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.

What do you mean by ozone hole? What are its consequences?

Answer»

SOLUTION :Depletion of ozone LAYER creates some sort of holes in the blanket of ozone which SURROUNDS us in the atmosphere and this is known as ozone hole.
(i) With the depletion of the ozone layer, UV radiations filters into the troposphere which leads to ageing of SKIN, cataract, sunburn, skin cancer etc.
(ii) By killing many of the phytoplanktons, it can damage the fish productivity.
(III) Evaporation rate increases through the surface and stomata of leaves which can decrease the moisture content of the soil.
Discussion
2.

Whatis not same in ._(17)^(35) CI and ._(17)^(37) CI ?

Answer»

ELECTRON
Proton
NEUTRON
Nucleon

Answer :C
Discussion
3.

Which of the following is//are matched properly ?

Answer»

`H_(2)O_(2)+2OH^(-)to2H_(2)O+O_(2)+2e^(-)` …….. REDUCING property in alkaline medium
`H_(2)O_(2)to2H^(+)+O_(2)+2e^(-)`……. Property in ACIDIC medium
`H_(2)O_(2)+2H^(+)+2e^(-)to2H_(2)O`……oxidising property in acidic medium
`H_(2)O_(2)toH_(2)O+O`….. Potential equation in alkaline medium

Answer :A::B::C::D
Discussion
4.

Which of the following indicates the isotherm?

Answer»

a, d 
a, C 
B, d 
b, c 

ANSWER :B
Discussion
5.

Write the K_p and K_c for the following reactions. (i) 2SO_(2)(g)+ O_(2)(g) hArr 2 SO_(3)(g) (ii) 2CO(g) hArr CO_(2) + C(s)

Answer»

Solution :`K_(c) = ([SO_3]^2)/([SO_2]^2[O_2]), K_p = (P_(SO_3)^(2))/(P_(SO_2)^2 . PO_(2))`
(ii) C(s) has CONTANT concentration
`K_(c)= ([CO_2])/([CO]^2) , K_p = (P_(CO_2))/(P_(CO)^(2))`
Discussion
6.

Which one of the wrong statement

Answer»

The uncertainty principle is `DeltaE xx Deltat ge h//4pi`
Half FILLED and fully filled orbitals have GREATER stability due to greater exchange energy, greater symmetry and more balanced arrangement.
The energy of 2s orbital is less than the energy of 2p orbital in case of HYDROGEN like atoms
de-Broglies's wavelength is given by `lambda=h/(mv)`, where m= MASS of the particle, v=group velocity of the particle

Solution :In H-like atom energy of 2s = 2p . Orbital incorrect statement is (c )
Discussion
7.

When 0.1 mole of BaCl_(2) is treated with 0.5 mole of Na_(3)PO_(4), the maximum number of moles of Barium phosphate formed is

Answer»

0.25
0.033
0.283
0.33

Answer :B
Discussion
8.

Which of the following statements is wrong ?

Answer»

Ozone is not responsible for greenhouse effect.
Ozone can oxidise sulphur DIOXIDE present in the atmosphere to sulphur trioxide
Ozone HOLE is thinning of ozone layer present in stratosphere.
Ozone is PRODUCED in upper stratosphere by the ACTION of UV rays on oxygen

Solution :Ozone is one of the greenhouse gases
Discussion
9.

Write the expression of K_(p) for the reaction. N_(2)O(g)hArr2NO_(2)(g)

Answer»

<P>

Solution :`K_(p)=((P_(NO_(2))))/((P_(N_(2)O_(4))))`
Discussion
10.

Which is more acidic, acetylene or benzene?

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SOLUTION :Acetylene is more ACIDIC than BENZENE as
`CH -= C^(Theta)` is more stable than
Discussion
11.

Which oxide of nitrogen is not common pollutant ?

Answer»

`NO_(2)`
`N_(2)O_(5)`
NO
`N_(2)O`

ANSWER :B
Discussion
12.

The reddish brown coloured gas formed when nitric oxide is oxidised by air is

Answer»

`N_(2)O_(5)`
`N_(2)O_(4)`
`NO_(2)`
`N_(2)O_(3)`

Solution :`2NO+O_(2)to2NO_(2)`
Discussion
13.

Write two uses of PCBs.

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SOLUTION :(i) As a FERTILIZER (II) As a DETERGENT in CLEANING
Discussion
14.

