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.

For which reaction change of entropy will be positive?

Answer»

`H_2(g) + I_2(g) IFF 2HI(g)`
`HCl(g) + NH_3(g) iff NH_4Cl(s)`
`NH_4NO_3(s ) iff N_2O(g) + 2H_2O`
`MGO(s) + H_2(g) iff Mg(s) + H_2O (l)`

Solution : Entropy of gas is greater than that of liquid and SOLID. In option (c) solid is converted into gaseous PHASE, therefore, in this reaction change of entropy will be POSITIVE.
Discussion
2.

Sulpha drugs are used for

Answer»

PRECIPITATING bacteria
Removing bacteria
Decreasing the SIZE of bacteria
Stopping the GROWTH of bacteria

Answer :D
Discussion
3.

For which order reaction a straight line is obtained along with x-axis by plotting a graph between half life (t_(1//2)) and initial concentration 'a'

Answer»

1
2
3
0

Solution :It is the GRAPH of FIRST ORDER .
Discussion
4.

For which ore of the metal, froth floatation process is used for concentration ?

Answer»

Horn silver 
Bauxite 
CINNABAR 
Haematite 

ANSWER :C
Discussion
5.

For which onethe following reaction Delta Sis positive

Answer»

`2Zn_((s)) +O_(2(g))to 2 ZnnO_((s))`
`2C_((S)) +O_(2(g))to2CO_((g))`
`2CO_((g)) +O_(2 (g) )to2CO_(2(g))`
`4Al_((s)) +3O_(2(g))to 2Al_2 O_(3(s))`

ANSWER :B
Discussion
6.

For which order of the reactions, the units of the rate constant are independent of the concentration?

Answer»

SOLUTION :For first order REACTION (UNIT = `SEC^(-1)`)
Discussion
7.

For which pair iodoform test cannot be used as distinction test:

Answer»

Propanol-1 and propanol-2
Butanol-2 and 2-methylpropan-2-ol
Butanol-1 and butanol-2
Pentanol-1 and pentanol-3

Answer :D
Discussion
8.

Forwhichone of thefollowinngreactionDelta Gdecreases withincreasingthe temperature

Answer»

`2Zn_((s)) +O_(2(g))to 2 ZnnO_((s))`
`2CO_((g)) +O_(2 (g))to2CO_(2(g))`
`2C_((s)) +O_(2 (g)) to2CO_((g))`
`4Cu_((s))+O_(2(g))to2Cu_(2) O_((s))`

ANSWER :C
Discussion
9.

For which one of the following sets of four quantum numbers, an electron will have the highest energy?

Answer»

`{:(,N,l,m,s),("(a)",3,2,1,1//2):}`
`{:(,n,l,m,s),("(b)",4,2,-1,1//2):}`
`{:(,n,l,m,s),("(c)",4,1,0,1//2):}`
`{:(,n,l,m,s),("(d)",5,0,0,-1//2):}`

SOLUTION :The sub-shell are 3d, 4d, 4p and 4s, 4d has HIGHEST energy as n + I VALUE is maximum for this.
Discussion
10.

For which one of the following reactions K_(p)=K_(c)

Answer»

`N_(2)+3H_(2)hArr2NH_(3)`
`N_(2)+O_(2)hArr2NO`
`PCl_(5)hArrPCl_(3)+Cl_(2)`
`2SO_(3)2SO_(2)+O_(2)`

ANSWER :B
Discussion
11.

Forwhichoneof thefollowingreaction, thegraphofDelta GagainstTisalmosthorizontalto temperatureaxis

Answer»

`C_((s)) +O_(2(g)) to CO_(2(g))`
`2C_((s)) +O_(2(g)) to2CO_((g))`
`CO_((g)) +O_(2(g))to 2CO_(2 (g))`
`3Mg_((s)) +O_(2 (g))to2MgO_((s))`

ANSWER :A
Discussion
12.

For which one of the following properties of halogens the sequence F gt Cl gt Br gt I holds good

Answer»

ELECTRON AFFINITY
Electronegativity
Atomic radius
Boiling POINT

ANSWER :B
Discussion
13.

For which one of the following polling is used ?

