong basic condition byE1cb mechanism.

Answer :C
Discussion
2.

Select the incorrect option for van der Waal's gas.

Answer»

He has smaller 'a' (van der Waals' constant) than Ne,Kr,Ar,`CO_(2),CH_(4)` and `NH_(3)`
He HS smaller 'b' (van der Waals' constant)than Ne,Kr,Ar,`CO_(2),CH_(4)` and `NH_(3)`
At 273K and 1 atm, He moecules have attractions with respect to IDEAL behaviour
At 273 K and 1 atm He molecules have repulsions with respect to ideal behaviour

Answer :c
Discussion
3.

Select the incorrec option:

Answer»

Specific volume and molar heat capacity are intensive PROPERTIES:Change in internal energy for an ideal gas forand isobaric process is EXPECTED as `nC_(V)(T_(2)-T_(1)).`
Thermodyamics can predict rate at which process will take place.
Free EXPANSION is an irreversible process.

Answer :C
Discussion
4.

Select the false statements from the following and try to justify your assertion: (a) Like carbon, silicon also existas in the free state. (b) B(OH)_(3) is acidic in nature. (c) Boron dissovles in hydrochloric acid. (d) The composition of common glass is Na_(2)O,CaO.6SiO_(2). (e) Silica contains SiO_(2) molecules with O=Si=O bonds. (f) BF_(3) is a strnger Lewis acid than BCl_(3) (f) Water glass is sodium silicate. (h) diborane cannot have ethane like structure because it is not a covalent molecule.

Answer»

Solution :(a) SILICON does not exist in free state becaue it is more reactive than carbon due to bigger size andalso lesser ionisation enthalpy.
(C) Boron dissolves only in oxidising acids like `H_(2)SO_(4)` and `HNO_(3)` to form boric acid. As HCl is not strong oxidising agent, boron does not dissolve in HCl.
(e) In silica O=Si=O cannot be present due to the different in the energy state of 2p orbital of oxygen and 3porbial of silicon which are to participitate in sidewise overlapping.
(f) `BF_(3)` is a weaker Lewis acid than `BCl_(3)` because of greater magnitude of `p pi- p pi`back bonding, resulting in more ELECTRON density on the boron atom.
(h) dibronae cannot have a ethane like structure becasue boron atom is trivalent and more than three hydrogen ATOMS cannot be linked to it. thus `H_(3)B-BH_(3)` structure is not POSSIBLE in this case.
Discussion
5.

Select the corrrect statement with prespect to the deep blue solution of a n alkali metal in liquid ammonia.

Answer»

Its paramagnetism DECREASES with increasing concentration.
It has lower density than pure solvent (I,e.liquid ammonis).
Its conductivity decreases with increasing concentration oto MINIMUM at about 0.05 molar, THEREAFTER it again increase.
Evaporation of ammonia from the solution yields ALKALI metal.

Answer :A::B::C::D
Discussion
6.

Select the correct statements number for the following statements in sequence. (i) IUPAC naem of propyl cyanide is propane nitrile (ii) IUPAC name od diethylether is ethoxy ethane (iii) Ethanol and vinylalcohol are tautomers (iv) Methoxy propane and ethoxyethane are metamers (v) 2, 3-dimethyl-but-2-ene is more stable than 2-methyl-but-2-ene (vi) Stability order of carbocation is 1^(@) lt 2^(@) lt 3^(@) (vii) Hybridization of carbon atom does not change in elimination reaction. (viii) Nucleophilie is lewis acid

Answer»

2, 4, 6, 8
1, 3, 5, 7
2, 4, 6, 7
2, 4, 5, 6

Answer :D
Discussion
7.

Select the correct statement(s) from the following

Answer»

GRAPHIT is thermodynamically more UNSTABLE FORM of carbon
Graphite can be converted into diamond
Graphite is used as a moderator in nuclearreactors
Graphite is less reactive than diamond

Solution :(BC ) The heat of combustion of graphite-94.052 KCAL `//` MOLE and that of diamond is 94.505 kcal `//` mole. However, it can be converted into diamond at `16000^(@)C`by a pressure of 5,000 to 60,000 atm
Discussion
8.

Select the correct statements for hydrogen like atoms or ions.

Answer»

RADIUS of an ORBIT is INVERSELY proportional to Z
Radius of an orbit is inversely proportional to `Z^(2)`
Energy of the ELECTRON in an orbit is inversely proportional Z
Energy of the electron in an orbit is directly proportional `Z^(2)`

ANSWER :C::D
Discussion
9.

