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 statement about metal carbonyl complex compounds :

Answer»

Metal carbon bond in metal carbonyls possess both `sigma" and "Pi` characters
Due to synergic bonding metal carbon bond becomes weak
Due to synergic bonding carbon oxygen bond STRENGTH decreases
In metal carbonyls, EXTENT of synergic bonding will INCREASE with increase in NEGATIVE charge on central metal ion

Solution :Synergic bonding strengthens the M-C bond
Discussion
2.

Select the incorrect statement about silicate's :-

Answer»

Beryl an EXAMPLE of cyclic silicate
In PYROSILICATE, only one oxygen ATOM shared
FORMULA of single chain silicate is `(Si_(2) O_(5) )_(n)^(-2n)`
In single chain silicate two oxygen atom are shared

Answer :C
Discussion
3.

Select the INCORRECT statement about inert gases.

Answer»

The ionization enthalpy of each INERT gas is the HIGHEST in its period.
Inert gases have LARGE negative values of electron gain enthalpy.
The atomic radii of inert gases are larger than those of halogens.
All the inert gases are MONATOMIC in nature.

Answer :B
Discussion
4.

Select the incorrect statement about hydrides of group 15 elements.

Answer»

The CENTRAL atom in the hydride is `SP^(2)`-hybridised
`NH_(3)` readily from `NH_(4)^(+)` salts with `H^(+),PH_(4)^(+)` salts are formed with `H^(+)` under anhydrous condition
The tetrahedron is distorted due to repulsion between the lone pair of electrons and the bond pairs
The bond energy of the M-H bond decreases from `NH_(3)` to `BiH_(3)`, because of increase in the size of the element.

Answer :A
Discussion
5.

Select the incorrect statement about cathode rays.

Answer»

Deflected by ELECTRIC and MAGNETIC field
Stream of electron
Move with same SPEED as that of light
Travel in PARABOLIC path

Answer :D
Discussion
6.

Select the incorrect statement about beryllium and aluminium?

Answer»

Chlorides of BERYLLIUM and aluminium are soluble in organic solvents
Beryllium and aluminium HYDROXIDES are soluble in excess of alkali
Chlorides of beryllium and aluminium are strong lewis acids
Aluminium and beryllium readily REACT with mineral acid to give HYDROGEN gas

Answer :D
Discussion
7.

Select the incorrect statement about (A) and ( C) compounds.

Answer»

Aqueous solution of (C ) PRODUCES white PRECIPITATE with dilute HCl (2M)
Aqueous solution of (A ) gives black white precipitate with `H_2S` gas and dilute HCl
Aqueous solution of (C ) produces red precipitate with `K_2CrO_4` solution
Aqueous solution of (A ) developsdeep blue COLOURATION with excess `NH_3` solution

Solution :`Pb^(2+)+CrO_4^(2-)toPbCrO_4 darr` (yellow)
Discussion
8.

Select the incorrect statement:

Answer»

Schottky defect is shown by CSCL
Frenkel defect is shown by ZnS
Hexagonal close PACKING (HCP) & cubicclose pack- ing (ccp) structure has same co-ordination no. of 12
At high pressure, the co-ordination number de- creases.

Answer :D
Discussion
9.

Select the incorrect statement.

Answer»

HGO gives oxygen on heating.
Solid `PCl_5`have tetrahedral and octahedral unit
M.P. of NACL gt LICL but reverse order is true for their THERMAL stability
`LiHCO_3` and `KHCO_3` both are found in solid state.

ANSWER :D
Discussion
10.

Select the incorrect property for Fe_(4)[Fe(CN)_(6)]_(3) complex

Answer»

<P>`d^(2)sp^(3)` Hybridisation of coordinated FE atom
Blue colour DUE to ligend to metal charge transfer
Six electrons are present in `t_(2g)` ORBITAL
Less bond length of `(C-N)` than in `Fe[Fe(CN)_(6)]`

Solution :`10.2=W+KE_("max"),1`
`10.2Z^(2)=w+KE_("max")2`
`lambda_(DB)=(h)/(p)=(h)/(sqrt(2m(K in))),(lambda_(1))/(lambda_(2))=sqrt((Kin_(2))/(K_(in_(1))))=2.3`
`KE_(2)=5.25KE_(1)`
`10.2z^(2)=3xx 13.6,z=2 " "&" " w=3eV`
Discussion
11.

