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 is an example for closed system?

Answer»

Hot water CONTAINED in a thermos flask
A gas contained in a CYLINDER fitted with a piston
All living things
Hot water contained in a open beaker

Answer :B
Discussion
2.

Which of the following can not produce acetyl chloride ?

Answer»

calcium acetate and sulphuryl chloride
acetic acid and `PCl_(5)`
acetic acid and `Cl_(2)//`RedP
sodium acetate and `POCl_(3)`

Solution :`CH_(3)COOH + Cl_(2) overset("Red P")rarr ClCH_(2) - COOH + HCL`
Discussion
3.

What weight of zinc would be required to produce enough hydrogen by reacting with dilute HCl to reduce completely 8.5 g of copper oxide to copper ?

Answer»


Solution :Zinc will react with an acid (say dilute HCl) to evolve hydrogen gas which will reduce copper OXIDE to copper
`Zn+2HClrarrZnCl_(2)+H_(2)`
`CuO+H_(2)rarrCu+H_(2)O`
`underset(65g)(Zn)+underset(63.5+16)(2HCl)+underset((=79.5g))(CuO)rarrZnCl_(2)+Cu+H_(2)O`
79.5 G of CuO require Zn = 65 g
8.5 g of CuO require `Zn=(65)/(79.5)xx8.5=6.95g`.
Discussion
4.

Write redox couples involved in the reactions (i) to (iv)given in question 31 .

Answer»

Solution :`(i) ZN(s)|Zn^(2+)(aq),CU^2+)(aq)|Cu(s)`
`(ii) MG(s)|Mg^(2+)(aq),Fe^(2+)(aq)|Fe(s)`
`(III)CI_(2)(g)|2CI^(-)(aq),2Br^(-)(aq)|Br_(2)(g)`
`(iv) Fe(s)|Fe^(2+)(aq),Cd^(2+)(aq)|Cu(s)`
Discussion
5.

Which of the indicated relationship is correct for the following exothermic reaction carried out at constant pressure? CO_((g)) + 3H_(2(g)) rarr CH_(4(g)) + H_(2)O_((g))

Answer»

`DELTA E = Delta H`
`Delta E gt Delta H`
`W LT 0`
`q gt 0`

Solution :`Delta n_(G) lt 0 rArr Delta H lt Delta E`
Discussion
6.

The standard oxidation potential of Zn ,Cu Ag and Ni electrode are +0.76 -034 -0.80 and +0.25 V respectively which of the following reaction will provide maximum volage ?

Answer»

`Cu + 2 Ag^(+) (aq)rarrCu^(2+)(aq)+2 Ag`
`Zn+2 Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag`
`H_(2)+Ni^(2+)(aq)rarr2H^(+)(aq)+Ni`
`Zn+2H^(+)(aq)rarrZn^(2+)(aq)+H_(2)`

Solution :The reduction potential of Zn Cu Ag and Ni are : 0.76,+0.34 +0.80 and -0.25respective ly the maximum e.m.f of the cell is OBTAINED when the ELECTRODE llpotential of the anode is minimum and that of the cathode is maximum i.e Zn and Ag respecitvely
`THEREFORE E.N.F =E_("cathode")E^(@)-E_("anode")^(@)`
=+0.80 -(-0.76)=+1.56V
thus option (b) iscorrect
Discussion
7.

The reducing power of a metal depends on various factors. Suggest the factor which makes lithium, the strongest reducing agent in aqueous solution.

Answer»

SUBLIMATION ENTHALPY
Ionisation enthalpy
Hydration ehthalpy
Electron GAIN enthalpy 

ANSWER :D
Discussion
8.

Write the structural formula of the following, (a) 2 - Butenamide B) Ethylethanote (c ) 2-Methyl-3-hexyne (d) Propanoic anhydric (e ) Pentan - 2,4 - dione

Answer»

Solution :(a) `CH_(3) - CH = CHCONH_(2)` (b) `CH_(3)COOC_(2)H_(5)` (C ) `CH_(3)CH_(2)C -= C UNDERSET(underset(CH_(3))(|))(C )HCH_(3)`
(d) `CH_(3)-CH_(2)-CO-O-OC- CH_(2)-CH_(3)` (e ) `CH_(3)COCH_(2)COCH_(3)`
Discussion
9.

