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 comers of SiO_(4) units are shared in the formation of three dimensional silicates?

Answer»

1
2
3
4

Answer :D
Discussion
2.

How many coordination number can shown by beryllium ?

Answer»

Four
Six
Two
Eight

Solution :BERYLLIUM having only 4 VALENCY in its VALENCE orbital. Hence, it can show 4 coordination number.
Discussion
3.

How many conformations of alkane are present ? Why ?

Answer»

Solution :Alkanes can have infinite number of conformation by rotation around C-C single bonds.
Reason : Sigma bond is present between two CARBONS in alkane. Electron distribution of the sigma molecular orbital is symmetrical around the intermolecular AXIS of the C-C bond which is not disturbed due to rotation about its axis. This rotation results into different SPATIAL ARRANGEMENT of ATOMS in space which can charge into one another.
Discussion
4.

How many compounds formed upon the ozonolysis of the following triyne ?

Answer»


SOLUTION :
Discussion
5.

How many compounds formed monochlorination of 2,2,6-trimethylheptane

Answer»

FIVE
FOUR
Seven
Six

SOLUTION :Monochlorination
Discussion
6.

How many compounds are theretically possible for formula (C_(6)H_(6)O) (excluding stereisomers)?

Answer»


SOLUTION :
Discussion
7.

How many compounds are organic compounds among the compounds given below ?

Answer»


ANSWER :9
Discussion
8.

How many Cl^(-) ions are there around Na^(+) ion in a NaCl crystal?

Answer»

3
4
6
8

Solution :(C ) In NaCl, both `Na^(+)` and `CL^(-)` ions, have COORDINATION NUMBER 6
Discussion
9.

How many chlorine atoms will be ionised CI rarr CI^(+) +e^(-1) by the energy released from the process CI +e^(-1) rarr CI^(-) for 6.02 xx 10^(23) atoms (I.P. for CI = 1250 kJ mol^(-1) and E.A. = 350 kJ "mole"^(-1))

Answer»


Solution :`[N_(A)XX E.A = I.P xx n 6.02 xx 10^(23) xx 350 = 1250 xx n]`
Discussion
10.

How many chloride ions are present in 250mL of 0.1F calcium choride solution?

Answer»


ANSWER :`3.01xx10^(22)`
Discussion
11.

How many chiral compounds are possible on mono chlorination of 2-methyl butane ?

Answer»

2
4
6
8

Solution :
Out of the four PRODUCTS formed above, II and IV are CHIRAL, produced in PAIRS, giving total of SIX mono-chlorination.
Discussion
12.

How many chiral centres are present in the following compound ?

Answer»


SOLUTION :
Discussion
13.

How many chiral centres are present in

Answer»


SOLUTION :N//A
Discussion
14.

How many change in electron and electric charge in balance half reduction reaction for following redox reaction on left hand side ? Cr^(3+)+ClO_(3)^(-)toClO_(2)^(-)+Cr_(2)O_(7)^(2-)

Answer»

`6,-3`
`6,-2`
`6, 3`
`6,-4`

Solution :Reduction HALF reaction :
`UNDERSET((+5))(ClO_(3)^(-))tounderset((+3))(ClO_(2)^(-))`
`ClO_(3)^(-)+2e^(-)underset(2H^(+))toClO_(2)^(-)+H_(2)O`
Number of `e^(-)=2xx3=6`
CHARGES = 3
Balance above reaction multiply by 3 for completion.
Discussion
15.

How many chiral C are present in estrone ?

Answer»


SOLUTION :
Discussion
16.

How many chiral carbon atoms are present in 2, 3, 4 -trichoropentane?

Answer»

3
2
1
4

Solution :1
Discussion
17.

How many -CH_3 group are present in given alkane ?

Answer»


ANSWER :2
Discussion
18.

How many centre of symmethty are present in CH_(4) ?

Answer»


SOLUTION :N//A
Discussion
19.