Select the correct statement(s) among the following (i) Total number of orbitals in a shell with principal quantum number 'n' is n^(2) (ii). Total number of subshells in the n th energy level is n (iii). The maximum number of electrons in a subshell is given by the expression (4l+2)

Answer»

m=l+2 where la nd ma re azimuthal and magnetic QUANTUM numbers.
(i),(iii) and (iv) are CORRECT
(i),(ii) and (iii) are correct
(ii),(iii) and (iv) are correct

Answer :B
Discussion
10.

select the correct statements among the following :

Answer»

MILK is emulsion of fat in water.
an emulsifier stabilizes the emulsion
emulsifier forms a thin film around the droplets of dispersed PHASE.
milk is an emulsion of PROTEIN in water.

Answer :A,B,C
Discussion
11.

Select the correct statements about the wave function Psi.

Answer»

`Psi` must be REAL
`Psi`must be single VALUES, continuous
`Psi` has no physical SIGNIFICANCE
`Psi`gives the probability of finding the electrons

Solution :`Psi` gives AMPLITUDE of electron wave . `Psi` has eigen values . `Psi^2` gives probability of electron
Discussion
12.

Select the correct statements about the following : NO[BF_(4)]

Answer»

It has `5sigma` and `2pi` BONDS
It has diamagnetic character
B-F bond length in this compound is SHORTER than that in `BF_(3 )`
N-0 bond length in this compound is greater than that of NO

ANSWER :A::B
Discussion
13.

Select the correct statement(s) about chemical reaction in a closed container.

Answer»

TOTAL MASS REMAINS conserved.
Total MOLES of molecules remains conserved.
Total mass of atoms remains conserved
Total mass of molecules may change.

Answer :A::C::D
Discussion
14.

Select the correct statements about diborane

Answer»

`B_2H_6` has three centre TWO electron bond
Each boron atom lies in `sp^3` HYBRID state
`H_(t)......B......H_(t)` bond ANGLE is `122^@`
All hydrogens is `B_2H_6` lie in the same plane

Solution :
`B_(2)H_(6)`has three centre two electron bond, each boron UNDERGOES `sp^3`hybridisation only 4 hydrogens and 2 borons are present in the same plane
Discussion
15.

Select the correct statement(s),

Answer»

An electron near the nucleus is attracted by the nucleus and has a low potential ENERGY
According to Bohr.s theory, an electron continuously radiate energy if it stayed in out orbit
Bohr.s MODEL COULD not explain the spectra of multielectron atoms
Bohr.s model was the first atomic model BASED on quantisation of energy

SOLUTION :Bohr.s atomic model is first atomic model based on quantisation of energy and it is not applicable for multi electron systems.
Discussion
16.

Select the correct statements

Answer»

<P>At high pressure REAL gases are less COMPRESSIBLE in comparison to ideal GAS
`H_2` and He are more compressible than ideal gases at all pressures
Except `H_2` and `He`, the compressibility factor is less than unity for all gases at low pressure
The compressibility factor of real gases is independent of temperature

Solution :a) At high P, Z > 1 = less compressible
b) `H_2`, He have Z > 1
c) At low, `P ,Z < 1`= mole compressible
d) Z depends on T.
Discussion
17.

Select the correct statement(s):

Answer»

ALKALINE solution of POTASSIUM tetraiodomercurate (II) gives brown ppt. with ammonium chloride solution.
On warming MIXTURE of `NH_(4)CI` and `NaOH` solution, evolved gas form deep blue complex with `CuSO_(4)(aq)`.
On warming mixture of `NH_(4)CI` and `NaOH` solution, evolved gas turns `Hg_(2)(NO_(3))_(2)` solution black.
`NH_(4)^(+) +NaOH overset(Delta)RARR` Only has 'X' evolved gas 'X' turns moistened blue litmus paper red.

Answer :A::B::C
Discussion
18.

Select the correct statements:

Answer»

Compound (A) is BASIC copper carbonate
Compound `(B) CUO`
Compound (C) is `Cu_(2)O`
Compound (D) is paramagnetic in nature

Answer :A::B::C::D
Discussion
19.

