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.

There are certain substances which behave as normal, strong electrolytes at low concentration but at higher concentration they behave as colloidal solutions due to the formation of aggregated particles. Such colloids are called associated colloids and the aggregated particles are called micelles. Soaps and detergents are the example of associated colloids. the formation of micelles takes place above certain concentration called critical micellization concentration (CMC) and a characteristic temperature. Micelles are :

Answer»

EMULSIONS CUM gels
ASSOCIATED colloids
adsorbed catalyes
IDEAL solutions

ANSWER :B
Discussion
2.

What is atomic radius ?

Answer»

Solution :DISTANCE between ELECTRON and NUCLEUS is known as ATOMIC RADIUS.
Discussion
3.

Which of the following reaction has K_p=K_c ?

Answer»

`2HI_((g)) hArr H_(2(g)) + I_(2(g))`
`PCl_(5(g)) hArr PCl_(3(g)) + Cl_(2(g))`
`CH_3COOC_2H_(5(L)) + H_2O_((l)) hArr CH_3COOH_((l)) + C_2H_5OH_((l))`
`NH_4HS_((s)) hArr NH_(3(g)) + H_2S_((g))`

ANSWER :A
Discussion
4.

Whichof thefollowingstatementisINCORRECT?

Answer»

When pointdetermination , mechanicalstrringof paraffinoilis required.
Forboilingpointdetermination, theliquid( organic compound ) is takenin anignitionorfusiontube
theboilingpointof theliquidcorresponds to THETEMPERATUREAT whichthelastbubblecomesoutfromthe CAPILLARY andthe liquidrisesinto thecapillary .
Themeltingpointof thesolidcorresponds to thetemperatureat whichthe solidmeltscompletely.

Answer :A
Discussion
5.

Which of the following is (are) isolable?

Answer»




Solution :A) No. A three and a six-membered ring cannot be FUSED trans. The trans bonds on the potential BRIDGE head C's are too far apart to be bridged by a SINGLE carbon bridge
B) yes, large can be fused trans
C)No. cannot be fused trans
D) yes. Sprinanes are kinown for any size ring if they are ABLE to be at right angle.
Discussion
6.

The wave number of a particular spectral line in the atomic spectrum of a hydrogen like species increases 9/4 times when deuterium neuleus is introduced into its nucleus, then which of the following willbe the initial hydrogen like species?

Answer»

`LI^(2+)`
`Li^(+)`
`He^(+)`
`Be^(3+)`.

ANSWER :D
Discussion
7.

When an electron is transisted from 2E to E energy level, the wavelength of resultant photon produce is lambda. If electronic transition involves (4)/(3) E to e level, the wavelength of resultant photon is lambda_(2). The correct relation between lambda_(1) & lambda_(2) is lambda_(2) = x lambda_(1). Then find the value of x ?

Answer»


ANSWER :3
Discussion
8.

The solubility product of MgF_(2) is 7.4xx10^(-11). Calculate the solubility of MgF_(2) in 0.1M NaF solution

Answer»

`7.4xx10^(-9)`
`3.7xx10^(-9)`
`3.7xx10^(-11)`
`7.4xx10^(-11)`

ANSWER :A
Discussion
9.

Which of the following compounds can be used as anifreeze in automobile radiators?

Answer»

METHYL alcohol
GLYCOL
Nitrophenol
Ethyl alcohol

Solution :Glycol is USED as an anti-freeze in AUTOMOBILE RADIATORS.
Discussion
10.

Which of the following features are not shown by quartz glass ?

Answer»

This is a CRYSTALLINE solid
Refractive index is same in all the directions
This has definite heat of fusion
This is ALSO CALLED super cooled liquid

Solution :(a) is not correct because quartz GLASS is amorphous . (C ) is not correct because amorphous solids have no definite heat of fusion.
Discussion
11.

When organic substances undergo anaerobic degradation the product formed mainly is

Answer»

`CO_2`
`H_2S`
`CH_4`
NO

Answer :C
Discussion
12.

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions : (i) K and S (ii) Ca and O (iii) Al and N

Answer»

SOLUTION :
Discussion
13.

Which of the following show electromeric effect?

Answer»

Alkanes
Alkyl amines
Alkyl halides
Aldehydes

Solution :BASED on DEFINITION
Discussion
14.

Which of the following is contaminant responsible for Bhopal gas tragedy?

