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.

When H_2O_2 is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand

Answer»

A blue colour is OBTAINED in ether due to FORMATION of `Cr_2(SO_4)_3`
A blue colour is obtained in ether due to formation `CrO_5`
A blue colour is obtained in ether due to formation of `CrO_3`
Chromyl chloride is formed

Solution :A blue colour is obtained in ether due to formation of `CrO_5`
`Cr_2 O_7^(-2) + 2H^(+) + 4H_2O_2 to 2CrO_5 + 5H_2O`
blue colour in ether
Discussion
2.

Which of the following factors will not distrub the equilibrium state of the reaction N_(2) (g) + O_(2) hArr 2NO(g) ?

Answer»

CHANGE in pressure
Change in temperature
Addition of catalyst
Addtion of `N_(2)`

Solution :Le-Chatelier.s principle
Discussion
3.

What is electron negativity ? How does it change in a period as well as in a group ?

Answer»

SOLUTION :The ability of an atom to attract the shared electron pair (of a COVALENT bond) in a molecule towards itself is called electro NEGATIVITY. In a period from LEFT to right the electro negativity increases. Down a group electro negativity value decreases.
Discussion
4.

Which one of the following reagent react with methyl magnesium iodide followed by acid hydrolysis to give ethyl acetate?

Answer»

Chlorodimethyl ETHER
ETHYL chloroformate
Ethyl FORMATE
ACETALDEHYDE

SOLUTION :Ethyl chloroformate
Discussion
5.

Which of the following statements is/are not correct?

Answer»

Metamerism BELONGS to the category of structural isomerism
Tautomeric STRUCTURES are the resonating structures of a molecule
Keto form is always more STABLE than the ENOL form
Geometrical isomerism is SHOWN only by alkenes

Solution :Tautomeric structures are the resonating structures of a molecule, Keto form is always more stable than the enol form, Geometrical isomerism is shown only by alkenes
Discussion
6.

What is the angular momentum of an electron in (i) 2 s orbital (ii) 4f orbital ?

Answer»

SOLUTION :Angular momentum of ELECTRON in any orbital `= SQRT(l(l + 1)) = (h)/(2pi)`
`:.` For 2 s orbital, `l = 0, " " :.` angular momentum `= sqrt(0(0 + 1)) (h)/(2pi) = 0`
For 4f orbital, `l = 3, " " :.` angular momentum `= sqrt(3(3 +1)) (h)/(2pi) = 2 SQRT3 (h)/(2pi) = sqrt3 (h)/(pi)`
Discussion
7.

Which of the following solutions will have pH close to 1.0?

Answer»

100 ML of M/10 HCl+100 mL of M/10 NaOH
55 mL of M/10 HCl+45mL of M/10 NaOH
10 mL of M/10 HCl+90mL of M/10 NaOH
75 mL of M/10 HCl+25mL of M/10 NaOH

Answer :D
Discussion
8.

The value of Delta G^(@) for the phosphorylation of glucose in glucolysis is13*8kj//mol. Find the value of K_(c) at 298 K.

Answer»

Solution :`DELTAG^(@) = 13*8 " Kjmol"^(-1)= 13*8 xx 10^(3)" J mol"^(-1)`
`Delta G^(@) = - 2*303" RT "log K_(c)`
`13*8 xx 10^(3) "J mol"^(-1) = -2*303 xx ( 8*314 " JK"^(-1)" mol"^(-1))(298 K) " log "K_(c)or log K_(c) = -2*4186 = bar(3)*5814`
`K_(c) = " ANTILOG " (bar(3)*5814) = 3*815 xx 10^(-3)`
Discussion
9.

Which of the hydrrides araea ionic ?

Answer»

`CaH_(2)`
`BaH_(2)`
`SrH_(2)`
all the above

Answer :4
Discussion
10.

Write the electronic configuration of Na and K.

Answer»

Solution :`NA (11) : 1 s^(2) 2s^(2) 2P^(6) 3s^(1)`
`K(19) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(1) K`
Discussion
11.

What material is used preparebullet proof vests ?

