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 size of iso electronic species F-Ne and Na^+ is affected by

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NUCLEAR charge
principle QUANTUM number
elctron-electron INTERACTION in outer orbitals
none of the factors because their size is the same

Answer :A
Discussion
2.

What will be the order of energy levels 3s, 3p and 3d in case of H-atom ?

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SOLUTION :AL' have EQUAL ENERGY
Discussion
3.

The. van der Waal's equation of law of corresponding states for 1 mole of gas is :

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`(pi + 3/(phi^2)) (3 phi - 1) = 8 theta`
`(pi + 3/(phi))(3 phi - 1) = 8 theta`
`(pi + 3/(phi)) (3 phi + 1) =8 R theta`
`(pi + 3/(phi)) (3 phi - 1) = 8 R theta`

Solution :`(P- a/(V^2) (V - B) = RT`
`P = pi P_C = (pi .a)/(27 b^2 ) , V = phi , V_C = 3bphi`
`T = theta T_C = (a theta)/(27 Rb)`
`IMPLIES ((pi a)/(27 b^2) + a/(9 b^2 phi^2)) (3 b phi - b) = (R xx a theta)/(27 Rb)`
`implies (pi + 3/(phi^2)) (3 phi - 1) = 8 phi`.
Discussion
4.

Which out of the following has the largest size ?

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`RB^(+)`
`Mg^(2+)`
`LI^(+)`
`Na^(+)`

ANSWER :A
Discussion
5.

What is blue baby syndrome ?

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Solution :In many agricultural areas, tube well WATER is contaminated with nitrate `(NO_(3)^(-))` ions. Excessive NITRATES are especially dangerous to INFANTS. In the infants's digestive SYSTEM, nitrates ion is reduced to nitrate ion. This results in methemoglobinenia or blue baby syndrome. The baby turns blue and can die after drinking the water if not treated.
Discussion
6.

What is covalent radius ? . How would you determine the covalent radius of chlorine atom .

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Solution :The DISTANCE between the nuclei of two covalently bonded atoms is known as covalent distance or inter-nuclear distance. The one-half of this inter-nuclear distance is called covalent RADIUS. The covalent distance (Cl-Cl) of Cl, MOL ecule is EXPERIMENTALLY found as 198 PM (1.98 A). Its covalent radius is 99 pm `(0.99oversetoA)`
. CI-CI Inter nuclear distance =`1.98 oversetoÅ`
`therefore r_(Cl)=1.98//2=0.99oversetoÅ`.
Discussion
7.

To which orbit the electron in the hydrogen atom will jump on absorbing 12.1 eV of energy?

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Solution :ENERGY of ELECTRON in the nth ORBIT of H-atom is `E_(N) = (-13.6)/(n^(2)) eV :. E_(1) = -13.6 eV`
After absorbing 12.1 eV, the energy will be `= -13.6 + 12.1 eV = -1.5 eV`
THUS, `(-13.6)/(n^(2)) = - 1.5 eV or n^(2) = 9 or n = 3`
Thus, electron will jump to 3rd orbit.
Discussion
8.

Which of the following can not be obtained when alkenes are oxidised with KMnO_(4) and then followed by acid hydrolysis ?

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alkanoic acids
alkanals
alkanones
carbon dioxide

Answer :B
Discussion
9.

Which of the following substances will have positive value of DeltaH_("formation")?

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`Br_(2)(l)`<BR>`O_(3)(g)`
ZNO(s)
`H^(+)(aq)`

ANSWER :B
Discussion
10.

When 4 gm of Mg burnt with O_(2) form oxide and on dilution of metal oxide form metal hydroxide which statement is/are correct for above series of reaction?

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Gram equivalent of metal, metal oxide an metal hydroxide are equal
Weight of metal oxide is 6.66 gm
Weight of metal hydroxide is 9.66 gm
Normality of SOLUTION in 1 LITRE volume is `(14)/(42)`

Solution :`2Mg+O_(2)rarr2MgO`
`MgO+H_(2)OrarrMg(OH)_(2)`
Eq. of MG = Eq. of Mgo = Eq. of `Mg(OH)_(2)`
`(4)/(12)=(W)/(20)impliesW=6.66gm`
`therefore` Eq of MgO = 6.66
Eq. of Mg = Eq. of `Mg(OH)_(2)`
`(4)/(12)=(w)/(29)impliesW=(29)/(3)=9.66gm`
Discussion
11.

What isthe ratioof massof protonandelectron?