Select the correct statements:

Answer»

Eclipsed and STAGGERED ethanes given differet produces on reaction with chlorine in presence of light.
The ocnformational isomers can be isolated at room temperature
Torsional strain in ethane is minimum at dihedral angel `60^(@), 180^(@) and 300^(@)`
STERIC strain in minumum in staggered GAUCHE FORM of n-butane

Answer :C
Discussion
20.

Select the correct statement(S)

Answer»

Chlorophyllconyains magneium
In chorlphyll , magnessioum is complexed with PYRROLE ring of porphyring
`MgBr_(2) and mgI_(2)` are soluble in acetone
All the above AREA correct

Answer :4
Discussion
21.

Select the correctstatements.

Answer»

In a mixture of `KHC_(2)O_(4) " and "H_(2)C_(2)O_(4), KMnO_(4)` decolourises FASTER at higher temperature than lower temperature.
A catalyst participates in a chemical reaction by forming temporary bonds with the REACTANT resulting in an intermediate complex.
In collision theory, only activation energy determine the criteria for effective collision.
Collision theory assumes molecules TOBE soft spheres and consider their STRUCTURAL aspects.

Answer :a,b
Discussion
22.

Select the correct statement(s) :

Answer»

Clay and lime on STRONG HEATING produces a fused mass KNOWN as 'cement clinkers'
Melting point and boiling point of II A group elements are higher than that of corresponding I A group elements
Zeolite method is used to remove permanent hardness of water
`'Ba'` is soluble in both water and LIQUID `NH_(3)`

Solution :N//A
Discussion
23.

Select the correct statements :

Answer»

Stability of peroxides and SUPEROXIDES of alkali metals increase with increase in size of the cation .
Increase in stability in (A) is due to STABILISATION of large anions by larger cations through lattice energy effects .
The low solubility of LiF is due to its high lattice energy WHEREAS low solubility of CSI is due to smalller hydration energy .
NaOH does not form a hydrate .

Answer :A::B::C
Discussion
24.

Select the correct statementns (s)

Answer»

SUPER oxide ion contains a three electron bond
Super oxide react with dilute acid (e.g., del `H_(2)SO_(4))`
The PEROXIDES ar colourless and diamanetic where as super oxides are PARAMAGNETIC and COLOURED
Peroxides are STRONG reducing agents where as superoxides are strong oxidising agents

Answer :D
Discussion
25.

Select the correct statement with respect to carbon monoxide.

Answer»

It combines with WATER to GIVE carbonic acid
It REACTS with haemoglobin irreversibly 
It is a POWERFUL oxidizing agent 
It is used to prepare aerated drinks 

Answer :B
Discussion
26.

Select the correct statement/s

Answer»

`H^(+)` can exist as `H_(9)O_(4)^(+)`in water
Electrolysis of fused sodium hydride produces `H_(2)` at the anode
Hydride ion is larger that any of the halide ions except iodide ion
Allare correct

Solution :All statements are correct. Please note the IONIC sizes : `H^(-)` (208 pm), `F^(-)` (136 pm) , `CL^(-)`(181 pm), `Br^(-)` (196 pm) and `I^(-)` (219 pm)
Discussion
27.

Select the correct statement out of the following

Answer»

CaF is soluble in WATER
`BaSO_(4)` is soluble in water
`Ba(OH)_(2)` is insolube in water
`MgSO_(4)` is soluble in water

Solution :Arrording to the ORDER of solubilities only `CaF_(2)` among `CaF_(2) , BaSO_(4), Ba (OH)_(2) and MgSO_(4)` is soluble in water
Discussion
28.

Select the correct statement out of following:

Answer»

`NO_(3)^(-)` gives brown RING test in PRESENCE of dil. `H_(2)SO_(4)`
During chromyl chloride test change in oxidation state of chromium TAKES place
On passing `H_(2)S` gas into AQUEOUS solution of `SO_(2)` gas CLEAR solution is produced
Alkaline solution of `K_(2)HgI_(4)` is known as Nessler's reagent

Answer :D
Discussion
29.

Select the correct statement. In the gas equation, PV=nRT

Answer»

n is the number of MOLECULES of a gas
n MOLES of the gas have a VOLUME V
V denotes volume of one mole of the gas
P is the pressure of the gas when only one mole of gas is present.

Answer :B
Discussion
30.

Select the correct statement. (i) Delocalisation of sigma-electron is hyperconjugation. (ii) Delocalisation of pi-electron is resonance. (iii) Partial displacement of sigma-electron is inductive effect.

