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.

The cornpressibility factor of a van der Waals gas at the critical point is equal to

Answer»

0
1
0.375
any value

Answer :C
Discussion
2.

The cornpound X, in the reaction, Xoverset(CH_(3)Mgl)toYoverset("Hydrolysis")toMg(OH)I+CH_(3)COOH is:

Answer»

HCHO
`CH_(3)CHO`
`(CH_(3))_(2)CO`
`CO_(2)`

ANSWER :D
Discussion
3.

The corect order of decreasing length of the bond as indicated by the arrow in the following structures is

Answer»

`I gt II gt III`
`II gt I gt III`
`III gt II gt I`
`I gt III gt II`

SOLUTION :(c) : In general ,
C = C bond length is 1.33 Å
C - C bond length is 1.54 Å

Here, resonance is concentrated in between (5, 6), (6, 7) and (6, 8). So, partial double bond CHARACTER is lesser in between (6 & 7) than that of (2 & 3) in (I).

So, the order of single bond character is ,
11 - 12 `gt` 6 - 7 `gt` 2 - 3
THUS , bondlength order will be `III gt II gt I`.
Discussion
4.

The copounds which is not coloured is

Answer»

`K_(4)Fe(CN)_(6)`
`K_(3)Fe(CN)_(6)`
`Na_(2)CdCl_(4)`
`Na_(2)CuCl_(4)`

Solution :In `Na_(2)CD Cl_(4)`, Cd has oxidatin state +2.
So, its ELECTRONIC configuration is `4d^(10)4s^(0)`
All the 4d orbitals are fully filled.
hence, there will not be d-d transition resulting in colour. So, it is colourless.
Discussion
5.

The core of a non-luminous Bunsen burner flame is observed to be yellow in colour. This is because of :

Answer»

Contamination from the METAL of the BURNER
IMPURITIES in the fuel
Incomplete combustion
None of the above

Answer :C
Discussion
6.

The coordination polyhedra of [Ni(CO)_(4)] is …………

Answer»

Octahedral
Tetrahedral
Square planar
Pyramidal

Answer :A::B::D
Discussion
7.

The coordination polyhedral of [Ni(CO)_(4)] is …………… .

Answer»


ANSWER :TETRAHEDRAL
Discussion
8.

The coordination polyhedra of K_(3)[Fe(CN)_(6)] is …………

Answer»

SQUARE planar
Tetrahedral
Linear
Octahedral

Answer :A::C::D
Discussion
9.

The coordination number X (---) of each ion in KBr is changed to Y (---) by

Answer»

X=6 to Y= 8 APPLYING high temperature
X=8 to Y=6 applying high pressure
X=6 to Y= 8 applying high pressure
none of these

Solution :On increase in pressure , the size of both the CATION and anion decreases but the latter decreases much more RAPIDLY . In consequence the RATIO `r_(+)//r_(-)` increases and so also the coordination NUMBER .
Discussion
10.

The coordination numbers of oxygen and silicon in SiO_(4)respectively

Answer»

1,2
2,1
2,4
4,2

Answer :C
Discussion
11.

The coordination number of nickel (II) ion is 4. NiCl_(2)+underset(("excess"))(KCN)tounderset(("cyano complex"))(X) X+underset(("excess"))(conc. HCl)tounderset(("chloro complex"))(Y) The IUPAC names for the complexes X and Y are respectively.

Answer»

potassium tetracyanidonickle (II) , potassium tetrachloridonickle (II)
tetracyanidonickel(II), tetracyanidonickel(II)
tetracyanido potassium nickelate(II), tetrachlorideo potassium nickelate(III)
potassium tetracyanidoickelate(II), potassium tetrachloridonickelate (II).

SOLUTION :`NiCl_(2)+underset(("excess"))(4KCN)tounderset("potassium tetra cyanidonickelate"(II))underset(X)(K_(2)[Ni(CN)_(4)])+2KCL`
`K_(2)[Ni(CN)_(4)]+4HCl to underset("potassium tetrachloridonickelate"(II)) (K_(2)[Ni(Cl)_(4)])+4HCN`
Discussion
12.