Select the incorrect statement ?

Answer»

`Ag^(+)` ions with an excess of a solution containing `CN^(-)` ions form a complex having coordination number two.
`PtCl_(3)(n^(2)-C_(2)H_(4))`, an organometallic compound is `SIGMA` and `pi` bonded.
Vitamin `B_(12)` is a coordination compound of cobalt.
`RhCl(PPh_(3))_(3)`, a Wilkinson catalyst has `sp^(3)` hybridisation and is used for the hydrogenation of alkenes.

Solution :`[Rh(I)Cl(PPh_(3))_(3)]` has `4D^(8)`CONFIGURATION. This configuration compels for the PAIRING of electrons LEADING to one orbital vacant for `dsp^(2)` hybridisation on amount of higher CFSE . It is square planar and diamagnetic.
Discussion
12.

Select the incorrect reduction process.

Answer»

`2[Ag(CN)_(2)]^(-) +Zn to [Zn(CN)_(4)]^(2-)+2Ag `
`CuO+H_(2) to Cu+H_(2)O`
`ZnO+H_(2) to Zn +H_(2)O`
`MgO+C to Mg +CO`

SOLUTION :It is not POSSIBLE for a less reactive elementto reduce a more reactiveelement . Zn is moderately reactive metal and is more reactive as compared to hydrogen .
Thus , hydrogen hasno ability to reduce `Zn^(2+)` to Zn. Cu being less reactive is reduced by hydrogen .
Hence reaction 'c' is not possible .
Discussion
13.

Select the incorrect orders from the following .

Answer»

`CIO^(-) LT BrO^(-) lt IO^(-)` - disproportionation
`CIO_4^(-) lt BrO_4^(-) lt IO_4^(-)` - oxidising power
`HCIO lt HCIO_2 lt HCIO_3 lt HCIO_4` - acid strength
HOCl gt HOI gt HOBr -acid strength

Solution :(B)`CIO_4^(-) lt IO_4^(-) lt BrO_4^(-)` according to their reduction potential
(D)HOCI gt HOBr gt HOI. As ELECTRONEGATIVITY of halogens increases the acidic character increases GIVEN (B) and (D) are correct order .
Discussion
14.

Select the incorrect match:

Answer»

`[Co(NO_(2))(H_(20O)(en)_(2)]Cl_(2),[CoCl(NO_(2))(en)_(2)]Cl*H_(2)O`: HYDRATE isomerism
`[Cu(NH_(3))_(4)][PtCl_(4)],[CuCl(NH_(3))_(3)][}tCl_(3)(NH_(3))]`: Co-ordinatino isomersm
`[Ni(CN)(H_(2)O)(NH_(3))_(4)]Cl,[NiCl(H_(2)O)(NH_(3))_(4)]CN`: IONIZATION isomerism
`[Cr(NO_(2))(NH_(3))_(5)][ZnCl_(4)],[Cr(NO_(3))(NH_(3))_(5)][ZnCl_(4)]`: LINKAGE isomerism

Solution :`NO_(3)^(-)` ion NEVER acts as abidentate ligand.
Discussion
15.

Select the given code of reagents for following canversion and write your answer as abcd. If reagentis used once then you need not to take again. (1) H_(2)So_(4)(2) ZnHg//HCl (3) NHO_(3)//NH_(3)So_(4)(4)NaNO_(2)//HCl0^(@)-5^(@)C (5) NaH_(4)//H_(2)O_(2)(6) NBS (7) Me-overset(O)overset(||)C-Cl//AlCl_(3)(8) Me_(3)CO^(Θ)Na^(o+)

Answer»


SOLUTION :N//A
Discussion
16.