How many carboxylic acid structures (structural isomers) can be written from the molecular formula C_(6)H_(12)O_(2).

Answer»

4
6
8
10

Solution :`C-C-C-C-C-COOH`
`C-C-C-UNDERSET( C )underset(|)C-COOH`
`C-C-underset( C )underset(|)C-C-COOH""C-underset( C )underset(|)C-C-C-COOH`
`C-C-underset( C )underset(|)OVERSET( C )overset(|)C-COOH""C-underset( C )underset(|)overset( C )overset(|)C-C-COOH`
`C-underset( C )underset(|)C-underset( C )underset(|)C-COOH""C-C-underset( C )underset(|)underset( C )underset(|)C-COOH`
Discussion
20.

How many carbons are there in the longest chain for IUPAC nomenclature of the molecule CH_(3)-CH_(2)-CH(CH_(2)-CH_(2)-CH_(3))_(2)?

Answer»

4
6
7
9

Answer :C
Discussion
21.

How many carbons are present in parent chain CH_(3) underset(underset(CH_(2)CH_(3))(|))(C H)- CH_(2) underset(underset(CH_(3))(|))(CH) CHOHCH_(3)

Answer»

5
6
7
4

Answer :C
Discussion
22.

How many carbon atoms are sp^(3) hybridized in but-2-en ?

Answer»

4
2
3
1

Solution :`underset(sp^(3))underset(|)overset(1)(CH_(3))-underset(sp^(2))underset(|)overset(2)(CH)=underset(sp^(2))underset(|)overset(3)(CH)-underset(sp^(3))underset(|)overset(4)(CH_(3))`
There is a double bond between `C_(2)` and `C_(3)`, they both POSSESS `sp^(2)` hybridization, there s a SINGLE bond between `C_(1)` and `C_(3)` so they both possess `sp^(3)` hybridization.
Discussion
23.

How many calories are requiredto heat 40 gram of argonfrom 40 to100^(@)C at constant volume ?( R= 2 cal // molK)

Answer»

120
2400
1200
180

Solution : For a monoatomic gas like argon, `C_(v) = 3cal mol^(-1), C_(p) = 5 cal mol^(-1)`. Molar HEAT capacity is the heat required to raise the temperature of 1 MOLE of the gas by `1^(@)C `. 40 g of argon `=` 1 mole. Hence,heat required to raiseto raise the temperature from `40^(@)` to `100^(@)C` at constant volume `= 3 xx ( 100 - 40) = 180 cal`
Discussion
24.

How many Ca^(2+) and Cl^(-) ions are present in one mole of CaCl_2?

Answer»

SOLUTION :`CA^(2+)= 6.022 xx 10^(23), CL^(-) = 1.205 xx 10^(24)`
Discussion
25.

How many C - C sigma- bonds are present in the given compound?

Answer»


ANSWER :5
Discussion
26.

How many bridging atoms are present in P_(4)O_(10) ?

Answer»

6
4
2
5

Solution :Refer to FIG. 11.36, PAGE 11//135. There are six BRIDGING. O atoms in `P_(4)O_(10)`.
Discussion
27.

How many bonds present with carbon and oxygen in CO_(2) ?

Answer»

SOLUTION :In `CO_(20` , there are FOUR BONDS with carbon and TWO bonds with every oxygen. O = C = O
Discussion
28.

How many bridged carbonyl groups (CO) present in Fe_(2)(CO)_(9)

Answer»


SOLUTION :
Discussion
29.

How many blocks are present in modern periodic table ?

Answer»

SOLUTION :There are FOUR blocks are PRESENT in MODERN periodic table s, p, d and f.
Discussion
30.

How many benzene rings are there in the structural formula of Napthacene ?

Answer»

5
3
4
2

Solution :
Discussion
31.

How many benzylic hydrogen are present in hydrocarbon given below.

