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.

How many enantiomers are possibe on monochlorination of isopentane.

Answer»


ANSWER :4
Discussion
2.

How many enantiomeric pairs can be obtained by monobromination of isopentane?

Answer»

3
1
2
4

Answer :B
Discussion
3.

How many enantiomeric pairs are possible in bromochlorocyclopentane?

Answer»


SOLUTION :
Discussion
4.

How many enantiomer pairs are obtained by monochlorination of 2, 3-dimethylbutane

Answer»

Nil
Four
Two
ONE

SOLUTION :
Due to the presence of CHIRAL carbon it shows the optical activity and its mirror IMAGE are non superimposable so it shows one enantiomer PAIR.
Discussion
5.

How many elements are there in 3d-series elements ?

Answer»

SOLUTION :There are 10 elements in 3d-block SERIES from SC (21) to ZN (30).
Discussion
6.

How many elements are included in group 1:

Answer»

4
5
6
7

Answer :C
Discussion
7.

How many electrons should X_(2)H_(4) liberate so that in the new compound X shows oxidation number of -1//2(E.N. X gt H)

Answer»

Solution :Structure of `SO_(3)` or DOT structure of `SO_(3)`
`UNDERSET(1)O=underset(3)underset(O)underset(DARR)Srarrunderset(2)O`
Formal charge on `O^(1)=6-(2+4)=0`
Formal charge on `O^(2)=6-(1+6)=-1`
Formal charge on `O^(3)=6-(1+6)=-1`
Formal charge on `S=6-(4+0)=+2`
Discussion
8.

How many electrons would reflect in the nernst equation of the conversion of one mole of Mn_3O_4 in the MnO_2 ?

Answer»


SOLUTION :`Mn_3 O_4overset(4e^(-)//4F) to 3MnO_2 + 4 , (4-(8)/(3)) XX 3 = (12.8 xx 3)/(3) =4 `
Discussion
9.

How many electrons per second pass through a cross-section od a copper wire carrying 10^(-5)A ? (charge of 1 electron is 1.0 xx 10^(-19) coulomb ).

Answer»

`1.6 xx 10^(-36)`
`1 xx 10^(+14)`
6250
62500

Solution :96,500 C=1 mole of `E^(-) =6.023 xx 10^(23)`
`therefore` Number of ELECTRONS PASSING through wire of `10^(-5)` C=`(10^(-5)xx6.023xx10^(23))/(96,500)`
Discussion
10.

How many electrons occupy the bonding molecular orbitals of a C:N triple bond?

Answer»


ANSWER :6
Discussion
11.

How many electrons in chromium (Z=24)have l=0?

Answer»

8
6
10
7

Solution :`Cr:1s^(2)2s^(2)3s^(2)3p^(6)3D^(5)4S^(1)`
No. of ELECTRONS is s-orbitals=7.
Discussion
12.

How many electrons in an atom with atomic number 104 can have ( n +1) = 8 ?

Answer»

24
2
4
16

Answer :D
Discussion
13.

How many electrons in an atom can have n=3,l=2,m=-1?

Answer»

2
6
10
1

Answer :A
Discussion
14.

How many electrons in a given atom can have the following quantum numbers? n=3,l=2,m=+2,s=-1//2

Answer»

1
18
14
7

Solution :`CR(Z=24),[AR]3d^(5)4S^(1)`
No. of unpaired electrons =6
Discussion
15.

How many electrons flow when a current of 5 amperes is passed through a solution for 193 seconds ?

Answer»


Solution :3 Faraday of charge will evolve`Cl_(2)` (g)=33.6L
Quantity of charge passed (Q)`=(5 amp)xx(193 s)=965 C`
By PASSING 96500 C (1F) of charge, the electrons flowing `=6.022xx10^(23)`
By passing 965 C of charge, the electrons flowing `=(6.022xx10^(23))/((96500C))xx(965C)=6.022xx10^(21)`
Discussion
16.

How many electrons flow through a metallic wire if a current of 0.5 A is passed for 2 hours? (Given 1F=96,500 C mol^(-1))

Answer»

Solution :Charge flowing through the METALLIC wire`=Ixxt=0.5xx2xx60xx60C=3600C`
But charge flowing=no. of electrons flowing `XX`charge on each ELECTRON
`therefore3600=nxx1.60xx10^(-19)`
or `n=(3600)/(1.60xx10^(-19))=2.25xx10^(22)`.
Discussion
17.

How many electrons can have l=2and n=5?

Answer»

32
18
10
6

Solution :It CORRESPONDS to 5D SUBSHELL and will have 10 ELECTRONS.
Discussion
18.