Select the given code of reagents for following conversion and write your answer as abcd. If reagent is used once then you need not to take it again.

Answer»


SOLUTION :N//A
Discussion
17.

Select the group of oxides that can not be reduced by carbon to give the respective matals.

Answer»

`CaO,K_(2)O`
`Fe_(2)O_(3),ZnO`
`Cu_(2)O,SnO_(2)`
`Fe_(2)O_(3),PBP.`

ANSWER :A
Discussion
18.

Select the flow diagram which is correct for extraction of particular metal from its ore :-

Answer»

`"Tin stone" overset("Magnetic")overset("separation")to SnO_(2)overset("Self")overset("reduction")tounderset(SN("pure"))underset(""darr"distillation")(Sn("impure"))`
`"Red Bauxite" overset("Serpeck.s")overset("process")to Al_(2)O_(3)overset("Electrolytic")overset("reduction")tounderset(""Al("pure"))underset(underset("refining")("Electrolytic")darr)(""Al("impure"))`
`"GALENA" overset("Forth")overset("Floatation")to PbSoverset({:("Partial"),("roasting"):})underset({:("+Self"),("rduction"):})tounderset(""Pb("pure"))underset(underset("refining")("Electrolytic")darr)(""Pb("impure"))`
`"Haematite" overset("Leaching by")overset("NaOH")to Fe_(2)O_(3)overset("Carbon")overset("reduction")tounderset(""FE("pure"))underset(underset("refining")("Electrolytic")darr)(""Fe("impure"))`

ANSWER :C
Discussion
19.

Select the example of desproportionatonreaction

Answer»

`BaCl_(2)+H_(2)SO_(4)rarrBaSO_(4)+2HCL`
`NH_(4)NO_(3)rarrN_(2)O+2H_(2)O`
`4H_(3)PO_(3)rarrPH_(3)+3H_(3)PO_(4)`
`AgCl+2NH_(3)rarrAg(NH_(3))_(2)Cl`

ANSWER :C
Discussion
20.

Select the ether among following that yields methanol as one of the products on reaction with cold hydroiodic acid

Answer»

1-Methoxybutane
1-Methoxy-2-methylpropane
2-Methoxy-2-methylpropane
METHOXYBENZENE

ANSWER :C
Discussion
21.

select the cottect IUPAC name of [Co(H_(2)NCH_(2)CH_(2)NH_(2))_(3)]_(2)(SO_(4))_(3) is :

Answer»

TRIS (ethane-1, 2-diamine) cobalt (III) sulphate
Tris (ethane-1, 2-diamine) cobaltate (III) sulphate
Tris (ethane-1, 2-diamine) cobaltate (II) sulphate
None of the above

Solution :N//A
Discussion
22.

Select the diamagnetic complex ion amongst the following complexes (At.no : Fe = 26 , CO = 27)

Answer»

`K_(3)[FE(CN)_(6)]`
`[Co(NH_(3))_(6)]Cl_(3)`
`K_(3)[FeF_(6)]`
`K_(3)[CoF_(6)]`

Solution :Coordination compound /ion having unpaired ELECTRON is paramagnetic in nature while if it has all the electrons paired , it is diamagnetic .
(a) `K_(3) [Fe (CN)_(6)] i.e. , [Fe(CN)_(6)]^(3-) `ion
`""_(26)Fe = [Ar] 3d^(6) 4s^(2) implies Fe^(3+) = [Ar] 3d^(5) , 4s^(0)`

(b) `[Co(NH_(3))_(6)]Cl_(3)` i.e, `[Co(NH_(3))_(6)]^(3+)` ion
`""_(27)Co = [Ar] 3d^(3) 4s^(2) implies Co^(3+) = [Ar] 3d^(6) 4s^(0)`

(c) `K_(3) [Fe F_(6)] i.e., FeF_(6)^(3-)` ion
`""_(26)Fe = [Ar] 3d^(6) 4s^(2) implies Fe^(3+) = [Ar] 3d^(5) 4s^(0)`

(d) `K_(3) [CoF_(6)]i.e., CoF_(6)^(3-) `ion
`""_(27)Co = [Ar] 3d^(7) 4s^(2) implies Co^(3+) = [Ar] 3d^(6)`

Therefore `, [Co(NH_(3))_(6)] CF_(3)` diamagnetic in nature .
Discussion
23.

