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.

Identify the incorrect statement among the following ?

Answer»

Sublimation and crystallisation techniques are for purification of solid organic compounds
Chromato GRAPHY technique works on different EXTENTS of adsorption of a substances on an adsorbent surface
Water (B.pt `100^(@)C`) and ANOTHER miscible liquid Z(B.pt `105^(@)C`) mixture can be separated by fractional distillation.
Phenol (B.pt `182^(@)C`) and Aniline (.pt `184^(@)C`) mixture can be separated by simple distillation.

Solution :If B.P. difference is less than `40^(@)C`, then liquid mixture is separated by fractional distallation.
Discussion
2.

Identify the incorrect statement among the following .

Answer»

ENTROPY `ds=dq_("rev")//T`
`DeltaS` is maximum for a reversible process
Entropy is a measure of randomness
Entropy of PURE crystal is zero

Answer :B
Discussion
3.

Identify the incorrect statement about a compound .

Answer»

A molecule cannot be SEPARATED into its constituent elements by physical METHODS of separation
A molecule of a compound has ATOMS of different elements
A compound retains the physical properties of its constituent element
The RATIO of atoms of different elements in a compound is fiexed

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

Identify the incorrect statement about a compound.

Answer»

A MOLECULE cannot be separated into its CONSTITUENT ELEMENTS by physical methods of separation
A molecule of a COMPOUND has ATOMS of different elements
A compound retains the physical properties of its constituent element
The ratio of atoms of differentelements in a compound is fixed

Answer :A::C::D
Discussion
5.

Identify the incorrect statement.

Answer»

Graphite is thermodynamically most stable ALLOTROPE of carbon.
Other forms of ELEMENTAL carbon like COKE, carbon black, charcoal are IMPURE forms of graphite
All allotropes of carbon have thermodynamically different stability.
Charocal and coke are obtained by heating wood in ABSENCE of air.

Solution :Charcoal is obtained from wood while coke is obtained from coal.
Discussion
6.

Identify the incorrect statement :

Answer»

Li is the hardest ELEMENT AMONG IA group elements
Cs has high melting POINT among IA group elements
The hydration capacity of `Ba^(2+)` ion is more than `Mg^(+2)` ion.
IIA group elements are harder that IA group elements.

Solution :B) Among the IA group elements Li has ligh melting point
C) Hydration capacity is more for `Mg^(+2)` ion than `Ba^(+2)` ion, due to its small size
Discussion
7.

Identify the incorrect match

Answer»

1-I
2-II
3-III
4-IV

Solution :`n=1 , 2, 3 ……., L = 0 , 1 ,….. ""n-1`
Discussion
8.

Identify the hydrocarbon having molecular formula C_(5)H_6 which gives white ppt with ammonical AgNO_(3)?

Answer»




ANSWER :A
Discussion
9.

Identify the incorect statement

Answer»

PLANTS and sea water are RECEPTORS of `CO_(2)`
Microorganism ACTS as sink for dead plants and animals.
Methyl ISOCYANATE and DDT are contaminants.
Pb, Hg, `CO_(2) and SO_(2)` are pollutants

Answer :A
Discussion
10.

Identifythe groupand valencyof the elementhavingatomicnumber119. Alsopredicttheoutermostelectronicconfigurationand writethe general formula ofitsoxide .

Answer»

SOLUTION :The presentset up ofthe Longformof the periodictablecanaccommodateat themaximum118elementselectron will enter 8S-orbital.As suchits outermost electronicconfigurationwill be `8s^(1)`.Sinceit has onlyoneelectronin the valenceshell i.e.,8sthereforeits valencewill be 1 andit will LIE in group 1 ALONG withalkalimetals of theformulaof itsoxidewill be `M_(2)O`whereM representsthe element.
Discussion
11.

Identify the gas which is readily adsorbed by activated charcoal

Answer»

`N_(2)`
`SO_(2)`
`H_(2)`
`O_(2)`

Solution :A gas which is easy to liquify is most READILY adsobed. Thus out of the given FOUR choices `SO_(2)` will be most readily adsorbed.
Discussion
12.

Identify the functional groups in the following compounds:

Answer»

Solution :

Therfore the UNSATURATED nitro GROUP in which `-NO_(2)` (nitro) and C=C (alkene) group
Discussion
13.

Identify the four quantum number values for 4d_(x^2 - y^2) electron are ……………….. .

