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.

Which are the acids of this reaction ? HCl_((aq)) +H_2O_((aq)) hArr H_3O_((aq))^(+) + Cl_((aq))^(-) Which base is weak?

Answer»

SOLUTION :`H_2O` and `CL^-` are BASES , In which `Cl^-` is WEAK BASE.
Discussion
2.

Write hydrocarbon radicals that can be formed as intermediates during mono chlorination of 2-methylpropane ? Which of them is more stable ? Give reasons.

Answer»

SOLUTION :2-methyl propane GIVES two TYPES of radicals : `CH_(3)-CH(CH_(3)) rarr CH_(3) - ""^(**)C(CH_(3))-CH_(3)+CH_(3)-CH(CH_(3))-""^(**)CH_(2)`
Tertiary `3^(@)` free radical Primary `1^(@)` free radical
Tertiary `3^(@)` radical is more stable because it has `9 alpha` Hydrogen and due to hyper conjugation structures it STABILIZED Primary `1^(@)` free radical is less stable because of only 1 `alpha` hydrogen and one hyper conjugative structure.
Discussion
3.

Which of the following niolecule does not contain chiral centre (s)

Answer»




SOLUTION : D cannot EXHIBIT GEOMETRICAL ISOMERISM.
Discussion
4.

What is the deviation from aufbau principle or (n + l) rule in case of electronic configuration of La (Z = 57) ?

Answer»

SOLUTION :One ELECTRON enters 5D before FILLING of 4f starts
Discussion
5.

Which of the following is the correct order of strength of necleophiles in polar aprotic solvents

Answer»

`C_(2)H_(5)bar(O) gt bar(O)H`
`(CH_(3))_(3)Cbar(O) LT CH_(3)bar(O)`
`CH_(3)bar(O) gt bar(O)H`
`RCObar(O) gt RCOOH`

SOLUTION :Nucleophlicity
Discussion
6.

Which one is a wrong statement-

Answer»

the VALUE ofm and `m_(z^(2))` is zero
total orbital angular momentum of electron in 's' orbital is equal to zero
the ELECTRONIC configuration of N-atom is

an orbital is designated by THREE quantum numbers while an electron in an atom is designated by four quantum numbers

Solution :The electronic configuration of N:
.
Discussion
7.

Which of the following elements does not form hydride by direct heating with dihydrogen ?

Answer»

Be
Mg
Sr
Ba

SOLUTION :Only `BeH_(2)` cannot be prepared by direct combination with `H_(2)` is GROUP II. It is prepared by REACTING `BeC_(2)` with `LiAlH_(4)`.
`2BeCl_(2)+LiAlH_(4)to 2BeH_(2)+LiCl+AlCl_(3)`
Discussion
8.

When wine is put in air, it becomes sour due to

Answer»

Bacteria
Oxidation of `C_(2)H_(5)OH` in to `CH_(3)COOH`
Virus
Formic ACID formation

Answer :B
Discussion
9.

White phosphorus P_(4) has the following characteristics.

Answer»

6 P-P single bond
(B) 4 P-P single bonds
4 lone pair of electrons
P-P-P ANGLE of `60^(@)`

SOLUTION :STATEMENT (b) is wrong while all other statements are correct.
Discussion
10.

Which one of thefollowingpairswouldhave a larger size ? Explain (i) K " or" K^(+) (ii) Br " or" Br^(-)(iii) O^(2-) " or" F^(-)(iv)Li^(+)" or" Na^(+) (v) P " or"As (vi) Na^(+)" or" Mg^(2+)

Answer»


Solution :Forn=4the electronic CONFIGURATION = (4-1) `d^(1) 4s^(2) =3d^(1) 4s^(2)`. Theelementcorrespondingto this CONFIGURATIONS is scandium whichis a d- blockelement.
Group NUMBER = Noof ELECTRONS in (n-1) d subshell + No. of electrons in the
Discussion
11.

Which of the following does not decrease with rise in temperature ?

Answer»


ANSWER : MOLALITY and MOLE FRACTION
Discussion
12.

Which of the following is/are amphoteric ?

Answer»

BEO
`Ag_(2)O`
`CO_(2)`
`SnO_(2)`

Solution :BeO, `SnO_(2)` are AMPHOTERIC
Discussion
13.

Which among the following is Z-Isomer ?

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Solution :As PER CIP if same PRIORITY group are at same side then it is Z
Discussion
14.

Trouton's rule gives the relation between

Answer»

`T_(b)` and `T_(C)`
`T_(b)` and CRITICAL pressure
Enthalpy of vaporisation BOILING point
Normal boiling point and boiling point

Solution :FACTUAL QUESTION
Discussion
15.