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`1.836 xx 10^(3)`
` 1.836`
`1.836 xx 10^(2)`
`1.836 xx 10^(4)`

Solution :`(1.673 xx 10^(24))/(9.109 xx 10^(28))= 1.836 xx 10^(3)`
Discussion
12.

Which of the following structures is the most preferred and hence of lowest energy for SO_(3)-

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SOLUTION :
has maximum NUMBER of COVALENT bonds and hence is of LOWEST energy.
Discussion
13.

Which orbital has only positive value of wave function at all distances from the nucleus-

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3d
2p
2s
1s

Answer :D
Discussion
14.

Which of the following relationship are correct?

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<P>`( DeltaH- DeltaE)/( DeltanxxT ) =`Constant
`DELTAG= -T DeltaS_("Total")`
`K= E^(- DeltaG^(@) //RT)`
`[(del(DeltaH))/(delT)]_(P)= DeltaC_(p)`

Solution :(a) followsfrom `DeltaH = DeltaE +Deltan RT`.
(B) is WELL known relationship
(c ) is wrong because `DeltaU = q+w`
(d) follows from `- DeltaG^(@) = RT ln K`.
(e ) represents Kirchhoff equation.
Discussion
15.

What is the percentage of lead in lead pencil

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SOLUTION :LEAD PENCIL do not conain lead, it is GRAPHITE
Discussion
16.

What volume of oxygen at S.T.P. is required to completely burn 65.0 g ethyl alcohol ?

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ANSWER :94.81 L
Discussion
17.

Which volatile compound burns with green edged flame ?

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`(C_(2)H_(5))_(3)B`
`(C_(2)H_(5))_(3) BO_(3)`
`Ba(NO_(3))_(2)`
`BaCl_(2)`

Solution :`(C_(2)H_(5))_(3)BO_(3)` burns with GREEN edged FLAME
Discussion
18.

Which of the following are isoelectronic species

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I,II,III
II,III,IV
I,II,IV
II and I

Solution :`NH_(2)^(-) NH_(4)^(+) NH_(3)` have same number of ELECTRONS
Discussion
19.

Which one of the following pairs constitutes isotones ?

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`._(6)C^(13) and ._(6)C^(14)`
`._(6)C^(13) and ._(7)N^(14)`
`._(7)N^(14) and ._(9)F^(19)`
`._(7)N^(14) and ._(7)N^(15)`

Answer :B
Discussion
20.

What do you expect the nature of hydrides formed by elements of atomic number 15, 19 ,23 and 44 with hydrogen?

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Solution :Atomic NUMBER 15 is a non-metal (p) and its hydride is `PH_3` which is covalent .ELEMENT with atomic number 19 is an alkali metal (K) which forms ionic hydride.
Discussion
21.

Two geometrical isomers are given by the following compound

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Ethylidene bromide
Acetylene tetrachloride
Acetylene tetrabromide
Acetylene dibromide

Answer :D
Discussion
22.

What products are expected from the disproportionation reaction of hypochlorous acid ?

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`HClO_(3)` and `Cl_(2)O`
`HClO_(2)` and `HClO_(4)`
HCl and `Cl_(2)O`
HCl and `HClO_(3)`

ANSWER :D
Discussion
23.

Write the steps to be followed while balancing redox equation by oxidation number method.

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Solution :Oxidation number method:
This method is based on the fact that
Number of electrons lost by atoms = Number of electrons gained by atoms
Steps to be followed while balancing Redox reactions by Oxidation Number method:
1. Write skeleton equation representing redox reaction
2. Write the oxidation number of atoms undergoing oxidation and reduction.
3. Calculate the increase or decrease in oxidation numbers per atom.
4. Make increase in oxidation number equal to decrease in oxidation number by multiplying the formula of oxidant and reductant by suitable numbers.
5. Balance the equation atomically on both sides except O and H atoms.
6. Balance OXYGEN atoms by adding REQUIRED number of water molecules to the side deficient in oxygen atoms.
7. ADD required number of `H^(+)` ions to the side deficient in HYDROGEN atom if the reaction is in acidic medium.
8. For reactions in BASIC medium, add `H_(2)O` molecules to the side deficient in hydrogen atoms and simultaneously add equal number of `OH^(-)` ions on the other side of the equation.
9. Finally balance the equation by cancelling common species present on both sides of the equation.
Discussion
24.

What is the derivatives of ammonia ? Give example.