Select the element which does not form double bond

Answer»

Nitrogen
Sulphur
SILICON
Phosphorus

Solution :Silicon does not form double bond with itself or with oxygen thus Si-O bonds are MUCH STRONGER than Si-Si and Si-H bond silicon has vacant 3d - ORBITALS in it valence shell due to which it can extand its covalency from FOUR to five and six.
Discussion
24.

Select the correct statements(s):

Answer»

At Boyle's TEMPERATURE a real gas behaves like an IDEAL gas at low pressure
Above critical conditions, a real behave like an ideal gas
For HYDROGEN gas 'b' dominates over 'a' all at temperature
At high pressure van der Waals' constatn 'b' DOMINATED over 'a'

Solution :N//A
Discussion
25.

Select the correct synthesis products

Answer»




SOLUTION :`-` Electrophilic addition reaction, oxidation & SN-Rxn
`AtoHBO`
`BTO` Oxymeruration Demercuration
`Cto` Epoxidation
`DtoSN`- Reaction of AROMATIC compound.

Discussion
26.

Select the correct statements(s)

Answer»

when `Tto prop` or `E_(a)to0`, then K=A
A positive catalyst can change `DeltaH` of the reaction
A mixture of REACTANTS may be thermodynamically unstable but KINETICALLY stable.
A NEGATIVE catalyst increases the activation energy of the reaction.

Solution :`K=A.E^(-E_(a)//RT)`
Discussion
27.

Select the correct statement(s) with respect to the p pi-dpi dative bond.

Answer»

In `(Ph_3Si)_2O`, the Si-O-Si group is nearly linear
Silanols such as `(CH_3)_3` SiOH are stronger protonic acids then their carbon analogs
Trisilysl phosphine `(H_3Si)_3` P is planar
`CIO_4^-` does not polymerise at all

Solution :(A)Steric repulsions of bulkier groups and `ppi-DPI` dative bonding FAVOUR for a linear Si-O-Si group.
(B)Due to stabilization of the conjugate base anion by O `(ppi)to Si(dpi)`bonding MOTION.
( C)In is PYRAMIDAL because `ppi-dpi` bonding is not effective due to the bigger size of phosphorus atom
(D)Most effective due to small size of chlorine.
Discussion
28.

Select the correct statement(s) related to hexagonal close packing of identical spheres in three dimensions :

Answer»

In ONE unit cell there are 12 octahedral voids and all are COMPLETELY INSIDE the unit cell.
In one unit cell there are six octahedral voids and all are completely inside the unit cell
In one unit cell there are six octahedral void and of which three are completely inside the unit cell and other three are partially inside the unit cell
Co-ordination number of EVERY sphere is 12 in hcp lattice.

Solution :hcp=AB AB AB… pattern repeat
For calculating voids between two layers A and B
Octahedral voids=3=represented by (*).
So total octahedral voids=6= All are completely inside.
Discussion
29.

Select the correct statement(s) regardingthe compounds (W) and (Z)

Answer»

COORDINATION number of Al in the COMPOUND (W) is 6
Coordination number of Ga in the compound (Z) is 4
The compound (Z) EXISTS as dimer
All of the above

Answer :D
Discussion
30.

Select the correct statement(s) regarding BF_(2)NH_(2) molecule:

Answer»

FBF bond angle `lt120^(@)`
HNH bond angle `gt109^(@)28'`
HNH bond angle `lt109^(@)28'`
FBF bond angle `gt120^(@)`

Solution :
`2p_(pi)-2p_(pi)` back bonding
According to Bent.s rule there is more p-character in `B-F` bond than in `B-N` bond, Hence FBF is less than `120^(@)`.
As size of `-NH_(2)` group is larger than F-atom hence repulsion between `-NH_(2)` group and F-atom is higher than between two F-atoms.
As LONE pair of N-atom in `NH_(2)` group participate in back bonding hence `H-N-H` is greater than `109^(@)28.`. as hybridization of N is changing from `sp^(3)` towards close to `sp^(2)`
Discussion
31.

