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 carbon atoms in the compound (CN)_(4)C_(2) are

Answer»

SP HYBRIDIZED
`sp^(2)` hybridized
sp and `sp^(2)` hybridized
sp, `sp^(2) and sp^(3)` hybridized

Answer :C
Discussion
2.

The carbon atom carrying halogen atom is more electron deficient in

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SOLUTION :DUE to.the PRESENCE of three electron ATTRACTING`-NO_2` groups.
Discussion
3.

The carbocation fomed in S_(N^1) reaction of alkyl halide in the slow step is …………………… .

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`SP^3`hybridised
`sp^2` hybridised
`sp` hybridised
NONE of these

SOLUTION :`sp^2` hybridised
Discussion
4.

The carbocation CH_(3)overset(+)(C)HCH_(3) is less stable than

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`CH_(3)CH_(2)overset(+)(C)H_(2)`
`overset(+)(C)H_(2)`
`(CH_(3))_(3)overset(+)(C)`
`CH_(3)overset(+)(C)H_(2)`

Solution :`(CH_(3))_(3)C^(+)` is more STABLE than `CH_(3)overset(+)(C)HCH_(3)`. Rest all are primary carbocations hence LESS stable.
Discussion
5.

The carbo cation formed in SN_(1) reaction of alkyl halide in the slow step is

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`SP^(3)` hybridised
`sp^(2)` hybridised
sp hybridised
none of these

Solution :`sp^(2)` hybridised
Discussion
6.

The carbide which gives propyne on hydrolysis

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`Al_(4)C_(3)`
`CaC_(2)`
`Fe_(3)C`
`Mg_(2)C_(3)`

Solution :`Mg_(2)C_(3) + 4H_(2)O rarr 2MG(OH)_(2)+C_(3)H_(4)`
Discussion
7.

The carbide of which of the following metals on hydrolysis give allylene

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`Be`
`Ca`
`Al`
`MG`

Solution :`Mg_(2)C_(3)+4H_(2)O to 2mg(OH)_(2)+CH_(3)-UNDERSET("Allyene")(C )-=C-H`
Discussion
8.

The carbanion expels a leaving group LG to yield an alkene as shown above by

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E1CB mechanism
E1 mechanism
E2 mechanism
Such a REACTION does not TAKE place

Answer :A
Discussion
9.

The capacity to bring about coagulation increases with

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IONIC radii
Atomic radii
VALENCY of an ion
Size of an ion

Solution :The amountof ELECTROLYTE required to coagulated a fixed amount of a SOL DEPENDS upon the valency of flocculating ion.
Discussion
10.

The canonical or resonating structures of a molecule required to describe the structure of a molecule follow which of the following rules ?

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The RELATIVE position of all ATOMS can differ.
The same number of unpaired and paired ELECTRONS in all structures.
The energy of each structure is different.
Like CHARGES are present on adjacent atoms.

Solution :Canonical structures differ only in the position of electrons not in number of paired and unpaired electrons.
Discussion
11.

The calcium salt of which of the following acid on dry distillation gives 2, 4-dimethylpentan-3-one?

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Propionic acid
Isobutyric acid
Butyric acid
Adipic acid

Solution :`2[(CH_(3))_(2) CHCOO]_(2) CA OVERSET("Dry DISTIL")RARR (CH_(3))_(2) CH - overset(O)overset(||)(C) - CH (CH_(3))_(2) + CaCO_(3)`
Discussion
12.

The calcium contained in a solution of 1.048g of a substance being analysed was precipitated with 25mL H_(2)C_(2)O_(4). The excess of C_(2)O_(4)^(2-) in one fourth of filrtate was back titrated with 5mLof 0.1025N KMnO_(4). To determine the conc. of H_(2)C_(2)O_(4) soloution, it was diluted foru folds and titrationof 25mLof sameKmnO_(4) solution. Calculate % of Ca in substance.

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ANSWER :`14.94%`
Discussion
13.

The calcium concentration in plasma is regulated by which harmones

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INSULINE, Glucagon
Thyroxine, Testosteron
Esradiol Progesterone
Calcitonin, Parathyroid

Answer :D
Discussion
14.

The Ca^(2+) and F^(-)ions are located in CaF_(2) crystal, respectively at face centred cubic lattice points and in

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TETRAHEDRAL void
half of tetrahedral points
octahedral points
half of octahedral VOIDS.

Solution :In `CF^(2)` crystal, `Ca^(2^+)`ions are present at all CORNERS and atthe centre of each face of thecube and `F^(-)` ions occupy all the tetrahedral voids.
Discussion
15.

The C-O bond order in CO and CO_(2) respectively

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2,3 
2,2 
3,3 
3,2 

ANSWER :D
Discussion
16.