Answer»

`CO_2`
`SO_2`
`CH_3NCO(MIC)`
`O_3`

ANSWER :C
Discussion
15.

Which of the following product is formed when B is treated with hot and conc. NaOH?

Answer»

`NACI` and `NaCIO_(3)`
`NaOI` and `NaI`
`NaBr` and `NaOBr`
`NaIO_(3)` and `NaI`

SOLUTION :(A) `rarr NaCI`, (B) `rarr CI_(2)`
(C) `rarr SO_(2)CI_(2),` (D) `rarr H_(2)SO_(4)`,
(E) `rarr HCI`, (G) `rarr BaSO_(4)`
`underset(("Hot and conc"))(3CI_(2)+6NaOH rarr) 5NaCI +NaCIO_(3)+3H_(2)O`
Discussion
16.

Which of the following statement (s) is /are not true about the following decomposition reaction. 2KClO_3 rarr 2KCl+3O_2

Answer»

Potassium is undergoing oxidation
Chlorine is undergoing oxidation
Oxygen is reduced
None of species are undergoing oxidation or reduction

SOLUTION :`overset(+1+5+2)(2KClO_3)rarroverset(+1-1)(2KCl)+3overset(0)(O_2)`
(a) Since O.N. of potassium does not change , it neither undergoes oxidation nor reduction.
(B) O.N. of Cl decreases from +5 `(KClO_3)` to -1 (in KCl), THEREFORE , it is undergoing reduction.
(c) O.N. of O increases from -2 (in `KClO_3` ) to zero (in `O_2`) therefore , O is oxidised .
(d) This statement is not correct because Cl is undergoing reduction and O is undergoing oxidation.
Discussion
17.

The true peroxide of the following is

Answer»

`MnO_(2)`
`Rb_(2)O_(2)`
`PbO_(2)`
`NO_(2)`

SOLUTION :The true peroxideis `Rb_(2)O_(2)`
Discussion
18.

When alpha-rays hit a thin foil of gold, very few alpha-particles are deflected back. What does it prove ?

Answer»

Solution :There is a very SMALL HEAVY body PRESENT within the atom, called NUCLEUS
Discussion
19.

What is meant by setting of cement?

Answer»

Solution :When gypsum is added to CEMENT by mixing with an adequate quantity of water, it for PLASTIC mass that gets into a HARD solid in 5 to 10 MINUTES.
Discussion
20.

Which of the following organic compounds has same hybridization as its combustion product -(CO_(2)) ?

Answer»

Ethane
ETHYNE
Ethene
Ethanol

Solution :In ethyne `(CH -= CH)` both carbon atoms are sp HYBRID as the hybridisation of combustion PRODUCT, carbon atom of `O= C= O (CO_(2))`
Discussion
21.

TLV values of four pollutants A,B,C and D are 2ppm, 9 ppm, 20 ppm and 50 ppm. Among these four pollutants which one is the most toxic pollutant ?

Answer»

A
B
C
D

Solution :A
Discussion
22.

Which one of the following is not an isoelectronic ion?

Answer»

`NA^(+)`
`Mg^(2+)`
`Cl^(-)`
`O^(2-)`

ANSWER :C
Discussion
23.

What do you understand byallotropy ?

Answer»

SOLUTION :Allotropy : Allotropy is the existence of an ELEMENT in more than one form, having the same chemical properties but different physical properties. The various forms of an element are called allotropes. For example, carbon exists in three allotropic forms: DIAMOND, GRAPHITE and fullerenes.
Discussion
24.

The restricted rotation about carbon-carbon double bond in 2-butene is due to

Answer»

<P>Overlap of one s and `sp^(2)` HYBRIDIZED orbitals
Overlap of TWO `sp^(2)` hybridized orbitals
Overlap of one p and one `sp^(2)` hybridized orbitals
Sidewise overlap of two p-orbitals

Answer :D
Discussion
25.

Which one of the following alkaline earth metal carbonates is thermally the most stable ?

Answer»

`MgCO_(3)`
`CaCO_(3)`
`SrCO_(3)`
`BaCO_(3)`

Solution :As the electropositive character of the metal increases or the BASICITY of their hydroxides increases down the group, their thermal stability increases . THUS , `BaCO_(3)` is the most stable and HENCE option (d) is CORRECT .
Discussion
26.

