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.

Which one of the following statements is/are correct?

Answer»

Gallium has higher ionisation enthalpy than ALUMINIUM
Boron does not EXIST as `B^(3+)` ion
Aluminium forms `[AIF_(6)]^(3-)` ion but boron does not form `[BF_(6)]^(3-)` ion
Tl `(NO_(3))_(3)` acts as an OXIDISING agent.

Answer :1234
Discussion
2.

Write the ozonolysis products of mesitylene.

Answer»

SOLUTION :
Discussion
3.

What are hydrogroscopic substance ? Give example

Answer»

Solution :Some substance are HIGHLY SOLUBLE in water as they ABSORB water from vapour of atmosphere and become soluble. Such substance are CALLED hydroscopic.
e.g., Calcium flouride `(CaF_2)` is highly soluble in water. So, that it absorb also the water vapour from atmosphere and become soluble and therefore it is hydroscopic.
Discussion
4.

The volume occupied by 0.2 mole of methane at N.T.P. is

Answer»

`4.48 DM^(3)`
`8.96 dm^(3)`
`4.4 dm^(3)`
`2.24 dm^(3)`

Solution :1 mole of methane at N.T.P. OCCUPIES 22.4 `dm^3`
0.2 mole of methane at N.T.P. occupies `22.4 xx0.2`
=4.48 `dm^3`
Discussion
5.

What volume of 0.1M KMnO_4is needed to oxidise 5mg of ferrous oxalate in acidc medium (MW of ferrous oxalate is 144) approximately 0.20 mL

Answer»

0.1 ML
0.4 mL
2.08mL
49.6 g

Solution : Milli equivalents of `KMnO_(4) = V xx 0.1 xx 5`
milli equivalents of `FeC_(2)O_(4) = ("Wt in g")/("Ew") xx 1000`
n-factor for `FeC_(2)O_(4)=3`
milli equivalents of `KMnO_(4) = 5/(144//3) = (5xx3)/(144)`
`:.` milliequivalents of `KMnO_4` =
milli equivalents of `FeC_(2)O_4`
`:. V xx 0.1 xx 5 =(5xx3)/144 :. V = 0.20 mL`
Discussion
6.

The triad of nuclei that is isotonic is.....

Answer»

`._(6)C^(14), ._(7)N^(15), ._(9)F^(17)`
`._(6)C^(12), ._(7)N^(14), ._(9)F^(19)`
`._(6)C^(14), ._(7)N^(14), ._(9)F^(17)`
`._(6)C^(14), ._(7)N^(14), ._(9)F^(19)`

Answer :a
Discussion
7.

Which of the following species can function both as oxidising as well as reducing agent ?

Answer»

`CI^(-)`
`CIO^(-)`
`CIO^(-)`
`MnO_(4)^(-)`

Solution :ONE oxidising AGENT `(FeCI_(3) or HgCI_(2))` and one reducing agent `(SnCI_(2))` cannot stay together but TWO reducing agents `(FeCI_(2),SnCI_(2))` can stay together thus option (c ) is CORRECT
Discussion
8.

What volume shall be occupied by 6.022 xx 10^23 molecules of any gas at NTP?:

Answer»

SOLUTION :`6022 XX 10^23` molecules are contained in 1 mole, and 1 mole, of any gas at NTP occupies a VOLUME of 22.4 LITRES.
Discussion
9.

What is the distance of separation between 3rd and 4th orbit ofH-atom ?

Answer»


ANSWER :`3.703 Å`
Discussion
10.

Which of the following will decolorise alkaline KMnO_(4) solution ?

Answer»

`C_(3)H_(4)`
`CH_(4)`
`C Cl_(4)`
`C_(2)H_(4)`

ANSWER :D
Discussion
11.

When the numerical value of the reaction quotient (Q) is greater than the equilibrium constant (K), in which direaction does the reaction proceed to reach equilibrium ?

Answer»

SOLUTION :When `Q gt K_C`, the reaction will PROCEED in the REVERSE direction, i.e., formation of reactants.
Discussion
12.