Answer»

REDUCING METAL oxide
Oxidising metal to oxide
Oxidising impurities
Recuding metal sulphate to metal sulphide

Solution :Polling forms carbon COMPOUNDS to give C and COfor reduction
Discussion
14.

For which one of the following, observed magnetic moment is less than calculated magnetic moment(The experimental data are mainly for hydrated ions in solution)?

Answer»

`CU^(2+)`
`Ti^(2+)`
`V^(2+)`
`Cr^(2+)`

SOLUTION :N//A
Discussion
15.

For which one of the following, observed magnetic moment is more than calculated magnetic moment (The experimental data are mainly for hydrated ions in solution)?

Answer»

`CU^(2+)`
`TI^(2+)`
`V^(2+)`
`CR^(2+)`

Solution :N//A
Discussion
16.

For which one of the following ions, the colour is not duo to a d-d transition :

Answer»

`CrO_4^(2-)`
`CU(NH_3)_4^(2+)`
`TI(H_2O)_6^(3+)`
`COF_6^(3-)`

Answer :A
Discussion
17.

For which one of the following equations is DeltaH_("react")^(@) equal to DeltaH_(f)^(@) for the product

Answer»

`2CO(g)+O_(2)(g)rarr2CO_(2)(g)`
`N_(2)(g)+O_(3)(g)rarrN_(2)O_(3)(g)`
`CH_(4)(g)+2Cl_(2)(g)rarrCH_(2)Cl_(2)(l)+2HCl(g)`
`Xe(g)+2F_(2)(g)rarrXeF_(4)(g)`

Solution :Both Xe and `F_(2)` are gaseous elements at `25^(@)C` and in their standard states and form `XeF_(4(g))` HENCE`DeltaH_((f))^(@)=DeltaH_("react")^(@)`
Discussion
18.

For which one of the following equations is Delta_(r) H^(theta) equal to Delta_(f)H^(theta) for the product ?

Answer»

`N_(2)(G) + O_(3)(g) RARR N_(2)O_(3)(g)`
`CH_(4)(g) + 2Cl_(2)(g) rarr CH_(2)Cl_(2)(g) + 2HCl(g)`
`Xe(g) + 2F_(2)(g) rarr XeF_(4)(g)`
`2CO(g) + O_(2) rarr 2CO_(2)(g)`

Answer :C
Discussion
19.

For which on of the following ions the colour is not due to a d-d transition.

Answer»

`CrO_(4)^(2-)`
`CU(NH_(3))_(4)^(2-)`
`TI(H_(2)O)_(6)^(3+)`
`CoF_(6)^(3-)`

Answer :A
Discussion
20.

For which of the processes is DeltaS negative

Answer»

`H_(2)(g) rarr 2H(g)`
`N_(2)(g)1atm rarr N_(2)(g) 8 atm`
`2SO_(3)(g) rarr 2SO_(2)(g) + O_(2)(g)`
`C_(("diamond")) rarr C_(("graphite"))`

Solution :Processes (a) and (c ) take palce with the increase of no. of MOLES of GASEOUS species and hence the DISORDER or entropy increases. (b) on increasing pressure, disorder or RANDOMNESS DECREASES and so also the entropy (d) is endothermic process and `DeltaS` is positive.
Discussion
21.

For which of the followng d^(n) configuration complexes, can not exist in both high spin and low spin forms: (I) d^(3) (II) d^(5) (III) d^(6) (IV) d^(8)

Answer»

I, II & III
II, III & IV
I & IV
none of these

Solution :Octahedral complexes having metal cation with `d^(3)^(8)` configuration can not be DEFINED iin terms of high and LOW spin complex.
Discussion
22.

For which of the following Vitamin, Liver is not a source ?

Answer»

`B_(2)`
H
`B_(12)`
`B_(6)`

SOLUTION :`B_(6)`
Discussion
23.

For which of the following species, the expression for the energy of electron in nth orbit (E_(n)=-(13.6Z^(2))/(n^(2))eVatom^(-1)) has the validity?

Answer»

`He^(2+)`
`LI^(2+)`
Deuterium
Tritium

Solution :`Li^(2+)` D and T are ONE ELECTRON SPECIES. `He^(2+)` has no electron.
Discussion
24.

For which of the following types of ions the no. of unpaired e in octahedral complexes fixed at the same no. as in the free ion no matter how weak or strong the crystal field is ?

