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.

What is value of Z at 200 bar pressure for CO_(2), CH_(4) and O_(2) ?

Answer»

Solution :This gas shows negative DEVIATION at 200 bat and `Z LT 1` but it shows positive deviation at 900 bat and `Z gt 1`.
Discussion
2.

Which one of the following is incorrect for ideal solutions?

Answer»

` DELTA H_("MIX ") =0`
` Delta U_("mix") =0`
` Delta P= P_("observed ")- P_("calculated byRaoult's LAW" )=0`
` Delta G_(mix ) =0`

Answer :C
Discussion
3.

What happened when chemical reaction occurs?

Answer»

SOLUTION :(i) Bond FISSION and bond FORMATION. (ii) Displacement of electron. (iii) ENERGY change. (iv) Substract convert into product
Discussion
4.

Two gaseous samples were analysed. One contained 1.2 g of carbon and 3.2 g of oxygen. The other contained 27.3% carbon and 72.7% oxygen. The experiemental data is an accordance with

Answer»

LAW of CONSERVATION of mass
Law of definite proportions
Law of RECIPROCAL proportions
Law of MULTIPLE proportions

Answer :B
Discussion
5.

Using Aufau priciple,write the ground state electronic configuration of following atoms.Boron(Z=5),(ii)Neon(Z=10),(iii)Aluminium(Z=14),(iv)Chlorine(Z=17),(v)calcium(Z=20),(vi)Rubidium(Z=37)

Answer»

Solution :(i) Boron(Z=5),`1s^(2)2s^(2)2p^(1)`
(II) Neon(Z=10),`1s^(2)2s^(2)2p^(6)`
(III)Almuminium(Z=13),`1s^(2)2s^(2)2p^(6)3S^(2)3p^(1)`
(iv)Chlorine(Z=17),`1s^(2)2s^(2)2p^(6)3^(2)3p^(5)`
(V)Cacium(Z=20),`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)`
(vi)Rubidium(Z=37),`1s^(1)2s^(2)2p^(6)3p^(6)3d^(10)4s^(2)4p^(6)5s^(1)`
Discussion
6.

Which is the number of Calcium in terms of elements are obtained from earth crust ?

Answer»

4
6
3
5

Answer :D
Discussion
7.

What happens in real gas at high pressure and low temperature ?

Answer»

Solution :At high pressure, effective pressure change by `(an^(2))/(V^(2))` and deviation SHOWS between real gas and Ideal gas.
At LOW pressure, SPEED of molecule decreases, distance, between molecule decrease, real VOLUME decreases to NB. It shows deviation between Ideal gas and real gas.
Discussion
8.

Vinyl carbinol is

Answer»

`HO-CH_(2)CH=CH_(2)`
`CH_(3)C(OH)=CH_(2)`
`CH_(3)-CH=CH-OH`
`CH_(3)C(CH_(2)OH)=CH_(2)`

SOLUTION :
Methyl alcohol is called CARBINOL. The compound in QUESTION is called vinyl cabinol since it is a vinyl derivative of carbinol.
Discussion
9.

Which of the following statement is incorrect ?

Answer»

`KO_(2)` and `KO_(3)` are paramagnetic species .
`KO_(2)` on hydrolysis with cold WATER yields `H_(2)O_(2)` and dioxygen.
`K_(2)O_(2)` absorbs CO and liberates dioxygen gas .
`K_(2)O_(3)` is obtained when `O_(2)` is passed through

ANSWER :C
Discussion
10.

What is the correct order for boiling point having same carbon in alkane, alkene and alkyne ?

Answer»

Alkane `gt` Alkene `gt` ALKYNE
Alkyne `lt` Alkene `lt` Alkane
Alkene `lt` Alkane `lt` Alkyne
Alkane `lt` Alkyne `lt` alkene

Solution :e.g., Boiling point INCREASES gradually in the FOLLOWING manner `C_(2)H_(6) lt C_(2)H_(4) lt C_(2)H_(2)`.
Discussion
11.