Tick mark the wrong match.

Answer»

MORPHINE - narcotic
charas - hallucinogenic
cocaine - sedative
morphine - analgesic

Answer :C
Discussion
10.

The spectrum obtained from incandescent solids is

Answer»

CONTINUOUS 
LINE LIGHT 
BAND 
Absorption

Answer :A
Discussion
11.

Which one of the following statements about carbon monoxide is correct ?

Answer»

It has two lone PAIRS of electrons on oxygen atom
Carbon atom in it is SP hybridized
In formaing metal carbonyls, oxygen is attached
to the metal atom
It has LARGE value of diple moment

Solution :CO has the strucuture : `C underset(LARR)=O`: which involves sp
hybridisation of C-atom . Because of donation of
electron by O-atom to C-atom ,it has low polar
character and HENCE low dipole moment
` (0.39 C m/0.117 D)`.
Discussion
12.

Which of the following compound contain nitrogen atom in its -1 oxidation state ?

Answer»

`NH_(2)-NH_(2)`
`NH_(3)`
`NH_(4)OH`
`NH_(2)OH`

ANSWER :D
Discussion
13.

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be

Answer»

25.00 u
50.00 u
12.25 u
6.50 u

Answer :A::B::C
Discussion
14.

Which of the following statements regarding the above reaction is correct ?

Answer»

A & B are enantiomers.
Formation ofC involves E 1 cB.
Reaction is DISPROPORTIONATE reaction.
Rate determining step involves attack of BASE on aldehyde.

Solution :
Discussion
15.

Which of the following statements is/are false

Answer»

it is the isotropic nature of AMORPHOUS solids that all the bonds are of equal strength
Entropy of a crystalline SOLID is HIGHER than that of an amorphous solid
Amorphous solids have definite volume but not definite shape
Amorphous solids can become crystalline on slow HEATING (ANNEALING)

Answer :A::B::C
Discussion
16.

What is the difference between the forms .hydrolysis. and .hydration..

Answer»

Solution :(iii) Hydrolysis Reaction : Due to high dielectric constant, it has a very strong hydrating tendency. It dissolves many ionic compounds. However, certain covalent and some ionic compounds are hydrolysed in water.
`P_4O_(10(s)) + 6H_2O_((l)) to 4H_3PO_(4(aq))`
`SiCl_(4(l)) + 2H_2O_((l)) to SiO_(2(s)) +4HCl_((aq))`
`N_((s))^(3-) +3H_2O_((l)) to NH_(3(g)) + 3OH_((aq))^(-)`
(IV) Hydrates Formation: From aqueous solutions many salts can be crystallised as hydrated salts. Such an association of water is of different types viz.,
(i)Coordinated water e.g., `[CR(H_2O)_6]^(3+) 3Cl^(-)`
(II)interstitial water e.g., `BaCl_2. 2H_2O`
(iii) hydrogen-bonded water e.g., `[Cu(H_2O)_4]^(2+) SO_4^(2-) . H_2O` in `CuSO_4 . 5H_2O`
Discussion
17.

When acetylene is treated with ammonical cuprous chloride, a ............ precipitate of ............ is formed.

Answer»

SOLUTION :RED, COPPER ACETYLIDE
Discussion
18.