Answer»

`d^(3)`
`d^(4)`
`d^(5)`
`d^(6)`

Solution :Distribution in strong FIELD `1.2Delta_(0)`
Distribution in WEAK field `1.2Delta_(0)`
Discussion
25.

For which of the following species, Bohr theory does not apply?

Answer»

H
`H^(+)`
`He^(+)`
`LI^(2+)`

ANSWER :B
Discussion
26.

For which of the following sparingly soluble salt, the solubility(S) and solubility product (K_(sp)) are related by the expression S = (K_(sp)//4)^(1//3)

Answer»

`BaSO_(4)`
`Ca_(3)(PO_(4))_(2)`
`Hg_(2)Cl_(2)`
`Ag_(3)PO_(4)`

Solution :`BaSO_(4) hArr BA^(2+) + SO_(4)^(2-) , K_(sp) = S^(2), S = sqrt(K_(sp))`
`Ca_(3)(PO_(4))_(2) hArr 3Ca^(2+) + 2PO_(4)^(3-), K_(sp) = (3S)^(3) xx (2S)^(2) = 108 S^(5)`
`:. S = ((K_(sp))/(108))^(1//5)`
`Hg_(2)Cl_(2) hArr Hg_(2)^(2+) + 2Cl^(-), K_(sp) = S xx (2S^(2)) = 4S^(3)`
`:. S = ((K_(sp))/(4))^(1//3)`
`Ag_(3)PO_(4)rarr 3Ag^(+) + PO_(4)^(3-), K_(sp) = (3S)^(3)xx S = 27 S^(4)`
`:. S = ((K_(sp))/(27))^(1//4)`
`CuS hArr Cu^(2+) + S^(2-), K_(sp) = S^(2), S = sqrt(K_(sp))`.
Discussion
27.

For which of the following reactions will the equilibrium mixture contain an appreciable concentration of both reactants and products ? (a) Cl_(2)(g)hArr 2Cl (g) ,K_(c) = 6.4 ×x 10^(-39) (b) Cl_(2)(g)+2NO (g)hArr 2NOCl(g),K_(c)= 3.7 x×10^(8) (c) Cl_(2)(g)+2NO_(2) (g)hArr2NO_(2)Cl (g),K_(c) = 1.8

Answer»


ANSWER :C
Discussion
28.

For which of the following reactions the value of K_p is greatier than K_c ?

Answer»

`N_2+O_2 HARR 2NO`
`2SO_2+O_2 harr 2SO_3`
`2SO_2 harr N_2O_4`
`PCL_5 harr PCL_3+CL_2`

ANSWER :D
Discussion
29.

For which of the following reactions, the degree of dissociation cannot be calculated applying the formula: alpha=(dt-d_(0))/((n-1)d_(0))

Answer»

`PCl_(5)hArrPCl_(3)+Cl_(2)`
`2NH_(2)hArrN_(2)+3H_(2)`
`2HIhArrH_(2)+I_(2)`
`2KClO_(3)hArr2KCl+3O_(2)`

ANSWER :C
Discussion
30.

Forwhich of the following reactions K_(p)=K_(c)

Answer»

<P>`2NOCl(G)hArr2NO(g)+Cl_(2)(g)`
`N_(2)(g)+3H_(2)(g)hArr2NH_(3)(g)`
`H_(2)(g)+Cl_(2)(g)hArr2HCl(g)`
`N_(2)O_(4)(g)hArr2HCl(g)`

Solution :`K_(p)=K_(c)(RT)^(DELTAN),Deltan=2-2=0`
Discussion
31.

For which of the following reactions, K_(p)=K_(c)?

Answer»

`H_(2(G))+I_(2(g))iff2HI_((g))`
`2N_(2)O_(4(g))iff4NO_(2(g))`
`N_(2(g))+3H_(2(g))iff2NH_(3(g))`
`H_(2(g))+Cl_(2(g))iff2HCl_((g))`

Answer :A::D
Discussion
32.

For which of the following reactions, Kp=Kc?

Answer»

`2NOCl_((g)) harr 2NO_((g))+Cl_(2(g))`
`N_(2(g))+3H_(2(g)) harr 2NH_(3(g))`
`H_(2(g))+Cl_(2(g)) harr 2HCl_((g))`
`N_2O_(4(g)) harr 2NO_2`

ANSWER :C
Discussion
33.

