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 type of Van der Waals attractive forces exists in a vessel filled with N_(2) molecules ?

Answer»

DISPERSION FORCES and DIPOLE - Dipole Forces
Dipole - Dipole Forces
Dispersion Forces
Dispersion Forces

ANSWER :D
Discussion
2.

Which of the following compound is expected to undergo fastest electrophilic aromatic substitution than unsubstituted benzene

Answer»




Solution :GROUP which INCREASES ELECTRON DENSITY on benzene ring help the compound to undergo faster electrophilic aromatic substitution.
Discussion
3.

The solubility product of AgCl at a particular temperature is 1.08xx10^(-10)mol^(2)dm^(-6). Calculate its solubility in 0.01 M HCl.

Answer»

Solution :In the presence of a common ion with the concentration of c MOL `DM^(-3)`, the solubility S of the sparingly soluble salt is generally given by `(K_(sp))/c`.
`AgClhArrunderset(S)(AG^(+))+underset(S)(Cl^(-))`
`underset(0.01M)(HCl)tounderset(0.01M)(H^(+))+underset(0.01M)(Cl^(-))`
Solubility of AGCL, `K_(sp)=[Ag^(+)][Cl^(-)]`
`1.08xx10^(-10)=(S)(S+0.01)`
Assuming S to be small when compared to 0.01
`S+0.01~~0.01`
`therefore1.08xx10^(-10)=(S)(0.01)`
Solubility (S) = `(1.08xx10^(-10))/0.01=1.8xx10^(-8)"mol "dm^(-3)`.
Discussion
4.

What is the minimum volume of water required to dissolve 1 g of calcium sulphate at 298 K. K_(sp) for CaSO_(4) is 9.0xx10^(-6).

Answer»

2.45 L
4.08 L
4.90 L
3.00 L

Solution :`CaSO_(4)(s)+AQ hArr Ca^(2+)(aq)+SO_(4)^(2-)(aq)`
`K_(sp)=[Ca^(2+)][SO_(4)^(2-)]`
Suppose thesolubility of `CaSO_(4) = s "mol" L^(-1)`
`K_(sp)=sxxs=s^(2)`
`9.0xx10^(-6) = s^(2) or s=3xx10^(-3) "mol" L^(-1)`
Molar MASS of `CaSO_(4) = 40 + 32 + 64 = 136 g "mol" ^(-1)`
`:. 1g CaSO_(4) = (1)/(136) ` mol
`3xx10^(-3)` mol of `CaSO_(4)` require minimum WATER to dissolve = 1 L
`:. (1)/(136) ` molof `CaSO_(4)` will require water
`=(1)/(3xx10^(-3))xx(1)/(136) ~=2.45 L`
Discussion
5.

Which of the following is the correct form ula for one m ole of p h o to n energy ?

Answer»

`(Nh)/(LAMBDAC)`
`(hc)/(lambda)`
`(NHC)/(lambda)`
`(NC)/(lambda)`

Answer :C
Discussion
6.

Which components are present in troposphere?

Answer»

SOLUTION :TROPOSPHERE is made of turbulent, DUSTY zone containing AIR, much water vapour and clouds.
Discussion
7.

What is the atomic number of the element, having maximum number of unpaired 2p electrons? To which group does it belong?

Answer»


ANSWER :NITROGEN (VII A GROUP)
Discussion
8.

What is the change ininternal energy of a system, if 10 J of heat is supplied to it and 15 J of work is done by it?

Answer»

SOLUTION :SINCE it is a CLOSED SYSTEM.
`Deltau=q-w`
`Deltau=10J-15J`
`Deltau=-5J`
Discussion
9.

Which of the following is a non-aromatic compound ?

Answer»




SOLUTION :(a) is non-aromic.
(B) is AROMATIC.
(C) is anti-aromatic
(d) is aromatic.
Discussion
10.

Using Stock notation, represent the following compounds : HAuCl_(4), TI_(2)O, FeO, Fe_(2)O_(3), CuI, CuO, MnO and MnO_(2).

Answer»

Solution :The OXIDATION number of the metallic ELEMENT Au in `HAuCl_(4)` is +3. Hence, the compound is REPRESENT as `HAU(III) Cl_(4).`
Discussion
11.

