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.

In NaCl the CI^(-) ions occupy the space in :

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fcc
hcc
hcp
None of the above.

Answer :A
2.

In NaCl lattice structure if one of the sodium ion is removed from corner, the formula of the resulting compound is .....

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`Na_7Cl_(24)`
`NACL`
`NaCl_3`
`Na_3Cl_(11)`

Solution :Number of `NA^(+) ` ions = `(7 xx 1/8) = 7/8`
Number of `Cl^(-)` ions = `(6 xx 1/2) = 3`
`THEREFORE Na^(+) : Cl^(-) = 7/8 : 3 = 7 : 24`.
3.

In NaCl crystal, distance between Na^(+) and Cl^(-) is X pm, then edge length of unit cell = .......... pm.

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`2X`
`X/4`
`X/2`
`4X`

ANSWER :A
4.

In Na_(2)[Fe(CN)_(5)NO], sodium nitroprusside:

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oxidation STATE of FE is +2
this has `NO^(+)` as ligand
both are correct
none is correct

Answer :C
5.

In 'Na_2 O' structure

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`O^2-` IONS CONSTITUTE CCP and 'Na^+' ions occupy all the OCTAHEDRAL holes
O^2-' ions constitute CCP and 'Na^+' ions occupy all the TETRAHEDRAL holes
O^2-' ions constitute CCP and 'Na^+' ions occupy 50% of tetrahedral holes and 100% octahedral holes
`Na^+' ions constitute CCP and 'O^2-' ions occupy half of octahedral holes

Answer :B
6.

In N_2O_4 oxidation state of nitrogen is

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`-4`
`+4`
`-3`
`+3`

ANSWER :B
7.

In N_(2)O, the N - N distance corresponds to

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N = N
`N -= N`
N - N
Intermediate of N = N and `N-=N`

Solution :`N_2O:`
`N_2O` exists in above canonical - FORMS . So N - N BONDS `N_2O` is intermediate b/w N = N and `N-=N`.
8.

In multiplication and division the significant figures of answer must be same as that in the quantity with ……. number of significant figures

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maximum
3
2
minimum

Answer :D
9.

In N_2 +2H_2O rarr NH_4^+ +NO_2^-,Nis:

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Oxidised
Reduced
Both (a) and (B)
NONE of these

Answer :C
10.

In Mond's process following chemcial changes occurs: underset(("Impure"))(Ni)+CO overset(330-350K)(rarr)[P] [P] overset (450-470K)(rarr) underset(("Pure")) (Ni)+CO Coordination number of Ni in [P] is…...

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SOLUTION :NA
11.

In most close-packed lattices, ______ % of space is filled.

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SOLUTION :`74%` of SPACE is FILLED
12.

In molecules of the type AX_(2)I_(n) (where L represents lone pair and n is its number) there exists a bond between element A and X. The angle XAX bond angle

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ALWAYS DECREASE if N increase
Always increase if n increase
Will be maximum for n=3
generally decrease if n decrease

Answer :C
13.

Predict the percentage of space filled by particles in simple cubic lattice.

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SOLUTION :`74%` of SPACE is FILLED
14.

In molecular solids, the neutral molecules are held together by weak ………………

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SOLUTION :VANDER WAALS FORCE
15.

In moist air copper corrodesto produce a green layer on the surface. What is that layer ?

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Solution :Copper, in the presence of MOISTURE, oxygen and carbon dioxide ofatmosphere, is converted into a basic carbonate, called malachite of composition, `CuCO_(3). Cu(OH)_(2)`. Thisbasic carbonate is deposited as green layer on its SURFACE.
16.

In moist air copper corrodes to produce a green layer on the suface. Explain.

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Solution :In presence of moist air, a thin film of green basic copper carbonate is formed on its SURFACE and hence copper CORRODES.
`2Cu + O_(2) + H_(2)O + CO_(2) rarr underset("Green")(CuCO_(3).Cu(OH)_(2))`
17.

In modern process phosphorus is manufactured by:

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Heating a MIXTURE of PHOSPHORITE mineral with sand and coke in ELECTRIC furnace.
Heating calcium PHOSPHATE with coke
Heating bone ASH with coke
Heating the phosphate mineral with sand

Answer :A
18.

In modern periodic table,the basic character of oxides

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DECREASES from LEFT to right INCREASES from BOTTOM to TOP
Increases from left to right and decreases from top to bottom
Decreases from right to left and increases from top to bottom
Decreases from left to right and increases from top to bottom

Answer :D
19.

In modern periodic table, the position of the element with atomic number '84' is

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6TH GROUP, 6th period
IVA group, 6th period
16th group, 6th period
VIA group, 5TH period

Answer :C
20.

