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.

The strongest acid among the following is

Answer»




SOLUTION :
Discussion
2.

Which of the following is indicated by the magnetic quantum number ?

Answer»

Size
Orbital sphape
Spatial orientation
Spin

Answer :C
Discussion
3.

Which one used instead of CFC in refrigerator ?

Answer»

1, 1, 2, 2 Tetrachloroethane
Chloroform
1, 1, 1, 2 Tetrachloroethane
`C Cl_(4)`

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

What happens when diborane reacts withair ?

Answer»

SOLUTION :DIBORANE burns in oxygen liberating an enormous amount of ENERGY.
`B_(2) H_(6(g)) + 3O_(2(g)) to B_(2)O_(3(g))+3H_(2)O_((I))`
Discussion
5.

The size of particulates of H_2SO_4 fog lies in the range

Answer»

5-100 NM
100-500 nm
500-1000 nm
1000-10,000 nm

Answer :C
Discussion
6.

What is the DeltaS^(@) for the reaction in cal if the graph of ln K vs 1//T is as follows.

Answer»


Solution :INTERCEPT of lnk vs `(1)/(T)=(DELTAS^(@))/(R)`
`1=(DeltaS^(@))/(R)` `:. DELTA S^(@)=2`cal
Discussion
7.

The r.m.s. velocity of hydrogen is sqrt(7) times the r.m.s. velocity of nitrogen. If T is the temperature of the gas,

Answer»

`T(H_(2))=T(N_(2))`
`T(H_(2))=SQRT(7)T(N_(2))`
`T(N_(2))=2T(H_(2))`
`T(N_(2))=sqrt(7)T(H_(2))`

Solution :`u=sqrt((3RT)/(M)),(u(H_(2)))/(u(N_(2)))=sqrt((T(H_(2)))/(M(N_(2)))xx(M(N_(2)))/(T(N_(2))))`,
`sqrt(7)=sqrt((T(H_(2)))/(T(N_(2)))xx(28)/(2)),7=(T(H_(2)))/(T(N_(2)))xx14`
or `T(N_(2))=2T (H_(2))`
i.e., `T(N_(2)) GT T(H_(2))" or "T(H_(2)) lt T(N_(2))`.
Discussion
8.

Which of the following is correct regarding aromatic nature ? A) Benzene B) Cyclopropane anion C) Cyclopentadienyl cation D) Cycloheptarienyl anion

Answer»


ANSWER :B
Discussion
9.

What is the basicity of oxialic acid ?

Answer»

SOLUTION :It is a DIBASIC ACID.
Discussion
10.

Which of the following are commonly used in making tooth paste.

Answer»

`Mg(OH)_(2)`
`MgCO_(3)`
`CaCl_(2)`
`Ca(NO_(3))_(2)`

Solution :`Mg(OH)_(2)` and `MgCO_(3)` are commonly used in making TOOTH paste
Discussion
11.

The work function for Ceasium atom is 1.9 eV. Calculate the threshold frequency

Answer»

Solution :WORK FUNCTION `(w_0)=h_v,` where V0 is the THRESHOLD frequency `w_0=1.9__eV=1.9xx1.602xx10^(-19)JthereforeV_0=w_0/h=(1.9xx1.602xx10^(-19))/(6.626xx10^(-34))=4.594xx10^14s^(-1)`
Discussion
12.

Which of the following are Lewis acids? H_(2)O,BF_(3),H^(+),CO_(4)^(+).

Answer»

SOLUTION :`BF_(3), H^(+)and NH_(4)^(+) ` (Remember that all CATIONS are LEWIS acids).
Discussion
13.

Which of the following is a cumulative dienes

Answer»

Buta 1,3-diene
PENTA 1,4-diene
HEXA 2,4-diene
Propadiene

Solution :ADJACENT double BONDS
Discussion
14.

Which one of the following compounds gives characteristic deep colour with FeCl_(3) solution ?

Answer»

acetone
ethanol
phenol
acetic acid

Solution :Phenol GIVES purple colour with `FeCl_(3)`.
Discussion
15.

Which atom in the following reactions undergoes a change of oxidation state of -5 ?

Answer»

`MnO_(4)^(-)toMn^(2+)`
`Cr_(2)O_(7)^(2-)to2Cr^(3+)`
`MnO_(4)^(-)toMnO_(2)`
`CrO_(4)^(2-)TOCR^(3+)`

Answer :A
Discussion
16.

