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 of the following compounds have the same type of hybridised carbon atoms?

Answer»

`CH_(2) = CH - CH= CH_(2)`
`HC -= C - C -= CH`
`CH_(3) - CH_(2) - CH_(2) - CH_(3)`
All

Answer :D
Discussion
2.

Write the application of chromatography

Answer»

Solution :(i) To PURIFY the compounds. (II) To separate mixture into their components (iii) To TEST the purify of compounds.
Discussion
3.

What is the empirical formula of Kaolin the percentage composition of which is as under : Al_(2)O_(3) = 39.5 %, SiO_(2)=46.6 %,H_(2)O=13.9 % (Atomic masses : Al = 27, Si= 28,O = 16,H=1) Hint : Radical mass of Al_(2)O_(3) = 102,SiO_(2) = 60,H_(2)O=18.

Answer»


Solution :Empirical formula of KAOLIN may be calculated as follows
`{:("Radical","Percentage","Radical mass","Radical ratio","SIMPLEST ratio","Simplest whole no. ratio"),("Al"_(2)"O"_(3),39.5,102,(39.5)/(102)=0.38,(0.38)/(0.38)=1.0,1),("SiO"_(2),46.6,60,(46.6)/(60)=0.78,(0.78)/(0.38)=2.05,2),("H"_(2)"O",13.9,18,(13.9)/(18)=0.77,(0.77)/(0.38)=2.03,2):}`
Empirical formula of Kaolin `= Al_(2)O_(3).2SiO_(2).2H_(2)O`.
Discussion
4.

Which of the following orders of properties is /are correct?

Answer»

`i)"Meltimng point of halides : "MF_(2)gtMCl_(2)gtMBr_(2)gtMI_(2)`
Basic characherter of oxides : `BEO lt MgO lt CaOgt SrOlt BAO`
Decreasing polariity :`CsFgt KF gtCaOgt Mgo`
Increasing IONIC character :`BeC_(2)lt Mg Cl_(2)lt CaCl_(2)`

Answer :2
Discussion
5.

Which will not result in a reaction?

Answer»

`C_6H_5OH + Br_2`
`C_6H_5OH + NAOH`
`C_6H_5OH + Na_2CO_3`
`C_6H_5OH + HNO_3 // H_2SO_4 `

SOLUTION :PHENOL will not REACT with CARBONATES
Discussion
6.

Which of the following reactions give meso product?

Answer»




Solution :Trans alkenes anti addition meso Remember (ATM)A=anti addition T=Trans symmetrical alkenes M = Meso
B) CIS alkene `UNDERSET(OH^(-)) OVERSET("cold" KMnO_4)to` cis hydrogenation `to 1 ` cis addition is anti additionracemic mixture (CAR) cis syn addition-meso
C) C) Trans alkene- epoxide formation with peroxidesepoxide on hydrolysis gives trans diols so anti addition Trans-anti addition (ATM) gives meso
D) Cyclo hexen is cis alkene anti addition racemic so (D) is not the CORRECT answer
Discussion
7.

Whichof the followingpairsof elements would you expectto havelowerfirst ionizationenthalpy ? Explain (i)CI or F (ii) CI or S(iii) K or Kr(iv) Kr or Xe

Answer»


SOLUTION :(i) BECAUSEOF thebigger size thestrongershieldingeffectCI haslower `Delta_(i) H_(1)` than F .
(ii)Amongs andCIS haslower `Delta_(i) H_(1)` due tobiggersize andlowernuclearcharge
(iii)K haslower `Delta_(i) H_(1)`than Ar hasconfiguration .
(iv)Xe becauseof itsbigger sizeand stronger shieldingeffecthas lower `Delta_(i) H_(1)` than Kr.
Discussion
8.

Which substance is used to stop radioactive rays ?

Answer»

SiC
WC
`CaC_2`
`Be_4C`

ANSWER :D
Discussion
9.

when benzyl chloride is boiled with aqueous KOH solution and the solution is acidified by a few drops of dilute HNO_(3) followed by AgNO_(3) solution, a white precipitate is formed. However, no such precipitate is noticed when the reaction is carried with chlorobenzene. explain.

Answer»

Solution :In case of `C_(6)H_(5)CH_(2)Cl`, the benzyl carbocation `(C_(6)H_(5) OVERSET(o+)(C)H_(2))` FORMED by releasing `Cl^(-)` ion is resonance stabilised. THEREFORE, the `C - Cl` bond can cleave to form `KCl`. HOWEVER, the phenyl carbocation `(C_(6)overset(o+)(H)_(5))` expected to be formed in case of chlorobenzene does not show any resonance. therefore, `C - Cl` bond does not cleave in case of chlorobenzene and no white precipitate is formed in this case.
Discussion
10.