Answer»

`4,2-2,+1/2`
`4,0,0,+1/2`
`4,3,2,+1/2`
`4,3,2,-1/2`

SOLUTION :4,2, -2 + `1/2`
Discussion
14.

Identify the four digit number abcd if it is equal to sum of code numbers of all those processes in which Delta S gt 0. [For example if only process P1 satisfies the condition then fill 0035 if both P1 and P6 satisfy then fill 0046.]

Answer»


ANSWER :163
Discussion
15.

Identify the following: Na_(2)CO_(3)overset(So_(2))rarr A overset(Na_(2)CO_(3))rarr B overset("Elementals")underset(Delta)rarr C overset(I_(2))rarr D Also mention the oxidation state of S in all the compounds.

Answer»

Solution :`Na_(2)CO_(3)+2SO_(2)+H_(2)O rarr 2NaHSO_(4)+CO_(2)`
`2NaHSO_(3)+Na_(2)CO_(3)rarr 2Na_(2)S_(2)O_(3)`
`2Na_(2)S_(2)O_(3)+I_(2)overset(Delta)rarr Na_(2)S_(4)O_(6)+2NaI`
Oxidation states of sulphur:
a. `NaHSO_(3)=1+1+x-6=0, :. X=4`
b. `Na_(2)SO_(3)=2+x-6=0, :.x=4`
c. `Na_(2)S_(2)O_(3)` (Sodium THIOSULPHATE)
Average oxidation numer.
`Na_(2)S_(2)O_(3)=2xx1+2x+3(-2)=0`
`:. x= +2`
But oxidation NUMBER of `S= +2` is wrong because both the S atom cannot be in same oxidation state as is evident form the fact what `Na_(2)S_(2)O_(3)` is treated with dil `H_(2)SO_(4)`, one S atom gets precipitated while the other gets converted into `SO_(2)`. The oxidation numbers of these two S atom can, however, be determined by the chemical bonding method. By chemical bonding method, the structure of `Na_(2)S_(2)O_(3)` is `Na^(o+)O^(Θ)-overset(S)overset(uarr)underset(O)underset(||)S-O^(Θ)Na^(o+)`
SINCE there is a coordinate bond between two S atoms. Therefore, the acceptor S atom has an oxidation number of `-2`. The oxidation number of other S atoms can be calculated as follows:
`underset(("For Na"))(2xx(-1)) + underset(("For O atoms"))(3xx(-2)) + x + underset(("For coordinate S atom"))(1XX(-2)=0)`
OR
`+2-6+x-2=0, x= +6`
Thus, the two S atoms in `Na_(2)S_(2)O_(3)` have oxidation number of `-2` and `+6`.

d. Structure of tetrahionate ion is
`Na^(o+)O^(Θ)-overset(O)overset(||)underset(O)underset(||)(S^(+5))-S^(0)-S^(0)-overset(O)overset(||)underset(O)underset(||)(S^(+5))-O^(Θ)Na^(o+)`
Since each of the two terminal S atoms is connected to two oxygen atoms by a double bond and one oxygen atom by a single bond, therefore, the oxidation state of each of these terminal S atoms is `+5`. Since two central S atoms are linked to each other by a single bond, each S is further attached to similar species on either side, the electron pair formaing the `S-S` bond remains in the center and hence each of the two central S-atom has an oxidation state of zero. Therefore, oxidation number of two S-atoms are `(+5 and 0)`. However, the average oxidation state of the four S atoms is
2 S atoms in `+5` oxidation state and 2 S atoms in zero oxidation state.
`:. ((2xx5)+(2xx0))/(4)=2.5`
Discussion
16.

Identify the following as covalent, ionic or interstitial hydrides CaH_2,LaH_2,TiH_2,NaH,GeH_2,NH_3

Answer»

Solution :COVALENT hydries : `GeH_2,NH_3`
IONIC HYDRIDES : `CaH_2,NAH`
Interstitial hydrides : `TiH_2,LaH_2`
Discussion
17.

Identify the final product (B) in the following reaction.

Answer»




ANSWER :A
Discussion
18.

Identify the final product CH_(2)=CH_(2)overset(O_(2), Ag)rarr(X) underset("Steam")overset(473 K)rarrY

Answer»

Ethanol
Ethanal
Epoxyethane
Ethylene glycol

Solution :
Discussion
19.

