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 final product (Z) in the following sequence of reactions. CH_3NH_2overset(CH_3l" Excess")rarr(X) overset(AgOH)rarr(Y)overset(Delta)rarr(Z)+ CH_3OH

Answer»

`CH_3CH_2CH_2NH_2`
`(CH_3)_3N`
`(CH_3)_2NH`
`(CH_3)_4overset(+)NOH^(-)`

ANSWER :B
Discussion
2.

Identify the final product (Y) in the followingsequence of reactions : H-C-=CH underset(H_(2)SO_(4))overset(HgSO_(4))rarrX underset((2)H_(2)O //H^(+))overset((1)CH_(3)CH_(2)MgBr)rarrY

Answer»

`CH_(3)CH_(2)CH_(2)OH`
`CH_(3)CH_(2)CH_(2)OH`
`CH_(3)-UNDERSET(OH)underset("|")(CH) CH_(2)CH_(3)`
NONE of these

Solution :`underset("Acetylene") ( H-C-=C-H) underset(H_(2)SO_(4)//HgSO_(4))overset(H_(2)O)rarr underset("Acetaldehyde")overset("O")overset("||")(CH_(3)-C-H)underset((2)H_(2)O //H^(+))overset((1)CH_(3)CH_(2)MgBr)rarrunderset(2-"Butanol")overset(OH"")overset("|")(CH_(3)-CH-CH_(2)CH_(3))`
Discussion
3.

Identify the final product in the reaction C_(6)H_(5)-underset(underset(OH)(|))overset(overset(C_(6)H_(5))(|))C-underset(underset(OH)(|))overset(overset(CH_(3))(|))C-CH_(3)underset(Delta)overset(H^(+))rarr?

Answer»

`C_(6)H_(5)-underset(underset(O)(||))C-underset(underset(Me)(|))overset(overset(Me)(|))C-Me`
`C_(6)H_(5)-underset(underset(CH_(3))(|))overset(overset(C_(6)H_(5))(|))C-underset(underset(O)(||))C-CH_(3)`
`C_(6)H_(5)-overset(overset(C_(6)H_(5))(|))C=overset(overset(CH_(3))(|))C-CH_(3)`
Stilbene

Answer :B
Discussion
4.

Identify the final product in the given reaction below … Ca-Salt of adipic acid overset("(i) Heat")underset((ii)Zn-Hg//HCl)rarr Product

Answer»

n-Pentane
Cyclopentene
Cyclopentane
n-Hexane

Answer :C
Discussion
5.

Identify the final product in each reaction.

Answer»

SOLUTION :
Discussion
6.

Identify the FALSE statement.

Answer»

ACTINIDES have oxidation states of `+2` and `+3`.
Zr and Hf OCCUR in nature TOGETHER since their ionic radii are almost same.
The seperation of lanthanides is difficult since the ionic radii of the lanthanides are very CLOSE to each other.
The transition elements exhibit colour as they ABSORB energy for d-p transition.

Answer :D
Discussion
7.

Identify the false statement :

Answer»

The VOLUME of a solution cannot be less than the sum of VOLUMES of the pure SOLVENT and solute used to prepare the solution (binary solution of two liquids)
At constant T and P, `DeltaG_(mix)` will be necessarily negative for an IDEAL solution
An ideal binary solution `(p_A^@!=p_B^@)` cannot form an azeotropic mixture.
In binary solutions ideality is more of an exception rather than a rule

Answer :A
Discussion
8.

Identify the examples of thermoplasticpolymers .

Answer»

polythene
POLYSTYRENE
Polyvinyl
All of these

SOLUTION :Polythene, polystyreneand polyvinyl, all are the EXAMPLES of THERMOPLASTICPOLYMERS.
Discussion
9.