Select the correct statements regarding [Pt(en)(pn)Cl_(2)]^(2+) ion.

Answer»

It exhibits optical isomerism
It exhibits geometrical isomerism.
All isomers are optically active
It is DIAMAGNETIC in nature

Solution :`[Pt(en)(pn)Cl_(2)]^(2+) : Pt^(4+) : 5D^(6) : d^(2)sp^(3)` (unpaired ELECTRONS are zero)

and both geometrical isomers are optically active.
Discussion
32.

Select the correct statements of the following:- (a) Effective nuclear charge for nitrogen is 3.90 (b) IP of Ne is more than Na^(+) (c ) Order of electronegativity- sp gt sp^(2) gt sp^(3) (d) Order of acidic character- NH_(3) lt PH_(3) lt AsH_(3)

Answer»

a, B, d
b, C
a, c, d
a, b, c, d

ANSWER :C
Discussion
33.

Select the correct statements : I. Cs^(+) is more highly hydrated that the other alkali metal ions. II. Among the alkali metals. Li, Na, K and Rb, lithium has the highest melting point. III. Among the alkali metals only lithium froms a stable nitride by direct combination with nitrogen.

Answer»

I, II and III
I and II
I and III
II and III

Solution :AMONGST alkali METAL Li ions are highly HYDRATED.
Discussion
34.

Select the correctstatements . (i) Physical adsorption is weak, multilayer, non-directional and non-specific. (ii) Chemical adsorption is strong, unilayer, directional and strong (iii) Chemical adsorption decreases with temperature (iv) Chemical adsorption is more stronger than physical adsorption

Answer»

(i) and (III) only
(i), (II) and (IV) only
(iii) only
All of these.

Solution :Chemisorption first increases with temperature as it REQUIRES energy of activation.
Discussion
35.

Select the correct statements from the following

Answer»

A-methoxy PHENOL is more reactive tha P-nitro phenol towards Reimer-Tiemann reaction.
Phenol GIVES ortho isomer PREDOMINANTLY than para isomer in Reimer-Tiemann reaction.
The ELECTROPHILE involved in R.T.R is `Cl^(+)`.
Para cresol is less reactive than phenol in R.T.R.

Answer :A,B
Discussion
36.

Select the correct statement(s) for the compound K_(2)[Cr(NO^(+))(NH_(3))(CN)_(4)]

Answer»

Its IUPAC name is potassium amminetetracyanidonitrosoniumchromate (I)
Its spin only magnetic moment is `sqrt(8BM)`
Its hybridisation is `d^(2)sp^(3)`
It show geometrical isomerism

Solution :TUPAC name of `K_(2)[Cr(NO^(+))(NH_(3))(CN)_(4)` is potassium amino tetracyanonitrosonium chromate (I)
`mu=sqrt(5(5+2))BM"":.5` unpaired ELEMENTS present.
`=sqrt(35)BM` and can GIVE
SFL are present `[Ma_(4)bx]^(2+)` inner orbital octahedron complex hybridisation of Cr is `d^(2)sp^(3)`.
It is of type `[Ma_(4)bx]^(2+)` type and shows geometrical isomerism.
Discussion
37.

Select the correct statements for the following decay chain A overset(-alpha)(to) B overset(-beta)(to) C overset(-beta)(to) D

Answer»

A and D are isotopes
B , C and D are isobars
A and B are ISODIAPHERS
A and C are isotones

SOLUTION :Isotopes = same .Z., Isobars = same .A. Isodiaphers = same (A - 2Z)
Discussion
38.

Select the correct statements : CaCl_(2) doped with NaCl solid solution results in

Answer»

substitutional CATION vacancy
Frenkel's defect
Schottky defect
DECREASE of density

Answer :A::D
Discussion
39.

