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.

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g ? [Atomic mass : Na=23 , Cl=35.5]

Answer»

`5.14xx10^21`
`1.28xx10^21`
`1.71xx10^21`
`2.57xx10^21`

SOLUTION :ONE UNIT CELL HAS4 NaCl units , i.e., has mass `=(4xx58.5)/(6.02xx10^23)`g
`therefore` No. of unit cell in 1 g =`(6.02xx10^23)/(4xx58.5)`
`=2.57xx10^21`
Discussion
2.

How many unit cells are present in a cube -Shaped ideal crystal of NaCl of mass 1.00 g ?[ Atomic mass : Na = 23, Cl = 35.5 ]

Answer»

` 5.14 XX 10^(21)`
` 1.28 xx 10^(21)`
`1.71xx 10^(21)`
`2.57 xx 10^(21)`

SOLUTION :One unit CELL has 4 NaCl UNITS, i.e, has mass
`(4 xx 58.5)/(6.-02 xx 10^(23)) g`
No. of unit cells is 1 g = `(6.02 xx 10^(23))/(4xx 58.5)`
` = 2 .57 xx 10^(21)`
Discussion
3.

How many types of hidride compound

Answer»

2
3
4
5

Answer :B
Discussion
4.

How many types of H atoms are present in isobutane?

Answer»

SOLUTION :
Discussion
5.

How many types of functional groups are present in given compound

Answer»


ANSWER :5
Discussion
6.

How many types of functional groups are present in the following structure.

Answer»


ANSWER :4
Discussion
7.

How many types of equilibrium based on proportion of reactant and product ?

Answer»

Solution :There are three types of equilibrium based on proportion of reactant and product.
(i) Reactant is negligible and product is maximum : Such reaction is towards completion. At equilibrium the concentration of reactant is negligible. At equilibrium 100% product is there `K gt 10^3`.
e.g.: `H_(2(g)) + 1/2O_(2(g)) overset"500 K"HARR H_2O_((g))`
`K_c=2.4xx10^47`
In this way at equilibrium only `H_2O` is there.
(ii) Reactant is more and product is less mostly such reaction not take place : At equilibrium most of reactant REMAIN unreacted. The product is very less. Its equilibrium constant is very less i.e. `K gt 10^(-3)`. Such reaction hardly move in forward reaction and product is not form.
e.g. : `H_2O_((g)) overset"500 K"hArr H_(2(g)) + 1/2O_(2(g))`
`K_c=4.1xx10^(-48)`
(III) The reactant and products are comparable : In such reaction reactant and product both are at equilibrium. In such reaction `K_c 10^(-3)` to `10^3`. e.g., The following reaction possess `H_2 ,I_2` and HI at the equilibrium.
`H_(2(g)) + I_(2(g)) overset"700 K" hArr 2HI_((g)) , K_c`=57
Discussion
8.

How many types of bonds are present in LiAlH_(4)?

Answer»

SOLUTION :3 types-electrovalent, COVALENT, COORDINATE covalent BOND.
Discussion
9.

How many tricentric bonds are present in a diborane molecule?

Answer»

Solution :Hydrogen bridge bond (B-H-B) is CALLED a tricentric bond. This is also called banana bond.
DIBORANE molecule has two such tricentric bonds.
Discussion
10.

How many total open chain isomers are possible for stable alkene among the following ?

Answer»


SOLUTION :
Discussion
11.

How many total number of structural isomers of C_(4)H_(6)Cl_(2) are possible having cyclic structures?

Answer»


SOLUTION :
Discussion
12.

How many total number of structural isomers are possible for C_(4)H_(7)Cl having parent chain of four carbon?

Answer»


SOLUTION :N//A
Discussion
13.

How many total monochloro structural isomers obtained on chlorination of product (N)

Answer»

2
4
6
8

Answer :B
Discussion
14.

How many total isomers are possible for the formula C_(2)FClBrI?

Answer»


SOLUTION :
Discussion
15.

How many total atoms are in 1 mole of(NH_(4))_(2)Cr_(2)O_(7) ?

Answer»

`6.22xx10^(23)`
`114.47xx10^(23)`
`84xx10^(23)`
19

Solution :NUMBER of atoms in 1 MOLECULES of `(NH_(4))_(2) Cr_(2)O_(7)`
`= 2 [ N + 4 H] + 2Cr + 7 (O)`
`= 2 (1+4) + 2 + 7`
`= 19` atoms per `(NH_(4))_(2) Cr_(2)O_(7)`.
1 mole `(NH_(4))_(2) Cr_(2)O_(7)= 6.022xx10^(23)` atoms
`= 114.418xx10^(23)` atoms
`~~114.47xx10^(23)` atoms
Discussion
16.

How many total fundamental particles are there in tritium (isotope of hydrogen)?

Answer»

4
3
5
2

Answer :A
Discussion
17.

How many total electrons are there in antibonding molecular orbital of O_(2) ?