Write self ionization reaction and ionic product of water.

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Solution :The self-ionization REACTION of water at `25^@C` is as FOLLOWING.
`H_2O_((l)) + H_2O_((l)) HARR H_3O_((AQ))^(+) + OH_((aq))^(-)`
`K_w=[H_3O^+][OH^-]=1.0xx10^(-14)`
Discussion
15.

Which of the following reactions result in the formation of conjugated diene?

Answer»

TREATING vinyl BROMIDE with `(CH_2=CH)_2` CuLi
Treating ALLYL chloride with Na/ether
Treating 4-chlorocyclohexanol with alc.KOH
Heating n-butane with `Al_2O_3// Cr_2O_3`

Solution :d is 1,3-butadiene
Discussion
16.

Which of the following molecule(s) does not have existence?

Answer»

`Ibr_(7)`
`PH_(5)`
`SH_(6)`
`BI_(3)`

Answer :A::B::C
Discussion
17.

Two substances when separated on the basis of partition coefficient between two liquid phases, the technique is known as

Answer»

Column CHROMATOGRAPHY
PAPER chromatography
GLC
TLC

Solution :In paper chromato GRAPHY, both MOVING and stationary phase are liquid.
Discussion
18.

Which one of the following statement is is incorrect

Answer»

`H_(2)` REACTS with `Cl_(2)` to form HCl, an electron pair SHARED between H and Cl
Hydrogen is REDUCED by sodium to formNaH. An electron is transferred from H to Na
Hydrogen reduces COPPER (II) oxide to copper and itself GETS oxidized to `H_(2)O`
Hydroformylation of olefins yields aldehyde which further undergoes reduction to give alcohol.

Answer :B
Discussion
19.

What atoms are indicated by the following eletronic configurations ? (i) 1s^(2) 2s^(2) 2p^(1)(ii) [Ar] 4s^(2) 3d^(1)

Answer»

Solution :(i) Total number of electrons in `1s^(2) 2s^(2) 2p^(1) =2+2+1=5 :.` Atomic number of the element `=5` Hence, the element is Boron (B)
(II) Total number of electrons in `[AR] 4s^(2) 3D^(1)=18+2+1=21 :.` Atomic number of the element `=21` Hence, the element is Scandium (SC)
Discussion
20.

What are fumes? Give one example.

Answer»

Solution :Fumes are one of the non-viable particulate pollutants air. They are obtained by condensation of VAPOURS released during SUBLIMATION, DISTILLATION, boiling and calcination. For example, ORGANIC solvents, metals and metallic oxides form fume particles.
Discussion
21.

Which would you expect to have a higher melting point, magnesium oxide or magnesium fluoride? Explain your reasoning.

Answer»

Solution :(i) Magnesium OXIDE has very strong ionic bonds as compared to magnesium fluoride.
(ii) `Mg^(2+) and O^(2-)` have charges of +2 and -2, respectively.
(iii) Oxygen ion is smaller than fluoride ion.
(iv) The smaller the ionic radii, the smalller the bonds LENGTH in MGO and the bond is STRONGER than `MgF_(2)`.
(V) Due to more strong bond nature in MgO, it has high melting point than `MgF_(2)`
Discussion
22.

What is the ratio of the Rydberg constant for helium to Hydrogen atom?

Answer»

`1//2`
`1//4`
`1//8`
`1//16`

SOLUTION :`R=(-2pi^(2)mZ^(2)E^(4))/(CH^(3))`
`(R_(He))/(R_(H))=(2xx2^2)/(1xx1^(2))=8`
`therefore(R_(H))/(R_(He))=(1)/(8)`.
Discussion
23.

Which elements are consider as alkaline earth metals? Give brief about them.

Answer»

Solution :The group-2 ELEMENTS comprise beryllium, magnesium, calcium, STRONTIUM, barium and radium. They follow alkali METALS in the PERIODIC table.
These (except beryllium) are known as alkaline earth metals. The first element beryllium differs from the rest of the members and shows diagonal relationship to ALUMINIUM.

`*ppm (part per million), ** Percentage by weight
Discussion
24.

When trans-2-butane reacts with Br_2//C Cl_4, X number of products are formed. Whereas when trans-2-butene reacts with HBr Y number of products are formed . Report your answer as Y X .

Answer»


ANSWER :A::B
Discussion
25.