The threshold wavelength for the ejection of electron from metal is 330 nm, then work function for the photoelectric emission is

Answer»

`6XX10^(-12)` J
`6xx10^(-19)` J
`1.2xx10^(-20)` J
`1.2xx10^(-18)` J

Solution :`W=hv_(0)`
`W=(hc)/lambda_(0)=(6.62xx10^(-34)xx3xx10^(8))/(330xx10^(-9))=6xx10^(-19)` J
Discussion
12.

X and Y are:

Answer»


ANSWER :A
Discussion
13.

The virial equation for 1mole of a real gas is written as : PV=RT [1+(A)/(V)+(B)/(V^(2))+(C)/(V^(3))+ ........ To higher power of n] Where A,B, and C are known as virial coefficients . If Vander wall's equation is written in virial form, then what will be value of B :

Answer»

`a-(B)/(RT)`
`b^(3)`
`b-(a)/(RT)`
`b^(2)`

ANSWER :4
Discussion
14.

Which of the following is a compound?

Answer»

`CO_2`
CL
`NH_3`
Both A and C

Answer :A
Discussion
15.

Write structureal formula of (a) Neopentane (b) Chlorobenzene (c) Propane.

Answer»

Solution :(a) `{:(""CH_(3)),("|"),(CH_(3)-C-CH_(3)),("|"),(""CH_(3)):}` (b) (c) `CH_(3)-CH_(2)-CH_(3)`
Discussion
16.

Total number of lonw pairs and bond pairs of electrons present around xenon in XeF_(4) is

Answer»


SOLUTION :
THUS , there are 4 BOND
pairs and 2 LONE pairs
presnet around XE.
Discussion
17.

The solubility product of AgClin water is 1.5xx10^(-10). Calculate its solubility in 0.01 M NaCl aqueous solution .

Answer»

SOLUTION :As NaCl dissociates completely, therefore, in 0.01 M NaCl solution, `[Cl^(-)] = 0.01M`
If SOLUBILITY of AgCl in 0.01 M NaCl solution is s MOL `L^(-1)`, then from AgCl that dissolves,
`[Ag^(+)]=[Cl^(-)]=s ` mol `L^(-1) :. ` Total `[Cl^(-)]=0.01 + s ~= 0.01M`
`K_(SP) ` for AgCl `=[Ag^(+)] [ Cl^(-)] = s xx 0.01 = 0.001 s :. 0.01 s = 1.5 xx 10^(-5) xx 10^(-10) or s= 1.5 xx 10^(-8) M`
Discussion
18.

What is relation between kinetic energy and temperature ?

Answer»

SOLUTION :`KE=(3)/(2)KT`
Discussion
19.

There are two constitutional isomers with the formula C_(2)H_(6)O . Write structural formulas of these isomers .

Answer»

Solution :If we RECALL that carbon form four covalent bonds oxygen can form TWO , and hydrogen only one , we can ARRIVE at the following constitutionalisomers .

It should be noted that these two isomers are clearly different in their physical PROPERTIES .At room temperature and 1 atm pressure ,dimethyl ether is a gas . Ethanol is a liquid .
Discussion
20.

The organic substance which contains both the sp and sp^(3) hydridised carbon atoms is

Answer»

n-Butane
Isobutane
2-Butyne
1, 3-Butadiene

Answer :C
Discussion
21.

What are X and Y respectively in the following reaction?Z-pro duct overset(Y)larr 2-butyn eoverset(X)toE - pro duct

Answer»

`Na//NH_(3(LIQ)) and Pd// BaSO_4 + H_2`
`Ni//140^(@)C and Pd//BaSO_4 + H_2`
`Ni//140^(@)C and Na//NH_3(liq)`
`Pd//BaSO_4 + H_2 and Na//NH_(3)(AQ)`

Solution :
Discussion
22.

Which of the following options does not represent ground state electronic configuration of an atom ?

Answer»

`Is^(2) 2s^(2) 2p^(6) 3s^(2) 3P^(6) 3d^(8) 4s^(2)`
`Is^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(9) 4s^(2)`
`Is^(2) 2s^(2) 2p^(6) 3s^(2) 3P^(6) 3d^(10) 4s^(1)`
`Is^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(5) 4s^(1)`

Solution :The correct configuration should be `Is^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(1)` for so, copper which has atomic number 29 (2gCu). Due to extra stability of full filled orbital of d-subshell, the last ELECTRON enter into d-orbital insted of s-orbital.
Discussion
23.