Which of the following sets of groups contains only electrophiles ?

Answer»

`NH_(2)^(-),NO_(2)^(+),H_(2)O,NH_(3)`
`F^(-),OH^(-),NH_(3),SO_(3)`
`NO_(2)^(+),AlCl_(3),SO_(3),CH_(3)overset(+)C=O`
`NH_(3),BF_(3),AlCl_(3),H_(2)O`

Answer :C
Discussion
12.

Whichquantum numberindicates,p ,d,forbitals ?

Answer»

N
s
L
m

ANSWER :C
Discussion
13.

When mercury is dropped over a glass surface the globules are spherical which is due to its

Answer»

VISCOSITY
SURFACE tension
Fluidity
Metallic nature

Answer :B
Discussion
14.

What are representative elements?

Answer»


ANSWER :ELEMENTS of s-block and p-block are REPRESENTATIVE elements.
Discussion
15.

The reagent NH_4Cl and aq. NH_3 will precipitate ions of group …..

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GROUP III-A IONS
Group III-B ions
Group I ions
Group II ions

Answer :A
Discussion
16.

Whichof thefollowingstatements isINCORRECT ?

Answer»

Alkalimetalsformmonovalent`M^(+)` ion
Generalelectrons condifurationofoutermostshellof alkalineearthmetals is `NS^(2)`
InAlkalimetals, thedifferentiatingelectron ENTERS nsorbital of THEATOM .
Alkalineearthmetalsoccurin natureinfreestate .

ANSWER :D
Discussion
17.

Which of the following statements about resonance is not correct?

Answer»

The differentresonance STRUCTURES of a molecule have fixed arrangement of atomic nuclei.
The different resonance structures of a molecule should have same number of unpaired electrons
The hybrid STRUCTURE has equal CONTRIBUTION from all the RESONATING structures
None of the individual resonating structures explains the various characteristics of the molecule

Answer :A::B::D
Discussion
18.

Write the reaction of preparation of ethane from following reaction. (i) Ethane (ii) Ethyl chloride (iii) Bromo-methane (iv) Propanoic acid (v) Acetic acid (vi) Methane (vii) from acetate ion.

Answer»

Solution :(i) `underset("Ethene")(CH_(2)=CH_(2)) underset("Pt/Pd/Ni")overset(+H_(2), "Dihydrogenation")rarr CH_(3)-CH_(3)`
(II) `underset("Ethyl chloride")(CH_(3)CH_(2)CL) underset(-HCL)overset(+H_(2), Zn, H^(+) " Reduction")rarr CH_(3)-CH_(3)`
(iii) `underset("BROMO")(2CH_(3)Br) underset(-2NaBr)overset("2Na, dry ETHER Wurtz reaction")rarr CH_(3)-CH_(3)`
(iv)
(v)
(vi) `2CH_(4) underset(-HCl, +Cl)overset(hv)rarr 2CH_(3) underset("combustion")overset("free radical")rarr CH_(3)-CH_(3)-`
(vii)
Discussion
19.

Which one has least energy in given molecular orbitals ?

Answer»

`sigma_(2p_(z))`
`sigma_(1s)`
`sigma_(2S)^(**)`
`pi_(2p_(X))`

Solution :`sigma_(1s)`
Discussion
20.

Total number of lone pair of electrons in I_3^-ion is :

Answer»

3
6
9
12

Solution :VALENCE electron = `7 xx 3 = 21`
Charge is -1 , so ACCEPTED `e^-` = 1
` therefore `Total valence ELECTRONS = 22
= 9 Lone pair electrons
Discussion
21.

When zeolite , which is hydrated sodium aluminium silicate is treated with hard water , the sodium ions are exchanged with which of the following ion(s) ?

Answer»

`H^(+)` ions
`Mg^(2+)` ions
`Ca^(2+)` ions
`SO_(4)^(2-)` ions

ANSWER :B::C
Discussion
22.