In Minamata Bay, Japan, which of the following animals remained tree from Minamata disease

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Dogs
Rabbits
Cats
Pigs

Answer :B
21.

In mixture A and 8 components show -ve deviation as

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`Delta V_(MIX) gt0`
`Delta H _(mix) LT 0`
A-B interaction is weakcr than A-A and B -B
A-B interaction is stronger than A-A and B-B intcration.

Solution :`[Delta H _(mix) lt 0]`
22.

In milk which acts as an emulsifier?

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Gelatin
Albumin
Casein
None of these

Answer :C
23.

In MgSO_(4) (At. Mass: Mg = 24, S = 32, O = 16), the mass percentage of

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MG = 80%
Mg = 20%
S= 26.7%
S = 53.3 %

Solution :MOLAR mass of `MgSO_(4) = 24 + 32 + 4 xx 16 = 120`
Mass % of Mg `=24/120 xx 100 = 20%`
Mass % of S `=32/100 xx 100 = 26.7%`
24.

In methanol, -OH group attached to carbon is ……………….. .

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SP hybridised ATOM
`sp^3` hybridised atom
`sp^2` hybridised atom
`dsp^2` hybridised atom

SOLUTION :`sp^3` hybridised atom
25.

In metropolitan cities like Mumbai and Calcutta, the major atmospheric pollutants are

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CARBON MONOXIDE and OXIDES of sulphur
Ozone
Hydrocarbons and hot air
POLLENS and marsh gas

Answer :A
26.

In metallurgy if iron, charge introduced in the blast furnace consists of __________.

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roasted ORE, SILICA and CALCIUM hydroxide
roasted ore, coke and calcium hydroxide
roasted ore , coke and calcium carbonate
roasted ore , coke and calcium silicate

Answer :C
27.

In metallurgy the metal used to displace silver from its cyano complex is

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Zn
Au
`F_(2)`
`Cl_(2)`

ANSWER :A
28.

In metallurgy of iron hot air is blown in blast furnacethrough _________ .

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an INLET
a tapping HOLE
tuyeres
an outlet

Solution :Tuyers -small nozzel-that MAKE BLAST in FURNACE
29.

In metallurgy, flux is a substance used to convert

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MINERAL into silicate
Fusible IMPURITIES to INFUSIBLE impurities
Infusible impurities to SOLUBLE impurities
Soluble impurities to infusible impurities

Answer :C
30.

In metallurgy , flux is a substance used to convert_________.

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INFUSIBLE IMPURITIES to FUSIBLE METERIAL
Soluable impurities to isoluble impurities
Fusible impurities to infusible impurities
MINERAL into silicate

Answer :A
31.

In metallurgy , flux is a substance used to convert :

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INFUSIBLE IMPURITIES to FUSIBLE mass
Mineral into silicate
Fusible impurities to infusible material
Soluble PARTICLES to INSOLUBLE impurities

Answer :A
32.

In metallurgy , carbon is important reducing agent, because for the formation of CO_(2)

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`DELTAS` is positive
`DeltaG^(@)` is +400 KJ/mole
`DeltaG^(@)` REMAINS CONSTANT at all temperature
`DeltaH` is +396 KJ/mole

Solution :Can be used even at HIGH temperature . E.g. 2000 K for SMELTING of iron ore.
33.

In metallurgical process, the flux used for removing acidic impurities is :

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SILLICA
SODIUM chloride
Limestone
Sodium carbonate

Answer :C
34.

In metallurgy, ane may be dissolved in water and the element may be displaced from solution using mother cheap element An E mple for this

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SOLUTION of CD + ZN metal<BR>Sea water CONTAINING `Br_(2)+Cl_(2)`
Solution of `Fe+Cu` metal
Solution of Zn+Ag metal

Solution :`Cd_((aq))^(+2)+Zn to Cd+ Zn^(+2), 2Br_((aq))^(-)+Cl_(2) 2Cl^(-)+Br_(2)`
35.

In metallurgical process of Al, cryolite is mixed in its molten state, because it

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decreases the AMOUNT of alumina
OXIDISES the alumina
increases the MELTING POINT of alumina
decreases the melting point of alumina

Answer :D
36.

In metallic conductor the current is conducted by flow of

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ions
atoms
electrons
molecules

37.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide.This leads to increase in strength of metal ligand bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which one of the following metal carbonyls involves the d^2sp^3 hybridisation for the formation of metal-carbon sigma bonds and is paramagnetic ?