The coordination number of Pt in [Pt(NO_(2))(H_(2)O)(NH_(3))_(2)] Br is……. .

Answer»


ANSWER :`4`
Discussion
13.

The coordination number of zinc sulphide is ............ …………………….

Answer»

3
4
6
8

Answer :B
Discussion
14.

The coordination number of Ni^(2+) is 4 NiCl_(2)+KCN ("excess")rarr A("cyano complex") A + conc. HCl ("excess")rarr B ("chloro complex") The hybridisation of A and B are

Answer»

`DSP^(2), SP^(3)`
`sp^(3), sp^(3)`
`dsp^(2), dsp^(2)`
`sp^(3)d^(2), d^(2)sp^(3)`

SOLUTION :`A=dsp^(2), B = sp^(3)`
Discussion
15.

The coordination number of Ni^(2+) is 4 NiCl_(2)+KCN ("excess")rarr A("cyano complex") A + conc. HCl ("excess")rarr B ("chloro complex") Predict the magnetic nature of A and B

Answer»

Both are diamagnetic
A is diamagnetic and B is PARAMAGNETIC with one UNPAIRED electron
A is diamagnetic and B is paramagnetic with TWO unpaired electrons
Both are paramagnetic

Solution :
Discussion
16.

The coordination number of Ni^(2+) 4 NiCl_(2) + KCN (excess) to A (cyano complex) NiCl_(2) + Conc. HCI (excess) to B (chloro complex)QThe hybridization of A and B are

Answer»

`DSP^(2)SP^(3)`
`sp^(3) sp^(3)`
`dsp^(2) dsp^(2)`
`sp^(3)d^(2)d^(2)sp^(3)`

ANSWER :A
Discussion
17.

The coordination number of Ni^(2+) 4 NiCl_(2) + KCN (excess) to A (cyano complex) NiCl_(2) + Conc. HCI (excess) to B (chloro complex)QPredict the magnetic nature of A and B

Answer»

Both are DIAMAGNETIC
A is diamagnetic and B is paramagnetic with ONE unpaired electron
A is diamagnetic and B is paramagnetic with TWO unpaired electrons
Both are paramagnetic

Answer :C
Discussion
18.

The coordination number of Ni^(2+) is 4 NiCl_(2)+KCN ("excess")rarr A("cyano complex") A + conc. HCl ("excess")rarr B ("chloro complex") The IUPAC names of A and B are

Answer»

POTASSIUM tetracyanonickeltate(II), potassium tetrachloronickeltate(II)
Tetracyanopotassium nickelate(II), tetrachloro-potassiumnickelate(II)
Tetracyanonickel(II), tetrachloronickel(II)
Potassium tetracyanonickel(II), potassium tetrachloronickel(II)

SOLUTION :`NiCl_(2)+4 KCNrarrK_(2)underset("tetracyanonickelate(II)")underset("Potassium")underset(("A"))([Ni(CN)_(4)])+2KCL`
`K_(2)[Ni(CN)_(4)]+4HCL ("excess")RARR underset("tetrachloronickelate(II)")underset("Potassium")(K_(2)[NiCl_(4)])+HCN`
Discussion
19.

The coordination number of Ni^(2+) 4 NiCl_(2) + KCN (excess) to A (cyano complex) NiCl_(2) + Conc. HCI (excess) to B (chloro complex)QThe IUPAC name of A and B are

Answer»

POTASSIUM tetracyanonickelate (IL), potassium tetrachloronickelate (II)
Tetracyanopotassiumnickelate (II), teterachlorpotassiumnickelate (II)
NICKEL (II), tetrachloronickel (II)
Potassium tetracyanonickel (II), potassium tetrachloronickel (II)

ANSWER :A
Discussion
20.

The coordination number of metal M in the complen [M(en)(C_(2)O_(4))ClBr]^(-) is

Answer»


ANSWER :6
Discussion
21.