What order or C-H bond lengths do you expect in C_(2) H_(6), C_(2) H_(4) and C_(2) H_(2) and why ?

Answer»

Solution :` C - H (C_(2) H_(6)) GTC - H (C_(2) H_(4)) gt C - H(C_(2) H_(2)) ` . This is because hybridorbrid ordbitals of carbon involved in
overlapping with 1s ORBITAL of hydrogen are `SP^(3) gt sp^(2) gt sp` and ap respecitvely and their sizes are in the order
` sp^(3) gt sp^(2) gt sp ` .
Discussion
23.

Weak acids and bases are not completely ionised when dissolved in polar medium like water H rarr H^(+) +A^(-) {:(t_(0),C,O,O),(t_(eq),C-Calpha,Calpha,Calpha):} K_(a)=(Calpha^(2))/(1-alpha)=Calpha^(2),alphasqrt((K_(a))/(C)) :. (alpha_(1))/(alpha_(2))=sqrt((Ka_(1))/(Ka_(2))),(alpha_(1))/(alpha_(2))=sqrt((C_(2))/(C_(1))) ( For two acids at same conc.) (for same acid at diff conc. ) 0.01M CH_(3),COOH is 4.24% ionised. What will be the pereentage ionisation of 0.1 M CH_(3),COOH.

Answer»

`1.33%`
` 4.24% `
` 5.24% `
` 0.33%`

Solution : ` (alpha_1)/(alpha_2) =SQRT((C_2)/(C_1)), (4.24)/(alpha_2)= sqrt((10^(-1))/(10^(-2)))`
` (18)/(alpha_2^(2))=10 , alpha_2^(2)= 1.8 rArr ALPHA =sqrt(1.8)=1.34%`
Discussion
24.

Weak acids and bases are not completely ionised when dissolved in polar medium like water H rarr H^(+) +A^(-) {:(t_(0),C,O,O),(t_(eq),C-Calpha,Calpha,Calpha):} K_(a)=(Calpha^(2))/(1-aplha)=Calpha^(2),alphasqrt((K_(a))/(C)) :. (alpha_(1))/(alpha_(2))=sqrt((Ka_(1))/(Ka_(2))),(alpha_(1))/(alpha_(2))=sqrt((C_(2))/(C_(1))) ( For two acids at same conc.) (for same acid at diff conc. ) Relative strength of two weak monoprotic acids may be given as

Answer»

` ([H^(+)])/([H^(+)]_2) `
`(alpha _1)/(alpha_2) `
`SQRT((Ka1)/(Ka_2))`
All of the above

SOLUTION :Relative strength` = ([H^(+)])/([H^(+)]_2) = (sqrt(K_(a_1)))/(sqrt(K_(a_2)))=(alpha _1)/(alpha_2)`
Discussion
25.

Weak acids and bases are not completely ionised when dissolved in polar medium like water H rarr H^(+) +A^(-) {:(t_(0),C,O,O),(t_(eq),C-Calpha,Calpha,Calpha):} K_(a)=(C alpha^(2))/(1-alpha)=Calpha^(2),alphasqrt((K_(a))/(C)) :. (alpha_(1))/(alpha_(2))=sqrt((Ka_(1))/(Ka_(2))),(alpha_(1))/(alpha_(2))=sqrt((C_(2))/(C_(1))) ( For two acids at same conc.) (for same acid at diff conc. ) alphaand alpha are in the ratio 1:2 at same conc. Ka_(1), =2xx 10^(-4), what will be Ka_(2),?

Answer»

`8xx10 ^(-4)`
` 2xx10 ^(-4)`
` 4xx10 ^(-4)`
` 1xx10 ^(-4) `

Solution :` (alpha_1)/(alpha_2) = SQRT((Ka_1)/(Ka_2) )RARR (1)/(2)= sqrt((2xx 10 ^(-4) )/(Ka_2)) , Ka_2 = 8xx 10^(-4) `
Discussion
26.

Which of the following is arranged in order of increasing radius?