The structure of Cr_2O_7^(2-)

Answer»
Discussion
16.

What is the pressure of 2 mole of NH_(3) at 27^(@)C when its volume is 5 litre in van der Waals equation ? (a=4.17, b=0.03711)

Answer»

<P>10.33 atm
9.33 atm
9.74 atm
9.2 atm

Solution :`(P+(an^(2))/(V))(V-nb)=NRT`
or `P=(nRT)/(V-nb)-(an^(2))/(V^(2))`
`=(2xx0.0821xx300)/(5-2xx0.03711)-(4.17xx2^(2))/(5^(2))`
`10-0.66=9.33" atm"`
Discussion
17.

Which salt hydrolyses to a minimum extent

Answer»

`MG(NO_(3))_(2)`
`Be(NO_(3))_(2)`
`CA(NO_(3))_(2)`
`Ba(NO_(3))_(2)`

Solution :`Ba(NO_(3))_(2)` results in a neutral solution as it is a salt of strong ACID `(HNO_(3))` and strongbase `[Ba(OH)_(2)]`
Discussion
18.

Write down the possible applications of H_2O_2 on the basis of its oxidising property.

Answer»

SOLUTION :(i) Due to its oxidising property, it is USED as a valuable bleaching AGENT, powerful but harmless disinfectat and germicide
(ii) Delicate materials LIKE silk, wood, hair can be bleached with `H_2O_2`.
Discussion
19.

The standard heats of formation values of SF_(6)(g),S(g)" and "F(g)are respectively -100, 275 and 80 kJ mol^(-1). Estimate the averuge S-F bond energy sulphur herafluoride.

Answer»


ANSWER :309.2KJ
Discussion
20.

x+"Coke" +Cl_(2)rarr Q + CO uarr Q + LiAlH_(4) rarr Y + LiCl + AlCl_(3) Y + NaH rarr T If "Y" is a hydride which on hydrolysis under appropriate conditions produces a weak monobasic acid M, then choose the correct statement(s) based on above sequence of reactions:

Answer»

X is ACIDIC oxide
Q is a Lewis acid
Equivalent weight of M in its reaction with a base under SUITABLE condition is 62
M can also be obtained by hydrolysis of BN under appropriate conditions.

Answer :A::B::C::D
Discussion
21.

Which of the following metal nitrate produce NO_(2) on heating?

Answer»

`HG(NO_(3))_(2)`
`RbNO_(3)`
`PB(NO_(3))_(2)`
`CU(NO_(3))_(2)`

Answer :A::C::D
Discussion
22.

Which of the following will be the final product when C_2H_2 react with HCI?

Answer»

`H_2C = CHCl`
`CH_3 - CH_2 Cl`
`CH_3 - CHCl_2`
`ClHC = CHCl`

SOLUTION :`CH -=CH + HCl underset("addition")OVERSET("markovnikoff")to CH_3CHCl_2 `
Discussion
23.

When X-rays pass through air they:

Answer»

PRODUCE LIGHT TRACK in the air
ionise the GAS
produce FUMES in the air
accelerate gas atoms

Answer :A
Discussion
24.

When rain water is named as acid rain?

Answer»

Solution :Rain water normally has a pH of 5.6 due to dissolution of atmospheric `CO_(2)` particles into it. OXIDES of sulphur and nitrogen in the atmosphere are absorbed by DROPLETS of water that make up clouds and get chemically converted into sulphuric ACID and nitric acid. As a result the pH otf rainwater drops below 5.6 and hence it is called acid rain.
Discussion
25.

What do youunderstandisoelectronicspecies? Namethe speciesthat will be isoelectronicwitheach of thefollowingatoms ofions(i) F^(-)(ii) Ar(iii) Mg^(2+)(iv) Rb^(+)

Answer»