Identify the false characteristic regarding detergents

Answer»

ANIONIC detergents bare SODIUM salts of sulphonated long chain hydrocarbons
In anionic detergents, the cationic part of DETERGENT is involved in the cleansing action
Cationic detergents are quaternary ammonium salts of AMINES with bromides as onins
Liquid DISHWASHING detergents are non-ionic detergents

Answer :B
Discussion
10.

Identify the end product Z in the following sequence C_(6)H_(5)NH_(2) underset(320 K)overset(NaNO_(2)//HCl)(rarr) Xoverset(NaOH (aq))(rarr) Y overset((C_(2)H_(5)I))(rarr) Z

Answer»




Solution :`C_(6)H_(5)NH_(2) underset(320 K)overset(NaNO_(2)//HCL)(rarr) underset(X)(C_(2)H_(5)OH) overset(NaOH)(rarr) underset((Y))(C_(6)H_(5)ONa) overset(C_(2)H_(5)I)(rarr) underset("Phenetole (Z)")(C_(6)H_(5)OC_(2)H_(5))`
Discussion
11.

Identify the endproduct(Y) in thefollowingrectionseries . CH_(3) CN overset( Na + C_(2) H_(5) OH ) toX overset( HNO_(2)) toY

Answer»

`CH_(3)OH`
`CH_(3)OCH_(3)`
`C_(2)H_(5)OH`
`CH_(3)ON = O`

Answer :D
Discussion
12.

Identify the end product (C) underset("excess")overset(CH_(3)l)rarrAunderset(Ag_(2)O)overset("moist")rarrBoverset(Delta)rarrC

Answer»





SOLUTION :
HENCE, (B) is the CORRECT ANSWER.
Discussion
13.

Identify the end product ( E) in the following reaction sequence CH_3-Br overset(KCN)(to) A overset(H_3O^+)(to)Boverset(SOCl_2)(to)C overset(NH_3)underset(Delta)(to) D overset(LiAlH_4)underset(ether)(to) E

Answer»

ETHYL alcohol
Acetamide
Ethyl amine
Acetaldehyde

Solution :Hydrolysis of cyanides in ACIDIC MEDIUM gives carboxylic ACID
Discussion
14.

Identify the electrophile and nucleophile in the following reactions : (a) C_(6)H_(5)N_(2)Cl +KI rarr C_(6)H_(5)I+KCL (b) C_(6)H_(5)N_(2)Cl +C_(6)H_(5)OH rarr C_(6)H_(5)N=N-C_(6)H_(4)OH (c) C_(6)H_(5)N_(2)Cl+CH_(3)OH rarr C_(6)H_(5)OCH_(3) (d) C_(6)H_(5)N_(2)Cl+H_(2)O rarr C_(6)H_(5)OH

Answer»

Solution :(a) `I^(-)-"NUCLEOPHILE"`
(b) `C_(6)H_(5)N_(2)^(+)-"ELECTROPHILE"`
(C) `CH_(3)OH-" nucleophile"`
(d) `H_(2)O-" nucleophile"`
Discussion
15.

Identify the crystal Write the name of the crystal.

Answer»


ANSWER :FACE CENTRED CUBIC CRYSTAL.
Discussion
16.

Identify the electron - deficient species

Answer»

`(BH_(3))_(2)`
`(SiH_(3))_(2)`
`PH_(3)`
`(CH_(3))_(2)`

Answer :A
Discussion
17.

Identify the correct trend given below : ( Atomic no : Ti=22, Cr=24 and Mo=42)

Answer»