Answer»


SOLUTION :5
Discussion
32.

How many bare added in reduction half reaction of the following redox reaction in basic medium? N_(2)H_(4)+ClO_(3)^(-)toNO+Cl^(-)

Answer»

`8bare`
`6bare`
`5bare`
`4bare`

ANSWER :B
Discussion
33.

How many Balmer lines in the spectrum will be observed when electrons return from 7th shell to 2nd shell ?

Answer»


ANSWER :5
Discussion
34.

How many Balmer lines in the spectrum will be observed when electrons return from 7^(th) shell to 2^(nd) shell ?

Answer»


Solution :
no of SPECTRAL lines due to TRANSITION from `7 to 2 = 5`
Discussion
35.

How many atoms of gold are present in 19.7 kg of gold ? (At omega t of Au=197)

Answer»

`6.022xx10^(24)`
`6.022xx10^(23)`
`6.022xx10^(25)`
`6.022xx10^(21)`

Answer :A::B::C
Discussion
36.

How many atoms of each constituent element are present in 50 g of CaCO_(3) ?

Answer»


Solution :Gram MOLECULAR mass of `CaCO_(3) = 40+12 +3xx16 =100.0g`
100.0 grams of `CaCO_(3)=1` gram mol
50.0 grams of `CaCO_(3) = (50.0)/(100.0) =0.5` gram mol.
One gram mole of `CaCO_(3)` contain Ca ATOMS `= 6.022 xx 10^(23)` atoms
0.5 gram mole of `CaCO_(3)` contain Ca atoms `= 6.022xx10^(23) xx 0.5 = 3.01 xx 10^(23)`
One gram mole of `CaCO_(3)` contain CARBON atoms `= 6.022 xx 10^(23)` atoms
0.5 gram mole `CaCO_(3)` contain carbon atoms `= 3.01 xx 10^(23)` atoms
One gram mole of `CaCO_(3)` contain oxygen atoms `= 3 xx 6.022 xx 10^(23)` atoms
0.5 gram mole of `CaCO_(3)` contain oxygen atoms `= 0.5 xx 3 xx 6.022 xx 10^(23) = 9.03 xx 10^(23)` atoms.
Discussion
37.

How many atoms of fluorine are present in 1.9 xx 10^(-6) gram of fluorine ? The atomic mass of fluroine is 19 amu.

Answer»


SOLUTION :Gram atomic MASS of fluorine = 19.0 G
19.0 gram of fluorine have atoms `= 6.022 xx 10^(23)`
`1.9 xx 10^(-6)` gram of fluorine have atoms `= (6.022xx10^(23)xx(1.9xx10^(-6)g))/((19.0g))=6.022xx10^(16)` atoms.
Discussion
38.

How many atoms can be assigned to its unit cell if an element forms (i)body-centred cubic cell , (ii)a face-centred cubic cell.

Answer»

Solution :Atoms PER unit CELL in a body-centred CUBIC cell =`8xx1/8` (from corners )+ 1 (from body CENTRE )=2
Atoms per unit cell in a face-centred cubic cell=`8xx1/8` (from centres ) + `6xx1/2` (fromface centres ) =4
Discussion
39.

How many atoms are there per unit cell in (i) simple cubic arrangement of atoms, (ii) body centred cubicarrangement of atoms, and (iii) face-centred cubic arrangement of atoms?

Answer»

SOLUTION : (i) :1,(II) :2and(III) :4
Discussion
40.

How many atoms are there in 100 amu of He?

Answer»

Solution :We know that, 1 AMU =x WEIGHT of one 12 C ATOM or weight of one `""^(12)C`atom = 12 amu (at. wt. of C = 12 amu). Similarly, as the atomic weight of He is 4 amu, weight of one He atom = 4 amu.
Thus, the number of atoms in 100 amu of `He = 100/4 = 25`
Discussion
41.

How many atoms are present in one cc of helium gas at STP?