How many electrons are there in one coulomb:

Answer»

`6.02xx10^(21)`
`6.25xx10^(18)`
`6.25xx10^(15)`
`6.024xx10^(16)`

ANSWER :B
Discussion
19.

How many electrons are present in t_(2g) set of d-orbitals of central metal cation in [Fe(H_(2)O)_(5)(NO)]SO_(4) brown ring complex?

Answer»

<P>

Solution :`IMPLIES[OVERSET(+1)(Fe)(H_(2)O)_(5)(NO)]^(2+)SO_(4)^(2-)`
`overset(+1)(Fe)(3d^(7))` in `(overset(+1)(Fe)(H_(2)O)_(5)(NO)]^(2+),Delta_(0) lt P`

Number of electrons in `t_(2g)` set of d-orbitals=5
Discussion
20.

How many electrons are lost and gained by 2 g of Cl^(-) ions and 1 g of Zn^(2+) ions as the result of electrolysis respectively ?(Cl = 35.5, Zn = 65)

Answer»

Solution :Number of equivalents of `Cl^(-)` ions `= ("weight")/("eq. wt.")`
`= (2)/(35.5)`
Number of equivalent of `Zn^(2+)` ions `= (1)/(65//2) = (2)/(65)`.
Now,1 MOLE (1F) of electric charge discharges 1 equivalent of matter.
MOLAR of electric charge involved in CASE of `Cl^(-) = (2)/(35.5)`
Mole of electric charge involved in case of `Zn^(2+) = (2)/(65)`.
As 1 mole of electric charge corresponds to AV. no. of electrons, thus, no. of electrons lost by `Cl^(-) = (2)/(35.5) xx 6.022 xx 10^(23)`
and no. of electrons gained by `Zn^(2+) = (2)/(65) xx 6.022 xx 10^(23)`.
Discussion
21.

How many electrons are present in 18mL of water?

Answer»

Solution :18mL WATER=18g water=1 mole water=`6.02xx10^(23)`
MOLECULES, each molecule consists 10 electrons (8 electrons per oxygen atom, 2 electrons for TWO hydrogen atoms). TOTAL electrons `=10xx6.02xx10^(23)=6.02xx10^(24)`.
Discussion
22.

How many electrons are present in 1.6 g of methane?

Answer»

Solution :GRAM molecular mass of METHANE, ltbr. `(CH_(4))=12+4=16g`
Number of moles in 1.6g of methane.
`=(1.6)/(16)=0.1`
Number of MOLECULES of methane in 0.1 mole
`=0.1xx6.02xx10^(23)`
`=6.02xx10^(22)`
One MOLECULE of methane has =6+4=10electrons
So, `6.02xx10^(22)` molecules methane have
`10xx6.02xx10^(22)` electrons
`=6.02xx10^(23)` electrons
Discussion
23.

How many electrons are involved in reduction of KMnO_4 in basic reduction?

Answer»


Solution :`MnO_(4)^(-) rarr MnO_2^(-) "(NEUTRAL // weak basic , )" MnO_4^(-) rarr MnO_(4)^(-) rarr MnO_4^(-2) `(Basic)
Discussion
24.

How many electrons are involved in the oxidation by KMnO_4 in acid medium ?

Answer»

5
3
1
7

Answer :A
Discussion
25.

How many electrons are involved in oxidation by KMnO_4 in basic medium

Answer»

one
five
three
four

Answer :A
Discussion
26.

How many electron are present in 2xx10^(-3) moles of ._(8)^(18)O^(2-)?

Answer»

`1.2xx10^(21)`
`9.6xx10^(21)`
`1.2xx10^(22)`
`1.9xx10^(22)`

ANSWER :C
Discussion
27.

How many electrons can have the values n=2, l=1,and s=+1//2 in the configuration 1s^(2)2s^(2)2p^(3)?

Answer»

1
3
5
7

Solution :CORRESPONDING to THREE VALUES of m `(-1,0,+1)`.
Discussion
28.

How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca^(2+) ion ?

Answer»

One
Two
Six
Three

Solution :SinceEDTA is hexadentate, THEREFORE, one molecule of EDTA combines with one `Ca^(2+)` ion to FORM an octahedral COMPLEX.
Discussion
29.

How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complexwith Ca^(2+) ion?

Answer»

Six
Three
One
Two

Solution :EDTA is a hexadentate LIGAND HENCE, onley one molecule is sufficient to make an octahedral COMPLEX with `CA^(2+)` ion.
Discussion
30.