Write two uses of green chemistry in routine life.

Answer»

Solution :(1) For drycleaning of cloths.
(2) For the bleaching of PAPER.
(3) In the synthesis of chemical.
Discussion
26.

When bauxite powder is mixed with coke and reacted with nitrogen at 2075 K, carbon monoxide and X are formed. What is the gas formed when X is reacted with water ?

Answer»

`NH_(3)`
`N_(2)`
`N_(2)O`
`O_(2)`

SOLUTION :When bauxite mixed with coke is heated in an atmosphere of `N_(2)` at 2075 K. AIN is formed. AIN reacts with WATER to give `NH_(3)`
`Al_(2)O_(3) + 3C + N_(2) rarr 2AIN + 3CO uarr`
`AIN + 3H_(2)O rarr Al(OH)_(3)+NH_(3)`
Discussion
27.

What sorts of informations can you draw from the following reaction ? (CN)_(2(g))+2OH_((g))^(-)toCN_((aq))^(-)+CNO_((aq))^(-)+H_(2)O_((l))

Answer»

Solution :Oxidation number of C in `(CN)_(2),CN^(-)andCNO^(-)` is given below :

In a given reaction oxidation number of C is DIFFERENT.
`overset(+3)((CN))_(2(g))+2OH_((g))^(-)tooverset(+2)(CN_((AQ))^(-))+overset(+4)(CNO_((aq))^(-))+H_(2)O_((l))`
In a disproportionation reaction an element in one oxidation state is simultaneously oxidised and reduced. So, we can say that dissolution of cyanide in basic medium is DISPROPORTIONATE reaction.
Discussion
28.

What are free radical initiators?

Answer»

Solution :The types of reagents that PROMOTE homolytic cleavage in substrate are CALLED as free radical initiators. They are short LIVED and are HIGHLY REACTIVE.
Discussion
29.

Which is a bigger ion among Na^(+), F^(-), O^(2-) and Mg^(2+)? Why?

Answer»

SOLUTION :`O^(2-)` is BIGGER ion AMONG the given four. Among isoelectronic IONS, the more the negative CHARGE on the ion, the more its size.
The order is `O^(2-) gt F^(-) gt Na^(+) gt Mg^(2+)`
Discussion
30.

Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.

Answer»

Solution :`""_(12)MG=2,8,2" "therefore` Lewis symbol = Mg.
`""_(11) N_(a) = 2,8,1" "therefore` Lewis symbol = Na
`""_(5)B = 2,3" "therefore` Lewis symbol `= *overset(*)(B*)`
`""_(8)O = 2,6""therefore`Lewis symbol `= : overset(* *)B:`
`""_(7)N = 2,5" "therefore`Lewis symbol `= : UNDERSET(*)overset(*)N*`
`""_(35)Br = 2,8, 18, 7" "therefore` Lewis symbol `= :underset(* *)overset(* *)Br`
Discussion
31.

Write the conjugate acids for the following Bronsted bases : NH_2^(-) , NH_3 and HCOO^-.

Answer»

Solution :Conjugate acid =BASE + `H^+`
The conjugate acid should have ONE extra PROTON and +1 CHARGE them base.
Conjugate acid of`NH_2^(-) =(NH_2^(-) + H^+) = NH_3`
Conjugate acid of `NH_3=(NH_3+H^(+))=NH_4^(+)`
Conjugate acid of `HCOO^(-) = (HCOO^(-) + H^+)` =HCOOH
Discussion
32.

When the resonance structure represented ?

Answer»

SOLUTION :(i) If MOLECULE has alternate MULTIPLE BOND
(ii) The atom which has double bond possess lone PAIR
Discussion
33.

What is the principle of distillation?

Answer»

Solution :EVERY pure LIQUID has a definite BOILING POINT
Discussion
34.

Which of the following statements is correct regarding ease of dehydration ?

Answer»

Primary `GT` Secondary
Secondary `gt` Tertiary
Tertiary `gt` Primary
None

Solution :`3^(@) gt 2^(@) gt 1^(@)` on the basis of stability of carbonium ion formed.
Discussion
35.

What product(s) wouldyou expect from the following solvolysis ?

Answer»

SOLUTION :We OBSERVE that this cyclohexyl bromide is tertiary, and therefore in methanol it should lose a bromide ion to FORM a tertiary carbocation. Because the carbocation is trigonal planar at the positive CARBON, it can react with a solvent molecule (methanol) to form two PRODUCTS.
Discussion
36.