Answer»

SOLUTION :At STP, 22400 CC `=6.022 xx 10^(23)` atoms
At STP, ONE cc=?
Number of atoms present in one cc at STP
`=(6.022 xx 10^(23))/(2.24 xx 10^(4))=2.69 xx 10^(19)`
Discussion
42.

How many atoms are present in 2 grams of calcium? (GAW of Ca is 40g)

Answer»

Solution :40 grams of Ca has `6.022xx10^(23)` atoms
2 grams of Ca has =?
NUMBER of CALCIUM atoms `=(2)/(40)xx6.02xx10^(23)=3.011xx10^(22)`
Discussion
43.

How many are the correct satements among the following? Troposphere is the majar portion of atmosphere. .Stratosphere the region in which mainly ozone laye is present .Sound waves cannot propagate in mesosphere. .In mesosphere temperature falls with an increase in the altitude. . Thermosphere is the region where the temperature increases with increase in altitude. In thermosphere gases ionises by absorbing solar radiations.

Answer»


ANSWER :6
Discussion
44.

How many are more reactive than benzene towards electrophilic substitution? Phenol, Acetanilide, toluene, Benzoic acid, Benzonitrile, Biphenyl

Answer»


SOLUTION :PHENOL, ACETANILIDE, TOLUENE, BIPHENYL
Discussion
45.

how manyangularnode in d_(x) orbitalwhich ?

Answer»

SOLUTION :The nodalplanes `d_(YZ)` and `d_(XZ)`
Discussion
46.

How many alkene on catalytic reduction give normal butane as product. (i). (A)overset(H_(2)//Pt)ton-butene (ii). (B)overset(H_(2)//Pt)to Iso-pentane (iii). (C)overset(H_(2)//Pt)to Neo-pentane (iv). (D)overset(H_(2)//Pt)to Cyclopentane (v).

Answer»


Answer :(i). Cis & trans 2-butene & 1-butene (ii). `C-underset(Cl)underset(|)(C)-C=C" "C-underset(C)underset(|)(C)=C-C" "C-underset(C)underset(||)(C)-C-C`
(iii). Zero (Neo-pentane can not be preprared by catalytic HYDROGENATION of alkene)
(IV). One
(v). Including OPTICAL `(##BSL_CHM_HC_E01_167_A01##)`
Excluding optical=3
Discussion
47.

How many alkenes, alkynes and alkadienes can be hydrogenated to form Isopentane (Including all structural isomers)

Answer»


SOLUTION :`CH_(2)=overset(CH_(3))underset(|)(C)-CH_(2)-CH_(3)``CH_(3)-overset(CH_(3))overset(|)(C)=CH-CH_(2)``CH_(3)-overset(CH_(3))overset(|)(CH)-CH=CH_(2)` ltBrgt `CH_(3)-overset(CH_(3))overset(|)(CH)-C-=CH``H_(2)C=overset(CH_(3))overset(|)(C)-C=CH_(2)``CH_(3)-overset(CH_(3))overset(|)(C)=C=CH_(2)`
Discussion
48.

How many alcohols out of following on dehydration with hot conc. H_(2)SO_(4) will give alkene having 9alphaH as major product.

Answer»


SOLUTION :
Discussion
49.

How many alcohols give immediate turbidity with Lucas reagent having molecular formula (C_(5)H_(12)O)

Answer»

1
2
3
4

Solution :
Discussion
50.

How many acyclic structural isomeric carbonyl compound having molecular formula C_(6)H_(12)O can gives haloform test.

Answer»


SOLUTION :`CH_(2)-OVERSET(O)overset(||)(C)-CH_(2)-CH_(2)-CH_(2)``CH_(3)-underset(O)underset(||)(C)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)`
`CH_(3)-underset(O)underset(||)(C)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)``CH_(3)-underset(O)underset(||)(C)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-CH_(3)`
Discussion