To explain the nature of radiation, James Clark Maxwell in 1864 put forward .Electromagnetic wave theory.. This theory could explain the phenomena of interference and diffraction but could not explain phenomena of black body radiation and photoelectric effect. Also, after the advent of electromagnetic wave theory, Rutherford.s model of atom suffered a serious drawback. To explain the phenomena of black body radiation and photoelectric effect, Max planck in 1900 put forward Planck.s quantum theory. BAsed on this theory, Neils Bohr in 1913 put forward Bohr.s model of atom which could overcome the drawback of Rutherford.s model and also explain the line spectral elements, especially the line spectra of hydrogen and hydrogen-like particles. Kinetic energy of the electron ejected when yellow light of frequency 5.2 xx 10^(14) s^(-1) falls on the surface of potassium metal (threshold frequency = 5 xx 10^(14) s^(-1)) is

Answer»

`1.325 XX 10^(-13) J`
`1.325 xx 10^(-20)J`
`1.325 xx 10^(-27) J`
`1.325 xx 10^(-34) J`

Answer :B
Discussion
19.

To explain the nature of radiation, James Clark Maxwell in 1864 put forward .Electromagnetic wave theory.. This theory could explain the phenomena of interference and diffraction but could not explain phenomena of black body radiation and photoelectric effect. Also, after the advent of electromagnetic wave theory, Rutherford.s model of atom suffered a serious drawback. To explain the phenomena of black body radiation and photoelectric effect, Max planck in 1900 put forward Planck.s quantum theory. BAsed on this theory, Neils Bohr in 1913 put forward Bohr.s model of atom which could overcome the drawback of Rutherford.s model and also explain the line spectral elements, especially the line spectra of hydrogen and hydrogen-like particles. Which of the following statements is incorrect about electromagnetic wave theory ?

Answer»

ENERGY is emiited continuously from the source
Radiations are ASSOCIATED with electric and magnetic fields
Radiations can travel even through vacuum
The velocity of any radiation depends UPON the nature of the radiation.

Answer :D
Discussion
20.

What does the following conditions reval ? i= 1 , lt 1 and I gt 1.

Answer»

Solution :For a solute that does not DISSOCIATE or ASSOCIATE the Van't Hoff factor is EQUAL to 1(i=1) and the molar mass
For the solutes that associates to form higher oligomers in solution the Van't Hoff factor will be less than one `(I lt 1) `and the observed molar mass will be GREATER than the actual molar mass For solutes that dissociates into their consituent ions the Van't Hoff factor will be more than one ` ( i gt 1) ` and the oberved molar mass will be less than the normal molar mass.
Discussion
21.

When excess of eletroyte is added to a colloid it

Answer»

Coagulats
precipitates
Gets diluted
Doe not change

Answer :A
Discussion
22.

Which components are present in stratosphere?

Answer»

Solution :TROPOSPHERE is made of turbulent, dusty zone containing air, much WATER VAPOUR and clouds.
Discussion
23.

Which Boiling Point is greater ? Give example.

Answer»

Solution :For `H_(2)O` :
`underset(100^(@)C(273 K))("NORMAL Boiling POINT")gt underset(99.6^(@)C(372.6K))("Standard Boiling Point")`
Normal Boiling point = 1 atm pressure
Standard Boiling point = 1 bar pressure
1 bar pressure `LT` 1 ATOM pressure.
Discussion
24.

Which methods are used to make water germ free?

Answer»

PASSING `Cl_2`
Passing of UV rays
By BLEACHING powder
All of these

Solution :All of these
Discussion
25.

What is the ("Mol wt")/("Eq.wt") ratio of Fe_(2)(SO_(4))_(3) being converted into Fe(OH)_(3)

Answer»


Solution :`overset(+3)(Fe_(2))(SO_(4))_(3)rarroverset(+3)(Fe)(OH)_(3)`
No change in oxidation Number
EQ. wt of `underset(("as SALT"))(Fe_(2)(SO_(4))_(3))=("MOL. wt. of "Fe_(2)(SO_(4))_(3))/(6)`
Discussion
26.

When borax is heated in a Bunsen burner flame with CaO on a loop of platinum wire , ayellow coloured Co(BO_2)_2 bead is formed.

Answer»

Solution :False STATEMENT :(BLUE COLOURED bead is FORMED )
Discussion
27.

Which of the following conditions favours the existence of a substance in the solid state ?