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SOLUTION :Ammonia is a weak base, In this one or more hydrogen is SUBSTITUTE by other GROUP is known as derivatives of ammonia.
e.g. : Methyl amine, `CH_3NH_2`
DIMETHYL amine, `(CH_3)_2NH`
Discussion
25.

When a strong beam of light is passed through a colloidal solution, the light will

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be REFLECTED
be SCATTERED
be refracted
give a RAINBOW

Solution :The beams of LIGHT gets scattered by colloidal PARTICLES .
Discussion
26.

ZnS exists in two forms called ________ and ___________

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ANSWER :ZINC BLENDE, WURTZITE
Discussion
27.

Two solids A and D dissociates into gaseous products as follows C(s)hArrB(g)+C(g),K_(P_(1))=300 , D(s)hArrE(g)+C(g)K_(P_(2)=600 at 27^(@)C, then find the total pressure of the solid mixture.

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SOLUTION :N//A
Discussion
28.

What information is derived by the shape of the graph given for a fixed mass of gas?

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Solution :The graph PV/T versus T is a straight line parallel to the temperature axis.
A jump in te curve at increased temperature denotes the CHANGE of composition.
the NUMBER ofmoles of the GAS may be DOUBLED due to dissociation. For example the dimer of nitrogendioxide decomposes to its monomer.
`underset("1 mole")(N_(2)O(4)(g)) to underset("2 mole")(2NO_(2)(g))`
Discussion
29.

Which one of the following is the first in first transition series?

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Sc
Zn
Ti
Cu

Answer :A
Discussion
30.

Which one of the following is not compatible with arenes ?

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Greater stability
Delocatization of `pi`-electrons
Electrophilic ADDITION
Resonance

Solution :Arenes UNDERGO electrophilic SUBSTITUTION and not addition REACTIONS.
Discussion
31.

Water is supercooled to -4^(@)C . The enthalpy( H ) is

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same as ice at `- 4^(@)C`
more than ice at `- 4^(@)C`
same as ice at `0^(@)C`
LESS than iceat `-4^(@)C`

Solution :When ice is supercooled to`-4^(@)C` , heat is RELEASED . So,enthalpy DECREASES.
Discussion
32.

Under the influence of electric filed, which of the following statements is true about the movement of electrons and holes in a p-type semiconductor ?

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Electron will move TOWARDS the posiitively charged plate through electron holes.
Holes willappear to be moving towards the negatively charged plate.
Both electrons and holes appear to move towards the POSITIVELY charged plate.
Movement of electrons is not RELATED to the movement of holes.

Solution :( c)is wrong because eelctrons move towards anode while anode while holes move towards cathode. (d)is ALSO not true for the same reson.
Discussion
33.

Velocity distribution is depend upon ?

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SOLUTION :(i) TEMPERATURE (II) MOLECULAR mass of gas.
Discussion
34.

Which one is least evaporite?

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HF
HCl
HI
HBr

SOLUTION :HF
Electronegativity of F is highest so STRONG HYDROGEN bond is form. So HF is leastevaporite.
..... H - F : ...... H - F : .....
Discussion
35.

Which of the following alcohol is used as beverage?

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Propanol
2-Butanol
Methanol
ETHANOL

Solution :Ethanol is USED in BEVERAGES.
Discussion
36.

The volume of water needed to dissolve 1g of BaSO_4 (K_(sp)=1.1 xx 10^(-10)) at 25^(@) Cis { M. W of BaSO_4 is 233}

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820 L
430 L
205L
NONE of these

SOLUTION :` KsP= S^(2)= 1.1 XX 10 ^(-10), S ~~ 10^(-5)"mol" // LIT`
` 1 gm =(1)/(233)` moles
` therefore ` Volume of water ` = (1//233)/( 10 ^(-5))= 430 L`
Discussion
37.

What is decomposition reaction? Give two examples

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SOLUTION :Chemical reactions in which a compound splits up into TWO or more simpler substances are called decomposition reaction
A B `RARR` A + B
Example `2KClO_(3) rarr 2KCL + O_(2)`
`PCl_(5) rarr PCl_(3) + Cl_(2)`
Discussion
38.

Which of the following are incorrect about fungicides

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THIRAM
phenyl MERCURY acetate
sodium arsenate
bordeaux mixture

Solution :Sodium arsenate
Discussion
39.

The value of DeltaG^ө for the phosphorylation of glucose in glycolysis is 13.8 kJ/mol. Find the value of K_c at 298 K.