The coordination number of h.c.p. or c.c.p. structure is 12, that is, one atom touches 12 other atoms. The 12 atoms lie as

Answer»

8 ATOMS are on the same plane, 2 above and 2 below the plane
6 atoms are on the same plane, 3 above and 3 below the plane
4 atoms are on the same plane, 4 above and 4 below the plane
2 atoms are on the same plane, 5 above and 5 below the plane

Answer :B
Discussion
22.

The coordination number of Fe in K_(3)[Fe(CN)_(5)NO] is…… .

Answer»


ANSWER :`6`
Discussion
23.

The coordination number of CsCl is .......................................

Answer»

3
4
6
8

Answer :D
Discussion
24.

The coordination number of cobalt in [CO(NO_(2))_(3)(NH_(3))_(3) is……….. .

Answer»


ANSWER :`6`
Discussion
25.

The coordination number of [Cr(en)_(3)][CrF_(6)] and oxidation state of Cr are…….. .

Answer»


ANSWER :`6,+3`
Discussion
26.

The coordination number of cobalt in [CO(NH_(3))_(4)Cl_(2)]Cl is……… .

Answer»


ANSWER :`6`
Discussion
27.

The coordination number of Ca^2+ ion in fluorite crystal is:

Answer»

2
8
6
4

Answer :B
Discussion
28.

The coordination number of Ca^(2+) ion in fluorite crystal is:

Answer»

2
8
6
4

Answer :B
Discussion
29.

The coordination number of a metal in coordination compound is

Answer»

Same as PRIMARY valency
Sum of primary and SECONDARY valencies
Same as secondary valency
Twice the primary valency

Answer :C
Discussion
30.

The coordination number of a metal crystallizing in a hexagonal close packed structure is

Answer»

4
12
8
6

Solution :In HCP, co-ordination no. is 12.
Discussion
31.

The coordination number of a metal crystallising in a hexagonal close-packed structure is

Answer»

12
4
8
6

Answer :A
Discussion
32.

The coordination number of a metal crystallising in a hexagonal close-packed structure is :

Answer»

12
4
8
6

Answer :A
Discussion
33.

The coordination number of a metal crystallising a hcp structure is

Answer»

`12`
`8`
`6`
`4`

ANSWER :A
Discussion
34.

The coordination number of a centrla metal atom in a complex is determined by :

Answer»

The number of only anionic ligands BONDED to the metal ion
the number of MONODENTATE lingands AROUND a metal ion bonded by pi-bonds
the number of monodentate lingands around a metal ion bonded by `SIGMA` and pi-bonds both
the number of monodentate ligands around a metal ion bonded by `sigma`-bonds

Answer :D
Discussion
35.

The coordination number of a central metal atom in a complex is determined by the number of _________.

Answer»

ligands around a metal ions is BONDED by both SIGMA and pi-bonds
ligands around a metal ion bonded by pi-bonds.
ligands around a metal ion bonded by COORDINATE bond.
only anionic ligands bonded to the metal ion.

Answer :C
Discussion
36.

The coordination number of a body-centred atom in cubic structure is

Answer»

4
6
8
12

Answer :C
Discussion
37.

The coordination number, EAN of the central metal atom and geometry of the complex ion obtained by adding CuSO_4 to excess of aqueous KCN are respectively.

Answer»

`4, 35 , sp^2 d `
`6,36, sp^3 d^2`
`4,36 , sp^2 d`
`4,35, sp^3`

Solution :`CuSO_4 + 2KCN to Cu(CN)_2 + K_2 SO_4`,
`2Cu(CN)_2 to Cu_2 (CN)_2 + (CN)_2`
`Cu_2 (CN)_2 + 6KCN to K_3[Cu(CN)_4],`
`O.N. ` of Cu= +1
`Cu^(2+) (29) =(AR)3d^(10)`
Discussion
38.

The coordination number and the oxidation state of element E in the complex [E(en)_(2)(C_(2)O_(4))]NO_(2) (where en is ethylene diamine) are, respectively :

Answer»

4 and 2
4 and 3
6 and 3
6 and 2

Solution :`[OVERSET(+3)E(EN)_(2)(C_(2)overset(-2)O_(4))]Noverset(-1)O_(2)`
Discussion
39.