Answer»

Solution :When boron oxide is REDUCED with carbon in an ELECTRIC furnance, boron carbide `(B_(4)C)`is formed
`2B_(2)O_(3)(s) + 7 C (s) underset(1873 K)overset(" Electric furnace")rarrB_(4)C(s) + 6CO(G)`
Boron carbide is EVEN hardar than diamond . Therefore , it is used or making bullet-proof vests. It is also used as a shield or ratioactive radiations end also as an abrasive.
Discussion
12.

What will be the result if 100 mlL of 0.06 M Mg(NO_(2))_(2) is added to 50 ml. of 0.06 MNa_(2) C_(2) O_(4) ?[ Ksp of MgC_(2) O_(4) = 8.6 xx 10^(-5)]

Answer»

A precipitate will not be formed
A precipitate will form and an excess of `Mg^(2+) ` ions will remains in the solution
A precipitate willform and an excess of `C_2O_4^(2-) ` ions will remain in the solution
A precipitate will form but neither ion is present in excess

Solution :`[Mg^(+2) ] =0.06 M rArr [C_2O_4^(-2) ] =0. 06 M`
But after mixing
` M_1V_1 = M_2V_2 rArr0. 0 6 xx 100 = M_2 xx 150`
` [Mg^(+2)] =0.04 M rArr M_1 V_1 =M_2 V_2`
` 0.06 xx 50 = M_2 xx 150 rArr [C_2 O_4^(-2) ]= 0.02 M`
` {:(Mg^(+2)+, C_2O_4^(-2)hArr, MgC_2O_4),( 0.04 M , 0.02M , 0) ,( 0.02 , -,0.02M), (0.02M , , ):}`
` I.P =[Mg^(+2) ] [C_2O _4^(-2)]`
` =(4XX 10 ^(-2) ) (2xx 10 ^(-2)) = 8 xx 10 ^(_4) `
` thereforeK_(sp)LT I. P` , ppt will from
Discussion
13.

What is the lowest value of n that allows g orbitals to exist ?

Answer»

SOLUTION :For g-subshell, `l=4`, As `l=0` to `n-1`, to have `l=4`, MINIMUM VALUE of `n=5`.
Discussion
14.

The second orbit in He^+ ion has radius as the first orbit in hydrogen atom.

Answer»


ANSWER :T
Discussion
15.

Which of the following does not possess zero magnetic momentum ?

Answer»

Transvinly chloride
p-xylene
cis-but-2-ene
Methane

Answer :C
Discussion
16.

Use the periodic table to identify elements (a) With 5 electrons in the outer subshell (b) Would tend to lose two electrons (c) Would tend to gain two electrons

Answer»


ANSWER :(a)NITROGEN , (b)Magnesium , (c) OXYGEN
Discussion
17.

Write the IUPAC names of :

Answer»

SOLUTION :
Discussion
18.

Which of the following is not an artificial sweetener ?

Answer»

Aspartame
Sucrolose
Sucrose
Alitame

Answer :A
Discussion
19.

What is the valency possible to Arsenic with respect to oxygen and hydrogen?

Answer»


Answer :VALENCY w.r.t Oxygen is 5. Valency w.r.t hydrogen is 3
Discussion
20.

Which of the following is not a disadvantage of using hard water?

Answer»

In PRODUCTION of steam in boilers
Formation of SCALES in cooking utensils
In ion exchangers

Solution :In an ion exhanger using hard WATER is not a disadvantage since it BECOMES soft by exchanging ANIONS or cations.
Discussion
21.

When CO_(2) is bubbled into an aqueous solution of Na CO_(3).......... is formed

Answer»

`H_(2)O`
`OH^(-)`
`NaHCO_(3)`
`NaOH`

ANSWER :C
Discussion
22.

What happens when LiH reacts with Al_2C_(16)?

Answer»


ANSWER :`8LiH+Al_(2)Cl_(6) to 2LiAlH_(4)+6LiCl`
Discussion
23.

Why alkali metals and alkaline earth metals are called s-block elements?

Answer»

Solution :Alkali metals and alkaline earth metals (group 1 & 2) are those in which the last ELECTRON enters the OUTERMOST s-orbital. As the s-orbital can accommodate only TWO electrons, the two GROUPS belong to the s-block elements.
Discussion
24.