For which of the following reactions is a combination of high pressure and high temperature helpful in obtaining a high yield of products ?

Answer»

`2NF_(3)(g)rarr N_(2)(g)+3F_(2)(g)-54.40`Kcal
`N_(2)(g)+3H_(2)(g)rarr 2NH_(3)(g)+22.08`Kcal
`Cl_(2)(g)+2O_(2)rarr 2ClO_(2)(g)-49.40`Kcal
`2Cl_(2)O_(7)(g)rarr 2Cl_(2)(g)+7O_(2)(g)+126.8`Kcal

Answer :C
Discussion
34.

For which of the following reactions does the equlibrium constant depend on the units of concentration

Answer»

`NO"_((g))hArr1/2N_(2(g))+1/2O_(2(g))`
`ZN_((s))+CU_((aq))^(2+)hArrCu_((s))+Zn_((aq))^(2+)`
`C_(2)H_(5)OH_((1))+CH_(3)COOH_((1))hArrCH_(3)COOC_(2)H_(5(1))+H_(2)O_((1))` (Reaction CARRIED in an inert SOLVENT)
`COCl_(2(g))hArrCO_((g))+Cl_(2(g))`

Solution :`Deltan=1` for this change
So the equlibrium constant depends on the unit of concentration.
Discussion
35.

for which of the following reactions DeltaH is less thanDeltaE ?

Answer»

`HCl(aq)+ NaOH(aq) to NaCl(aq)+ H_(2)O(l)`
`H_(2)(g)+ l_(2)(g)to 2Hl(g)`
`C(s) + O_(2)(g) to CO_(2)(g)`
`N_(2)(g) +3H_(2)(g) to 2NH_(3)(g)`

SOLUTION :For `N_(2)(g)+3H_(2)(g)to2NH_(3)(g)`
` HENCE , Deltan=-2`
`DeltaHlt DeltaE`
Discussion
36.

For which of the following reactions DeltaS is negative ?

Answer»

`Mg_((s)) + Cl_(2(G)) rarr MgCl_(2(s))`
`H_(2)O_((I)) rarr H_(2)O_((g))`
`CaCO_(3(s)) rarr CaO_((s)) + CO_(2(g))`
`I_(2(g)) rarr 2I_((g))`

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

For which of the following reactions DeltaH is equal to DeltaU ?

Answer»

`2HI(G) HARR H_(2)(g)+I_(2)(g)`
`2NO_(2)(g) hArr N_(2)O_(4)(g)`
`N_(2)(g)+3H_(2)(g) hArr 2NH_(3)(g)`
`2SO_(2)(g)+O_(2)(g) hArr 2SO_(3)(g)`

SOLUTION :`Deltan_(g)=0`
Discussion
38.

For which of the following reactions, DeltaH = DeltaU ?

Answer»

`H_2(G) + l_2(g) RIGHTARROW 2Hl(g)`
`N_2(g) + 3H_2(g) rightarrow 2NH_3(g)`
`C(s) + H_2O(g) rightarrow CO(g) + H_2(g)`
`CH_4(g) + H_2O(g) rightarrow CO(g) + 3H_2(g)`

ANSWER :A
Discussion
39.

For which of the following reactions average molar mass at any progress of reaction can not be 60 gm/mole.

Answer»

`SO_(3) (G) RARR SO_(2) (g) + (1)/(2) O_(2) (g)`
`N_(2)O_(4) (g) rarr 2NO_(2) (g)`
`Cl_(2) (g) rarr 2Cl (g)`
`2 NH_(3) (g) rarr N_(2) (g) + 3H_(2) (g)`

SOLUTION :`{:(2NH_(3) (g),rarr,N_(2) (g),+,3H_(2) (g),),(1,,0,,0,),(1 - 2x,,x,,3x,):}`
`M_(avg) = ((1 - 2x) 17 + x (28) + 3x xx 2)/(1 + 2x) = 60`
`17 = 60 + 120 x`
x will be -ve which is not possible
Discussion
40.

For which of the following reactions, Delta S is not positive ?