Answer»

HIGH TEMPERATURE
Low temperature
High THERMAL energy
Weak cohesive forces

Answer :B
Discussion
28.

When 1 litre of IM HCl is mixed with 1 litre of 1M NaOH, the rise in temperature was found to be T_1. In another experiment 1 litre of 0.5 M NaOH is mixed with 1 lit. of 0.5 M HCl. The rise in temperature was found to be T_2. Then

Answer»

`T_1 GT T_2`
`T_1 = 2T_2`
`T_1 = T_2`
`T_2 = 2T_1`

ANSWER :D
Discussion
29.

Two what type of system the following belong ? (i) Tree (ii) Pond(iii) Animals (iv) Tea placed in a kettle(v) Tea placed in thermos flask(vi) Tea placed in a cup.

Answer»

Solution :(i) Open SYSTEM (II) Open system (iii) Open system (IV) CLOSED system (v) isolated system (VI) open system.
Discussion
30.

The vander waals constants a and b of a real gas are 3.6L^2 atm mol^(-2) and 0.05L mol^(-1)respectively. If 200g of gas (molecular mass 40) is placed in 10L vessel at 300K, {:("Column-I ","Column-II "),("A) Pressure correction (atm) ","P) 0.25 "),("B) Free space for the molecules to move about(L) ","Q) 0.0125 "),("C) Actual volume of the gas molecules per mole (L) ","R) 0.9 "),("D) Effective volume occupied by total gas molecules (L) ","S) 9.75 "):}

Answer»


Solution :a) PRESSURE correction = P
`= (an^2)/(V^2) = (3.6 XX (200/40)^2)/((10)^2) = 0.9`.
b) Free space = `V_i = V = nb = 10 - 10 - 0.25 = 9.75`
c) Actual volume of gas MOLECULES = `5 xx V_m`
`b = 4 V_m implies V_m = b//4 = (0.05)/(4) = 0.0125//"mole"`
d) effective volume = `nb = 5 xx 0.05 = 0.25`.
Discussion
31.

Which of the following graphs is consistent with ideal gas behaviour?

Answer»





SOLUTION :`T_(1)gtT_(2)`
Discussion
32.

Which of the following is Radioactive element

Answer»

`RA`
`BA`
`CA`
`SR`

ANSWER :A
Discussion
33.

Which of the following conditions will favour maximum formation of the product in the reaction A_(2) (g) + B_(2) (g) hArr X_(2) (g), Delta _(r) H=-X kJ

Answer»

LOW temperature and high pressure
Low temperature and low pressure
High temperature and high pressure
High temperature and low pressure

Solution :As the reaction is exothermic , increase of temperature SHIFTS the EQUILIBRIUM in the backward DIRECTION or low temperature will shift the equilbrium in the forward direction . Furthr , as `n_(p) ltn_(r), ` high pressure will shift the equilibrium in the forward direction .
Discussion
34.

What starting material gives 5- and 6- membered rings through aldol cyclizations?

Answer»

ALPHA, beta- unsaturated aldehydes
1,4- and 1,5 -diketones
Diamides of dicarboxylic acids
Esters of dicarboxylic acid

Solution :Intramolecular ALDOL condensation
Discussion
35.

Wrute following reaction : (i) Ethyne + (Cl_(2) " or "Br_(2) + H_(2)O) rarr (ii) Hydration reaction of 1-butyne. (iii) Reaction of acetenelene with HCN. (iv) Hydrogenation of ethyne in presence of Lyndlar catalyst (Pd, BaSO_(4)). (v) Complete combustion of ethyne in presence of air. (vi) Reaction of propyne with alkaline KMnO_(4). (vii) Ozononolysis of ethyne.