Which of the following reactions involve homogeneous equilibrium and which involve heterogeneous equilibrium ? Ag_(2)O_((s))+2HNO_(3(aq))hArr2AgNO_(3(aq))+H_(2)O_((l))

Answer»

SOLUTION :HETEROGENEOUS EQUILIBRIUM
Discussion
25.

Which of the following reactions involve homogeneous equilibrium and which involve heterogeneous equilibrium ? C_((s))+CO_(2(g))hArr2CO_((g))

Answer»

SOLUTION :HETEROGENEOUS EQUILIBRIUM
Discussion
26.

Which of the following reactions involve homogeneous equilibrium and which involve heterogeneous equilibrium ? CH_(3)COOC_(2(g))H_(5(aq))+H_(2)O_((l))hArrCH_(3)COOH_((aq))+C_(2)H_(5)OH_((aq))

Answer»

SOLUTION :HOMOGENEOUS EQUILIBRIUM
Discussion
27.

Which of the following reactions involve homogeneous equilibrium and which involve heterogeneous equilibrium ? 2SO_(2(g))+O_(2(g))hArr2SO_(3(g))

Answer»

SOLUTION :HOMOGENEOUS EQUILIBRIUM
Discussion
28.

Two metals (A) and (B) belongs to the same group of periodic table. Metal (A) forms an insoluble oxide but soluble sulphate. Metal (B) forms soluble oxide and insoluble sulphate. Then A and B are respectively

Answer»

`BA,Be`
`CA,Ba`
`Be, Ca`
`Be, NA`'

Answer :B
Discussion
29.

What is the coordination number of sodium in sodium oxide( Na_(2)O) ?

Answer»

6
4
8
2

Answer :B
Discussion
30.

Using curved-arrow notation, show the formation of reactive intermediates when the following covalent bonds undergo heterolytic cleavage. (a) CH_(3) - SCH_(3), (b) CH_(3) - CH, (c ) CH_(3) - Cu

Answer»

Solution :(a) Bonding electron pair transfer on more negative S.

(b) The sp carbon of `C -=` is more negative then `H_(3)O (sp^(3))`.

(c ) In COMPARE to ELECTROPOSITIVE Cu metal, the negativecarbon atom ACCEPT bonding electron pair
Discussion
31.

What is the relationshipbetweenq_(p) and q_(v) ?

Answer»

<P>

Solution :`q_(p)= q_(v)+Deltan_(g)`RTwhere `Deltan_(g)=n_(p)-n_(r)` (GASEOUS)
Discussion
32.

Which fo the following peresent E from?

Answer»




SOLUTION :N//A
Discussion
33.

Which of the following is a more stable carbocation?

Answer»

Sec. PENTYL CARBOCATION
Tert. Pentyl carbocation
Isopentyl carbocation
Neopentyl carbocation

Solution :Among the given CARBOCATIONS 30-pentyl carbocation is more stable DUE to more HYPER conjugations
Discussion
34.

What weight of HNO_3is needed to convert 5g of iodine into HIO_3according to the reaction I_(2)+HNO_(3) rarrHIO_(3)+NO_(2)+H_(2)O

Answer»

12.4g
24.8g
0.248g
49.6g

Solution :Eqts. of `HNO_3` = EQUIVALENTS of `I_2`
`(w)/(63//1)=5/(254//10)IMPLIES w = 12.4 G`
Discussion
35.

Total number of chiral carbon (Y) in following compounds.

Answer»


SOLUTION :
Discussion
36.

Whatismeant by entropy drivenreaction? How can the reaction with positivechange of enthalpy and entropydriven?

Answer»

Solution :The free energy change of a reaction is GIVEN by `DeltaG = DeltaH -TDELTAS`
For a reaction to be SPONTANEOUS, `DeltaG` shouldbe `-ve`.
If both `DeltaH`and `DeltaS` are positive, `DeltaG` can be`-ve` if `T Delta Sgt DeltaH`in magnitudee. Thus, entropy factor should dominate over enthalpyfactor. Such reactions are therefore, called entropy driven.This canhappen in either of the following two WAYS `:`
(i) `DeltaS` shoul beso learge that even if T is low , `T DeltaS` should be GREATER than`DeltaH`
(ii) If` DeltaS`is small, T should be so large that`T DeltaSgt DeltaH`
Discussion
37.

Which of the following ions will not undergo disproportionation?

