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.

Out of the following two coordination entities, which is chiral (optically active) ? (a) cis-[CrCl_(2)(o x)_(2)]^(3-)(b) trans-[CrCl_(2)(o x)_(2)]^(3-)

Answer»

SOLUTION :
Discussion
2.

Out of the following which are soluble in-water:(i) AgCN (ii)Ag_2S (iii) AgF (iv)AgNO_3 (v)AgClO_4.

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(i) (ii) (iii)
(iii) (IV) (v)
(i) (v) (ii)
(ii) (iii) (i)

Answer :B
Discussion
3.

Out of the following transition elements, the maximum number of oxidation states are shown by

Answer»

`SC (Z=21)`
`CR(Z=24)`
`MN(Z=25)`
`FE(Z=26)`

SOLUTION :`Mn(Z=25)`
Discussion
4.

Out of the following three solutions, which has the highest freezing point and why? (i) 0.1 M Urea (ii) 0.1 M Barium phosphate (iii) 0.1 M Sodium sulphate

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ANSWER :0.1 M UREA
Discussion
5.

Out of the following three solutions, which has the highest boiling point and why? (i) 1 M Glucose (ii)1 M Potassium chloride (iii) 1 M Aluminium nitrate

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SOLUTION :`"1 M AL"(NO_(3))_(3)`
Discussion
6.

Out of the following, the strongest base in aqueous solution is

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METHYLAMINE
DIMETHYLAMINE
TRIMETHYLAMINE
ANILINE

SOLUTION :Dimethylamine
Discussion
7.

Out of the following the one which is not a primary standard is

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`K_(2)Cr_(2)O_(7)`
`KMnO_(4)`
OXALIC acid
Ceric sulphate

Answer :B
Discussion
8.

Out of the following the number of metals that can not be obtained by electrolysis of the aqueous solution of their sals are Ag,Mg,Cu,Al,Au,Ca,Na

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SOLUTION :`MG,CL,CA,NA`
Discussion
9.

out of the following the correct statement(s) is/are (a) Number of subshells present in M-shell is equal to 3, (b) maximum number of electrons present in l shell is equal to 8, (c) number of electron present in subshell is 3(2l + 1), (d) Cu^+ is paramagnetic

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(a),(B) &(C)
(b) & (d)
(a)&(b)
(a), (b), (c) & (d)

ANSWER :C
Discussion
10.

Out of the following the metal which forms polynuclear carbonyl is:

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Na
Mg
Mn
All

Answer :C
Discussion
11.

Out of the followingwhich metal forms polynuclear carbonyl :

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Na
Mg
Mn
All

Answer :C
Discussion
12.

Out of the following, the alkene that exhibits optical isomerism is:

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2-methyl-2-pentene
3-methyl-2-pentene
4-methyl-1-1-pentene
3-methyl-1-pentene

ANSWER :D
Discussion
13.

Out of the following the best category of proteins is

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polyamides
Polythioethers
Glycerides
Polysaccharides

Answer :A
Discussion
14.

Out of the following solutions which has the maximum freezing point and why ? (i) 1 M urea (ii) 1 M potassium chloride (iii) 1 M aluminium chloride

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SOLUTION :1 M UREA solution.
Discussion
15.

Out of the following the alken that exhibits optical isomerism is:

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2-Methylpent-2-ene
3-Methylpent-2-ene
4-Methylpent-1-ene
3-Methylpent-1-ene.

Solution :
Discussion
16.

Out of the following the alkene that exhibits optical isomerism is :

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3-methyl-1-pentene
2-methyl-2-pentene
3-methyl-2-pentene
4-methyl-1-pentene

Solution :`underset("3-Methyl-pent-1-ene")(H_(3)C - CH_(2) - underset(CH_(3))underset(|)(CH) - CH = CH_(2))`
is OPTICALLY active because of chiral C.
Discussion
17.

Out of the following pairs (of complexes), in which option, first complex is more stable than second complex :

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`[CO(NO_(2))_(6)]^(4-)" and "[Co(NO_(2))_(6)]^(3-)`
`[Co(H_(2)O)_(6)]^(2+)" and "[Co(NH_(3))_(6)]^(2+)`
`[Co(TRIEN)]^(2+)" and "[Co(en)_(2)]^(2+)`
`[Mn(NH_(3))_(6)]^(2+)" and "[Ni(NH_(3))_(6)]^(2+)`

Solution :`[Ci(trien)]^(2+)` has BETTER chelation.
Discussion
18.

Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals.

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(i) `n = 3, I= 2, m_(L) = -2, m_(s)=-1/2`
(ii)`n=3,l=2,m_(l)=1,m_(s)=-1/2`
(i) `n = 3, I= 1, m_(l) = 1, m_(s)=+1/2`
(ii)`n=3,l=2,m_(l)=2,m_(s)=+1/2`
(i) `n = 4, I= 1, m_(l) = 1, m_(s)=+1/2`
(ii)`n=3,l=2,m_(l)=-2,m_(s)=+1/2`
(i) `n = 3, I= 2, m_(l) = +2, m_(s)=-1/2`
(ii)`n=3,l=2,m_(l)=+2,m_(s)==1/2`

SOLUTION :The orbitals of same energy are CALLED degenerate orbitals.