Which of the following statement is/are not correct?

Answer»

I.P.increases down the group
I.P. of s-block element is LESS than corresponding d-block elements
If `DELTA` I.P. `GT` 16 EV, higher oxidation state is more stable
I.P. of HALOGEN elements is maximum in their respective period

Answer :A::C::D
Discussion
24.

Which of the following alloy is needed to make PbEt_(4) ?

Answer»

`Mg-Pb`
`Na-Pb`
`Mg-Al`
`Pb-Cs`

ANSWER :B
Discussion
25.

Which one of the following ore dies not contain magnesium ?

Answer»

CARNALLITE
DOLOMITE
CRYOLITE
All of these

ANSWER :C
Discussion
26.

The solubility of sulphates of alkaline earth metals in water shows the order

Answer»

`Be gt CA gt MG gt BA gt SR`
`Mg gt Be gt Ba gt Ca gt Sr`
`Be gt Mg gt Ca gt Sr gt Ba`
`Mg gt Ca gt Ba gt Be gt Sr`

Answer :C
Discussion
27.

Which of the following angle corresponds to sphydridisation ?

Answer»

`90^(@)`
`120^(@)`
`180^(@)`
`109^(@)`

Solution :`SP^(2)` hybridisation gives three `sp^(2)`hybrid orbitals which are planar tringular forming an ANGLE of `120^(@)`
with each other.
Discussion
28.

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to 8/9 times the Rydberg's constant if the electron jumps from

Answer»

`N = 3 " to " n = 1`
`n = 10 " to " n = 1`
`n = 9 " to " n = 1`
`n = 2 " to " n = 1`

Solution :`bar(v) = R_(H) ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))`
`(8)/(9) R_(H) = R_(H) ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) or (1)/(n_(1)^(2)) - (1)/(n_(2)^(2)) = (8)/(9)`
This is so only when `n_(1) = 1, n_(2) = 3`
Discussion
29.

What is molar enthalpy of vaporization ?

Answer»

SOLUTION :Amount of heat REQUIRED to vaporize ONE MOLE of a liquid at CONSTANT temperature and under standard pressure (1 bar) is called molar enthalpy of vaporization.
Discussion
30.

The substances used as an antichlor in bleaching is

Answer»

`Na_(2) S_(2)O_(3)`
`NAOH`
`Na_(2)SO_(4)`
`NaCl`

Solution :`Na_(2) S_(2) O_(3), H_(2)O_(2), Na_(2) SO_(3), ` ETC. can be used to remove excess of `Cl_(2).`
Discussion
31.

Whichtypeof spectraobtainedif electrontransists fromM - orbitto L-orbit ?

Answer»

ABSORPTION
EMISSION
CONTINUOUS
spectrawill notobtain

ANSWER :B
Discussion
32.

What is strong electrolyte ? Give examples.

Answer»

Solution :A strong ELECTROLYTE is DEFINED as a substance which dissociates almost completely into ions in AQUEOUS solution and hence is a very good conductor of electricity. e.g. NaOH, KOH, HCI, `H_2SO_4`, NACL, `KNO_3`, etc.
Discussion
33.

What is co-ordinate covalent bond ?

Answer»

Solution :The type of covalent BOND in which electron pair require for bond formation is denoted by only one ATOM form the two atom join together. e.g. : In CO triple bond`(C epuiv O) ` EXIST in which one is co-ordinate covalent bond

Both electrons are of oxygen in tripal bond between C and O.
Discussion
34.

Which of the following will not give positive test with CHCl_(3)//KOH.

Answer»

`CH_(3)-CH_(2)-NH-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-NH_(2)`

`CH_(3)-overset(CH_(3))overset(|)(CH)-NH_(2)`

ANSWER :A
Discussion
35.

Write down the outermost electronc configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?

Answer»


Solution :All the ELMENTS of GROUP (A) or I, i.e. Alkali metals have the similar outer electronic configuration, i.e., `ns^(1)` where n refers to the NUMBER of principle SHELL. These electronic configuration are given below.

Hence, placement of all the elements in group 1 of the periodic table because of similarity in electronic configuration and all the elements have similar properties.
Discussion
36.