Which element's position was left empty in periodic table by Mendeleev and what name did he gave ?

Answer»

SOLUTION :EMPTY SPACE for element `"" `Given NAME by him
Gelium-Eka aluminium
Germanium-Eka silicon
Discussion
13.

Which of the following hybrid orbitals possess two types of angles? (1) sp^(3), (2) sp^(2), (3) sp, (4) sp^(3)d, (5) sp^(3)d^(2), (6) sp^(3)d^(3)

Answer»

SOLUTION :`SP^(3)d and sp^(3)d^(3)`.
Discussion
14.

When a sample of a gas is compressed at constant temperature from 15 atm to 60 atm, its volume changes from 76 cm^3 to 20.5 cm^3. Which of the following are possible.

Answer»

The gas SHOWS non-ideal behaviour
The gas dimerizes
The gas is adsorbed onto the vessel walls
The gas molecules have REPULSIONS to each other

Solution :`P_1V_1 = 15 xx 76 = 1140`
`P_2V_2 = 60 xx 20.5 = 1230` = non ideal behavious
If it was ideal, `V_2 = 19`
`= V_r > V_i = Z > 1 = ` repulsions dominate.
Discussion
15.

Which among the halogens would you expect to have the least electronegativity and why?

Answer»

SOLUTION :On moving down the group , electronegativity decreases because atomic size increases . Iodine is the LARGEST , THEREFORE it is LEAST electronegative.
Discussion
16.

Which of the following compound is 'P' ?

Answer»




SOLUTION :N//A
Discussion
17.

Write short notes on (i) + E effect and (ii) -E effect

Answer»

Solution :When the ` pi` electron is transferred TOWARDS the attscking reagent it is called + E (positive electromeric ) effect .

The addition of ` H^(+)` to alkene as SHOWN above is an examples of +E effect .
When the electron is transfered AWAY from the attacking reagent , it is called , - E (negative electromeric ) effect .
Discussion
18.

The volume expansivity of a gas under constant pressure is 0.0037. Calculate its volume at its volume at -100^(@)C if its volume at 100^(@)C is 685 cm^(3).

Answer»

Solution :Volume expansivity of a gasmeans INCREASE or decrease in volume per DEGREE rise or fail in temperature of its volume at `0^(@)C`.
`V_(t)=V_(0)+0.0037xxV_(0)xxt=V_(0)(1+0.0037 t)`
At `100^(@)C"" V_(100^(@)C)=V_(0)(1+0.0037xx100)=685"cm"^(3)"" ("Given")"or" V_(0)=(685)/(1.37)=500" cm"^(3)`
At `-100^(@)C,"" V_(-100^(@)C)=500[1+0.0037xx(-100)]=315" cm"^(3)`
Discussion
19.

Which of the following is incorect?

Answer»

HydrogengtDeuteriumgtTritium, (%relative ABUNDANCE)
HYDROGEN`lt`Deuterium`lt`TRITIUM,(density/g `L^(-1)`)
Hydrogen`lt`deuterium`lt`tritium,(boiling ponit/K)
HydreogengtDeuteriumgttritium,(melting point/K)

ANSWER :D
Discussion
20.

The solubility of Mg(OH)_(2) is 8.352xx10^(-3) g/litre at 290^(@) C. Find out its K_(sp) at this temperature.

Answer»

Solution :`Mg(OH)_(2)` ionizes completely in the solution as : `Mg(OH)_(2)rarrMg^(2+)+2OH^(-)`
`:. [Mg^(2+)]=[Mg(OH)_(2)] and [OH^(-)] = 2xx [ Mg (OH)_(2)]`
But Molar mass of Mg`(OH)_(2) = 58 G "mol"^(-1)`
`:. [Mg(OH)_(2)]=("Strength in g / litre")/("Molar mass") = (8.352xx10^(-3))/(58) = 1.44 xx 10^(-4)` moles/litre
`:. [Mg^(2+)]=1.44xx10^(-4)` moles/litre and `[OH^(-)] = 2xx1.44xx10^(-4)=2.88xx10^(-4)` moles/litre
`:. K_(sp) ` for `Mg(OH)_(2)=[Mg^(2+)][OH^(-)]^(2)=(1.44xx10^(-4))xx(2.88xx10^(-4))^(2)=1.194xx10^(-11)`
Discussion
21.