<P>

Solution :Ionsof differentelements whichhave thesame numberof electrons butdifferentmagnitude ofthenuclear chargeare calledisoelectronic ions.
(i) `F^(-) ` has 10 (9+1)electrons . Thereforethe speciesnitrideion `N^(3-) (7+3)` , oxide, `O^(2-) (8+2) ` neon,Ne (10+0) , sodium ion `Na^(+) (11-1)` , magnesiumion `Mg^(2+) (12-2)` aluminium ion `A1^(3+) (13-3) ` etc .
eachone of which contains10 electronsare isoelectronic with it.
(ii) Ar has 18electrons . Thereforethe speciesphosphideion , `P^(3-)(15+3)` sulphideion , `S^(2) (16 +2),` chlorineion `(C1^(-)(17+1)` potassiumion `K^(+) (19-1)`calcium ion `Ca^(2+) (20-2)` etc. eachone ofwhichcontains18 electrons areisoelectronswith it.
(ii) `Mg^(2+)` has 10 (12-2) electrons thereforethe species`N^(3-) , O^(2) , F^(-) , Ne , Na^(+) , A1^(3+)` etc, each oneofwhichcontains10 electrons are isoelectronic withit.
(iv) `RB^(+)` has 36 (37-1) elecrons. Thereforethe species bromideion `B^(-) (35+1)` KRYPTON, Kr (36 + 0) andstrontium `Sr^(2+) (38-2)` each oneof whichhas 36electrons, areisoelectronicwith it.
Discussion
26.

Which dipole moment of the following will zero ? NH_(3), PH_(3), BH_(3) , AIH_(3) ?

Answer»

Solution :`BH_(3) and AlH_(3) RARR mu = 0 ` but,
`NH_(3) and BH_(3) rarr mu NE 0 `
Discussion
27.

We know that the relationship between K_(e) and K_(p) is K_(p)=K_(c)(RT)^(Delta n) What would be the value of Delta n for the reaction NH_(4)Cl(s)hArr NH_(3)(g)+HCl(g)

Answer»

<P>1
0.5
1.5
2

Solution :`DELTA N= (n_(p)-n_(R))g=2-0=2`.
Discussion
28.

What is the difference between molality and molarity ?

Answer»

Solution :Molailty : It is DEFINED as the number of moles of solute dissolved in 1 kg of solvent. It is INDEPENDENT of temperature.
Molarity : It is defined as the number of moles of solute dissolved in 1 L of solution. It DEPENDS UPON temperature.
Discussion
29.

Which of the following set of quantum number is possible?

Answer»

`n = 4 "" l = 2 "" m = -2 "" s = -2`
`n = 4 "" l = 4 "" m = 0 "" s = 1//2`
`n = 4 "" l = 3 "" m = -3 "" s = 1//2`
`n = 4 "" l = 0 "" m = 0 "" s = 0`

Answer :C
Discussion
30.

What do you understand by catenation ?

Answer»

Solution :Catenation : The atoms of some elements (such as carbon) can link with ONE ANOTHER through strong COVALENT bonds to form long CHAINS or branches. This property is known as catenation. It is most COMMON in carbon and quite significant in Si and S.
Discussion
31.

When two reactants A and B are mixed to give product 'c' and 'p' the reaction quotient 'Q' at the initial stages of the reaction will be?

Answer»

Solution :In the beginning of the reaction Q = 0. As the reaction proceeds in the FORWARD direction Q STARTS increasing.
At CHEMICAL equilibrium Q = K
Discussion
32.

what type of substances show antiferromagnetism ?

Answer»

SOLUTION :Substances which are expected to posses PARAMAGNETISM or ferrmagnetism but ACTUALLY posses zeromagnetic moment show ANTIFERROMAGNETISM e.g., MnO.
Discussion
33.

Which one of the following statement is incorrect ?

Answer»

Stability decreases with INCREASE in size of central atom.
Resonance structure give S!ABILITY to a I molecule.
Bond polarity can be explained on the basis of LEWIS principle.
Geometrical shape of `BF_(4)^(-1)` is tetrahedral.

Answer :C
Discussion
34.

Write which out of O_(2)^(+) and O_(2)^(-) is more stable.

Answer»

SOLUTION :`O_(2)^(-)`
Discussion
35.

Which one is the wrong statement ?

Answer»

de-Broglie's wavelength is given by `lamda = (h)/(mv)` where m is the mass of the particle, `v =`groups velocity of the particle
The uncertainty principle is `Delta E XX Delta t ge (h)/(4pi)`
Half-filled and fully-filled orbitals have greater stability due to greater exchange energy, greater SYMMETRY and more BALANCED arrangement
The energy of 2S orbitals is LESS than the energy of 2p orbital in case of hydrogen like atoms

Solution :Energy of 2s and 2p orbitals is equal in case of hydrogen like atoms.
Discussion
36.

Which is the decreasing order of acidity in, I) HCOOH "II) "CH_(4)COOH"III) "CH_(3)CH_(2)COOH"IV) "C_(6)H_(5)COOH

Answer»

`I GT II gt III gt IV`
`IV gt III gt II gt I`
`IV gt I gt II gt III`
`I gt IV gt II gt III`

Solution :Among GIVEN based on l-effects & R-effect is less ACIDIC than HCOOH & ORDER of acidity is stabilize the Benzene.
Discussion
37.