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Solution :`DeltaG^ө`=13.8 kJ `mol^(-1)= (13.8xx10^3) "J mol"^(-1)`
`DeltaG^ө=-RT ln K_c`
`therefore DeltaG^ө`=-2.303 RT LOG `K_c`
`therefore log_10 K_c=-(DeltaG^ө)/(2.303RT)`
`=-(13.8xx10^3 "J mol"^(-1))/((2.303)xx(8.314 "J mol"^(-1) K^(-1))xx(298 K))`
=-2.4186=`bar3.5814`
`therefore K_c`=Antilog `bar3.5814=3.814xx10^(-3)`
Discussion
40.

Which of the following is used in photoelectric cells ?

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Na
K
Li
Cs

Answer :D
Discussion
41.

Which of the following is correct matching of Column-I containing formulas and Column-II containing their names:

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`i rarr d, ii rarr e, iii rarr a, IV rarr F, v rarr C, vi rarr b`
`irarr f, ii rarr b, iii rarr e, iv rarr d, v rarr c, vi rarr a`
`i rarr f, ii rarr e, iii rarr b, iv rarr d, v rarr a, vi rarr c`
`irarr d, ii rarr c, iii rarr b, iv rarr e, v rarr a, vi rarr f`

Answer :B
Discussion
42.

Write the resonance structures of CO_3^(2-) and HCO_3^-

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SOLUTION :
Discussion
43.

There is S-S bond in .

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`S_(2)O_(6)^(2-)`
`S_(4)O_(6)^(2-)`
`S_(2)O_(3)^(2-)`
`S_(2)O_(7)^(2-)`

Solution :`S_(2)O_(6)^(2-)` (Dithionate ion)
`.^(Theta)O-underset(O)underset(||)OVERSET(O)overset(||)S-underset(O)underset(||)overset(O)overset(||)S-O^(Theta)`
(B) `S_(4) O_(6)^(2-)` (Tetrathionate ion)
`^ThetaO-underset(O)underset(||)overset(O)overset(||)S-underset(O)underset(||)overset(O)overset(||)S-O^(Theta)`
(c ) `S_(2) O_(3)^(2-)` (Thiouslphate ion)
`.^(Theta)O-underset(O)underset(||)overset(O)overset(||)S-O^(Theta)`
(d) `S_(2) O_(7)^(2-)` (Pyrosulphate ion)
`^(Theta)O-underset(O)underset(||)overset(O)overset(||)S-underset(O)underset(||)overset(O)overset(||)S-O^(Theta)`
In (d) there is no `S -S` bond .
Discussion
44.

Total number of alkenes obtained by dehydration of 3,4-diethylhexan-2-ol in acidic medium ?

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SOLUTION :
Discussion
45.

Which of the following ammonium salt will not give acid on heating?

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`(NH_(4))_(2)HPO_(4)`
`(NH_(4))_(2)MoO_(4)`
`(NH_(4))_(2)SO_(4)`
`NH_(4)CI`

Answer :B
Discussion
46.

What is the hybridisation state of central I atom is I_3^(-)?

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`SP^(3)`
`DSP^(2)`
`sp^(3)d^(2)`
`sp^(3)d`

ANSWER :D
Discussion
47.

Which of the following reactions is an example of Friedel craft alkylation.

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SOLUTION :Freidel craft.s ALKYLATION
Discussion
48.

The threshold frequency (v_(0)) for a metal is 5 xx 10^(14)S^(-1). Calculate the kinetic energy of emitted electron when a radiation with frequency of 2 xx 10^(15) sec^(-1) hits the metal surface.

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SOLUTION :`4.13xx10^(-19)J`
Discussion
49.

What are the necessary conditions for an ideal solution? Give two example.

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Solution :For an ideal solution
(i) There is no change in VOLUME of mixing two components (SOLUTE and solvent) `DV_(mixing") =0`
(ii) There is no exchange of heat when the solute is dissolved in solvent `(Delta H_("mixing")=0)`
(iii) Escaping tendency of the solute and the solvent present in it should be same as in pure liquids.
(IV) Examples: For ideal solution: BENZENE and toluene, n-Hexane and n-Heptane, cthyl bromide and ethyl iodide, chloobenzene and bromo benzene.
Discussion
50.

The uncertainty in the momentum of a particle is 2.2 xx 10^(-4) g cm s^(-1). With what accuracy can its position be deterimed ? (h = 6.626 xx 10^(-27) " erg" s)

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SOLUTION :`2.4 XX 10^(-24) CM`
Discussion