Which of the following have zero electron gain enthalpy?

Answer»

HALOGENS
NOBLE gases
Chalcogens
GOLD

ANSWER :B
Discussion
22.

What happens when Al_4C_3 reacts with D_2O?

Answer»


Answer :`Al_(4)C_(3)+12D_(2)O to 3CD_(4)+4AL(OD)_(3)`
Discussion
23.

Which of the following represent a set of nucleophiles?

Answer»

`BF_(3), H_(2)O, NH^(2-)`
`AICI_(3), BF_(3), NH_(3)`
`CN^(-),RCH_(2), ROH`
`H^(+), RNH_(3), CCI_(2)`

Answer :C
Discussion
24.

TlI_(3) is a black coloured sparingly soluble ionic compound. In its aqueous solution, it will give

Answer»

`Tl^(+)` gives `I_(3)^(-)` IONS
`Tl^(3+)` and `I^(-)` ions
`Tl^(+), I^(-)` ions and `I_(2)`
`Tl^(+)` and `I^(-)` ions

Solution :`TlI_(2)` is analogous to potassium tri-iodide. It is not thallic iodide ot THALLIUM (III) iodide. It contains `K^(+)` and tri-iodide ion `I_(3)^(-)`.
Discussion
25.

Water plays a key role in the biosphere. It is due to certain properties of H_(2)O as compared to other liquids. These are except

Answer»

higher SPECIFIC heat
lesser thermal CONDUCTIVITY
high dielectric CONSTANT
high surface tension.

Solution :Water has higher thermal conductivity, specific heat, dielectric constant and surface tension in COMPARISON to other LIQUIDS.
Discussion
26.

Which of the following is INCORRECT regardinginstantaneous dipole moment ?

Answer»

It is a non zero dipole moment of a non-polar molecule and is valid for SMALL TIME interval.
During the instant of instantaneous dipol moment, the centres of positive and negative charges of an atom do not coincide.
Sum of all the instantaneous dipole moment GIVES the value of total dipole moment of the non -polar molecule.
Instantaneous dipoles induce PERMANENT dipoles in the atoms or molecules in the VICINITY and produce dispersion forces.

Answer :D
Discussion
27.

Upon heating one litre of N/2 HCl solution, 2.67 gm of hydrogen chloride is lost and the volume of solution shrinks to 750 ml. The normality of resulting solution is

Answer»

18.25 N
1.138 N
0.569 N
0.5 N

Solution :`w=0.5xx36.5xx1=18.25gr`.
REMAINING wt.of `HCl=18.25-2.67=15.58g`
`N=(w)/(GEW)XX(1000)/(V"(in ML)")N=(15.58)/(36.5)xx(1000)/(750)=0.569N`
Discussion
28.

Which element are known as reactive elements ?

Answer»

SOLUTION :ELEMENTS of s-block and p-block are KNOWN as REACTIVE elements.
Discussion
29.

Which isotope of hydrogen is radioactive?

Answer»

 PROTIUM
 Deuterium
 Tritium
`"_(1)^(2)H`

Answer :C
Discussion
30.

The relative proportion of the atoms of tritium and protium is :

Answer»

`10:10^17`
`1:10^17`
`10:10^(-7)`
`1:10^7`

ANSWER :B
Discussion
31.

The shape of the molecule containing 3 bond pairs and one lone pair around the central atom is ………….

Answer»

SOLUTION :TRIGONAL PYRAMIDAL
Discussion
32.

What are polar molecules ? Give examples.

Answer»

SOLUTION :(i) Diatomic molecules such as`H_(2), O_(2), F_(2)` have ZERO dipole moment and are CALLED non polar molecules.
Molecules such as HF, HCI, CO, NO have non zero dipole moment values and are called polar molecules.
Discussion
33.

What happens when (i) magnesium is burnt in air (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated ?