`Delta_(0)of [Cr(H_(2)O)_(6)]^(2+) lt[MO(H_(2)O)_(6)]^(2+) and Delta_(0)of [TI(H_(2)O)_(6)]^(+3)lt[Ti(H_(2)O)_(6)]^(2+)`
`Delta_(0)of [Cr(H_(2)O)_(6)]^(2+) gt[Mo(H_(2)O)_(6)]^(2+) and Delta_(0)of [Ti(H_(2)O)_(6)]^(+3)gt[Ti(H_(2)O)_(6)]^(2+)`
`Delta_(0)of [Cr(H_(2)O)_(6)]^(2+) gt[Mo(H_(2)O)_(6)]^(2+) and Delta_(0)of [Ti(H_(2)O)_(6)]^(+3)lt[Ti(H_(2)O)_(6)]^(2+)`
`Delta_(0)of [Cr(H_(2)O)_(6)]^(2+) lt[Mo(H_(2)O)_(6)]^(2+) and Delta_(0)of [Ti(H_(2)O)_(6)]^(+3)gt[Ti(H_(2)O)_(6)]^(2+)`

Answer :D
Discussion
18.

Identify the correct statments (s)

Answer»

Red `P_4` is less valatile than white `P_4`
Red `P_4` is more volatile than white `P_4`
Reducing properties of hypo PHOSPHOROUS ACID is DUE to O H bonds
Hypo phospharic acid has one P - O - P bond

Solution :White phospharousis vey less stable a regular strain, while red phosphorous exists of CHAIN of `P_4` - UNITS so it is more stable and less volatile.
Discussion
19.

Identify the correct statements regarding enzymes.

Answer»

Enzymes are SPECIFIC BIOLOGICAL catalyst than can normally function at very low temperature `(T ~ 100K)`
Enzymes are normally heterogeneous catalysts that are very specific in action
Enzymes are specific biological catalyst that cannot poisoned
Enzymes are specific biological catalystthat posses well defined ACTIVE sites

Solution :N//A
Discussion
20.

Identify the correct statements regarding entropy.

Answer»

At absolute zero temperature, the entropy of all CRYSTALLINE substances is not taken to be zero
At absolute zero temperature, the entropy of a PERFECTLY crystalline SUBSTANCE is positive.
At absolute zero temperature, entropy of a perfectly crystalline substance is taken to be zero.
At `0^@C` , the entropy of a perfectly crystalline substance is taken to be zero.

Solution : This is the statement of third law of thermodynamics. In a perfect crystal, at absolute zero temperature, each constituent of LATTICE must have the lowest energy, so it LEADS to perfect order, therefore, zero entropy.
Discussion
21.

Identify the correct statements from the following (I)In [CoCl(NH_3)_5]^(2+) , the Lewis acid is Co^(3+) (II)An example for heteroleptic complex is [Co(NH_3)_6]^(3+) (III)The hybridisation of Mn in [MnBr_4]^(2-) is dsp^2 (IV)In [Ni(CO)_4] , the metal-carbon bond possesses sigma and pi character

Answer»

I,ii,III,iv
I,iv
ii,iii
I,iii,iv

Answer :B
Discussion
22.

Identify the correct statements from the following a) Dichloromethane is used as a solvent b) Freons are used for refrigeration c) C CI_4 causes depletion of ozone layer d) Electrophilic substitution reactions haloben zenes occur faster than those of benzene

Answer»

B, C, d 
c, d 
a, b, c 
a, c

Answer :C
Discussion
23.

Identify the correct statements for the behaviour of ethane-1, 2-diamine as a ligand :

Answer»

It is a netural ligand
It is a didentate ligand
It is a chelating ligand
It is a UNIDENTATE ligand

Answer :A::B::C
Discussion
24.

Identify the correct statements for the behaviour of ethane-1, 2-diamine as a ligand.

Answer»

It is a NEUTRAL LIGAND
It is a didentate ligand
It is a chelating ligand
It is a UNIDENTATE ligand

Answer :A::B::C
Discussion
25.

Identify the correct statements among the following I) The transition elements have partially filled (n-l) d orbitals. II) Cu is a better conductor of electricity than that of Ag. III) Sc^(+3), zn^(+2)are diamagnetic whereas Ti^(+4) is paramagnetic. IV) Transitional elemelilts are less electro-positive than alkalimetals

Answer»

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

Solution :I,III only
Discussion
26.