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`[Cr(CO)_6]`
`[V(CO)_6]`
`[MO(CO)_6]`
`[W(CO)_6]`

Solution :
38.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide.This leads to increase in strength of metal ligand bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which amongst the following metal carbonyls are inner orbital complexes with diamagnetic property ? (I)Ni(CO)_4 , (II)Fe(CO)_5 , (III)V(CO)_6 , (IV)Cr(CO)_6 Select the correct answer from the codes given below :

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I and II only
II, III and IV only
II and IV only
I,II and IV only

Solution :The complex which uses (n-1)d orbital in the HYBRIDISATION is called as INNER orbital complex.
`Ni(CO)_4-sp^3`, diamagnetic
`Fe(CO)_5-dsp^3`, diamagnetic
`V(CO)_6-d^2sp^3` paramagnetic with one unpaired electron
`Cr(CO)_6-d^2sp^3`, diamagnetic
39.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide.This leads to increase in strength of metal ligand bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. In metal carbonyls, the increase in C-O bond length in CO as compared to carbon monoxideis due to :

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The donation of lone PAIR of electrons on the carbon into a vacant orbital of the metal atom
The donation of a pair of electrons from a filled d-orbitalof metal into the vacant antibonding `pi` orbital of carbon monoxide
(A) and (B) both
None

Solution :Donation of electrons from a filled d-orbital of metal into the vacant antibonding `pi^**` BONDING orbital of CO decreases the bond order three to two and half or slightly more thus INCREASING the bond length between C-O.
Bond order `PROP 1/("Bond length")`
40.

In metal lattices the co-ordination number of metal atom is usually

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2 or 4
4 or 6
6 or 8
8 or 12

Answer :D
41.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which one of the following metal carbonyl involves the d^(2)sp^(3) hybridization for the formation of metal-carbon sigma" "bonds and is paramagnetic ?

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`[Cr(CO)_(6)]`
`[V(CO)_(6)]`
`[Mo(CO)_(6)]`
`[W(CO)_(6)]`

Solution :'Cr' has GREATER electron density than 'W' due to small size. Hence Cr is a better `pi`-donor.
42.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which of the following statement is correct for metal carbonyls ?

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<P>In general, the effective ATOMIC number for a stable monomeric of the next INERT gas except `[V(CO)_(6)]`.
The metal-carbon bond in metal carbonyls posses both s and p character.
The C-O bond length in `[Cr(CO)_(6)]` is greater than that in `[W(CO)_(6)]`
All of these

Solution :'Cr' has greater electron density than 'W' due to small SIZE. Hence Cr is a better `pi`-donor.
43.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which one of the following metal carbonyls are inner orbital complexes with diamagnetic property ? (P) Ni(CO)_(4)""(Q) Fe(CO)_(5) (R ) V(CO)_(6)""(S) Cr(CO)_(6) Select the correct answer from the codes given below :

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P and Q only
Q, R and S only
Q and S only
P, Q and S only

Solution :'Cr' has GREATER ELECTRON density than 'W' DUE to small size. Hence Cr is a BETTER `pi`-donor.
44.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which of the following statement is false for nickel carbonyl [Ni(CO)_(4)]?

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It is a colourless compound.
The Ni-C-O group is linear.
The FOUR carbonyl group are lying at the CORNERS of a regular tetrahedron.
The metal-carbon bond length (for `SIGMA" "bond`) does not alter.

Solution :'Cr' has greater electron density than 'W' DUE to small size. Hence Cr is a BETTER `pi`-donor.
45.

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. The increase in bond length in CO as compared to carbon monoxide is due to :

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the donation of lone pair of electrons on the carbon into a VACANT ORBITAL of the metla atom.
the donation of a pair of electrons form a filled d-orbital of metal into the vacant antibonding `PI^(**)` orbital of carbon MONOXIDE.
(a) and (b) both
none.

Solution :Cr' has greater electron density than 'W' due to small size. Hence Cr is a BETTER `pi`-donor.
46.

In metal carbonyls the metal carbon bond length is found to be less than the expected bond length. Explain why ?

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Solution :It is due to SYNERGIC interaction between metal and CO which develops partial double BOND CHARACTER between metal and CO.
47.

In metal carbonyls, the oxidation state of the metal is ________

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0
`+2`
`+4`
`+6`

ANSWER :A
48.

In metal carbonyls, metal ligand sigma bond is formed by :

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VACANT orbital of metal and LONE pair of carbon
Vacant d-orbital and OCCUPIED `pi^(*)` orbital of LIGAND
Occupied d-orbital and vacant `pi^(*)` orbital of ligand
Vacant orbital of metal and lone pair of oxygen

Answer :A
49.

In metal carbonyl , there is __________.

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no `PI` BOND between CO and METAL atom
only `sigma` bond between metal atom and CO molecules
one `sigma` and one `pi` bond ( block-donation) between metal atom and CO molecules
the metal-carbon bonds does not exist at all

Answer :C
50.

In metabolic process the maximum energy is given by

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carbohydrates
proteins
vitamins
fats

Answer :A::D