Which cycloalkane is almost considered to be a planar molecule

Answer»

CYCLOHEXANE
CYCLOPROPANE
CYCLOPENTANE
cyclooctane

SOLUTION :Cyclopropane
Discussion
11.

(X) overset(O_(3)//Zn)underset(H_(2)O)toCO_(2)+CH_(3)-underset(O)underset(||)(C)-H+OHC -underset(O)underset(||)(C)-CHO X is

Answer»




SOLUTION :
Discussion
12.

When benzene reacts with excess of chlorine in the presence of anhy. AlCl_3, the product(s) formed

Answer»




HCl

Solution :With chlorine in PRESENCE of `AlCl_3`, electro philic SUBSTITUTION OCCURS
Discussion
13.

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne ?

Answer»

`NaNH_2`
HCL
`O_2`
`Br_2`

Solution :1-Butyne being a terminal alkyne has an acidic hydrogen and HENCE REACTS with `NaNH_2` to evolve `NH_3` GAS but 2-butyne does not .
Discussion
14.

Write the Lewis structure of hydrogen peroxide.

Answer»

SOLUTION :The LEWIS STRUCTURE of `H_2O_2` is
Discussion
15.

Under the same conditions how many mL of 1M KOH and 0.5M H_(2)SO_(4) solutions, respctively when mixed for a total volume of 100mL produce the highest rise in temperature

Answer»

`67:33`
`33:67`
`40:60`
`50:50`

ANSWER :D
Discussion
16.

Which of the following molecular type will have seesaw shape ?

Answer»

`AB_(2)E_(2)`
`AB_(3)E`
`AB_(3)`E
`AB_(5)E`

ANSWER :C
Discussion
17.

Which one of the following has the highest size?

Answer»

`MG`
`Mg^(2+)`
`AL`
`Al^(3+`

ANSWER :A
Discussion
18.

When is a precipitate formed when solutions of BaCl_(2) and Na_(2)SO_(4) are mixed ?

Answer»

SOLUTION :A PRECIPITATE is formed when in the final solution after mixing, the ionic product `[Ba^(2+)][SO_(4)^(2-)] GT K_(SP)` for `BaSO_(4)`.
Discussion
19.

What is shape of the orbital with (i) n = 2 and I = 0.

Answer»

SOLUTION :`N = 2 and I = 0`. The ORBITAL is 2s. Its shape is symmetrically spherical.
Discussion
20.

Which of the following metals is most commonly used in photochemical cells?

Answer»

Lithium
Calcium
Caesium
francium

Answer :C
Discussion
21.

Which is the correct ascending order for the acidic strength of methane, ammonia, water and hydrogen fluoride ?

Answer»

`HF GT gt H_2O gt gt NH_3 gt gt CH_4`
`CH_4 LT lt NH_3 lt lt H_2O lt lt HF`
`HF lt lt H_2O lt lt NH_3 lt lt CH_4`
`CH_4 lt lt HF lt lt H_2O lt lt NH_3`

ANSWER :B
Discussion
22.

Which of the following statements is correct about the reaction given below ? 4 Fe_((s)) +3O_(2(g)) rarr 2Fe_(2)O_(3(g))

Answer»

Total mass of iron and OXYGEN in reactants `=` total mass of iron and oxygen in product THEREFORE it FOLLOWS law of conservation of mass.
Total mass of reactants `=` total mass of product, therefore, law of multiple proportions is FOLLOWED.
Amount of `Fe_(2)O_(3)` can be increased by TAKING any one of the reactants ( iron or oxygen) in excess.
Amount of `Fe_(2)O_(3)` will decrease if the amount ofany one of the reactants ( iron or oxygen ) is taken in excess.

Solution :According to the law of conservation of mass,
The total mass of products `=` Total mass of reactants
The Amount of `Fe_(2)O_(3)` is decided by limiting reagent.
Discussion
23.

What is loam soil ?

Answer»

Solution :The SOIL containing 34% air, 66% water ALONG with HUMUS is called loam soil It is best for the crops
Discussion
24.

The species : H_(2)O,HCO_(3)^(-),HSO_(4)^(-) and NH_(3) can act both as Bronsted acids andbases. For each case give the corresponding conjugate acid and base.