Answer»

Solution :(i) `2 Mg (s) + O_(2) (g) overset(Delta)(to) 2 MgO(s)and 2 Mg(s) +N_(2) (g) overset(Delta)(to) UNDERSET("Mag. Nitride")(Mg_(3) N_(2)(s))`
(ii) `underset("Quick lime")(CaO(s)) + underset("Silica")(SiO_(2)) (s) overset(Delta)(to) underset("Calcium silicate") (CaSiO_(3) (s))`
(iii) It reacts with `Cl_(2)` to form calcium hypochlorite , `Ca(OCL)_(2)-a` constituent of bleaching powder
`underset("Slaked lime")(2 Ca(OH)_(2)) + 2 Cl_(2) to ubrace(CaCl_(2) + Ca(OCl)_2)_("Bleaching power") + 2H_(2)O`
(iv) `2 Ca(NO_(3))_(2) (s) overset(Delta) (to) 2 CaO(s) + 4 NO_(2) (g) + O_(2) (g)`
Discussion
34.

What is meant by free energy of a system ? What will be the direction of the chemical reaction when (i) Delta G = 0 (ii) Delta G gt 0(iii) Delta G lt 0 ?

Answer»

SOLUTION :Free energy is defined as the energy which can be converted into useful work.
(i) `Delta G = 0`, the reaction will be in equilibrium
(II) `Delta G gt 0`, the reaction will not take place.
(III) `Delta G LT 0`, the reaction will be spontaneous.
Discussion
35.

What weight of N_2 is present in a 22.4 lit flask at 273^@C and 380mm?

Answer»

8g 
11G 
79 
14G 

Answer :C
Discussion
36.

When 1 mole Zn powder is reacted with 1 mole sulphuric acid in bomb calourimeter (closed isolated system),...........

Answer»

`Delta U lt 0 , W =0`
`Delta U GT 0, w =0`
`Delta U lt 0, w lt 0`
`Delta U gt 0 , w gt 0`

Solution :For the reaction in CLOSED vessel, internal energy is `Delta U`.
Reaction is erothermic, therefore `Delta U lt 0`.
Volume of gas remains CONSTANT therefore work `w=0`.
Discussion
37.

Which out of LI, Na, K, Be, Mg, Ca has lowest ionization enthalpy and why?

Answer»

Solution :K has lowest ionisation ENERGY due to larger atomic SIZE among these elements. Ther force of attraction between VALENCE electron and nucleus is less, therefore, it can lose ELECTOR easily.
Discussion
38.

What is meant by Plasma state? Give an example.

Answer»

SOLUTION :Gaseous STATE of matter at very high TEMPERATURE containing gaseous IONS and free electron is referred to as the Plasma state, e.g. Lightning
Discussion
39.

Which element having more ionisation enthalpy? (i) Ne or Ar (ii) Cl or F(iii) F or O (iv) N or O(v) Na or K(vi) Cl or S (vii) Kr or Xe(viii) P or S

Answer»

Solution :(i) NE(ii) F(iii) F (IV) N
(V) NA(vi) Cl(vii) KR(viii) P
Discussion
40.

Whichdevelopmentplayed a rolein theformationof Bohr.s modelof atom ?

Answer»

SOLUTION :Twodevelopments played amajorrole in the formulationof Bohr.smodelof atomResultsobservedfromthestudies of interactions ofradiationswith matterhaveprovidedimmenseinformationregardingthe structureof atomsand MOLECULES . NeilsBohrutllisedthesereusltsto giveatomicmodel
(i) Dualcharacterof theelectromagneticradiationwhichmeansthatradiationspossessbothwavelikeand particlelikeproperties.
(ii)EXPERIMENTAL resultsregardingatomicspectrawhichcan beexplainedonly byassumingquantizedelectronic energylevelsin ATOMS
Discussion
41.

Which of the following compounds will not exist as resonance hybrid ? Give reason for your answer . CH_(3) - OH

Answer»

SOLUTION :` CH_(3) - OH ` : Does not exist as resonance hybrid due to ABSENCE of ` pi`-electrons .
Discussion
42.