Identify the final product

Answer»

`C_(6)H_(5)-underset(O)underset(||)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)`
`H_(5)C_(6)-underset(CH_(3))underset(|)overset(C_(6)H_(5))overset(|)C-underset(O)underset(||)C-CH_(3)`
`C_(6)H_(5)-overset(C_(6)H_(5))overset(|)C=overset(CH_(3))overset(|)C-CH_(3)`
NONE of these

Solution :Stability of carbocation (PINACOLONE rearrangement)
Discussion
20.

Identify the final product

Answer»

`Ph- OVERSET(OH)overset(|)CH-overset(O)overset(||)C-OK`
`Ph-CH_(2)-overset(O)overset(||)C-OH`
`Ph-overset(O)overset(||)C-overset(O)overset(||)C-H`

Solution :` X=Ph-overset(O)overset(||)C-overset(O)overset(||)C-H`FOLLOWED by CANNIZARO REACTION.
Discussion
21.

Identify the element that has the following electronic configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^ 4d^10 5p^6 6s^2 4f^2

Answer»

BA 
At 
CE 
PR 

ANSWER :C
Discussion
22.

Identify the element which can have highest oxidation numbers

Answer»

N
O
Cl
C

Answer :C
Discussion
23.

Identify the element of group 16th and 4th period.

Answer»

Se
As
Po
Te

Solution :BASED on PERIODIC table.
Discussion
24.

Identify the electrophilic centre in the following compound &CH_(3)-CH=O, CH_(3),CN,CH_(3)I.

Answer»

Solution :`CH_(3)-UNDERSET(BAR)CH=O,CH_(3)-underset(bar)C-=N " and underset(bar)(C)H3-I`, the underlined carbon atoms are electrophilic centres as they will have partial positive CHARGE due to polarity of the C-O or C-N or C-I BOND .
Discussion
25.

Identify the correct statemtn with referece to the given rection P_(4)+3OH^(-)+3H_(2)OrarrPH_(3)+3H_(2)PO_(2)^(-)

Answer»

<P>

Solution :Writing the O.N of each element above its symbbol we have
`P_(4)^(0)+3OH^(-)+3H_(2)OrarrPH_(3)+3H_(2)PO_(2)^(-)`
In this reaction O.N of P increses FORM 0 in `P_(4)` to +1 in `H_(2)PO_(2)^(-)`and decrease to -3in `PH_(3)` therefore P has undergone both oxidation as wellas reduction thus option (a) and (b) are wrong and option (c ) is correct further O.N (d) id correct in other WORDS option (c ) and (d) are correct
reduction thusoption (d) is correct in other words option(c ) and (d) are correct
Discussion
26.

Identify the correctly matched set among the following

Answer»

SCANDIUM -d-block -REPRESENTATIVE element
Lanthanum d-block -INNER transition element
Cerium - F- block -transition element
Actinium-d-block-transition element

Answer :D
Discussion
27.

Identify the correct statements with reference to the given reaction P_(4)+3OH^(-)+3H_(2)OtoPH_(3)+3H_(2)PO_(2)^(-)

Answer»

Phosphorus is undergoing reduction only.
Phosphorus is undergoing OXIDATION only.
Phosphorus is undergoing oxidation as well as reduction.
HYDROGEN is undergoing neither oxidation nor reduction.

Solution :`overset(0)(P_(4))+overset(-2)(3O)overset(+1)(H^(-))+overset(+1)(3H_(2))overset(-2)(O)tooverset(-3)(P)overset(+1)(H_(3))+overset(+1)(3H_(2))overset(+1)(PO_(2)^(-))`
Oxidation number of Hydrogen is (+1) so (D) is correct.
Oxidation number of P is 0 into -3 and (+1) so ( C) is right
Discussion
28.

Identify the correct statement(s) with respect to the following reaction : Zn+2HCI to ZnCI_2 +H_2 (i) Zinc is acting as an oxidant (ii) Chlorine is acting as a reductant (iii) Hydrogen is not acting as an oxidant (iv) Zn is acting as a reductant

Answer»

only (II)
only (IV)
both (ii) and (III)
both (i) and (i)

Discussion
29.

Identify the correct statements regarding the structure of Al(BH_(4))_(3)

Answer»

Alluminium is `sp^(2)d^(2)` and BORON is `sp^(3)` hybridised
It has 6 3C. 2e bonds
It has 6 Al - H - B bonds
It has 6 2C - 2e bonds

Solution :
Discussion
30.