Which of the following ion has maximum polarising power

Answer»

`Mg^(+2)`
`AI^(3+)`
`Na^(+)`
`CA^(+2)`

Answer :B
Discussion
27.

When a reaction is conducted in an open vessel, the heat of reaction is represented as

Answer»

`DeltaH`
`DeltaE` 
`PDELTAV`
`DELTA NRT`

ANSWER :A
Discussion
28.

Which of the following species cannot act as both Bronsted acid and base ?

Answer»

`H_(2)O`
`HCO_(3)^(-)`
`HSO_(4)^(-)`
`NH_(2)^(-)`

SOLUTION :`NH_(2)^(-)` can accept a proton but cannot GIVE a proton. Hence, it cannot act as both Bronsted acid and BASE.
Discussion
29.

Which one of the following equations represents the variation of viscosity coefficient (q) with temperature (T)?

Answer»

`(ETA) = AE^(-E//RT)`
`(eta) = Ae^(E//RT)`
`(eta) = Ae^(-E//kT)`
`(eta) = Ae^(E//T)`

ANSWER :A
Discussion
30.

What is one kilogram ?

Answer»



Solution :The weight of CYLINDER made up of PT - Ir Alloy kept at IBWM is called 1 KG.
Discussion
31.

The solubility productof a rare earth metal hydroxide M(OH)_3atroomtemperature is4.32 xx 10^(-14)its solubility is

Answer»

`2XX 10^(-3) M`
` 2.0 xx10^(-4) M`
` 2XX10^(-5)M `
` 2.0 XX 10^(-6) M`

SOLUTION :` M( OH)_3 hArr underset(S)M^(+3)= 3 underset( 3S) O H^(-) `
`KsP = (s) (3s) ^(3)= 274 ^(4)=4.32 xx 10 ^(-14), S =2 xx 10 ^(-4) `
Discussion
32.

Which reagents are suitable for following transformations?

Answer»


Answer :(a) & (c) (i) `BH_(3)*THF,(ii)H_(2)O_(2)//OH^(-)`
(b) & (d) Dil. `H_(2)SO_(4)` or (i) Hg `(OAc)_(2),H_(2)O`
(ii). `NaBH_(4)//OH^(ɵ)`.
Discussion
33.

Which of the following is not organic compound?

Answer»

DNA
Lipid
Glycogen
Bronze

Solution :It is an ALLOY and a MIXTURE of METALS and all other are ORGANIC COMPOUNDS.
Discussion
34.

What volume of hydrogen at STP required to reduce 7.95 grams of cupric oxide to give metal?

Answer»

SOLUTION :CUPRIC oxide is reduced to copper on treating with hydrogen
`CuO+H_(2)to Cu+H_(2)O`
1 mole of CuO =1 mole of `H_(2)`
79.5 grams of CuO=22.4 L of `H_(2)` at STP
7.95 grams of CuO=?
VOLUME of hydrogen required at STP `=(7.95)/(79.5) XX 22.4=2.24L`
Discussion
35.

When Ferrous sulphate acts as reductant, its equivalent weight is

Answer»

TWICE that of its MOLECULAR WEIGHT
equal to its molecular weight
one-half of its molecular weight
one-third of its molecular weight

ANSWER :B
Discussion
36.

Which of the following is NOT a redox reaction ?

Answer»

`CaCO_(3) RARR CaO + CO_(2)`
`O_(2)+2H_(2) rarr 2H_(2)O`
`Na+ H_(2) O rarr NaOH + 1//2 H_(2)`
`3H_(3) AsO_(3(aq)) +BrO_3^(-) (aq)rarr Br_((aq))^(-) + 3H_(3) AsO_(4(aq))`

Answer :A
Discussion
37.

Which among the following is softest metal and due to

Answer»

`Li lt Na gt K=Rb`
Li - due to SMALL size
Na - due to low ionisation potential
Cs - due to WEAK INTER atomic force of attraction

Answer :C
Discussion
38.

Which method can be applied to separate a mixture of camphor and benzoic acid?

Answer»

Sublimation
Chemical methods
Crystallisation
Extraction with solvent

Answer :B
Discussion
39.

Which of the following statements is/are correct for alkyl halide ?

Answer»

In most unimolecular reactions of alkyl HALIDE `S_N1` reactions is favoured over E1 reaction
E1 mechanism is favoured as compared to `S_N1` mechanism by branching at `BETA` carbon.
In unimolecular reaction, increasing the temperature FAVOURS E1 mechanism
E1 reactions are favoured by the use of weak bases and by the use of polar solvents.