Which of the following statement is not correct:-

Answer»

The EXTENT of adsorption depends on the NATRUE of the ADSORBENT and adsorbate
The extent of adsorption depends on the pressure of the gas
The extent of adsorption depends on the temperature
The extent of adsorption has no UPPER limit

Answer :D
Discussion
43.

Threshold limit value of three pollutants X, Y and Z are respectively 9 ppm, 20 ppm and 5 ppm. Which one is the most toxic ?

Answer»

Solution :LESSER the TLV value more is the toxicity of POLLUTANT. THUS Z is the most TOXIC.
Discussion
44.

Which of the following compounds will not exist as resonance hybrid ? Give reason for your answer . CH_(3) - CH = CH - CH_(2) NH_(2)

Answer»

Solution : `CH_(3) - CH = CH - CH_(2) NH_(2)`: Does not exist as RESONANCE hybrid, because the LONE pair on N-atomis not conjugated with ` pi`-electrons of the DOUBLE bond .
Discussion
45.

Which of the following forms cationic micelles above certain concentration ?

Answer»

Cetyltrimethylammonium bromide
Sodium dodecyl sulphate
Sodium acetate
Urea.

Solution :Cetylrimethylammonium bromide, `C_(16)H_(33)"" N^(+)(CH_(3))_(3)Br^(-)` FORMS CATIONIC mcelles above its C.M.C.
Discussion
46.

Write the preparation of methane from methyl chloride and acetic acid.

Answer»

SOLUTION :(i) `UNDERSET(+H_(2),-HCl)overset("Reduction Zn", H^(+))rarr`
(ii) `CH_(3)COOH underset(-H_(2)O)overset(NaOH)rarr CH_(3)COO^(-)Na^(+)`
(iii) `underset("Sodium ethanoate")(CH_(3)COO^(-)Na^(+)) underset(Delta, -Na_(2)CO_(3))overset(+"Na(OH), CaO, SODALIME")rarr CH_(4)`
Discussion
47.

Which of the following molecules has the shortest carbon single bond length ?

Answer»

`CH_(2) = CH - oversetoverset(O)("||")C -OH`
`CH_(2) = CH - C -=N`
`CH_(2) = CH - CH = O`
`CH_(2) = CH - CH = CH_(2)`

ANSWER :B
Discussion
48.

The solubility of Pb(OH)_(2) in water is 6.7xx10^(-6)M. Calculate the solubility of Pb(OH)_(2) in a buffer solution of pH = 8

Answer»

Solution :`Pb(OH)_(2) hArr Pb^(2) + 2 OH^(-)`
`:. K_(sp)=[Pb^(2+)][OH^(-)]^(2)=s xx (2s)^(2)=4 s^(3) = 4xx(6.7xx10^(-6))^(3) = 1.20 xx 10^(-15)`
In a solution with pH = 8, `[H^(+)]=10^(-8) and [OH]^(-) = 10^(-6)`
`:. 1.2xx10^(-15)=[Pb^(2+)]xx(10^(-6))^(2) or [Pb^(2+)]=(1.2xx10^(-15))/((10^(-6))^(2))=1.2xx10^(-3)M`
Discussion
49.

Type pf hybridization of complex (E):

Answer»

`sp^(3)d^(2)`
`d^(2)sp^(3)`
`sp^(3)`
`dsp^(2)`

Solution :`{:(A rarr Pb(NO_(3))_(2),,B rarrNO_(2)(sp^(2))),(Crarr N_(2)O_(3),,DRARR HNO_(2),),(E rarr[Fe(H_(2)O)_(5)NO]SO_(4)(sp^(3)d^(2)),FrarrPbS,),(G rarr H_(2)O,,H rarr NO,):}`
`I rarr PbCrO_(4) (AcOH` INSOLUBLE)
`HNO_(2) +I^(-) +H^(+) rarr NO` (Gas H)
Discussion
50.

What is meant by non (homo) polar covalent bond ?

Answer»

SOLUTION :`107^(@) and 104^(@)` RESPECTIVELY.
Discussion