Which of the following reaction is/are correct ?

Answer»


`CH_(3)-C-=N overset(LiAlH_(4))underset(H_(2)O)toCH_(3)-CH_(2)-NH_(2)`

Answer :A::B::C::D
Discussion
37.

The volutme of oxygen liberated from 15 ml of 20 volume is

Answer»

250 ml
300 ml
150 ml
200 ml

Solution :1 ml ----- 20 ml
15 ml ----------?
VOLUME `=20 times 15=300ml`
Discussion
38.

Which is the pH of 10^(-8) M NaOH from 8.0, 6.0 and 7.05 ? Why ?

Answer»

SOLUTION :NaOH is BASE. So the pH of BASIC solution is more than 7.0. So it is 7.05 and POH = 6.95.
Discussion
39.

The total no. of pi electrons present in the benzene are

Answer»

SOLUTION :`(3PI " BONDS")`
Discussion
40.

Which of the following molecules have zero dipole moment ? cis-1,2-dichloroethene, trans-1,2-dichloroethene, 1,1-dichloroethene, trans-2-pentene, cis-2-pentene, 1-butyne, 2-butyne , trans-2-butene, cis-2-butene.

Answer»


SOLUTION :THREE , trans-1,2-dichloroethene, trans-2-butene, 2-butyne.
Discussion
41.

What are oxidation and reduction organic reactions? Give an example.

Answer»

SOLUTION :Oxidation reaction : Most of the oxidation reaction of organic compounds involves GAIN of oxygen or loss of hydrogen.
E.g. : `underset("(acetaldehyde)")(CH_3CHO) underset(H^+ |K_2Cr_2O_7)OVERSET((O))to underset("(Acetic ACID)")(CH_3COOH)`
REDUCTION reactions : Most of the reduction of organic compounds involves gain of hydrogen or loss of oxygen.
Discussion
42.

Which of the following represents aromatic alcohol?

Answer»

Phenol
Cresol
2-Phenylethanol
Quinol

Solution :
Discussion
43.

What happens when sodium carbonate undergoes hydrolysis?

Answer»

Solution :Sodium carbonate is a salt of a strong base like NaOH and WEAK acid like `H_(2) CO_(3), Na_(2) CO_(3)`
undergoes hydrolysis in water to form an alkaline solution.
`Na_(2) CO_(3) + H_(2) O to H_(2) CO_(3) + NaOH`
Discussion
44.

What is the maximum number of orbitals that can be identified with the following quantum number n = 3, I = 1, m = 0.

Answer»

1
2
3
4

Solution :It is 3P ORBITAL with MAGNETIC Q.N=0
So it should be `3P_(Z)`
Discussion
45.

Write the structure of cis and trans isomer of But-2-ene.

Answer»

SOLUTION :
Discussion
46.

What happens when HCOOH is heated at 373K with conc. H_2SO_4 ?

Answer»
Discussion
47.

What volume of 0.2 M Ba( MnO_(4))_2solution is required for complete oxidation of 25 gm of 89.6% pure Fe Co, in acidic medium according to the reaction MnO_(4)^(-) +FeCr_(2)O_(4) rarrFe^(+3) +Cr_(2)O_(7)^(2-)+Mn^(+2)

Answer»

700 ml
175 ml
350 ml
200 ml

Solution : No of MILLI equivalents of `BA(MnO_(4))_(2)`= No, of milli equivalents of `FeCr_(2)O_(4)`
n-factor of `Ba(MnO_(4))_(2) = 10`
n-factor of `FeCr_(2)O_(4)= 7 `
`:. V xx0.2xx10=(25xx89.6xx10^(3))/(100xx((224)/7))`
`:. V=350 ml`
Discussion
48.

Which has more surface tension from the following ? (i) H_(2)O (ii) Soap

Answer»

SOLUTION :Surface tension of SOAP solution is less than `H_(2)O` because solubility INCREASES, surface tension increases.
Discussion
49.

Ultraviolet radiation is absorbed by

Answer»

exosphere
ionosphere
ozonosphere
stratosphere

Answer :D
Discussion
50.

Which of the following reacts with nitrogen when heated in air Anomalous propaerrties

Answer»

Al
C
Na
K

Answer :1
Discussion