Answer»

SOLUTION :`sigma_(1s)^(**), sigma_(2s)^(**) , pi_(2p_(x))^(**) , pi_(2p_(y))^(**)`THUS, TOTAL FOUR.
`" 2211"`
Discussion
18.

How many toluidines on reaction with NaNO_(2)//HCl followed by H_(3)PO_(2) treatment gives Toluene.

Answer»


SOLUTION :N//A
Discussion
19.

How many times the normal electrons of hydrogen atom revolve round the nucleus in on sec ?

Answer»

SOLUTION :`"NUMBER of revolutions "=("velocity of the electron ")/("circumference of shell")`
For hydrogen electron in `n=1`, Velocity `= 2.18xx 10^(6) ms^(-1)`
`" Circumference of shell "= 2pir`
`2pixx0.529xx10^(-10)xxn^(2)m`
`=2xx3.14xx0.529xx10^(-10)xx1^(2)=3.33xx10^(-10)m`
`"Number of times the electrons revolve in one sec "= 2`
`(2.18xx10^(6))/(3.33xx10^(-10))=6.55xx10^(15)s^(-1)`.
Discussion
20.

How many times oxyhaemoglobin is less stable than carboxy haemoglobin ?

Answer»

50
200
250
300

Answer :C
Discussion
21.

How many times is the velocity of the electron in the first shell of He^(+) ion as compared to that in the first shell of hydrogen atom ?

Answer»


Solution :`v_(n) = v_(0) Z//n`. For H, Z = 1 and for 1st SHELL, n = 1
Hence, `v_(1) = v_(0)`
For `He^(+), Z = 2` and for 1st shell, n = 1. Hence
`v_(1) = 2v_(0)`
Discussion
22.

How many times is the radius of the 3rd shell of the hydrogen atom as compared to that of the radius of the first shell ?

Answer»


Solution :`r_(N) = a_(0) n^(2)//Z`. For H, Z = 1 and for n = 3
`r_(3) = a_(0) xx 3^(2) = 9 a_(0)`
Discussion
23.

How many times is the distance of maximum probability of 2p electron from the nucleus as compared to Bohr radius ?

Answer»


Solution :DISTANCE of maximum PROBABILITY of 2P electron `= 4a_(0)`
Discussion
24.

How many times is the ionization energy of He^(+) ion as compared to that of hydrogen atom ?

Answer»


SOLUTION :IONIZATION energy of `He^(+)` ION `= Z^(2) xx I.E._(H)`
`= 2^(2) xx I.E._(H) = 4 I.E_(H)`
Discussion
25.

How many times does light travel faster in vacuum than an electron in bohr first orbit of hydrogen atom?

Answer»

13.7 times
67 times
137 times
97 times

Solution :`v=(Z)/(n)xx2.188xx10^(8)cm//sec`
`v_(1)=(1)/(1)xx2.188xx10^(8)cm//sec`
`("VELOCITY of light")/("Velocity of electron")=(3XX10^(10))/(2.188xx10^(8))=137` times.
Discussion
26.

How many times an atom of calcium is heavier than an atom of carbon ?(C = 12, Ca = 40)

Answer»

Solution :An ATOM of calcium is `(40)/(12)i.e.(10)/(3)` TIMES heavier than an atom of CARBON.
Discussion
27.

How many times 1 M" " CH_(3) C O O H solution should be diluted so that pH of the solution is doubled ? (K_(a) of acetic acid = 1.8 xx 10^(-5))

Answer»

20 TIMES
200 times
`5.55 XX 10^(2)` times
`5.55xx10^(4) ` times

Solution :pH of a weak ACID `=(1)/(2)[pK_(a)-log C]`
`:.x=(1)/(2) [ pK_(a)-log 1] = (1)/(2) pK_(a)`
and `2x=(1)/(2)[pK_(a)-log c]`
or `pK_(a)=(1)/(2) pK_(a)-(1)/(2)log c (.:' 2x=pK_(a)]`
or `(1)/(2) log c = - (1)/(2) pK_(a)`
or `log c = -pK_(a)=log K_(a)`
or `c=K_(a)=1.8xx10^(-5)`
`:.` Dilution`=(1)/(1.8xx10^(-5))=5.55xx10^(4)` times
Discussion
28.

How many the conductivity of an intrinsic semiconductor be increased ?

Answer»

SOLUTION :The conductivity can be increased by dopingeither by adding electron rich IMPURITIES like that of P, As ETC. giving n-type SEMICONDUCTOR or by adding electron deficit impurities like that of B, Al etc. giving p-type semiconductor
Discussion
29.

How many tetrahedral angles does a molecule of methane have ?

Answer»

SOLUTION :SINCE methane has tetrahedral GEOMETRY, therefore, it has SIX tetrahedral angles.
Discussion
30.