`3d_(xy))` and `3d_(yz),3d_(x^(2)-y^(2))` represent PAIR of degenerate orbitals.
Discussion
19.

Out of the following oxides of nitrogen how many of them are neutral oxides? N_(2)O, NO, N_(2)O_(3), NO_(2),N_(2)O_(4), N_(2)O_(5)

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2
3
5
5

Solution :`N_(2)O & NO`
Discussion
20.

Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one?

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`(n-1)d^(8)ns^(2)`
`(n-1)d^(5)ns^(2)`
`(n-1)d^(3)ns^(2)`
`(n-1)d^(5)ns^(1)`

Solution :`(n-1)d^(5)ns^(2)` can give `+7` OXIDATION state.
Discussion
21.

Out of the following metals that cannot be obtained by electrolysis of the aqueous solution of their salts is

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Ag
Cr
Cu and Al
MG

Solution :SINCE the reduction POTENTIAL of `Mg^(2+)(-2.37V)` is much lower than that of `H_(2)O(-0.83V)`, therefore `H_(2)O` GETS reduced in preference of `Mg^(2+)` IONS.
Discussion
22.

Out of the following identify (i) the *d' block element (ii) the of block element. Ca,Mn,U,Al

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SOLUTION :(i) MN (II) U
Discussion
23.

Out of the following, how many oxides are acidic. MnO, Mn_(2)O_(3), MnO_(2), MnO_(3), Mn_(2)O_(7).

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Solution :LOWER O.S. compounds are basic and higher O.S. compounds are acidic.
`UNDERSET("netural")OVERSET(+2)(MnO, Mn_(2)O_(3)), underset("Acidic")(MnO_(2)^(+4), MnO_(3)^(+6), Mn_(2)O_(7)^(+7))`
Discussion
24.

Out of the following, hydrophobicsol is:

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GUM
STARCH
GELATIN
SULFURE

SOLUTION :sulfure
Discussion
25.

Out of the following gases which will be adsorbed more readily on the surface of charcoal : NH_3 gt CO_2 gt O_2

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SOLUTION :The order of CRITICAL temperature for the GIVEN GASES is `NH_3 GT CO_2 gt O_2`
Hence `NH_3` has strongest intermolecular forces of attraction and hence will be adsorbed more readily.
Discussion
26.

Out of the following fractions of petroleum, the one having the lowest boiling point is

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KEROSENE
DIESEL oil
Gasoline
Heavy oil

Answer :C
Discussion
27.

Out of the following elements,which one is the most reactive chemically?

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Ba
Sr
Ca
Mg

Answer :A
Discussion
28.

Out of the following compounds, which will be dehydrated most readily?

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Solution :The dehydration can take place in the acidic medium in the presence of conc. `H_(2)SO_(4)` . A carbocation us EXPECTED to be formed in each case as the intermediate in the rate dertermining step.

In the structures (A) and (B) the positively charged carbon atom is adjacent to the electron withrawing carbonyl group which tends to destabilise the carboncations by incresing the magnitude of the positive charge on these. HOWEVER, in carbocation (C), the carbonyl group is not directly ATTACHED to the positively charged carbon atom. THEREFORE, its positive charge weakning effect is comparactively is more stable. This mean that the compound (C) will be dehydrated most easily.
Discussion
29.

Out of the following four compounds, which is expected to show optical activity. {:(""R''),("|"),(R-overset(..)(N)-HR-overset(..)(N)-R'", "R-overset(..)(N)-R' R-N-R),("||||"),(""H""H""R''""R''),("(I)(II)(III)(IV)"):}

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Only III
Only IV
Both (III) and (IV)
None of these.

Solution :Quaternary ammonium salts with FOUR different groups ATTACHED to nitrogen atom show optical activity. This is because the UNSHARED PAIR of electrons no nitrogen gets bonded and as a result the salt exist as two ENANTIOMERIC forms
Discussion
30.

Out of the following elements which one do you expect to be most reactive chemically

Answer»

Mg
Ca
Sr
Ba

Solution :REACTIVITY of ALKALINE EARTH METALS increases down the group.
Discussion
31.

Out of the following compounds the most acidic is

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`As_(2)O_(3)`
`P_(2)O_(3)`
`Sb_(2)O_(3)`
`Bi_(2)O_(3)`

SOLUTION :`P_(2)O_(3)` is most acidic because ELECTRONEGATIVITY decrease in the order P gt As GTSB gtBi.
Discussion
32.

Out of the following, choose the one which is not a part of internal energy?

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KINETIC energy
potential energy
chemical BOND energy
gravitational energy

Answer :D
Discussion
33.

