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 water molecules will be there in 3xx10^(-23) g sample of water?

Answer»


ANSWER :1
Discussion
2.

How many years it would take to spend one Avogadro number of rupees at a rate of 10 lakh of rupees in one second?

Answer»

Solution :Number of RUPEES SPENT in one secodn `=10^(6)`
Number of rupees spent in one year
`=10^(6)xx60xx60xx24xx365`
Avogadro's number of rupees will be spent.
`=(6.02xx10^(23))/(10^(6)xx60xx60xx24xx365)`
`=19.089xx10^(9)` years =1.9089`xx10^(10)` years.
Discussion
3.

How many water of crystallisition is/are present in the ore camallite?

Answer»


Solution :Carnalite in `KCO MgCI_(2)6H_(2)O`
Discussion
4.

How many water molecules are there in a drop of volume 0.05mL? (Density of water is 1g/mL)

Answer»

`1.67xx10^(21)`
`1.67xx10^(22)`
`1.67xx10^(23)`
`1.67xx10^(24)`

ANSWER :C
Discussion
5.

How manywater molecule(s) is/are present in microcomics salt ?

Answer»


Solution :Microcosmic salt is `NA(NH_(4))HPO_(4) 4H_(2)O`
Discussion
6.

How many water moleculer(s) is/arepresentsin compoiund whichin usingin boraxbead test?

Answer»


Solution :BORAX is `Na_(2)B_(4)O_(7),10H_(2)O`
Discussion
7.

How many varieties of heavy water are possible in terms of 3 different isotopes of oxygen

Answer»


SOLUTION :`(i) H-overset(16)(O)-D`
`(II) H-overset(17)(O)-D`
`(III) H-overset(18)(O)-D`
`(iv) D-overset(16)(O)-D`
(V)`D-overset(17)(O)-D`
`(vi) D-overset(18)(O)-D`
Discussion
8.

How many unpaired electrons present in the square planar [Pt(CN)_4]^(2-) ion ?

Answer»

Solution :
In `[PT(CN)_6]^(2-)` , no unpaired electrons are present and it is DIAMAGNETIC.
Discussion
9.

How many unpaired electrons are there is Ni^(2+)

Answer»

2
8
0
4

Answer :A
Discussion
10.

How many unpaired electrons are present in the central metal ion [CoCl_4]^(2-)

Answer»


SOLUTION :`CO^(+2) = [Ar]3D^(7)`
Discussion
11.

How many unpaired electrons are present in tin (z=50)?

Answer»

3
5
2
4

Solution :`SN(Z=50):[Kr]5s^(2)4D^(10)4P^(2)` (2unpaired)
Discussion
12.

How many unpaired electrons are present in Co^(3+), Fe^(2+)? Calculate their magnetic moment.

Answer»

Solution :`Co (Z = 27)Co^(3+)[Ar] 3d^(6)`
`Fe (Z = 26)Fe^(2+)[Ar]3d^(6)`
The number of unpaired ELECTRONS are 4 as FOLLOWS: Ar
Their magnetic moment is `mu= SQRT(4(4+2)) = sqrt(24) = 4.89 mu_(B)`
Discussion
13.

How many unpaired electrons are present in N_2^+

Answer»

1
2
3
4

Answer :A
Discussion
14.

How many unit cells of KBr are present in a 1.00 mm^(3) of KBr, KBr crystallizes in NaCl type of crystal lattice and its density is 2.75 g/cm^(3)

Answer»

Solution :In aunit CELL of KBr, there are four FORMULA units of KBr.
Therefore, density`(rho)=(4xx119)/(6.023xx10^(23)xxa^(3))=2.75
`implies a^(3)=2.778xx10^(-22) cm^(3)=2.778xx10^(-19)MM^(3)`
`implies` No. of unit CELLS per `mm^(3)=(10^(19))/(2.778)=3.6xx10^(18)`
Discussion
15.

How many unit cells are present in a cube-shaped ideal crystal ofNaCI of mass 1 .00 g? [Atomic masses : Na = 23, Cl = 35.5]

Answer»

`5.14xx10^(21)` unit CELLS
`1.28xx10^(21)` unit cells
`1.71xx10^(21)` units cells
`2.57xx10^(21)` unit cells

Solution :Number of formulas in CUBE shaped crystals
`=(1.0)/(58.5)xx6.02xx10^(23)` since in NACL TYPE of structure.
4 formula units form 'a' cell
`therefore `unit cells`=(1.0xx6.02xx10^(23))/(58.5xx4)=2.57xx10^(21)` unit cells.
Discussion
16.