Answer»

`I_(2)(s) rarr I_(2)(g)`
`CUO(s) + H_(2)(g) rarr CU(s) + H_(2)O(L)`
`2O_(3)(g) rarr 3O_(2)(g)`
`CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + H_(2)O(g)`

Answer :B
Discussion
41.

For which of the following reactions, Delta H is equal to Delta U ?

Answer»

`N_(2)(g) + 3 H_(2)(g) RARR 2 NH_(3)(g)`
`PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`
`2 H_(2)S(g) + 3 O_(2)(g) rarr 2 H_(2)O(L) + 2 SO_(2)(g)`
`C(s) + O_(2)(g) rarr CO_(2)(g)`.

Answer :D
Discussion
42.

For which of the following reactions, Delta H is greater than Delta U ?

Answer»

`N_(2)(G) + 3 H_(2)(g) rarr 2 NH_(3)(g)`
`CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l)`
`PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`
`HCl(aq) + NaOH(aq) rarr NACL(aq) + H_(2)O(aq)`

Solution :`Delta H = DeltaU +Delta n_(g)` RT. For this reaction,
`Delta n_(g) =2-1=1`
`:. Delta H gt Delta U`
Discussion
43.

For which of the following reaction ,Oswald.s isolation method is useful for determination of order of the reaction?

Answer»

`N_(2)O_(5(g))to2NO_(2(g))+(1)/(2)O_(2(g))`
`H_(2)O_(2(l))toH_(2)O_(l)+(1)/(2)O_(2(g))`
`-(K)/(2.303)BrO_(3(aq))^(-)+6H_((aq))^(+)to3Br_(2(aq))+3H_(2)O_((l))`
All the three GIVEN options

Answer :C
Discussion
44.

For which of the following processes, entropy change is negative?

Answer»

EVAPORATION of water
Sublimation of camphor
Condensation of IODINE VAPOUR
MELTING of ice

Answer :D
Discussion
45.

For which of the following parameters the structural isomers C_(2)H_(5)OH and CH_(3)OCH_(3) would be expected to have the same values (Assume ideal behaviour)

Answer»

Boiling points
Vapour PRESSURE at the same temperature
Heat of vaporization
Gaseous densities at the same temperature and pressure

Solution :Gaseous density of both ethanol and dimethyl ether would be same under identical CONDITION of temperature and pressure while the rest of these three properties vapour, boiling point and heat of vaporization will DIFFER as ethanol has hydrogen bonding WHEREAS ethers does not.
Discussion
46.

For which of the following processes, enthalpy change is positive

Answer»

`F(g)+e^(-) to F^(-)(g)`
`Cl(g)+e^(-) to Cl^(-)(g)`
`O(g)+2e^(-) to O^(2-)(g)`
`H(g)+e^(-) to H^(-)(g)`

Solution :Gaining of an electron by a gaseous ATOM is usually an exothermic process. GAIN of second electron by NEGATIVELY CHARGED species feels a strong repulsion and the ENERGY of the system increases.
Discussion
47.

For which of the following parameters the structural ismers C_(2) H_(5)OH and CH_(3) OCH_(3) would be expected to have the same values ? (Assume ideal behaviour)

Answer»

Boiling points
Vapour pressure at the same temperature
Heat ofvapourization
GASEOUS densities at the same temperature and pressure

Solution :Gaseous densities of ethanol and dimethyl ETHER would be same at same temperature and pressure. The heat of vaporisation, V.P. and b. pt. will differ DUE to H BONDING in ethanol.
Discussion
48.

For which of the following parameters, the structural isomers C_2H_5OH and CH_3 OCH_3 would be expected to have the same values ? (Assume ideal behaviour )

Answer»

Heat of VAPORIZATION
Gaseous denstities at the same TAMPERATURE and pressure
Boiling POINTS
VAPOUR pressure at the temperature

Answer :B
Discussion
49.

For which of the following paparmeters, the structural isomers C_(2)H_(5)OH and CH_(3)OCH_(3) would be expected to have the same values ?

Answer»

Boiling points
Vapour pressure at the same TEMPERATURE
Heat of vporization
GASEOUS desities at the temperature and pressure.

Solution :Gaseous densityes will be the same as they have the same MOLAR MASS.
Discussion
50.

For which of the following pairs of compounds are the correct notations given?

Answer»




ANSWER :B::C::D
Discussion