The (C-H) bond length order in hydrocarbons in which the hybridisation of carbon is sp^(3) or sp^(2) or sp

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`SP - s gt sp^(2) - s gt sp^(3) -s`
`sp - s = sp^(2) - s = sp^(3) - s`
`sp^(3) - s gt sp^(2) - s gt sp -s`
`sp^(3) - s gt sp - s gt sp^(2) -s`

ANSWER :C
Discussion
17.

The C - H bond distance is the longest in

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`C_(2)H_(2)`
`C_(2)H_(4)`
`C_(2)H_(4)Br_(2)`
`C_(6)H_(6)`

Answer :C
Discussion
18.

The C-H bond distance is largest in

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`C_2H_2`
`C_2 H_4`
`C_6 H_6`
`C_2 H_4 Br_2`

ANSWER :D
Discussion
19.

The C-H bond and C- C bond in ethane areformedby which of the followingtypes of overlap

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`SP^(3)-s` and `sp^(3)-sp^(3)`
`sp^(3)-s` and `sp^(2)-sp^(2)`
sp-sp and sp - sp
p-s and p-p

ANSWER :a
Discussion
20.

The C-Hbond and C-Cbond in ethane are formed by which of the following types of overlap

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`sp^(3)-s` and `sp^(2)-sp^(3)`
`sp^(2)-s` and `sp^(2)-sp^(2)`
`sp-sp` and `sp-sp`
`p-s` and `p-p`

ANSWER :A::B::C::D
Discussion
21.

The C-C bond lengt in diamond is "………….."while in graphite it is "…………..".

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ANSWER :`154` PM and `141.5` pm
Discussion
22.

The C-C bond length in benzene is equal due to……

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isomerism
tautomerism
`SP^(2)` hybridization
inductive effect

Answer :C
Discussion
23.

The C-C bond in benzene can be determined by

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X-ray diffraction
`gamma` - ray scattering
a -ray scattering

Solution :INTERNUCLEAR distance between carbon atoms in BENZENE ring is determined by X-ray diffraction.
It is the same between any TWO carbon atoms. There is equal probability of ACH carbon ATOM to get overlapped with p-orbital of another carbon atom
Discussion
24.

The C-C bond dissociation energy is

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103 K cals `"mole"^(-1)`
83 K cals `"mole"^(-1)`
8.3 K cals `"mole"^(-1)`
83 K cals `"mole"^(-1)`

ANSWER :B
Discussion
25.

The C-C bond distance is largest in

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`C_2 H_2`<BR>` C_2H_4`
`C_2 H_2 Br`
`C_2 H_6`

ANSWER :D
Discussion
26.

The C-C bond lengths in benzeneare

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`1.54A^@ & 1.34A^@ `
`1.34A^@ & 1.20A^@`
`1.39A^@ ` only 
`1.20A^@` only 

ANSWER :C
Discussion
27.

The C-C and C-H bond length in ethane are …………and ……….respectively

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145pm and 112pm
112 pm and 154 pm
154 pm and 112pm
112 pm and 145 pm

ANSWER :C
Discussion
28.

The by-product of solvay's ammonia process is.....

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CARBON dioxide
ammonia
calcium chloride
calcium carbonate

Answer :B
Discussion
29.

The by product of Solvay process is :

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`NH_(4)CI`
`CaCl_(2)`
`NH_(3)`
`Co_(2)`

Solution :`CaCI_(2)` is the by product in solvay PROCESS
Discussion
30.

The by-product of Solvay ammonia process is

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CARBON dioxide
Ammonia
CALCIUM chloride
Calcium carbonate

ANSWER :C
Discussion
31.

The butyl alcohol which gives iodoform test is

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n-Butyl alcohol
Isobutyl alcohol
sec-Butyl alcohol
tert-Butyl alcohol

Solution :`UNDERSET("sec-Butyl alcohol")(CH_(3)-underset(OH)underset(|)(CH)-CH_(2))-CH_(3) overset(I_(2)//NaOH)rarr underset("Iodoform")(CH_(3))darr+CH_(3)CH_(2)COONA`
Discussion
32.

The buring of hydrogen is called as

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Hydrogenation
Hydration
OXIDATION
Reduction

Solution :Oxidation
Discussion
33.

The bubble of a gas released at the bottom of alake increases to eight times its original volume when it reaches the surface. Assuming that atmospheric pressure is equivalent to the pressure exerted by a column of water 10 m height, the depth of the lake is

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80 m
90 m
40 m
70 m

Answer :D
Discussion
34.

The brown ring test for the NO_(3)^(-) ions is due to the formation of :

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`FeSO_(4).NO_(2)`
`[Fe(SO_(4))_(2) NO] H_(2)O`
`[Fe(H_(2)O)_(5) NO]^(2+)`
NONE of these

Solution :It is the correct ANSWER
Discussion
35.

The brown ring test for nitrates depends upon

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the reduction of NITRATE to nitric oxide
oxidation of nitric to nitrogen dioxide
reduction of ferrous sulphate OT iron
oxidising ACTION of sulphuric acid

Solution :Reduction of `NO_(3)^(-)` to NO. Refer to RING Test, PAGE 11/127.
Discussion
36.