Solution :All statement are correct.
Discussion
40.

Which of the following are soluble in water ?

Answer»

`Na_(2)CO_(3)`
`BaC_(2)O_(4)`
`MgCO_(3)`
`Ca(NO_(3))_(2)`

SOLUTION :According to hydration energy and LATTICE energy only `Na_(2)CO_(3) and Ca (NO_(3))_(2)` AMONG the given are soluble in water
Discussion
41.

What are the defects of Rutherford's model?

Answer»

SOLUTION :According to J.C. Maxwell, whenever an electron is subjected to acceleration, it emits radiation and loses energy. As a result of this, its orbit should BECOME smaller and smaller and finally it should drop into the nucleus by FOLLOWING a spiral path. This means that atom would collapse and THUS Rutherford.s model FAILED to explain stability of atoms. Another drawback of the Rutherford.s model is that it gives no information about the electronic structure of an atom.
Discussion
42.

Which of the following compounds is used for water softening ?

Answer»

`Ca_3(PO_4)_2`
`Na_3PO_4`
`Na_6P_6O_18`
`Na_2HPO_4`

Solution :The SODIUM hexametaphosphate is used for water SOFTENING. Its MOLECULAR FORMULA is
`Na_2[Na_4 (PO_3)_6] = Na_6P_6O_18`
`2CaCl_2 + Na_2 [Na_4 (PO_3)_6] to Na_2 [Ca_2(PO_3)_6] + 4NaCl`
Discussion
43.

When 120mg of naphthalene C_(10)H_(8(s)) was burnt in a bomb calorimeter, the temperature rise was 3.05K. Calculate the calorimeter constant and molar standard internal energy change of combustion. Also report by how much will the temperature rise when 100mgof Phenol (C_(6)H_(5)OH_((s))) is burnt in the same calorimeter under the same conditions, if heat liberated is 3962.85J ? (DeltaH_(C)^(@) fo r C_(10)H_(8)=-5157kJ mol^(-1))

Answer»


ANSWER :`DeltaH=1585.14JK^(-1),DeltaU=-5152.0kJ MOL^(-1), DeltaT=2.5K;`
Discussion
44.

Which structure is named as 3-chlorocyclobut-1-ene?

Answer»




ANSWER :C
Discussion
45.

Who proposed that the attainment of stable electronic configuration in molecules are achieved by mutual sharing of electrons ?

Answer»

G.N. LEWIS
PAULING
Hess
Van't Hoff

ANSWER :a
Discussion
46.

Which of the IVA group element does not exhibit allotropy ?

Answer»

C
Si
Sn
PB

Solution :Pb does not EXHIBIT ALLOTROPY
Discussion
47.

The total number of electrons that take part in forming bonds in O_2 molecule according to V.B.T.

Answer»

2
4
6
10

Answer :B
Discussion
48.

Which are alicyclic or closed chain or ring compounds? Give examples

Answer»

Solution :(a) ALICYCLIC (ALIPHATIC cyclic) compounds: These compounds CONTAIN carbon atoms joined in the form of a RING

(b) HETEROCYCLIC compounds: In a ring of compounds somethimes atoms other than carbon are also present in the ring is known as heterocyclic compounds.
Discussion
49.

When is DeltaH=Deltau in a reaction?

Answer»


ANSWER :`H_(2(G))+I_(2(g))hArr2HI(g)`
Discussion
50.

The solubility on any substance in water may be classified as : Molecular ability: AB(s/l/g) overset(aq)iffAB(aq) Ionic solubility : AB (s/l/g) overset(aq)iff A^(+)(aq)+B^(-)(aq) For a substance AB(s) the following thermodynamic informations are available at 300K: Molecular solubility: Delta H^(@)=+20kcal/mol, DeltaS^(@)=+40kcal/K-mole Ionic solubility: DeltaH^(@)=-25 kcal/ mol, DeltaS^(@)=-50 cal/K-mole The equilbrium constant for the ionic and molecular solubility of AB(s) in water at 300K are respectively:

Answer»

`E^(50//3),e^(-40//3)`
`10^(50//3),10^(-40//3)`
`e^(-50//3),e^(40//3)`
`10^(-50//3),10^(40//3)`

ANSWER :a
Discussion