Which of the organic compounds will give white precipitate with AgNO_(3)?

Answer»

`C_(6)H_(5)NH_(3)^(+)CI^(-)`
`NACI`
`C_(6)H_(5)CI`
2,6,6-Trinitrochlorobenzene

Answer :A::D
Discussion
38.

Which of the following reactions is an example of a redox reaction ?

Answer»

`XeF_(4)+O_(2)F_(2)toXeF_(6)+O_(2)`
`XeF_(2)+PF_(5)to[XeF]^(+)PF_(6)^(-)`
`XeF_(6)+H_(2)OtoXeOF_(4)+2HF`
`XeF_(6)+2H_(2)OtoXeO_(2)F_(2)+4HF`

Solution :Reaction (B), (C) and (D) are not REDOX reaction In reaction (A), `O_(2)F_(2)` is oxidising AGENT and `XeF_(4)` is reducing agent.
Discussion
39.

What is equilibrium ?

Answer»

SOLUTION :Equilibrium means, the STAGE of the system, when the rates of the FORWARD and reverse REACTIONS become EQUAL.
Discussion
40.

Which of the following is favourable condition for the formation of ionic bond?

Answer»

Small CATION with small CHARGE
Small anion with large charge
Large DIFFERENCE IRI the electronegativity
Small cation with high charge

Answer :C
Discussion
41.

Which of the following is used as desiccants to remove moisture from organic solvents?

Answer»

CALCIUM hydride
LiAlH
SODIUM BORO hydride
Sodium hydride

Answer :a
Discussion
42.

What type of solids are electrical conductors, malleable and ductile ?

Answer»

SOLUTION :METALLIC SOLIDS
Discussion
43.

The skeletal structureof CH_(3) COOH as shown belowis correct , but some of the bonds are shown incorrectly . Write the correct Lewis structurefor a acetic acid. H= overset(H)overset(|)underset(H) underset(|)C- overset(":O:")overset(|) underset(cdotcdot)C- underset(cdotcdot)O - H

Answer»

SOLUTION :`H- OVERSET(H)overset(|)UNDERSET(H) underset(|)C- overset(":O:")overset(||) C- underset(cdotcdot)overset(cdotcdot)O - H`
Discussion
44.

Which one of the following components of cement sets at the slowest rate: Dicalcium silicate, Tricalcium silicate, Tricalcium aluminate, Tricalcium aluminoferrite.

Answer»

DICALCIUM SILICATE
Tricalcium silicate
Tricalcium aluminate
Tricalcium aluminoferrite.

Solution :Dicalcium silicate
Discussion
45.

The weight of iodine liberated when excess of KI reacts with 500 ml of 1 M H_2O_2is

Answer»

254 GR
127 gr
535 gr
508 gr

Answer :B
Discussion
46.

X,Y and Z reaction are :

Answer»

SIMPLE hydration reaction
HYDROBORATION OXIDATION, hydration and OXYMERCURATION demercuration
Hydroboration oxidation, oxymercuration demercuration and hydration
Oxymercuration demercuration , hydroboration oxidation and hydration

Solution :X=Hydrobroation oxidation, Y=oxymercuration & demercuration, Z=Simple hydration reaction
Discussion
47.

Which of the following statements is not true about the effect of a n increase in temperature on the distribution of molecular speeds of an ideal gas?

Answer»

The AREA under the CURVE remains same EVEN at the higher temperature.
The distribution pattern becomes more uniform.
Fraction of molecules with speed greater than a particular high speed will INCREASES.
The fraction of molecules having most probable

Answer :d
Discussion
48.

When a crystal of NaOH is exposed to air a liquid layer is developed on its surface because

Answer»

CRYSTAL metls
It LOSES water to the surroundings
It absorbs moisture and `CO_(2)` from the surroundings
It undergoes sublimation

Answer :C
Discussion
49.

Thermal stability of II A carbonates from BeCO_(3) to BaCO_(3)

Answer»

Increases
Decreases
May increases (or) decreases
Can not be in a regular

Solution :As LATTICE energy of CORRESPONDING OXIDES decreases from Be to Ba THE4 thermal stabilityof their carbonates increases from `BeCO_(3)` to `BaCO_(3)`.
Discussion
50.

Which one of the following is lyophilic colloid

Answer»

Gelatin
Sulphur
gold
Carbon

Answer :A
Discussion