The bromineatom possesses35electrons.itcontains6 electrons in 2porbitals6 elecrons in 3porbitaland 5electronin 4porbitalswhich of theseelectronexperience the lowesteffectivenuclear charge

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SOLUTION :4p orbitalhas LESS effectivenuclearcharge
Asn=4is morethann=2of 2pandn=3of 3p . `2p to3p to4p`successiveenergyincrease.Sothere isless ATTRACTION of nucleus on 4p .
Discussion
37.

The bromoderivative of C_(3)H_(7)CH_(2)COOH is formed on treating it with the bromine in presence of red phosphorus. The process is known as

Answer»

Dehydrogenation
Pseudohydrogenation
Hell-Volhard-Zelinsky reaction
Schotten-Bauman reaction

Solution :REFER to COMPREHENSIVE REVIEW
Discussion
38.

The bromine atom possesses 35 electrons. It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electrons in 4p orbital. Which of these electrons experience the lowest effective nuclear charge ?

Answer»

SOLUTION :OBVIOUSLY the `5.e^(-)` in 4p-orbital EXPERIENCE the LOWEST effective NUCLEAR charge.
Discussion
39.

The bromine atom possesses 35 electrons. It contains 6 electron in 2p orbitals, 6 electrons in 3p orbitals and 5 electrons in 4p orbitals. Which of these electron experiences the lowest effective nuclear charge?

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SOLUTION :4p electrons, being farthest from the nucleus, experience the lowest effective NUCLEAR charge.
For calculation of exact effective nuclear charge, These may be applied to bromine ATOM as follows: `._(35)Br = (1s^(2)) (2s^(2) 2p^(6)) (3s^(2) 3p^(6)) (3d^(10)) (4S^(2) 4p^(5))`
For `2p^(6), " " S = (0.35 xx 7) + (0.85 xx 2) = 2.45 + 1.70 = 4.15`
`Z_("eff")` for 2p electron `= 35 - 4.15 = 30.85`
For `3p^(6), S = (0.35 xx 7) + (0.85 xx 8) + (1.0 xx 2) = 2.45 + 6.80 + 2.0 = 11.25`
`Z_("eff")` for 3p electron `= 35 - 11.25 = 23.75`
For `4p^(5), " " S = (0.35 xx 6) + (0.85 xx 18) + (1.0 xx 10) = 2.10 + 15.30 + 10.0 = 27.40`
`Z_("eff")` for 4p electron `= 35 - 27.40 = 7.60`
Thus, 4p has the lowest effective nuclear charge
Discussion
40.

The bromide impurity in a 2.00 g sample of a metal nitrate is precipitated as silver bromide. If 6.40 mL of 0.200"M AgNO"_(3) solution is required, what is the mass percentage of bromide in the sample?

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`1.28`
`2.56`
`5.11`
`9.15`

ANSWER :C
Discussion
41.

The branching of alkanes that produces summetrical structures

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RAISES the BOILING POINT, raises the MELTING point
raises the boiling point, LOWERS the melting point
lowers the boiling point, lowers the melting point
lowers the boiling point, raises the melting point

Answer :A
Discussion
42.

The branching in an alkane increases its tendency of knocking. Comment over the statement and name the commonly used antiknocking agent.

Answer»


ANSWER :F
Discussion
43.

The branch of science associated with determining the changes in energy of a system by measuring the heat exchanges with surrounding is called ………….

Answer»

MECHANICS
AERODYNAMICS
KINETICS
Thermodynamics

Answer :B
Discussion
44.

The Boyle's law can be expressed graphically as

Answer»

<P>


SOLUTION :PV = CONSTANT `implies LOG P + log V ` = constant.
Discussion
45.

The bonds present in [Cu(NH_3)_4] SO_4 between copper and ammonia are

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ionic
covalent
co-ordinate
hydrogen

Answer :C
Discussion
46.

The bonds present in HCI moleculc are

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Non-polar COVALENT
Polar Covalent
IONIC
DATIVE

ANSWER :B
Discussion
47.

The bonds present in [Cu(NH_(3))_(4)]SO_(4) between copper and ammonia are

Answer»

IONIC
COVALENT
co-ordinate
HYDROGEN

ANSWER :C
Discussion
48.

The bonds not present in diborane is

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B-H
B-H-B
B-B
H-B-H

Solution :
In `B_(2)H_(6), B-B` BONDS are not PRESENT.
Discussion
49.

The bonds not present in diborane are

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B-H
B-H-B
B-B
H-B-H

Answer :C
Discussion
50.

The bond strength of C-X for the C-CI,C-Br,C-I,C-F decreases in the order is ……………….. .

Answer»

SOLUTION :C-F < C-Cl < C-Br
Discussion