Answer»

`K_((AQ))^(+)ltNa_((aq))^(+)ltLi_((aq))^(+)`
`K_((aq))^(+)gtNa_((aq))^(+)gtZn_((aq))^(2+)`
`K_((aq))^(+)gtLi_((aq))^(+)gtNa_((aq))^(+)`
`Li_((aq))^(+)ltNa_((aq))^(+)ltK_((aq))^(+)`

Answer :D
Discussion
27.

Which type of solid is SiC ?

Answer»

SOLUTION :SIC is COVALENT or NETWORK SOLID
Discussion
28.

Write short notes on the following: (i) Vital force theory. (ii) General characteristics of organic compounds. (iii) Hybridization. (iv) Polar and non-polar bonds. (v) Hydrogen bonding. (vi) Resonance. (vii) Fractional crystallisation. (viii) Vacuum distillation. (ix) Mixed melting point. (x) Purity of an organic compound.

Answer»
Discussion
29.

What is the amount of work done when 0.5 mol of methane, CH_(4)(g) is subjected to combustion at 300K? (given, R = 8.314 JK^(-1)mol^(-1)):

Answer»

`-2494` J
`-4988` J
`+4988` J
`+2494` J

Solution :`CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(L)`
Work done,`W = -p DeltaV = -Deltan_(g) RT`
`Deltan_(g)= 1 -3 = -2, T = 300K`
`w = -(-2 xx 8.314 xx 300)`
= 4988.4 J
For 0.5 mol of `CH_(4)`
` w = (4988.4)/(2) = 2494.2`
Discussion
30.

Wutrz reaction used in the preparationof ……………….

Answer»

SOLUTION :higheralkanes
Discussion
31.

Which is more soluble among the following

Answer»

`BEO`
`MGO`
`CAO`
`BAO`

ANSWER :D
Discussion
32.

Which one of the following compound is a gas (at 0^(@)C)

Answer»

`BF_(3)`
`BCI_(3)`
`BBr_(3)`
`Bl_(3)`

Answer :1
Discussion
33.

Write the descending order of electrons releasing tendensies of the Zn, Cu and Ag metals. Arrange the metals Zn, Cu and Ag in the descending order of their effective nuclear charge,

Answer»

SOLUTION :Zinc, COPPER and SILVER the electro RELEASING thendency is the following order.
Discussion
34.

The volume strength of 1.5 N H_2O_2 solution is …..

Answer»

4.8
5.2
8.8
8.4

Answer :D
Discussion
35.

Which of the following is not aromatic ?

Answer»

Benzene
Cyclooctatetraenyl dianion
Tropylium cation
Cyclopentadienyl cation

Answer :D
Discussion
36.

When calamine is heated then a product (A) is formed then find the total number of correct options for compound (A): (a) Compound (A) is white in cold conditions. (b) Compound (A) is yellow in hot conditions. (c) Compound (A) is called philosopher's wool. (d) Compound (A) when combined with CoO, then compound (B) is formed and colour of new compound (B) is green (e) Compound (B) is called Rinmann's green

Answer»


Solution :`ZnCO_(3) OVERSET(DELTA)RARR ZnO +CO_(2)uarr` All are correct.
Discussion
37.

When Benzoic acid is treated with LiAlH_(4) it for

Answer»

Benzaldehyde
Benzyl alcohol
Benzene
Toluene

Answer :B
Discussion
38.

What is gram equivalent weight of hydrogen peroxide as reductant?

Answer»

Solution :As reductant hydrogen perioxide oxidises to OXYGEN. `H_(2)O_(2) to O_(2)`
The CHANGE in oxidation number is 2
The molar mass =34G
GRAM equivalent weight of `H_(2)O_(2)=(34)/(2)=17g`
Equivalent weight =152
Discussion
39.

What makes lithium to show properties uncommon to the rest of the alkali metals ?