Identify the correct statements among the following I) Cr in first series of d-block has highest oxidation state. II) Colour of MnO_(4)^(-) is due to charge transfer phenomenon. III) Zn can show variable oxidation state. IV) Ferromagnetism disappears in the solution of Fe

Answer»

All
I & II only
II & IV only
II & III only

Answer :C
Discussion
27.

Identify the correct statements among the following I) Both Cr and Cu show +1 oxidation state II) The complementary colour of absorbed green colour of visible radiation is purple. III) Ni^(+2) ion in its hydrated state exhibits green colour IV) Devarda's alloy contains least percentage of 'Zn

Answer»

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

Answer :A
Discussion
28.

Identify the correct statements among the followingI) Both Cr and Cu show +1 oxidation stateII) The complementary colour of absorbed green colour of visible radiation is purple.III) Ni^(+2) ion in its hydrated state exhibits green colourIV) Brass is an alloy of copper

Answer»

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

Answer :A
Discussion
29.

For a good quality cement,the ratio of silica (SiO_2) to alumina (Al_2O_3) is between :-

Answer»

1.5 - 2.5
2.5 - 4.0
3.0 - 4.5
2.0 - 3.5

Answer :B
Discussion
30.

Identify the correct statement(s)

Answer»

SERIES limit of paschen series in `Li^(2+)` ion is 13.6 eV
Wave number of last line of Balmer series in `He^(+)` ion is 'R' (R-Rydberg constant)
Maximum value of (n+l) in `._24Cr` is 5
Different types of orientation in space for 'f' orbital is 5

Solution :(A)Series limit of paschen series of `Li^(2+)=13.6xx3^2/3^2=13.6 eV`
(B)`(BARV)` of last line of Balmer series =`R/2^2xx2^2=R`
(C )In the comfiguration of `._24 Cr` there is '3d' HENCE maximum value of 'n+l' is 5
(D)Different types of orientation in space=(2l+1).So for 'f' orbitals l=3 and no of orientation =(2 X 3+ 1)=7
Discussion
31.

Identify the correct statement (s) with respect to the following reaction. 2Na[Al(OH)_(4)]_((aq)) + CO_(2(g)) rarr Al_(2)O_(3).xH_(2)O_((s)) + 2NaHCO_(3(aq)) (i) CO_(2) is acting as a reducing agent. (ii) The solution is neutralised by passing CO_(2) gas to form hydrates Al_(2)O_(3) precipitate. (iii) Insoluble sulphate is converted into soluble sulphate. (iv). The precipitate is filtered off and heated around 1670 K to get pure Alumina.

Answer»

only ii
Only (iv)
both (ii) & (iv)
both (i) and (III)

ANSWER :C
Discussion
32.

Identify the correct statement(s)?

Answer»

Ozone is a powerful OXIDISING agent as COMPOUND to dioxygen
Ozone reacts with KOH and gives an orange COLOURED solid `KO_(3)`
there is a decrease in volume when ozone DECOMPOSED to form `O_(2)`
The decomposition of `O_(3)` to `O_(2)` is exothermic

Answer :A::B::D
Discussion
33.

Identify the correct statement with respect to the following reaction. Zn_((s)) + 2[Au(CN)_(2)]_((aq))^(-) rarr [Zn(CN)_(4)]_(2(aq))^(-) + 2Au_((s)) (a) The above reaction takes place in extraction of zinc (b) Gold is reduced to its elemental state (c ) The process is called ammonia leaching. (d) The above reaction is an example of cyanide leaching.

Answer»

III & IV
II & IV
Only I
I, II, III & IV

Answer :B
Discussion
34.

Identify the correct statements:

Answer»

Fluroine is a super halogen
iodine SHOWS lewis basic nature
AgF is insoluble in WATER
`SCN^(-)` is a pseudohalide

Solution :Fluorine is the most reactive AMONG all halogens hence, called superr halogen. Basic character increases DOWNWARD.
Discussion
35.