Total number of orbitals associated with third shell will b e .......

Answer»

2
4
9
3

Solution :Total number of ORBITALS ASSOCIATED with nth SHELL =`n^(2)` Total num BER of orbitals related with third shell = (3)2 = 9
Discussion
17.

Which of the following conditions represaents an equilibrium ?

Answer»

Freezing of ice an open vessel, TEMPERATURE of ice is constant
Few drops of water is present along with air in a balloon, temperature of balloon is constant
Water is boiling in an open vessel over stove, temperature of water is constant
All the statements (a), (b) and (C) are CORRECT for the equilibrium

Solution :In a reversible reaction some AMOUNT of the reactants remain unconverted into PRODUCTS.
Discussion
18.

What is Eutrophication ?

Answer»

Solution :The process in which nutrient enriched water bodies support a dense plant population. Which kills ANIMAL life by depriving it of OXYGEN and results in SUBSEQUENT LOSS of biodiversity is known as Eutrophication.
Discussion
19.

What is the solubilityproduct (K_(sp))of calcuim phosphate in pure water ? [S=molar solubility]

Answer»

`108 X^(2) `
` 36 x^(3) `
` 36 x^(5)`
` 108 x ^(5) `

Solution :`Ca_3 (PO_4)_2 hArr 3Ca^(+2)+2PO_4^(3-) `
`"" 3X "" 2X `
` Ksp= (3x) ^(3)(2x)^(2) =108x^(5)`
Discussion
20.

Write the systematic names of the following aromatic compounds: (i) (ii) (xix) para-Bromo - tert-butylbenzene Strategy: If there is only one group on the ring, no number is needed to designate its position. If there are two groups, we use the traditional designations (1,2-for ortho, 1,3-for meta, and 1,4-for para). If there are three or more goups on the ring then location numbers are assigned to give the lowest set of locants.

Answer»

Solution :(i) Ethylbenzene
(ii) `n`-PROPHYLBENZENE
(iii) (`2`-Methylpropyl) benzene (or Isobutylbenzene)
(iv) `p`-Ethyltoluene
(V) `1`-Bromo-`3`-nitrobenzene or `m`-Bromonitrobenzene
(vi) `m`-Ethylisopropylbenzene
(vii) `2`-Methyl-`3`-phenylpentane
(VIII)
(ix) `2`-Phenylethyne (or phenylacetylene)
(xi) `2,4`-Difluorobenzenesulphonic acid
(xii)
(xiii)
(xiv) `1,2,4`-Trinitrobenzene
(xv) `1`-Ethenyl -`3`-ethyl `-5`- etynylbenzene
(xvi) `1`-Iodo-`2`-metylbenzene ( or `o`-Iodotoluene)
(xvii) `1`-Bromo-`3`-ethenylbenzene (or `m`-bromostyrene)
(xviii) `4`-Ethyl -`1,2`-dimethylbenzene (not `1`-Ethyl-`3,4`-dimethyl benzene which has higher SET of locants)
(xix)
Discussion
21.

What is the difference between milk of lime and lime water ?

Answer»

Solution :A suspension of slaked lime , i.e., `Ca(OH)_(2)` in water is CALLED MILK of lime but a CLEAR decanted or filtered solution of slaked lime in water is called lime water .
Discussion
22.

What can be formed on heating gypsum at 120^(@)C ?

Answer»

PLASTER of Paris
Calcium bicarbonate
Calcium carbide
Quick lime

Answer :A
Discussion
23.

Urea on hydrolysis produces ammonia and carbon dioxide. The standard entropies of urea, H_2O , CO_2 , NH_3are 173.8,70,213.5 and 192.5 "J mole"^(-1) K^(-1)respectively. Calculate the entropy change for this reaction.

Answer»

Solution :`S^0"(UREA)=173.8 "J mol"^(-1) K^(-1)`
`S^0(H_2O)=70 "J mol"^(-1)K^(-1)`
`S^0(CO_2)=213.5 "J mol"^(-1) K^(-1)`
`S^0(NH_3)=192.5 "J mol"^(-1) K^(-1)`
`NH_2-CO-NH_2+H_2O to 2NH_3+CO_2`
`DeltaS_r^0 =sum (S^0)_"products" -sum (S^0)_"reactants"`
`DeltaS_r^0=[2S^0(NH_3)+S^0(CO_2)]-[S^0"(urea)"+S^0(H_2O)]`
`DeltaS_r^0`=[ 2 x 192.5 + 213.5 ]-[173.8 +70 ]
`DeltaS_r^0`=[598.5]-[243.8]
`DeltaS_r^0=354.7 "J mol"^(-1) K^(-1)`
Discussion
24.