Answer»

Solution :
(iii) `underset("Ethyne")(HC-=CH+HCN) OVERSET(Ba(CN)_(2))rarr underset("(Vinyl Cynide)")underset("Acylonitrile")(CH_(2)=CHCN)`
(IV) `underset("Ethyne")(HC-=CH)+H_(2) overset(Pd, BaSO_(4))rarr underset("Ethene")(CH_(2)=CH_(2))`
(v) `CH-=CH+(5)/(2)O_(2) rarr 2CO_(2) + H_(2)O + 1300 kJ`
(vi)
Discussion
36.

What kind of side effects observed, if among of fluoride in drinking water is more than 10 ppm.

Answer»

Solution : If the concentration of `F^-` is more than 10 PPM, it is hazardous to BONES and TEETH.
Discussion
37.

Thestep in which CI-CI bond homolysisoccurs is called ……………

Answer»

SOLUTION :initiationstep
Discussion
38.

Write two reactions to explain amphoteric nature of water.

Answer»

SOLUTION :Water is amphoteric in nature . It acts as an ACID in presence of strong base and as a base in presence of strong acids.
`underset("Base"_1)(H_2O_((l))) + underset("Acid"_2)(H_2S_((AQ)))to underset("Acid"_1)(H_3O_((aq))^+) + underset("Base"_2)HS_((aq))^(-)`
`underset("Aacid"_1)(H_2O_((l)))+underset("Base"_2)(NH_(3(aq))) tounderset("Aacid"_2)(NH_(4(aq))^(+))+ underset("Base"_1)(OH_((aq))^(-))`
Due to amphoteric character , water undergoes self IONISATION as following
`underset("Acid"_1)(H_2O_((l)))+underset("Base"_2)(H_2O_((aq))) hArr underset"(Conjugate acid)" underset("Acid"_2)(H_3O_((aq))^(+))+ underset"(Conjugate acid)"underset("Base"_1)(OH_((aq))^(-))`
Discussion
39.

Which of the following statements are correct? A) CH_2 = CH - CH = CH_2 underset(Br_2)overset(-40^(@)C)to B) CH_2 = CH - CH = CH_2 underset(Br_2)overset(-40^(@)C)to

Answer»

In the MAJOR PRODUCT is 3,4-dibromobut-1-ENE and minor product is 1,4-dibromobut-2-ene
In A the major product is 1,4-dibromobut-2-ene and 3,4-dibromobut-1-ene
In B the major product is 1,4-dibromobut-2-ene and minor product is 3,4-dibromobut -1-ene
In B the product is only 3,4-dibromobut-2-ene

Solution :In the major product is 3,4-dibromobut-1-ene and minor product is 1,4-dibromobut-2-ene, 9 In B the major product is 1,4-dibromobut-2 ene and minor product is 3,4-dibromobut-1-ene
Discussion
40.

Which of the following is redox reaction?

Answer»

1-Butyne `underset(BaSO_(4))overset(Pd//C-H_(2))to`
2-Butyne `overset(NaNH_(2))to`
1-Butyne `overset(Alc.KOH)to`
`HC-=CH underset("COPPER TUBE")overset("red hot")to`

Answer :A
Discussion
41.

Whatis interference ?

Answer»

SOLUTION :The COMBINATION of twoor moreelectromagneticwaveformsto FORMA resultan WAVE inwhichduedisplacementis eitherreinforcedor CANCELLED.
Discussion
42.

White fumes appear around the bottle of anhyd. AICI_3 due to the formation of

Answer»

HCL
`AL(OH)_3`
`Cl_2`
`Al_2 O_3`

ANSWER :A
Discussion
43.

Which element does not have any neutron in it ?

Answer»

SOLUTION :HYDROGEN
Discussion
44.

Which of the following statements indicates that law of multiple proportionsis being followed .

Answer»

Sample of carbon dioxide taken from any source will always have carbon and oxygen in the RATIO `1:2`.
Carbon forms two oxides namely `CO_(2)` and CO, where masses of oxygen which combine with fixed mass of carbon are in the SIMPLE ratio `2:1`.
When magnesium burns in oxygen , the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium OXIDE formed.
At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour.