Identify the correct statement(s) in relation to the following reaction ? Zn+2HCl toZnCl_(2)+H_(2)

Answer»

Zinc is ACTING as an oxidant.
Chlorine is acting as a reductant
Hydrogen ion is acting as an oxidant.
Zinc is acting as a reductant.

Solution :`overset(0)(Zn)+overset(+1)(2H)overset(-1)(Cl) tooverset(+2)(Zn)overset(-1)(Cl_(2))+overset(0)(H_(2))`
(A) Oxidation number of Zn increases so it ACTS as a reducing agent.
(B) Oxidation number of chlorine is not CHANGE.
( C) Hydrogen reduces +1 to 0, so it acts as an oxidising agent.
(D) Oxidation of Zn occurs so, it acts as a reducing agent.
Discussion
31.

Identify the correct statement(s) in the following ?

Answer»

Acid rain is mostly because of oxides of nitrogen and sulphur.
Chlorofluorocarbons are RESPONSIBLE for ozone layer depletion
Greenhouse effect is responsible for global warming
Ozone layer does not permit infrared RADIATIONS from the SUN to reach the EARTH.

ANSWER :A::B::C
Discussion
32.

Identify the correct statements among the folowing I) At equilibrium, change in entropy for a process, DetlaS = 0 II) Temperature is an extensive property III)For a cyclic process DeltaU != 0 IV)During free expansion of a gas under reversible or irreversible condition Delta W = 0

Answer»

I & II 
I & IV 
II & III 
I & III 

ANSWER :C
Discussion
33.

Identify the correct statement(s) from the following?

Answer»

Benzene when treated with propyl chloride in presence of anhydrous `AlCl_3` gives Cumene as the major product
Benzene when treated with propionyl chloride in presence of anhydrous `AlCl_3` to givepropiophenone, which on reduction with Zn(Hg)/CONC. HCl to GIVE n-propyl benzene.
Toluene reacts with Br, in sun light to give p-bromo toluene, while in presence of `FeBr_3` it givesBenzyl bromide
Benzene when oxidised with `V_2O_5`at 770K forms maleic anhydride

Solution :In option C, reverse is correct. In presence of sunlight SUBSTITUTION takes PLACE in the side CHAIN, while in the benzene ring in presence of `FeBr_3`
Discussion
34.

Identify the correct statements about barium. (i) It shows photoelectric effect (ii) It is silvery white metal (iii) It forms Ba(NO_3)_2 which is used in preparation of green fire

Answer»

Both (i) and (III)
(II) and (iii)
only ii
(i), (ii), (iii)

ANSWER :B
Discussion
35.

Identify the correct statements.

Answer»

Lead forms compounds in `+2` OXIDATION state DUE to INERT pair effect 
All halogens FORM only negative oxidation 
CATENATION property increases from boron to oxygen. 
Oxygen oxidation state is `-1` in ozonides.

Answer :A
Discussion
36.

Identify the correct statement (s) in relation to the following reaction : Zn+2HCIrarrZnCI^(2)+H_(2)

Answer»

Phosphorus is UNDERGOING REDUCTION only
Phosphorus is undergoing oxidation only
PHOSPHOURUS isundergoing oxidation as well as reduction
Hydrogen is undergoing neither oxidation nor reduction

Solution :are both CORRECT
Discussion
37.

Identify the correct statement (S) in relation to the following reaction : Zn+2HCIrarrZnCI_(2)+H_(2)

Answer»

Solution :Writing the O.N of each element above its symbols we have
`Zn+2HCIrarr Zn CI_(2)+H_(2)`
(a) The O.N of Zn increases FORM 0 in Zn to +2 in`Zn CI_(2)` therefore Zn acts as a REDUCTANT thus option
(c ) is not CORRECT
(b) The O.N of CI does not change therfore it neither acts as a reductant nor an oxidant therefore option (b) is not correct
(c ) The O.N of H decreae from +1 in `H^(+)` to 0 in `H_(2)` therefore `H^(+)` acts an oxidant thus option (c ) is correct (d) As explained in option (a) Zn acts as a reductant therefore it cannot act as an oxidant Thus option (c ) and (d) are correct
Discussion
38.

State whether given statement is true or false :- H_2O is non-polar solvent.

Answer»
Discussion
39.

Identify the correct statement regarding enzymes.

Answer»

ENZYMES are specific biological catalysts that can normally FUNCTION at very high TEMPERATURE (`T~1000K`)
Enzymes are specific biological catalyst that posses well defined active sites.
Enzymes are specific biological catalysts that cannot be poisoned.
Enzymes are normally heterogeneous catalysts that are very specific in their action.