Answer»

`CL^(-)`
`ClO_3^(-)`.
`ClO_4^(-)`.
`ClO^(-)`

Solution : Oxidation STATE of CHLORINE lies between -1 to + 7
`CI^(-)rarr(– 1)`It can undergo oxidation only.
`CIO_(4)^(-)(+7)`It can undergo reduction only.
THUS , `CI^(-)and CIO_(4)^(-)`ions cannot undergo disproportionation.
Discussion
38.

Which of the following elements is present as the impurity to the maximum extent in pig iron ?

Answer»

Phosphorus
Manganese
Carbon
Silicon

Solution :N//A
Discussion
39.

Which one of the following is used as a soil sterilizing agent?

Answer»

CHLOROFORM
CHLORAL
iodoform
Chloropicrin

Answer :d
Discussion
40.

When salt solution 'A' is treated with dilute HCI it gives off gas 'B', which when passed through a filter paper, moistened with potassium iodate and starch solution, gives deep blue colouration. 'A' and 'B' respectively are:

Answer»

`A = Na_(2)SO_(3)` and `B = SO_(2)`
`A = Na_(2)SO_(3)` and `B = CO_(2)`
`A = Na_(2)S` and `B = H_(2)S`
`A = NaHSO_(3)` and `B =SO_(2)`

ANSWER :A::C::D
Discussion
41.

Which of the following is a neutral salt ?

Answer»

`Na_3PO_4`
`CaSO_4`
` Na_2CO_3`
all the above

SOLUTION :NONE have H in then
Discussion
42.

Which of the following are true regarding hydroboration of alkene ?( More than one correct statements . )

Answer»

Reaction proceeds through ionic intermediat and syn`-`addition take place.
Reaction proceeds through cyclic INTERMEDIATE TRANSITION state and syn`-` addition takes place.
Reagent diborane in ether `(THF)` exists as `:`
.
Reagent exists in `THF` as BORANE `-THF` COMPLEX.

Answer :b.,d.
Discussion
43.

Which is not a use of plaster of pairs

Answer»

It isused in the manufacture of crucibles and models
It is used for setting of FRACTURED bones and teeth
It is used as good REDUCING agent
It is used in the manufacture of black BOARD chalks

Solution :Plaster of PARIS is not used as reducing agent.
Discussion
44.

Which among the following factors decreases the activation energy of a chemical reaction ?

Answer»

Pressure
Catalyst
Temperature
Concentration

Answer :B
Discussion
45.

The reactivity order towards hydrogenation of the following compounds is

Answer»

`I gt II gt III gt IV`
`II gt III gt IV gt I`
`III gt IV gt II gt I`
`IV gt III gt II gt I`

Solution :RATE of HYDROGENATION will decreases on increasing
Discussion
46.

Viscosity of a liuquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also given reason for the assigned order in one line.Water, hexane (CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3)),glycerine (CH_(2)OH CH (OH) CH_(2) OH)

Answer»

Solution :In `H_(2)O` and glycerine - Hydrogen bonding and dipole - dipole INTERACTIONS are present as polar molecules.
Hexane - Dispersion forces / LONDON forces exist in non - polar nature. Order of intermolecular forces is, hexane `lt` water `lt` glycerine.
Thus, hexane has WEAKEST intermolecular forces and glycerine the strongest intermolecular forces. Hence, hexane has minimum viscosity and glycerine has MAXIMUM viscosity.
Discussion
47.

Which of the following element is not consider as alkaline earth metal ?

Answer»

Be
MG
CA
RA

ANSWER :A
Discussion
48.

Which group is meta directing?

Answer»

`-C Cl_3`
`-OH`
`-NH_2`
`-CH_3`

SOLUTION :`-C Cl_3`
Discussion
49.

What is the pH of mix solution of ammonia and ammonium chloride ? Give equation.

Answer»

SOLUTION :This solution is basic buffer, So its pH is NEARER to pH `GT` 7 and 9.25.
pH=`pK_b+"LOG"(["Conjugate Acid," NH_4^+])/(["BASE", NH_3])`
Discussion
50.

The term not responsible for water pollution

Answer»

GREEN revaluation
BLUE REVOLUTION
Industrial revolution
Green chemistry

Answer :D
Discussion