Select the correct statement(s) for positron emission by unstable nucleus.

Answer»

X-ray EMISSION takes place
a neutron is FORMED
`(N)/(p)` of daughter NUCLEUS increases
A neutron is consumed

Answer :B::C
Discussion
40.

Select the correct statement(s) for (NH_(4))_(3)PO_(4)

Answer»

Ratio of number of oxygen atoms to number of HYDROGEN atoms is 1:3
Ratio of number of cations to number of anions is 3:1
Ratio of number of gm-atoms of nitrogen to gm-atoms of oxygen is 3:2
Total number of atoms in ONE mole of `(MH_(4))_(3)PO_(4)` is 20.

Answer :A::B
Discussion
41.

Select the correct statements among the following

Answer»

Greater the HUMIDITY, lesser will be the RATE of evaporation
Greater is the humidity, lesser will be the density of air
If room temperature = dew point, relative humidity = 100%
Dew point is the TEMP at which the gas at given atmospheric condition becomes saturated with WATER vapour

Answer :A::B::C::D
Discussion
42.

Select the correct statements among the following:

Answer»

The DECAY of mass during nuclear fusion and nuclear fission are 0.1% and 0.231% respectively.
Lesser is the HALF life, more dangerous is the RADIOACTIVE element.
K-electron capture EMITS `gamma`-rays
Nuclear forces are about `10^(21)` times stronger than coulombic forces.

Answer :a,b,d
Discussion
43.

Select the correct statements among the following.

Answer»

Co (III) is stabilised in presence of weak field ligands, while Co (II) is stabilised in presence of strong field ligabd,
FOUR coordinated complexes of Pd(II) and Pt(II) are paramagnetic and square planar.
`[NI(CN)_(4)]^(4-)` ion and `[CI(CO)_(4)]` are tetrahedral and square planar respectively.
`Ni^(2+)` ion does not form inner orbital octahedral complexes in presence of weak ligand fields.

Answer :D
Discussion
44.

Select the correct statement(s) among following

Answer»

Increase in concentration of reactant increases the rate of a zero order reaction
Rate constant k is EQUAL to collision frequency Aif `E_(a)=0`
Rate constant k is equal to collision frequency A if `E_(a)=oo`
`log_(10)` k VS 1/T is a STRAIGHT line

Solution :`K=A.C^(-Ea//RT)`
Discussion
45.

Select the correct statement(s) about the complex, [Pt(S_(5))_(3)]^(2-).

Answer»

It contians `S_(5)^(2-)` anion which is a chelating ligand.
Its GEOMETRY is octahedral.
Hybridisation of pt is `d^(2)SP^(3)`.
The complex ion is chiral.

Solution :
Discussion
46.

Select the correct statement(s) about the compound NO[BF_4]

Answer»

It has `5sigma and 2pi` bonds
NITROGEN - OXYGEN BOND length is higher than in nitric oxide (NO)
It is a diamagnetic SPECIS
B - F bond length in this compound in LOWER than in `BF_3`

Solution :
Discussion
47.

Select the correct statements about oxygen molecule.

Answer»

It is PARAMAGNETIC.
Its bond ORDER is TWO
In liquid STATE it is blue COLOURED.
It has two unpaired electrons.

Answer :A::B::C::D
Discussion
48.

Select the correct statements about Ma_(2)bcde

Answer»

It has 6 cis GEOMETRICAL isomers with RESPECT to two a
It has 3 trans isomers with respect to two a
It has 15 steroisomers
It has 12 optically ACTIVE and 3 optically inactive isomers

Solution :
(b)
(C ) Stereo`implies 12+3=15`
Discussion
49.

Select the correct statement(s) about climetidine andrantitidine.

Answer»

These are ANTIHISTAMINE drugs
These prevent the excess PRODUCTION of HCl in the STOMACH
Both prevent the interaction between histamineand RECEPTOR of stomach wall
All of the above are CORRECT statements

Answer :D
Discussion
50.

What are the main ingredients of Portland cement :-

Answer»
Discussion