How many sulphur atoms present in 2N 500 mL of sulphuric acid ? (At. Mass of H = 1, S = 32, O = 16 gms/mole)

Answer»

`1.515xx10^(23)`
`6.022xx10^(23)`
`1.5057xx10^(22)`
`3.0115xx10^(23)`

Solution :2N 500 mL `H_(2)SO_(4)` solution
Normality (N ) `=("wt. of solute" xx 1000)/("EQ. wt. of solute" xx "Vol of solution")`
`:.2 = (x xx1000)/(149xx500)`
`:.x=49g`
`:.` wt of `H_(2)SO_(4) = 49 g`
Moles of `H_(2)SO_(4) = 0.5` moles
No. of molecules in 0.5 moles of `H_(2)SO_(4)`
`=0.5xx6.022xx10^(23)`
`= 3.011xx10^(23)`
As `H_(2)SO_(4)` contains one sulphur atom
No. of sulphur atoms `= 3.011xx10^(23)xx1`
`= 3.011 xx10^(23)` atoms
Discussion
31.

How many sub-shells are associated with n=4 ? How many electrons will be present in the sub-shell having ms value of -1/2 for n=4 ?

Answer»

SOLUTION :For `n=4,` Four SUB-sheels NAMELY `4s, 4p, 4d and 4F ` are possible.
Total number of electrons present in these sub SHELLS having `m_(s)` value of `-1//2` is 16.
Discussion
32.

How many structures possible for a compound with the molecular formula C_(6)H_(12)O which can give positive iodoform and 2,4 -DNP test.

Answer»


ANSWER :4
Discussion
33.

How many structure of F is possible ?

Answer»

2
5
6
3

Solution :
Discussion
34.

How many structures are possible for C_(5)H_(8) with one triple bond?

Answer»

4
3
2
1

Solution :`C_(5)H_(8)` can have the following STRUCTURE with one triplee BOND.
`underset("Pent-1-yne")(CH_(3)-CH_(2)-CH_(2)-C)-=CH,underset("Pent-2-yne")(CH_(3)CH_(2)-C-=C-CH_(3))`
`underset("3-Methylbut-1-yne")(CH_(3)-underset(CH_(3))underset(|)(C)H-C-=CH)`
Discussion
35.

How many structural isomers of amines are possible for formula C_(4)H_(11)N?

Answer»


SOLUTION :
Discussion
36.

How many structural isomer(s) is/are possible for C_2H_4Br_2 ?

Answer»

A.1
B.2
C. 3
D.4

Answer :B
Discussion
37.

How many structural isomers are possible in the compound C_(3)H_(6)Cl_(2) ?

Answer»

3
2
4
Such ISOMERS are not possible

Solution :
Discussion
38.

How many structural isomers are possible with C_7H_8O?

Answer»


SOLUTION :
Discussion
39.

How many structural isomers are possible in structure c_(7)H_(9)N Containing benzene ring:

Answer»

5
4
6
20

Solution :
Discussion
40.

How many structural isomers are possible for C_(3)H_(9)N ?

Answer»

4
3
2
5

Solution :Structures and NAME of 4 isomers of `C_(3)H_(9)N`
Discussion
41.

How many structural isomers are possible by C_(4)H_(9)Br

Answer»


SOLUTION :
Discussion
42.

How many structural isomeric ketones having molecular formula (C_(5)H_(10)O) give iodoform test?

Answer»

1
2
3
4

Solution :
Discussion
43.

How many structural isomeric alkenes on hydrogenation give n -Pentane.

Answer»


ANSWER :2
Discussion
44.

In a mutational event, when adenine is replaced by guanine, it is a case of

Answer»

3
7
4
6

Solution :
Discussion
45.

How many structural formulas are possible when one of the hydrogen is replaced by a chlorine atom in anthracene?

Answer»

a. `3`
b. `7`
C.. `4`
d. `6`

SOLUTION :
Discussion
46.

How many structural cycloalkenes on catalytic hydrogenation gives methyl cyclohexane.

Answer»


SOLUTION :CYCLO ALKENES PROPERTIES
Discussion
47.

How many isomers could be obtained by replacing one hydrogen of propene with chlorine?

Answer»

2
4
6
8

Solution :3
Discussion
48.

How many structural and geometrical isomers are possible for dimethlcyclohexane?

Answer»

3, 6
4, 6
6, 4
3, 3

Solution :Structural isomers: TOTAL number of structural isomers = 4
GEOMETRICAL isomers :-
1, 2 dimethyl CYCLO hexane=2 (cis trans)
1, 3 dimethyl cyclo hexane=2 (cis & trans)
1, 4 dimethyl cyclo hexane=2 (cis & trans)
Total geometrical isomers = 6
Discussion
49.

How many sterwoiosomers of Lindane have centre of symmetry?

Answer»

2
3
4
0

Solution :LINDANE is
Discussion
50.

How many stereoisomers of 2,3-dichloro-butanoic acid ? Write the structures of thestereoisomers of the compound.

Answer»


ANSWER :4
Discussion