Solution :Enzymes are specific biological catalyst that POSSESS well defined active sites.
Discussion
40.

Identify the correct statement regarding effect of Cl atom bonded to the carbon atom adjacent toa carbocation carbon ?

Answer»

It has no effect on the stability of the CARBOCATION
It destabilizes the carbocation
It stabilitizes the carbocation
Cannot PREDICT its effect on the carbocation from the given information.

Answer :B
Discussion
41.

Identify the correct statement in the following :

Answer»

acid rain is mostly because of oxides of nitrogen and SULPHUR
chlorofluorocarbons are responsible for ozone layer depletion
greenhouse effect is responsible for global warming
ozone layer does not permit infrared radiation from the sun to reach the earth

ANSWER :B::C::D
Discussion
42.

Identify the correct statement from the following I) Graphite is used as dry lubricant, as it posses slippary nature II) Diamond is thermodynamically more stable than graphite III) Carbon black, coke, charcoal are impure forms of graphite or fullerenes IV) Diamond is measured in carats and one carat is 200 gm.

Answer»

I, III only 
II, IV only 
I, II, III 
II, III, IV 

ANSWER :A
Discussion
43.

Identify the incorrect statement with reference to Bentham and Hookers system

Answer»

If `Delta G _("system") lt 0,` the process is not spontaneous,
`If Delta G _("system") gt 0,` the process is not spontaneous.
`If Delta G _("system") =0,` the system has ATTAINED EQUILIBRIUM
If `Delta G _("system") =0,` the system is still MOVING in a particular direction.

ANSWER :C
Discussion
44.

Identify the correct statement about MnO_(2)//Delta

Answer»

`C_(6)H_(5)-CHOH-CH_(3)` as well as `CH_(3)-CH=CH-CH_(2)OH` are oxidised
`C_(6)H_(5)-CH_(2)-CH_(2)-OH` as well as `CH_(2)=CH-CH_(2)-CH_(2)-OH` are oxidised
`C_(6)H_(5)-CHOH-CH_(3)` is not oxidised but `CH_(3)-CH=CH-CH_(2)-OH` is oxidised.
`C_(6)H_(5)-CHOH-CH_(3)` is oxidised but `CH_(3)-CH=CH-CH_(2)OH` is not oxidised.

Answer :A
Discussion
45.

identify the correct statement.

Answer»

Elemental sodium can be reprared and isolated by electrolysing and aqueous solution of NaCl
Elemental NA is a stong oxidising agent
Element Na is insoluble in `NH_(3)`
Element Na is easily oxidised

Solution :Because of its low ionisation energy, elemental Na LOSES its VALENCE s-electron easily and undrgoes oxidation.
Discussion
46.

Identify the correct statement

Answer»

Elemental sodium can be PREPARED and isolated by electrolysing an aqueus SOLUTION of NaCl
Elemental Na is a strong oxidising agent
Elemental Na is insoluble in `NH_(3 )`
Elemental Na is EASILY oxidised 

Answer :D
Discussion
47.

Identify the correct statement :

Answer»

Pure `H_(2)O_(2)` is weakly acidic
Aq`H_(2)O_(2)` is neutral towards LITMUS
In ALKALINE solution `H_(2)O_(2)`is a DISPROPORTION ation reaction .
DECOMPOSTION of `H_(2)O_(2)` is a disproportionationreaction.

Answer :ABCD
Discussion
48.

Identify the correct statement-

Answer»

Quantum numbers (N,l,m,s) are obtained arbitrarily
all the quantum numbers (n,l,m,s) for any pair of electrons in an ATOM can be identical under special circumstance
All the quantum numbers (n,l,m,s) MAY not be REQUIRED to describe an electron of an atom completely
all the quantum numbers (n,l,m,s) are required to describe an electron of an atom completely.

Answer :D
Discussion
49.

Identify the correct set from the following for fundamental particles The correct match is

Answer»

`I-c, II-a, III-d, IV-a`
`I-c, II-a, III-a, IV-a`
`I-c, II-d, III-B, IV-a`
`I-c, II-b, III-d, IV-a`

ANSWER :B
Discussion
50.

Identify the correct set from the following for fundamental particles The correct match is

Answer»

I-c, II-a, III-d, IV-a
I-c, II-a, III-a, IV-a
I-c, II-d,III-B, IV-a
I-c, II-b, III-d, IV-a

Answer :B
Discussion