Answer»

Solution :CONJUGATE acids : `H_(3)O^(+), H_(2)CO_(3), H_(2)SO_(4), NH_(4)^(+)`.
Conjugate bases : `OH^(-) , CO_(3)^(2-), SO_(4)^(2-), NH_(2)^(-)`.
Discussion
25.

Which one of the following is an example of homogeneous catalysis?

Answer»

HABER process of synthesis of ammonia
Catalytic conversion of `SO_(2)` to `SO_(3)` in contact process
Catalystic conversion of water gas to methanol
Acid HYDROLYSIS of methyl acetate.

Solution :In the acid hydrolysis of methyl acetate, the REACTANTS, products and the catalyst are all in the liquid PHASE.
Discussion
26.

The salt of an alkali metal gives violet colour in the flame test . Its aqueous solution gives a white precipitate with barium chloride in hydrochloric acid medium . The salt is

Answer»

`K_(2)SO_(4)`
`KCl`
`Na_(2)SO_(4)`
`K_(2)CO_(3)`

SOLUTION :K imparts VIOLET colour to the flame and `SO_(4)^(2-)` IONS produce white ppt. of `BaSO_(4)` when treated `K_(2)SO_(4) + BaCl_(2) to underset("White ppt.")(BaSO_(4)) darr + 2 KCl` with an aqueous solution of `BaCl_(2)` . Thus , option (a) is correct .
Discussion
27.

Which of the following sulphate salt have least solubility in water?

Answer»

`MgSO_(4)`
`BeSO_(4)`
`CaSO_(4)`
`BaSO_(4)`

Answer :D
Discussion
28.

Which of the following is classified as Z and trans-isomer?

Answer»




Solution :As PER C.I.P rules 4 MOLECULE is Z - isomer
Discussion
29.

Which one of the following is in solid state at room temperature ?

Answer»

BROMINE
MERCURY
BISMUTH
GALLIUM

SOLUTION :Bismuth
Discussion
30.

Discuss the trend of the following (i) Thermal stability of carbonates of Group 2 elements. (ii) The solubility and the nature of oxides of Group 2 elements.

Answer»

`BaCO_3 GT SrCO_3 gt CaCO_3 gt MgCO_3`
`BaCO_3 gt SrCO_3 gt MgCO_3 gt CaCO_3`
`CaCO_3 gt SrCO_3 gt MgCO_3 gt BaCO_3`
`MgCO_3 gt CaCO_3 gt SrCO_3 gt BaCO_3`.

SOLUTION :`BaCO_3 gt SrCO_3 gt CaCO_3 gt MgCO_3`
Discussion
31.

What is meant by isolated system? Give example.

Answer»

Solution :(i)A system which can exchange neither matter nor energy with its surroundings is CALLED an isolated system.
(ii) Here boundary is sealed and INSULATED.
(III) Hot WATER contained in a thermos FLASK, is an example for an isolated system.
Discussion
32.

Which one of the following compounds is most acidic?

Answer»

`CH_(3)CO_(2)H`
`C_(6)H_(5)CO_(2)H`
`C_(6)H_(5)OH`

Solution : Inductive effect and resonance.
Discussion
33.

Write Lewis symbols for the followint atoms and ions: S and S^(2-): Al and Al^(3+), H and H^(-)

Answer»

SOLUTION :
Discussion
34.

We are consuminga lot of electrical energy, solar energy etc. Do you, therefore, conclude that energy of the universe is continuously decreasing ?Explain. Which other thermodynamic quantity is continously increasing or decreasing ?

Answer»

Solution :No, energy of the universe remains constant( LAW of CONSERVATION of energy ) . ENTROPY of the universe iscontinuously increasing.
Discussion
35.

Which of the following ions can cause coagulation of proteins?

Answer»

`Ag^(+)`
`NA^(+)`
`MG^(2+)`
`Ca^(2+)`

Solution :COAGULATION of protein is CAUSED by `Ag^(+)` ions.
Discussion
36.

Very pure N_(2) can be obtained by

Answer»

thermal DECOMPOSITION of ammonium dichromate
treating aqueous solution of `NH_(4)ClandNaNO_(2)`
liquefaction and fractional DISTILLATION of LIQUID air
thermal decomposition of SODIUM azide

Solution :Pure `N_(2)` is obtained by thermal decomposition of sodium azide
`underset("Sod.azide")(2NaN_(3))to2Na+N_(2)`
Discussion
37.

Which of following compounds given same S_(N)1 and S_(N)2 product ?

Answer»




ANSWER :C
Discussion
38.