Answer»

Solution :The unusual PROPERTIESOF lithium as compared to other ALKALI metals is due to (i) the exceptionally small size of its atom and ion, (ii) HIGH polarising power (charge/size ratio) , (ii) high ionization ENTHALPY and (iv) absence of d-orbitals .
Discussion
40.

Which one of the following is an endothermic process ?

Answer»

`CH_4 + 2O_2 to CO_2 + 2H_2 O`
`H^+ + OH^(-) to H_2 O`
`NH_4 NO_3 OVERSET(H_2 O)to NH_4^(+) + NO_3^-`
`C + O_2 to CO_2`

SOLUTION :`NH_4 NO_3 overset(H_2O) to NH_4^+ + NO_3^(-)`
Discussion
41.

The root mean square velocity of a gas is double when temperature is

Answer»

increased four times
increase two times
reduced to half
reduced to ONE fourth

Solution :(a)`V(rms)=SQRT((3RT)/(M))orV_(rms)propsqrtT`
`(V_(rms))/(V'_(rms))=sqrt((T)/(T'))rArr(1)/(2)=sqrt((T)/(T'))rArrT'=4T`
Discussion
42.

What is not correct for SO_(2(g)) ?

Answer»

It is ANGULAR in shape
Both S - O BONDS are same
It decolorise the `KMnO_4` solution
It is DEHYDRATING agent

Answer :D
Discussion
43.

Which one has highest boiling point ?

Answer»

Butan-2-ol
Ethane
Butane
Pentane

Solution :Alcohols have HIGHER BOILING points than ALKANE due to H-Bonding.
Discussion
44.

What is reversible process? Give an example.

Answer»

Solution :The PROCESS in which the system and SURROUNDINGS cannot be RESTORED to the initial STATE from the final state is called a REVERSIBLE process eg. All the processes occurring in nature are irreversible processes.
Discussion
45.

Which will have a higher value of electronegativity for fluorine, the pauling scale or mulliken scale?

Answer»


Answer :MULLIKEN’s electronegativity `=2.8 XX` PAULING’s electronegativity so Mulliken’s VALUE will be LARGER.
Discussion
46.

The volume of a given mass of gas is 0.6dm^3. If its pressure is increased by 3 times and absolute temperature is increased by 5 times, what would be its new volume?

Answer»

SOLUTION : 1 `DM^(3)`
Discussion
47.

Which of the main functional group in the following ? (a) CH_(2)OH -CH_(2)-CHF-CH_(2)COOH (b) (CH_(3))_(2) CHCOCOOH (c ) CH_(3)CH_(2) underset(underset(NH_(2))(|))(C )HOH (d) CH_(3)COCH_(2)CH_(2)OH (e ) CH_(2)CH(NH_(2))COOH (f) CHOCH_(2)COCH_(2)CH_(3)

Answer»

Solution :(a) `-COOH` (B) `-COOH` (c ) `-NH_(2)` (d) `-CO-` (E ) `-COOH` (f) `-CHO`
Discussion
48.

Which of the following decarboxylates readily in the temperature range 100 - 150^(@)C ?

Answer»

`CH_(2) = CH.CH_(2)COOH`
`O_(2)NCH_(2)COOH`
`NC - CH_(2)COOH`
`CH_(3)COCH_(2)COOH`

Solution :SEE A - LEVEL INFORMATION of ACIDS
Discussion
49.

Which of the following decolourises bromine water and does not give white precipitate with AgNO_(3)?

Answer»

`C_(6)H_(6)`
`C_(2)H_(2)`
`C_(2)H_(4)`
`C_(2)H_(6)`

ANSWER :B
Discussion
50.

Which bond is more polar in the following pairs of molecules: (i) H_(3)C- H, H_(3)C- Cl (ii) H_(3)C- OH, H_(3)C-NH_(2) (iii) H_(3)C- SH, H_(3)C-OH

Answer»

SOLUTION :(i) `C-Cl` since Cl is more ELECTRONEGATIVE than H (ii) `C-O` (iii) `C-O`
Discussion