Out of the following compounds, which is the most basic ?

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`CH_(3)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`
`C_(6)H_(5)NH_(2)`.

Answer :B
Discussion
34.

Out of the following, choose a correct expression for finding out the cystal field stabilization energy in tetrahedral coordination entities.

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(## AAK_MCP_27_NEET_CHE_E27_030_A001 .PNG" WIDTH="30%">
(## AAK_MCP_27_NEET_CHE_E27_030_A002 .png" width="30%">
(## AAK_MCP_27_NEET_CHE_E27_030_A003 .png" width="30%">
(## AAK_MCP_27_NEET_CHE_E27_030_A004 .png" width="30%">

ANSWER :C
Discussion
35.

Out of the following, choose a correct statement.

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[Cu(NH_3)_6]^(2+)` is a colourless ION
[ZN(H_2O)_6]^(2+) `ion is blue coloured
[Ni(CO)_4] ` ion has a square planar SHAPE
If `[CoCl(NH_3)_5]^(2+)` absorbs yellow colour of light, then the colour of this coordination entity is violet.

Answer :D
Discussion
36.

Out of the following bond order of oxygen species identify the correct answer

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`O_2^(-)gtO_2gtO_2^+`
`O_2^(-)ltO_2ltO_2^+`
`O_2^(-)gtO_2ltO_2^+`
`O_2^(-)ltO_2gtO_2^+`

ANSWER :B
Discussion
37.

Out of the following 1.0 m aqueous solutions, which one will exhibit the largest point depression ?

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`C_(6)H_(12)O_(6)`
`AI_(2)(SO_(4))_(3)`
`K_(2)SO_(4)`
KCI.

Solution :`AI_(2)(SO_(4))_(3)` UPON dissociation in AQUEOUS solution GIVES maximum no. of ions (or particles). THEREFORE, it EXHIBITS the largest freezing point depression.
Discussion
38.

Out of the folloowing, the alkene that exhibits optical isomerism is

Answer»

3-methyl-1-pentene
2-methyl-2-pentene
3-methyl-2-pentene
4-methyl-1-pentene

Solution :`underset("3_methyl-1-pentene")(CH_(3)CH_(2)-overset(CH_(3))overset(|)(.^(**)C)H-CH=CH_(2))`
It has a chiral carbon and hence, it is optically active. All other ALKENES do not have a chiral carbon and hence are optically INACTIVE.
Discussion
39.

Out of the first 80 elements,the number of elements having 3d orbitals are:

Answer»

10
30
60
20

Solution :All ELEMENTS after SC(Z=21)have 3D ORBITALS.
Discussion
40.

Out of the compounds K_(2)SO_(4),MgCl_(2),FeSO_(4),NiCl_(2) and ZNO which of the following pair will show paramagnetism-

Answer»

`K_(2)SO_(4),MgCl_(2)`
`ZnO,MgCl_(2)`
`K_(2)SO_(4),ZnCl_(2)`
`FeSO_(4),NiCl_(2)`

SOLUTION :The pair which shows PARAMAGNETISM is `FeSO_(4)` and `Nicl_(2)`. It consist of `Fe^(+2)` and `Ni^(+2)` ions which have got UNPAIRED electrons. Their ELECTRONIC configs. Are as given below.
Discussion
41.

Out of the elements with atomic numbers given below which one would be a halogen:

Answer»

25
35
45
55

Answer :B
Discussion
42.

Out of the atomicnumbers given below suggest which one of the following will be a d-group element and name the element.

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12
13
18
25

Answer :D
Discussion
43.

Out of tetracarbonyl nickel (0) and tetraamminecopper (II) sulphate, which is magnetic and why ?

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SOLUTION :Tetraamminecopper (II) SULPHATE is paramagnetic whereas tetracarbonyl NICKEL (0) is diamagnetic.
Discussion
44.

Out of temperature and pressure, which does not affect the solubility of a solid in the solvent ?

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SOLUTION :PRESSURE
Discussion
45.

Out of t_(2g) and e_(g) orbitals, which have lower energy ?

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SOLUTION :`t_(2G)`
Discussion
46.

Out of sulphur and proteins, which one froms multimolecular colloids ?

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SOLUTION :SULPHUR
Discussion
47.

Out of sulphur sol and proteins, which one forms multimolecular colloids ?

Answer»

SOLUTION :SULPHUR FORMS MULTIMOLECULAR COLLOIDS.
Discussion
48.

Out of sulphur sol and proteins , which one forms macromolecular colloids?

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SOLUTION : PROTEINS FORM macromoleucular COLLOIDS .
Discussion
49.

Out of specific, equivalent and molar conductivities, the quantity which decreases with dilution is____.

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SOLUTION :SPECIFIC CONDUCTIVITY.
Discussion
50.

Out of sodium dichromate and potassium dichromate, which is more soluble ?

Answer»

SOLUTION :SODIUM DICHROMATE
Discussion