The substance not likely to contain CaCO_(3) is

Answer»

DOLOMITE
a marble STATUE
CALCINED gypsum
sea shells

Solution :Calcined gypsum is anhydrous `CaSO_(4)`.
Discussion
39.

When the bond not form between two atom as per VB theory ? Give e.g.

Answer»

Solution :If the atomic orbitals are not overlap an internuclear AXES than bond will not from.
s - p or `p_(x) - p_(y)` ZERO OVERLAPPING
Discussion
40.

Whichof thethefollowingis anexampleofeliminationreaction ?

Answer»

CHLORINATIONOF METHANE
Dehydrationof ethanol
Nitrationof benzene
hydrogenationof ETHYLENE

ANSWER :B
Discussion
41.

One mole of an ideal monoatomic gas at temperature T and volume 1L expands to 2L against a constant external pressure of one atm under adiabatic conditions, then final temperature of gas will be:

Answer»

<P>`(T)/(2^(2//3))`
`T + (2)/(3 XX 0.0821)`
T
`T - (2)/(3 xx 0.0821)`

Solution :Constant `P rArr` irreversibe
`Delta E= - P_("EXT") Delta V`
`nC_(V) Delta T = -P_("ext") (V_(2) - V_(1))`
` 1 xx (3)/(2) R xx (T_(2) - T_(1)) = -1(2-1) = -1`
`T_(2) = T- (2)/(3R)`
Discussion
42.

Which of the following reagents is useful to separate benzoic acid from phenol ?

Answer»

DILUTE HCl
Dilute `H_(2)SO_(4)`
5% `NaOH`
`5% NaHO_(3)`

Solution :`5 % NaHCO_(3)` REACTS with benzoic acid and not with phenol.
Discussion
43.

Which of the following statements are correct about CO_(3)^(2-) ?

Answer»

Thehybridisation of central atomis `sp^(3)`
Its RESONANCE structrue has cone C-O single
bond and two C= O double bonds
The average formal CHARGE on each oxygen atomin 0 . 67 units
All C-O bond length are equal .

Solution :HYBRIDISATION involved is `sp^(2)` . Hence ,(a) is wrong .
Resonance structure has both C-O bond of equallength . Hence , (b) is wrong.
formal charge on each O-atom = `(" TOTAL charge ")/(" No, of O-atoms " ) = (-2)/(3) = -0.67 ` units
All C-O bond lengths are equal as mentioned above .
Discussion
44.

Using VSEPR thory, drawthe molecular structures of OSF_(4) and XeF_(4)indicating the lacation of lone pair(s) of electrons and hybridisation of central atoms .

Answer»

SOLUTION :
Discussion
45.

Write the expression for Delta U under an adiabatic process.

Answer»

SOLUTION :`D U = Q + W, DU = W`.
Discussion
46.

The volume (in mL) of 0.1 M AgNO_(3) required to completely precipitat the chloride ions present in 30 mL of 0.01 M of [Cr(H_(2)O)_(5)Cl]Cl_(2), as silver chloride is close to :

Answer»


Solution :`underset(n_(1)=2)(2AgNO_(3))+[Cr(H_(2)O)_(5)Cl]Cl_(2)to [Cr(H_(2)O)_(5)Cl](NO_(3))_(2)+2AgCl`
`(M_(1)V_(1))/(n_(1))=(M_(2)V_(2))/(n_(2))`
`(0.1xxV)/(2)=(0.01xx30)/(1)`
V=6 mL
Discussion
47.

What could be the harmful effects of improper management of industrial and domestic solid waste in a city?

Answer»

Solution : If domestic waste in a city is not PROPERLY managed, it may find its way into sewers or may be eaten up by the CATTLE. The non-biodegradable waste like POLYTHENE bags, metal scrap etc. choke the sewers. The polythene bags if swallowed by the cattle can result into their death. Similarly, if industrial waste is not properly managed, it will cause pollution of the AIR, SOIL and water
Discussion
48.

What is diagonal relationship?

Answer»

SOLUTION :lithium and beryllium is more SIMILAR with the second element of the following group i.e., MAGNESIUM and aluminium, RESPECTIVELY. This sort of similarity is commonly referred to as diagonal relationship in the PERIODIC properties.
Discussion
49.

Explain amphoteric nature of water when it react with NH_3 and H_2S ?

Answer»
Discussion
50.

What is meant by EIA?

Answer»

Solution :In this system, HYDROGEN ATOM OSCILLATES between TWO directly linked POLYVALENT atoms.
e.g.,
Discussion