How many unit cells are there in 1.00 gm cube shaped ideal crystal AB (MF = 60) having NaCl type lattice.

Answer»

`6.02 XX 10^(23)`
`2.50 xx 10^(21)`
`1.00 xx 10^(22)`
`6.02 xx 10^(24)`

Answer :B
Discussion
17.

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

Answer»

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

SOLUTION :Number of NaCl units per unit CELL = 4
Number of NaCl units in 1 g NaCl `= 1/58.5 xx N_A`
`therefore`Number of unit cell in 1 g NaCl `= (N_A)/(58.5 xx 4)`
Discussion
18.

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g ?

Answer»

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

ANSWER :D
Discussion
19.

How many unit cells are present in 2 gm of potassium (Atomic mass = 39) ? (bcc arrangement)

Answer»

`2.88 xx 10^(20)`
`1.54 xx 10^(22)`
`5.25 xx 10^(14)`
`5.85 xx 10^(12)`

ANSWER :B
Discussion
20.

How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.0 g ?

Answer»

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

Solution :No. of NaCl molecules in a unit CELL = 4
MASS of unit cell `= ( 4 xx 58.5)/( 6.022 xx 10^(23))`
No. of unit CELLS in 1 g
` = ( 1 xx 6.022 xx 10^(23))/( 4 xx 58.5) = 2.57 xx 10^(21)` unit cells
Discussion
21.

How many uncharged resosnace structures are possible for given azulene (including given structure)?

Answer»


ANSWER :2
Discussion
22.

How many unit cells are possible for the crystallographic dimensions as a ne b ne c alpha=gamma =90^(@),alphane beta

Answer»

1
2
3
4

Answer :B
Discussion
23.

How many types of substituted alcohols (stereoisomers arenot considered) are possible in the given reaction ?

Answer»


SOLUTION :N//A
Discussion
24.

How many types of solutions are formed ?

Answer»

SOLUTION :THREE TYPES of SOLUTIONS are FORMED .
Discussion
25.

How many types of functional groups are present in the given compound?

Answer»


5
4
7

Solution :NA
Discussion
26.

How many types of particles among the following are emitted during the decay of sulphur-35 nucleus , beta - emmission, e^(-) capture , positron emission , neutron emission

Answer»

<P>

Solution :`""_(16) S^(35)`
`(n)/(p) = (19)/(16) = 1.1875 } implies` high `((n)/(p))` to DECREASE `((n)/(p))` RATIO
Discussion
27.

How many types of primitive unit cells are there ?

Answer»

Solution :There are SEVEN TYPES of PRIMITIVE uit CELLS.
Discussion
28.

Howmany typesof carbon - carbon bonds are present in 1-butyne ?

Answer»

4
3
2
1

Answer :B
Discussion
29.

Howmanytypesofcarbonatomsarepresentin2,2,3 - trimethylpentane ?

Answer»

ONE
TWO
three
four

Answer :D
Discussion
30.

How many tripeptides can be prepared by linking the amino acids glycine,alanine and phenyl alanine?

Answer»

ONE
THREE
Six
Twelve

Answer :C
Discussion
31.

How many triatomic species has/have two lone pairs on the central atom ? SF_(4), I_(3)^(-), XeF_(2), NCl_(3), NO_(2)^(-), H_(2)O, OF_(2), OCl_(2), NF_(3), BCl_(3), XeF_(4), ClF_(3)

Answer»


SOLUTION :
Discussion
32.

How many trichloroethanes would be produced when 1, 1-dichloroethane reacts with chlorine ?

Answer»

One 
TWO 
Three 
FOUR 

ANSWER :B
Discussion
33.

How many transition states are formed during formation of major product in above reaction ?

Answer»


SOLUTION :N//A
Discussion
34.

How many transition series of elements are there in the periodic table.

Answer»

Solution :There are four main series of transition elements CORRESPONDING to the filling of 3D, 4d, 5d and 6d sublevels in 4TH, 5th, 6TH and 7th periods. The four series are known as first transition series or 3d series, second transition or 4d series, THIRD transition or 5d series and fourth transition or 6d series.
Discussion
35.

How many transiiton series of elementsare there in the periodictable ? Name them.

Answer»

Solution :There are four main transition series of ELEMENTS correspong to filling of 3D, 4d, 5d and 6d SUBLEVELS in4th, 5TH, 6th and7th periods. They are known as first transition series , second transition or 4d series, third transition or 5dseries and FOURTH transition or 6d series.
Discussion
36.