Identify the correct statements :

Answer»

IRON is the most abundant transition metal
Cast iron is the PUREST form of iron
The most stable oxidation state of iron is +3
Iron does not form AMALGAM with mercury

Solution :wroughtIron is purest form of Iron
Discussion
36.

Identify the correct statement regarding Vangerwaal gas.

Answer»

For He gas at room temperature under normal conditions attractive forces dominate.
For COMPRESSIBILITY factor `(Z) lt 1`, repulsive forces dominate.
If `(z) gt 1`, it means gas will be less compressible.
A real gas BEHAVE ideally at high pressure and low temperature.

Solution :(1) For He, `(z) gt 1`
(2) ATTRACTION forces dominates.
(4) For a real gas at hight pressure and low temperature, `(z) gt 1`
Discussion
37.

Identify the correct statement (s).

Answer»

free neutron can be a `beta` EMITTER
For an endothermic reaction equilibrium constant increases with increase in TEMPERATURE
If `DeltaH_(RXN)^(@)` does not vary with temperature then `DeltaS_(Rxn)^(@)` will also be temperature independent
The correct graph of RATE constant us temperatureas per Arrhenius equation is given by

Answer :A::B::C::D
Discussion
38.

Identify the correct statement regarding enzymes:

Answer»

Biological enzymes are specific biological catalysts that can NORMALLY FUNCTION at very high temperature `(T ~~1000K)`
Enzymes are normally heterogeneous catalysts that are very specific in action
Enzymes are specific biological catalysts that cannot be poisoned
Enzymes are specific biological catalysts that possess well define ACTIVE sites.

Answer :D
Discussion
39.

Identify the correct statement regarding entropy

Answer»

At `0^(@)C`, the entropy of a perfectly crystalline substance is taken to be zero
At absolute zero of TEMPERATURE, the entropy of a perfectly crystalline substance is +ve
At absolute zero of temperature, the entropy of all crystalline substance is taken to be zero
At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero

Solution :This is the STATEMENT of third LAW of thermodynamics.
Discussion
40.

Identify the correct statement regarding a spontaneous process

Answer»

For a spontaneous PROCESS in an isolated system, the CHANGE in entropy is positive
Endothermic process are NEVER spontaneous
Exothermic process are always spontaneous
Lowering of ENERGY in the reaction process is the only criterion for SPONTANEITY

Solution :For a spontaneous process in an isolated system, the change in entropy is positive.
Discussion
41.

Identify the correct statement regarding a spontaneous process :

Answer»

Endothermic processes are never spontaneous.
EXOTHERMIC processes are ALWAYS spontaneous.
Lowering of ENERGY in the reaction PROCESS is the only criterion for spontaneity.
For a spontaneous process in an isolated system, the change in entropy is positive.

ANSWER :D
Discussion
42.

Identify the correct statement in the following:

Answer»

DIMETHYL ether and ethanol are chain isomers.
Ethanoic ACID and methyl methanoate are position isomers.
n-butane and isobutane are FUNCTIONAL isomers.
Propan-l-ol and propan-2-ol are position isomers.

Solution :`underset("ether")("Functional isomers"): underset(underset("(alcohol)")("Dimethyl ether"))(CH_(3)-O-CH_(3)), underset("Ethanol")(CH_(3)CH_(2)OH)`
Functional isomers: `underset(underset("(Carboxylic acid)")("Ethanoic acid"))(CH_(3)COOH)`, `underset(underset("(ester)")("Methyl methanoate"))(H-overset(O)overset(||)C-OCH_(3))`
Chain isomers: `underset("n-Butane")(CH_(3)-CH_(2)-CH_(2)-CH_(3))`, `underset("Isobutane")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(3))`
Position isomers: `underset("Propan-1-ol")(CH_(3)-CH_(2)-CH_(2)-OH)`, `underset("Propan-2-ol")(CH_(3)-underset(OH)underset(|)(CH)-CH_(3))`
Discussion
43.