Answer»

i & III
II & iii
i & ii
i, ii, iii

Answer :D
Discussion
31.

Select the correct statement for the following species.

Answer»

(I) and (III) are geometrical isomers.
(I) and (II) are CONFORMATIONAL pairs.
(III) and (IV) are conformational pairs.
(II) and (IV) are geometrical ismoers.

Solution :If all equatorial convers into AXIAL and all axial converts into equatorial then it is conformational isomerism, bet id only one equatorial or axial CONCERTS into axial or equatorial respectively, it is geometrical isomerism.
Discussion
32.

Select the correct statement about the compound NO[BF_(4)]

Answer»

It has `5 sigma` and `2pi`bonds
Nitrogen - oxygen bond length is higher than Nitric OXIDE
`"B-F"` bond energy in this compound is more than in `BF_(3)`
It is a diamagnetic substance

Answer :A::D
Discussion
33.

Select the correct statement about harium :

Answer»

it SHOWS photoelectric effect
it is silvery while METAL
It FORMS `Ba(NO_(2))^(2)` which is used in preparation of green FIRE
it IONISATION energy is less than radium

Solution :According to properties Ba is silvery white metal, it forms `Ba(NO_(3))_(2)` which is used in preparation of green fire and its ionisation energy is less than radium
Discussion
34.

Select the correct statement.

Answer»

Among the alkali METALS, only lithium reacts witjh NITROGEN DIRECTLY at ROOM temperature of from nitride.
Among the alkali metal corbonated, `Li_(2)CO_(3)` has the lowest thermal staybility.
Among the jalkali metal hyderoxide. ChOH has the highest solubility in water
All of these

Answer :D
Discussion
35.

Select the correct statemens for following equilibrium:

Answer»

On INCREASING PRESSURE, melting point decreases while boiling point of `CO_2` INCREASES.
On increasing pressure, melting point decreases while boiling point increases for `H_2O`
On increasing pressure,sublimation temperature increases for both `CO_2 and H_2O`
On increasing pressure,sublimation temperature increases for `CO_2` but decreases for `H_2O`.

ANSWER :A::B::C
Discussion
36.

Select the correct set of statement/s: I. Work done by the surrounding in case of infinite stage expansion is more than single stage expansion II. Irreversible work is always greater than reversible work. III. On an ideal gas in case of single stage expansion and compression system as well as surrounding are restored back to their original states IV. If gas is in thermodynamic equilibrium is taken from A to state B, by four successive single stage expansions. Then we can plot 4 points on the P-V indicator diagram.

Answer»

II
I, II, III, IV
I, IV
I, II, IV

Solution :`W_("rev") GT W_("irr")` in expansion
FOUR STEPS `rArr` four points
Discussion
37.

Select the correct satement regarding the following compouns :

Answer»

II has a GREATER DIPOLE moment than I
Covalent character of II is LESS than I
I is more soluble in polar solcent than II
None of these

Solution :
both rings are aromatic so, it will be polar in NATURE.
Discussion
38.

Select the correct order of thermal stability ?

Answer»

`HI GT HBR gt HF gt HCl`
`HI gt HBr gt HCl gt HF`
`HF gt HCl gt HBr gt HI`
`HI gt HF gt HBr gt HCl`

ANSWER :B
Discussion
39.

Select the correct order of heat of hydrogenation?

Answer»

`IgtIIgtIIIgtIV`
`IVgtIIIgtIIgtI`
`IIgtIIIgtIVgtI`
`IIgtIIIgtIgtIV`

ANSWER :B
Discussion
40.

Select the correct option related to stability of following structures.

Answer»




`H-OVERSET(O)overset(||)(C)-overset(Θ)(O)GT CF_(3) - overset(O)overset(||)(C)-overset(Θ)(O)`

ANSWER :C
Discussion
41.

Select the correct expressions among the following

Answer»

`(DELTA G - Delta H)/(T) = ((del Delta G)/(del T))_(P)`
`(Delta G -Delta H)/(T ) = ((del Delta G)/(del T))_(V)`
`(Delta S)/(NF) = ((del E_("cell"))/(del T))_(P)`
`((del T)/(del P))_(H) = (-((del H)/(del P))_(T))/(C_(P))`

Solution :`((del Delta G)/(del T))_(P) = - Delta S rArr Delta G = Delta H + T ((del Delta G)/(del T))_(P)`
`rArr ((del Delta G)/(del T))_(P) = (Delta G- Delta H)/(T)`
`Delta G = - n FE_("cell")`
`rArr ((del Delta G)/(del T))_(P) = nF ((del E_("cell"))/(del T))_(P) = - Delta S`
`rArr (Delta S)/(nF) = ((del E_("cell"))/(del T))_(P)`
`((del T)/(del P))_(H) = mu_(JT) = ((-del H)/(del P))_(T) XX (1)/(C_(P))`
Discussion
42.