Which of the following is most effective in causing the coagulation of ferric hydroxide sol?

Answer»

KCl
`KNO_(3)`
`K_(2)SO_(4)`
`K_(3)[FE(CN)_(6)]`

Answer :D
Discussion
37.

Which of the following statements is incorrect

Answer»

`Li^(+)` has minimum degree of hydration
The oxidation state of K in `KO_2` is +1
Na is used to make a Na/Pb ALLOY
`MgSO_4` is readily soluble in WATER

Solution :The hydration enthalpies of alkali metal ions DECREASES with increase in IONIC sizes. Hence, the order is `Li^(+) gt Na^(+) GTK^(+) gt Rb^(+) gt Cs^(+)`. Therefore `Li^(+)` has maximum degree of hydration.
Discussion
38.

What is the product when C_(5)H_(5)CH_(2)NH_(2) reacts with HNO_(2)?

Answer»

SOLUTION :`C_(6)H_(5)CH_(2)NH_(2) overset(HNO_(2))to C_(6)H_(5)CH_(2)OH + N_(2) uarr`
Discussion
39.

the solution of natural rubber in benzene is an example of :

Answer»

lyophobic acid
glucose
stearic acid
GLYCINE

Answer :B
Discussion
40.

Trimethylamine molecule is ............ in shape, while the shape of trisilylamine is ……………. .

Answer»

SOLUTION :PYRAMIDAL , TRIGONAL PLANAR
Discussion
41.

whichof thefollowingpair(s) represents (s)the isoelerontsspecies ?

Answer»

`S^(2-) andSc^(3+)`
`SO_(2) and NO_(3)^(-)`
`N_(2) and CN^(-)`
`NH_(3)and H_(3)O^(+)`

Solution :N/a
Discussion
42.

What is |W|^(2)? What isindicate ?

Answer»

SOLUTION :It givesprobabilityto findelectrons . It doeshavephysicalmeaningprobabilityto findelectron `ALPHA |W|^(2)`
Discussion
43.

Which one of the following is a correct set ?

Answer»

`H_2 O , sp^3`ANGULAR
`H_2 O , sp^2` LINEAR
`NH_(4)^(+) dsp^2`, SQUAREPLANAR
`CH_4 ,dsp^2` tetrahedral

Answer :A
Discussion
44.

Which is true statement?

Answer»

the layer of ICE on the surface of river in the winter acts as a thermal insulator between the WATER below and the air above
the fish and other MARINE organism are enabled to survive LONG PERIODS of freezing water due to the fact that ice is lighter than water
both correct
none is correct

Answer :C
Discussion
45.

Which statement is wrong for sulphur ?

Answer»

`S_2` is a paramagnetic
At `200^@C` temp. `S_8` is in cyclic form
At `600^@C` temp. `S_2` gas is in VAPOUR STATE
Oxidation state of sulphur in sulphur compounds is not less than +4.

Answer :D
Discussion
46.

When a copper wire is placed in a solution of AgNO_(3), the solution acquires blue colour. This is due to

Answer»

OXIDATION of Cu
REDUCTION of Cu
formation of a SOLUBLE complex
oxidation of Ag.

ANSWER :A
Discussion
47.

The volume of HCI gas weighing 73 g at STP is

Answer»

2.24 x 10-2m3

SOLUTION :HCl = Molar mass = 1 + 35.5 = 36.5 g
36.5 g of HCl occupies `2.24 xx 10^(-2) m^(3)` .
`:.` 73 g of HCI at STP will occupy `(2.24xx10^(-2))/CANCEL(36.5) xx cancel(73^(2))=4.48xx10^(-2)m^(3)`.
Discussion
48.

Which of the following is used as piezoelectric material ?

Answer»

Quartz
Dry ICE
`CO_(2)`
Silicones

Answer :A
Discussion
49.

Which one the following is true ?

Answer»

LITHIUM on direct combination with NITROGEN from `Li_(3)N`
Magnesium on direct combination with nitrogen from `Mg_(3)N`
Both (a) and (B)
Lithium and magnesium from bicarbonates.

Answer :C
Discussion
50.

What is responsible for the high melting and boiling points of water?

Answer»

HYDROGEN bonding
Strong forces
High reactivity
b & c

Answer :A
Discussion