How many EDTA molecules are required to make an octahedral complex with a Co^(2+) ion ?

Answer»

TWO
SIX
THREE
ONE

ANSWER :D
Discussion
31.

How many EDTA (ethylenediaminetetraacetic acid) molcules are required to make an octahedral complex with a Ca^(2+) ion?

Answer»

six
Three
One
Two

Solution :`[CA(EDTA)]^(2-)`
Discussion
32.

How many double bonds are present in the repeating structural units of polythene ?

Answer»


Solution :ZERO. The repeating STRUCTURAL unit of polythene is `-CH_2CH_(2)-` . It has no DOUBLE bond.
Discussion
33.

How many double bond are showing GI :-

Answer»

1
2
3
4

Answer :C
Discussion
34.

How many different tripeptide chains can be prepared by combining three amino acid A, B and C in different order ?

Answer»

6
4
3
8

Answer :A
Discussion
35.

How many different six carbon hydrocarbons on reductive ozonolysis give the same product shown below?

Answer»


SOLUTION :N//A
Discussion
36.

How many different ketones on treatment with Grignard's reagent followed by hydrolysis can give 2-cyclopentyle butanol ?

Answer»


ANSWER :3
Discussion
37.

How many different proteins containing 100 amino acids can be made from the 20 naturally occurring amino acids?

Answer»

`100^(20)`
`20^(100)`
100-20
None of these

Answer :B
Discussion
38.

How many different isomers exist for the octahedral complex [Co(NH_(3))_(4)Cl_(2)]^(+) ?

Answer»

1
2
3
4

Answer :B
Discussion
39.

How many different condensation products would be form by the given reaction? CH_(3)-overset(O)overset(||)(C )-OC_(2)H_(5)+CH_(2)-overset(O)overset(||)(C )-OC_(2)H_(5) overset(C_(2)H_(5)overset(-)(O)overset(+)(N)a)underset(C_(2)H_(5)OH)rarr

Answer»


ANSWER :4
Discussion
40.

How many different condensation products would be formed by above reaction?

Answer»


ANSWER :D
Discussion
41.

How many different carboxylic acids are obtained when all the isomeric arenes having the molecular formula C_(8)H_(10) are oxidised with alk. KMnO_(4) followed by acidification?

Answer»


SOLUTION :FOUR ISOMERIC carboxylic acids are formed from four different arenes: ETHYLBENZENE `to` benzoic acid, o-xylene `to` phthalic acid, m-xylene`to`isophthalic acid and p-xylene`to`terephthalic acid.
Discussion
42.

How many different codons are possible?

Answer»

16
32
48
64

Solution :64 DIFFERENT CODONS are POSSIBLE.
Discussion
43.

How many differentacyclicisomers of C_(6)H_(12)onhydrogenationwithH_(2)//Ni givethesame 3- methylpentane ?

Answer»


ANSWER :5
Discussion
44.

How many differentacyclicisomers of C_(5)H_(8) on catalytichydrogenation give the samen- pentane ?

Answer»


ANSWER :8
Discussion
45.

How many dichlorodiphenyl with molecular formula C_12H_8Cl_2 of each bezene ring containing only one (-Cl) group are possible :

Answer»


ANSWER :6
Discussion
46.

How many dichloro products (including stereoisomers) will be formed when R-2- chloropentane reacts with Cl_(2) in presence is UV radiation?

Answer»


ANSWER :7
Discussion
47.

How many defects exists in the arrangement of constituent particles of 7.45 g KCl ? [K = 39, Cl = 35.5 g/mole]

Answer»

`10 xx 10^(23)`
`1 xx 10^6`
`1.0 xx 10^(-6)`
`10 xx 10^4`

SOLUTION :NUMBER of moles of KCL `= (7 : 45)/(74.5) = 0.1`
1 mol KCl = `10^6` Schottky pairs
`therefore` 0.1 mol KCl = `10^5` Schottky pairs
Discussion
48.

How many d pi - p pi bonds are present in gamma-SO_(3)?

Answer»


Solution :`GAMMA` - FORM is cyclic TRIMER.

Out of `12pi` bonds 8 are `d PI-p pi` bonds.
Discussion
49.

How many cyclic isomers of molecular formulaC_(7)H_(15) can form 1 methylcyclohexan-l-olon reaction with H_(2)O /acetone/ Ag‘ {consider only structural isomers)?

Answer»


SOLUTION :
Discussion
50.

How many 'd' electrons are present in Cr^(2+) ion?

Answer»

4
5
6
3

Answer :A
Discussion