The coordination number and oxidation number of 'x' in the following, Compound [x(NH_(3))_(5)(SO_(4))]Cl will be

Answer»

10 and 3
2 and 6
6 and 3
6 and 4

Solution :Both `NH_(3)` and `SO_(4)^(2-)` are monodentate LIGANDS so, co-ordination no. of X is 6. No. of X is +3.
Discussion
40.

The coordination number and oxidation number of M in the compound [M(SO_4 )(NH_3)_5] will be

Answer»

6 and 3
2 and 6
6 and 2
3 and 6

Answer :C
Discussion
41.

The coordination compounds are of great importance. These compounds are widely present in the mineral, plant and animal worlds and are known to play many important functions in the area ofanalytical chemistry, metallurgy, biological systems, industry and medicine. In which of the following processes, co-ordination complex formation/usage is done for extraction of metals ?

Answer»

Mc ARTUR FORREST CYANIDE process
Mond's process
Both (a) and (b)
None of these

Answer :C
Discussion
42.

The coordination compounds are of great importance. These compounds are widely present in the mineral, plant and animal worlds and are known to play many important functions in the area ofanalytical chemistry, metallurgy, biological systems, industry and medicine. Which of the following reagents can be used for qualitative and quantitative analysis (based on colour reactions) as well as for estimation of hardness of water ?

Answer»

EDTA
DMG
`alpha-nitroso-beta-naphthol`
Cupron

Answer :A
Discussion
43.

The coordination compound of which one of the following compositions will produce two equivalents of AgCl on reaction with aqueous silver nitrate solution ?

Answer»

`CoCl_(3).3 NH_(3)`
`CoCl_(3).6 NH_(3)`
`CoCl_(3).4 NH_(3)`
`CoCl_(3).5 NH_(3)`

SOLUTION :Coordination number of cobalt is 6. To PRODUCE two equivalents of AGCL, two ionizable chlorine should be present which is possible in (d) as `[Co(NH_(3))_(5)Cl]Cl_(2)`.
Discussion
44.

The coordination isomerism is exhibited by :

Answer»

`[CR(NH_(3))_(6)][CO(CN)_(6)]`
`[Cr(NH_(3))_(4)(NCS)_(2)]SCN`

`[Cr(NH_(3))_(6)]Cl_(3)`

Answer :A
Discussion
45.

The cooling in refrigerator is due to:

Answer»

The WORK of compressor
The EXPANSION of GAS in the refrigerator
Expansion of ice
Reaction of the refrigerator

Answer :B
Discussion
46.

The cooling in refrigerator is due to

Answer»

reaction of the refrigerator gas
expansion of ice
the expansion of the gas in the refrigerator
the WORK of the compressor

Solution :This is BASED on Joule-Thomson EFFECT
Discussion
47.

The cooling caused by the adiabatic expansion of a compressed gas below its inversion temperature (T_i) without doing external work is called :

Answer»

Joule-Thomson effect
Adiabatic demagnetism
Tyndall effect
Compton effect

Answer :A
Discussion
48.

The coolant usually contains a solution of antifreeze prepared by mixing equal volumes of ethylene glycol, C_2 H_4 (OH)_2and water. The density of ethylene glycol is 1.113 g/mL. Calculate the f.p. of the mixture. K_f for H_2Ois 1.86.

Answer»

SOLUTION :`-33.4^@C`
Discussion
49.

The coolant used in the reaction core can be

Answer»

Heavy water
Molten SODIUM
Alloy of sodium and potassium
Molten silver

Solution :Except molten silver, all other given susbtances are USED as coolants
Discussion
50.

The -COOH group in a carboxylic acid can be replaced by 'H' by heating the acid with:

Answer»

Zn with HCL
`H_2` in PRESENCE of NICKEL
soda lime
Bromine and concentrated aqueous alkali

Answer :C
Discussion