How many total sodium ions are present in oneformula uint of sodium ethane-1,2-diaminetetraacetatochromate (II) and sodium hexanitrito cobaltate (III) ?

Answer»


ANSWER :`05`
Discussion
37.

How many total possible isomers are present in the following complex ? [Co(gly)NH_(3)H_(2)O(CN)(NO_(2))]

Answer»

24
48
96
12

Solution :
`[M(AB)abcd]`
(a opp B) `IMPLIES` C, d and d, c]2
(a opp c) `implies` (b, d)(d, c)=2
(a opp d) `implies=2`
(b opp c) `implies=2`
(b opp d) `implies=2`
(c opp d) `implies=(2)/(12)`

All are O.A.
So, 48xx2=96
Discussion
38.

How many total possible isomers are present in the following complex ? [Co(en)NH_(3)(H_(2)O)(Cl)(NO_(2))]

Answer»

24
48
96
12

Solution :[M(AA) ABCD]

`"a OPP" b to 1`
`"a opp C" to 1`
`"a opp d" to 1`
`" opp c" to 1`
`b "opp d" to 1`
`"b opp d" to (1)/(ul6)`
Discussion
39.

How many total possible isomers are present for [Pt(CN)_(2)(NO_(2))_(2)]^(2-) ?

Answer»

2
4
10
19

Solution :`[Pt(CN)_(2)(NO_(2))_(2)]^(2-)`
`leftarrow EQUIV N' rightarrow`
`O=underset(downarrow)N-O^(Ɵ)rightarrow`
(C, C)[(N, N) or (N, O) or (O, N) or (O, O)]= 4
`(C, N') IMPLIES 4`
`(N', N') implies 4`
(C, N) `implies` [(C, N), (N', N), (C, O), (N', O)] = 4
(C, O) `implies` [(N', N), (N', O)] = 2
(N', N) `implies` [N', O] = 1
`(N', O) `implies` -
Total = 19
Discussion
40.

How many total number of optically active products are formed.The given compound is (S)-2-Chloro-2-methylbutane.

Answer»


ANSWER :3
Discussion
41.

How many total isomers including constitutional isomers and stereoisomers are possible for the complex [Rh (en)_2 (NO_2)(SCN)]^(+)?

Answer»


SOLUTION :
Discussion
42.

How many total number of alkenes are possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH?

Answer»


SOLUTION :TOTAL no. of ALKENES will be =5
Discussion
43.

How many times the number of tetrahedral voids are there as compared to octahedral voids?

Answer»

0.5 
2 
8 
4 

ANSWER :B
Discussion
44.

How many times rate of reaction increases when temperature is incereased from - 4.2""^(@)C to 25.8""^(@)C.

Answer»

SOLUTION :8 TIMES.
Discussion
45.

How many times larger is a hydrogen atom than the radius of an H atom in its ground state if the H atom with an electron characterised by a quantum number of 106?

Answer»

106
212
11236
none of these

Answer :C
Discussion
46.

How many times is a kg heavier than a mg?

Answer»

`10^3`
`10^5`
`10^6`
`10^9`

SOLUTION :`1KG = 10^3g = 10^3 XX 10^3 xx 10^3 MG = 10^6 mg `
Discussion
47.

How many times does the t_(1//2) of zero order reaction increases if the initial concentration of the reactant is doubled ?

Answer»

SOLUTION :`t_(1//2)` GETS DOUBLED.
Discussion
48.

How many times an atom of sulphur is heavierthan an atom of carbon ?

Answer»

32 times
12 times
8/3 times
12/32 times

SOLUTION :An ATOM of sulphur is 32/12 i.e. 8/3 times heavier than an atom OFCARBON
Discussion
49.

How many times a solution of pH =2 has higher acidic nature than the solution of pH=6 ?

Answer»

1000
12
400
4

Answer :A
Discussion
50.

How many time is required to complete reaction when initial concentration of reactant is [R]_(0) zero order reaction?

Answer»

`([R]_(0))/(K)`
`(2[R]_(0))/(K)`
`([R]_(0)^(2))/(K)`
`(1)/(2)([R_(0)])/(K)`

Solution :If the TIME of zero order reaction =t ,then `t=([R]_(0)[R])/(k)`
If the zero order reaction BECOMES 100% ,then final concentration R will be zero.
`therefore [R]`=zero=[R]
If we put this VALUE in the EQUATION,
`t=([R]_(0)-0.0)/(k)`
`therefore t=([R]_(0))/(k)` ,So option (C) is correct
Discussion