Identify the correct statement fromt the following in a chemical reaction

Answer»

The entropy always increases
The change in entropy along with SUITABLE change in enthalpy DECIDES the FATE of a reaction
The enthalpy always decreases
Both the enthalpy and the entropy remains constant

Solution :`DeltaG=DELTAH-TDeltaS`
For a reaction to be spontaneous `DeltaG` should be negative, Thus `DeltaS` and `DeltaH` decides the fate of a reaction.
Discussion
44.

Identify the correct statement in a chemical reaction-

Answer»

the entropy always increases
the change in entropy along with suitable change in enthalpy decides the rate of REACTION
the enthalpy always decreases
both the enthalpy and the entropy REMAINS constant

Solution :For a reaction occurring at a constant TEMPERATURE and pressure, `DELTAG lt 0,` i.e., `DeltaH-TDeltaS lt0`. So, the change in entropy `(DeltaS)` along with the change in enthalpy `(DeltaH)` determines the SPONTANEITY of a reaction.
Discussion
45.

Identify the correct statement from the options given below for the galvanic cell :

Answer»

Cathode in a voltaic cell LOOSE weight during reaction
`Delta G` is positive for spontaneous cell reaction in voltaic cell
The voltaic cell is WORKING in REVERSE direction if the e.m.f of a cell is negative
The cell reaction is spontaneous in galvanic cell if `E_("cell")`is less than external potentialapplied in cell

Solution :This option is CORRECT statement if the emf. of a voltaic cell is negative, it means emf is positive for reverse reaction and reverse reaction is spontaneous, and cell is working in reverse direction.
Discussion
46.

Identify the correct statement from the following in a chemical reaction

Answer»

The entropy always increases.
The change in entropy along with suitable changein enthalpy DECIDES the fate of a REACTION.
The enthalpy always decreases.
Both the enthalpy and the entropy remains constant.

Solution :`DELTA G = Delta H- T Delta S`
For a reaction to be spontaneous `Delta G`should be NEGATIVE. Thus `Delta S` and `Delta H`decides the fate of a reaction.
Discussion
47.

Identify the correct statement for SO_(3) (g) hArr SO_(2) (g) + (1)/(2) O_(2) (g)

Answer»

On increasing TEMPERATURE at equilibrium, reaction will move in BACKWARD direction
On increasing PRESSURE reaction will move in backward direction
Catalyst will alter equilibrium concentration of REACTANTS and products
both (1) and (2) are correct

Answer :B
Discussion
48.

Identify the correct statement, from below concerning the structure of CH_(2) = C = CH_(2).

Answer»

The molecule is planar.
ONE of the THREE carbon atoms is in a `sp^(3)`-hybridised state.
The molecule is non-planar with the two - `CH_(2)`groups being in planar perpendicular to each other.
All thc carbon atoms are sp-hybridised.

Answer :C
Discussion
49.

Identify the correct statement for the adsorption of areal gas on charcoal at 1 atm, 15^@C.

Answer»

Decrease in pressure increases the extent ofadsorption
Gases which are easily liquefiable, are adsorbed more in QUANTITY
Gases which have a behaviour similar to an inertgas are adsorbed more
None of these

Solution :The amount of gas adsorbed by a solid depends on the nature of gas. In general , more easily liquefiable gases (i.e., higher CRITICAL TEMPERATURE) are readily adsorbed as VAN der WAALS. forces are stronger near the critical temperature .
Discussion
50.

Identify the correct statement for change of Gibb's energy for a system (DeltaS_("system")) at constant temperature and pressure

Answer»

If `DeltaG_("SYSTEM")=0`, the system is still MOVING in a particular
If `DeltaG_("system") lt 0`, the PROCESS is not SPONTANEOUS
If `DeltaG_("system") gt 0`, the process is spontaneous
If `DeltaG_("system") = 0`, the system has ATTAINED equilibrium

Answer :D
Discussion