Select the correct conditions indicated below the following plots :

Answer»




ANSWER :A::C::D
Discussion
43.

Select the correct conclusion (s) about averagelife:

Answer»

Average LIFE `= 1//lambda`
Average life `= 1.44 XX t_(1//2)`
The time in which 63.2% element decays is called average life
None of the above

Answer :A::B::C
Discussion
44.

Select the correct choice for given statements. T for true and F - for false (i) The physical properties of hydrogen are like those of metals. (ii) Some chemical properties of hydrogen are those of metals and of non-metals. (iii) Metals of groups 7, 8 and 9 form nonstoichiometric hydrides. (iv) The percentage of water in natural sources like rivers is 2.04.

Answer»

i-F,ii-T,iii-F,iv-F
i-T,ii-T,iii-T,iv-F
i-T,ii-F,iii-F,iv-F
i-F,ii-T,iii-F,iv-T

Answer :A
Discussion
45.

Select the correct choice for given reactions: (i) 2Na +2H_(2)O to X (ii) 2F_(2)+2H_(2)O to Y (iii) H_(2)S +2H_(2)O to Z

Answer»

`X=2Na_(2)+H_(2)`
`Y=4OH^(-)+4F^(-)+O_(2)`
`Z=HS^(-) +H_(3)O^(+)`
`X=2NaOH+H_(2)`
`Y=4H_(3)O^(+)+4F^(-)`
`Z=S^(2-)HS^(-)`
`X=2Na_(2)O_(2)+H_(2)`
`Y=4H_(3)O^(+)+4F^(-)+O_(2)`
`Z=2H_(3)O^(+)+HS^(-)`
`X=2NaOH+H_(2)`
`Y=4H^(+)+4F^(-)+O_(2)`
`Z=2H_(3)O^(+)+S^(2-)`

Solution :(i) `2Na+2H_(2)O to UNDERSET(X)ubrace(2NaOH+H_(2))`
(ii) `2F_(2)+2H_(2)O to underset(Y) ubrace(4H^(+)+4F^(-)+O_(2))`
(III) `H_(2)S+2H_(2)O to underset(Z) ubrace(2H_(3)O^(+)+S^(2-))`
Discussion
46.

Select the correct choice for given reaction after balancing. 4HgS+4 CaO rarr 4Hg+ x + CaS

Answer»

`x=HgSO_(4)`
`x=CaSO_(4)`
`x=HgSO_(3)`
`CaSO_(3)`

SOLUTION :Balanced REACTION is as :
`{:(4HgS + 4CaO RARR 4 Hg + CaSO_(4) + 3 CAS),(""x):}`
Discussion
47.

Select the compound in each of the following pairs that can be converted to corresponding alkyl bromide more rapidly on being treated with hydrogen bromide : l(i) 1-butanol or 2-butanol (ii) 2-methyl-1-butanol or 2-butanol (iii) 2-methyl-2-butanol or 2-butanol

Answer»

SOLUTION :(i) 2-Butanol (II) 2-Butanol (III) 2-Methyl-2-butanol
Discussion
48.

Select the compound which can undergo intramolecular cannizaro reaction in basic medium

Answer»

A,B,D
B,C,D
A,B,C
B,C

Solution :Alcohols cannot INVOLVE in intra molecular cannizaro reaction and TERMINAL gem DIHALIDES on basic HYDROLYSIS gives aldehydes.
Discussion
49.

Select the compound/ions which is/are anti-aromatic

Answer»




SOLUTION :For aromatic-COMPOUND should be cyclic, `sp^(2)` hybridised, PLANAR, `(4n+2)PIE^(-)` for anti-aromatic-compound should be cyclic, `sp^(2)` hybridised, planar, `(4n)pie^(-)`
Hence compound A and D has anti-aromatic CHARACTER.
Discussion
50.

Select the chiral molecule.

Answer»




SOLUTION :N//A
Discussion