What is the total number of sigma and pi bonds in the following molecules? (a) C_(2)H_(2)""(b)C_(2)H_(4)

Answer»

Solution :(i) `H-C-=C-H""{:(SIGMA" BONDS = 3"),(pi" bonds = 2"):}`
(II) `H-UNDERSET(H)underset(|)C=underset(H)underset(|)C-H""{:(sigma" bonds = 5"),(pi" bonds = 1"):}`
Discussion
25.

Write the expression for Delta U under an isothermal process.

Answer»

<P>

SOLUTION :`DU = q - p .dV` (or) `q = dU + p.dv`
When work is done by system, `W = -p.dv`.
Discussion
26.

What is the minimum volume of water required to dissolve 1 g of calcium sulphate at 298 K. For calcium sulphate, K_(sp)=9.1xx10^(-6).

Answer»

Solution :`CaSO_(4)(s)hArrCa^(2+) (aq) + SO_(4)^(2-) (aq)`
If s is the SOLUBILITY of `CaSO_(4)` inmoles `L^(-1)`, then `K_(sp)=[Ca^(2+)]xx[SO_(4)^(2-)]=s^(2)`
or `s=sqrt(K_(sp))=sqrt(9.1xx10^(-6))=3.02xx10^(-3) "mol" L^(-1) = 3.02xx10^(-3) xx 136 G L^(-1) = 0.411 g L^(-1)`[Molar mass of `CaSO_(4) = 136 g "mol"^(-1)`)
THUS, for dissolving 0.411 g, water required = 1 L
`:. ` For dissolving 1 g, water required `=(1)/(0.411) L = 2.43 L`.
Discussion
27.

Which of the following is an alloy of non-transition elements?

Answer»

Elektron
Brass 
Bronze
German SILVER 

ANSWER :A
Discussion
28.

What is the effect of increae in temperature for the reaction? 2NO_(2(g))hArrN_(2)O_(4(g))""DeltaH=-572.5kJ

Answer»

SOLUTION :Increase in temperature INCREASES the RATE of backward REACTION because forward reaction is exothermic.
Discussion
29.

What is the formula of boric acid ?

Answer»

`B(OH)_3`
`HBO_3`
`B_2O_3`
`H_2BO_3`

ANSWER :A
Discussion
30.

Which of the following in viable particulates

Answer»

FUNGUS
pulvarised coal
Herbicides
MOULDS

Solution :Moulds
Discussion
31.

X and Y both are m oving particles. The uncertainty in measure of momentum of Y is half than that of X. If uncertainity of position of X is pm 0.05A than that of Y is ....

Answer»

`2.5XX10^(-10)` CM
`1xx10^(-10)` cm
`5xx10^(-10)` cm
`1xx10^(-9)` cm

Solution :`1xx10^(-9)` cm
`triangle` p of y=`1/2` of x =`1/2 triangle p_(x)`
For x `triangle x triangle p =(H)/(4pi)`
`0.05 A xx triangle p_(x)=(h)/(4pi)`
`thereforetrianglex =0.05 xx2`
`=0.1 xx10^(-10)` cm
`=1xx10^(-9)` cm
Discussion
32.

Which among the following represents an amide

Answer»




ANSWER :D
Discussion
33.

Which one of the following is reduced with Zn, Hg and HCl acid to give the corresponding hydrocarbon ?

Answer»

ETHYL acetate
Butan-2-one
Acetamide
Acetic ACID

ANSWER :B
Discussion
34.

Which of the following is not a state function?

Answer»

S
H
G
q

Answer :D
Discussion
35.

Which of the following are obtained as the only product after hydration of suitable alkyne with H_2SO_4, and HgSO_4 ?

Answer»




SOLUTION :METHYL KETONES are formed from terminal alkynes .
Discussion
36.

Which type of intermediate (A) is formed during the reaction? CH_(3)CH_(2)-N=N-CH_(2)CH_(3) overset("heat")to (A)+N_(2)

Answer»

Carbocation
Carbanions
Free radical
Carbene

Solution :`CH_(3)CH_(2)-N=N-CH_(2)CH_(3) overset("HEAT")to underset("Free radical (A)")(2CH_(3) overset(.)(C)H_(2)+N_(2))`
Discussion
37.

Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame ?

Answer»

2
13
1
17

Solution :ELEMENTS of group 1 (alkali METALS) and elements of group 2 (alkaline earth metals) has 1 and 2 electrons in their valence shells and they have very LESS ionisation energies. Elements of group 1 and group 2 imparts colour during flame test.
Discussion
38.

Which of the following statement is not correct about Lother Meyer's plot of atomic volume against atomic weight ?

Answer»

Alkali metals are at the peak
Alkaline earth metals are at the descending portions of the curve.
HALOGENS OCCUPY ascending portions of the curve
The ELEMENTS in the troughs are chemically very REACTIVE.

Solution :The elements in the troughs are chemically very reactive is INCORRECT about Lother Meyer.s graph.
Discussion
39.

Which has a higher energy : a photon of red light with a wavelegth of 7500 Å or a photon of green light with a wavelength of 5250 Å?

Answer»


Solution :`E = hv = h (C)/(lamda)`. Thus, `E PROP (1)/(lamda)`
Discussion
40.

The sizes of A, A^+ and A^- follows the order

Answer»

`A^(+) GT A^(-) gt A`
`A^(-) gt A^(+) gt A`
`A^(-) gt A gt A^(+)`
`A gt A^(-) A^(+)`

ANSWER :C
Discussion
41.

What are the effects of smoking habits for pregnant women ?

Answer»

Solution :If the pregnant women has a HABIT of SMOKING, the CO RATIO increases in order to increase the chances of MISCARRIAGE, spontaneous ABNORMALITIES and disorders in the baby.
Discussion
42.

What type of hybridisation is involved in SF_(6) ?

Answer»

SOLUTION :`SP^(3) d^(2)`
Discussion
43.

What are the sources of the human body that produces free radicals?

Answer»

SOLUTION :Sources for HUMAN body produces free radicals.
(i) Human body is exposed to X-rays.
(ii) Cigarette smoke
(iii)INDUSTRIAL chemicals.
(iv) AIR pollutants.
Discussion
44.

Which one of the following statement is false :

Answer»

WORK is a state function
temperetaue is a state function
change in the state is COMPLETELY DEFINED when the initial and final states are specified.
work appears at the BOUNDARY of the system.

Answer :A
Discussion
45.

What are extensive properties?

Answer»

Solution :(i)The PROPERTY that is depend on the mass or size of the system is called an extensive property
(II) EX. VOLUME, NUMBER of moles, mass and internal energy.
Discussion
46.

Which of the following compounds will exhibits trans (geometrical) isomerism ?

Answer»

Butanol
2-Butyne
2-Butenol
2-Butene

Answer :D
Discussion
47.

which of the following options temperature-dependent concentration term?

Answer»

PPM
`%` w/w
Volume STRENGTH of `H_(2)O_(2)`
`%` labelling of oleum

Answer :A::C
Discussion
48.

Which of the following are Lewis acids ?

Answer»

`PH_(3) and BCl_(3)`
`AlCl_(3) and SiCl_(4)`
`PH_(3) and SiCl_(4)`
`BCl_(3) and AlCl_(3)`

SOLUTION :`BCl_(3)` - electron deficient, incomplete orbit.
`AlCl_(3)` -electron deficient, incomplete octet.
Note. `SiCl_(4)` can accept a lone pair of ELECTRONS in d-orbital of SILICON and HENCE acts as a LEWIS acid.
Hence, option 2 can also be considered as correct
Discussion
49.

What is the effect of added inert gas on the reaction of equilibrium?

Answer»

Solution :When an inert gas (i.e., a gas which does not react with any other species INVOLVED in equilibrium) is added to an equilibrium SYSTEM at CONSTANT volume, the total number of moles of GASES present in the container increases, that is, the total pressure of gases increases, the partial pressure of the reactants and the products are unchanged. Hence at constant volume,addition of inert gas has no EFFECT on equilibrium.
Discussion
50.

Which of the following can act as an oxidising and reducing agent in neutral and alkaline solution ?

Answer»

`K_(2)Cr_(2)O_(7)`
`KMnO_(4)`
`Cl_(2)`
`CrO_(3)`

Solution :`KMnO_(4)`
Discussion