Solution :The element carbon, combines with oxygen to form two compounds, carbon dioxide and carbon MONOXIDE. In `CO_(2)`, 12 parts by mass ofcarbon mix with 32 parts by mass of oxygen while in CO, 12 parts bymass of carbon combine with 16 parts by mass of oxygen.
Thus, the masses of oxygen combine with a fixed mass of carbon in CO and `CO_(2)` are 16 and 32 respectively these masses of oxygen bear simple ratio of `16:32`or `1:2` to each other.
This is an example of law of MULTIPLE proportion.
Discussion
45.

Which is used as autocatalyst:-

Answer»

`Al_(2)O_(3)`
`CaC_(2)`
`MnSO_(4)`
All of these

Solution :Addition of a few crystals of `MnSO_(4)` greatly accelerates the reduction by oxalic acid of purple `KMnO_(4)` to nearly colourless MANGANESE (II). When no manganese (II) ion is added, the REACTION initially proceeds slowly, but the rate gradually increases because the product manganese (II) autocatalyses the reaction.
`5H_(2)C_(2)O_(4)+2KMnO_(4)+3H_(2)SO_(4)to2MnSO_(4)+K_(2)SO_(4)+10CO_(2)+8H_(2)O`
Discussion
46.

Which of the following is incorrect regarding atomic radii ?

Answer»

`Na^(+)gt AL^(3+)lt Mg^(2+)`
`B lt Al gt Ga`
`Be lt Na gt CA`
`N lt P lt As`

SOLUTION :Generally from left to right atomic radii decreases and from top to BOTOM atomic radii increases.
Discussion
47.

The wrong statement in the following is

Answer»

Sulphonation of benzene takes place only with HOT concentrated sulphuric acid 
In the nitration mixture concentrated sulphuric acid is used for the formation of nitronium ion. 
Because of unsaturation benzene EASILY undergoes addition reactions 
Benzene burns with a SOOTY flame. 

ANSWER :C
Discussion
48.

Why Andrews Graph required ?

Answer»

Solution :It is ISOTHERMAL curve of,
Pressure `to` VOLUME of fixed temperature of GAS. It is USEFUL to derive liquification of gas in proper situation.
Discussion
49.

Which one of the following pairs of structures represent the phenomenon of resonance?

Answer»

`H_(2)C=CH-OVERSET(overset(O)(||))(C)-H, Coverset(+)(H_(2))-CH=overset(overset(O^(-))(|))(C)-H`
`CH_(2)=CH-overset(+)(CH)CL," "overset(+)(CH_(2))-CH=CH-Cl`
`(CH_(3))_(2)CH-overset(overset(O)(||))(C)-O^(-),(CH_(3))_(2)CH-overset(overset(O^(-))(|))(C)=O`
`CH_(3)-CH_(2)-overset(overset(O)(||))(C)-CH_(3), CH_(3)-CH=overset(overset(O^(-))(|))(C)-CH_(3)`

SOLUTION :A) `H_2C = CH- overset(O)overset(||)C-H , Coverset(+)H_2 - CH= overset(O^(-))overset(|)C-H`
B) `CH_2 = CH - overset(+)(CH)Cl , overset(+)(CH_2) - CH = CH - Cl`
C) `(CH_3)_2 CH - overset(O)overset(||)C-O^(-) , (CH_3)_2CH- overset(O^(-))overset(|)C=O`
Discussion
50.

Which of the following reactions of methane incomplete combustion :

Answer»

`2CH_4+O_2 overset"Cu/523 K / 100 atm"to 2CH_3OH`
`CH_4+O_2 overset(Mo_2O_3)to HCHO+H_2O`
`CH_4+O_2 to C(s) + 2H_2O (L)`
`CH_4+2O_2 to CO_2 (s) + 2H_2O (l)`

SOLUTION :COMPLETE combustion of `CH_4` gives `CO_2` and `H_2O` . THEREFORE , reaction (c ) in which `CH_4` is converted into C and `H_2O`is an incomplete combustion reaction.
Discussion