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 the weakest base?

Answer»

`(C_(2)H_(5))_(3)N`
`(C_(2)H_(5))_(2)NH`
`C_(2)H_(5)NH_(2)`
`NH_(3)`

Answer :D
Discussion
2.

The total number of contributing structures showing hyperconjugation (involving C-H bonds) for the carbocation given on R.H.S. is

Answer»


SOLUTION :
There are six (3+2+1) `ALPHA`-HYDROGENS and HENCE six hyperconjugation structures are POSSIBLE.
Discussion
3.

What is the value of 1 Å?

Answer»

SOLUTION :`1Å=10^(-10)m`
Discussion
4.

Which statement is not correct about alcohol?

Answer»

Ethyl alcohol is heavier than water
Ethyl alcohol evaporates more quickly
Alcohol with LESS NUMBER of carbon atoms is more soluble in water than alcohol with more number of carbon atoms
Alcohol produces `H_(2)` by reaction with sodium metal

Solution :Alcohol (ethanol) is less DENSER than water.
Discussion
5.

Which of the following metal oxides is anti-ferromagnetic in nature ?

Answer»

`MnO_(2)`
`TiO_(2)`
`VO_(2)`
`CrO_(2)`

SOLUTION :`MnO_(2)` = ANTIFERROMAGNETIC,`TiO_(2)` = Diamagnetic , ` VO_(2)` = Paramagnetic , ` CrO_(2)` = Ferromagnetic
Discussion
6.

What is ideal pressure and volume of real gas ?

Answer»

Solution :`(("Ideal GAS or"),("Real gas"))=(("Practically"),("measured"),("pressure"))+(("Correction in"),("pressure due"),("to attraction"))`
`p_("Ideal")=p_("real")+(an^(2))/(V^(2))`
`(("Ideal volume"),("of real gas"))=(("Practically"),("volume of"),("real gas"))-(("Correction"),("of"),("volume"))`
`V_("Ideal")=(V_("Real")-NB)`
Discussion
7.

Which of the following will have zero dipole moment?

Answer»

1, 1 -DICHLOROETHYLENE
cis-1,2-dichloroethylene
trans-1,2-dichloroethylene
none of these

ANSWER :C
Discussion
8.

Which of the following may not be present in all galvanic cells

Answer»

ELECTROLYTE
Cathode
Anode
Saltbridge

Answer :D
Discussion
9.

Which compound is used for the manufacture of chemicals like sodium perborate and percarbonate which are used in high quality detergents.

Answer»

`H_(2)S`
`H_(2)O_(2)`
`D_(2)O`
NaOH

Answer :B
Discussion
10.

Value of R is depend upon ? What is its unit ?

Answer»

Solution :Ideal GAS eq. pV = nRT `therefore R=(PV)/(NT)rArr` the VALUE of R depends upon UNITS in which p, V, n and T are MEASURED.
Discussion
11.

Which of the following have P-O-P bond ?

Answer»

HYPO PHOSPHOROUS acid
Phosphorous acid
Pyro PHOSPHORIC acid
Ortho phosphoric acid

Answer :C
Discussion
12.

What values of magnetic quantum number, m are permitted for an electron having angular momentum quantum number value, l = 2?

Answer»

SOLUTION :`-2, -1, 0, +1, +2`
Discussion
13.

Which is correct statement about X and Y.

Answer»

X is product of ionic REACTION and Y is product of RADICAL reaction
X and Y both are product of ionic reaction
X and Y both are product of radical reaction
X is product of radicalreaction and Y is product of ionic reaction

Solution :In the presence of peroxide, HBR undergoes FREE radical addition and HCl undergoes ELECTROPHILIC addition, because of H-Cl bond have high bond energy .
Discussion
14.

The Vividh Bharati station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (kilo hertz). Calculate the wavelength of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to?

Answer»

Solution :The wavelength, `lambda`, is equal to C/V, where c is the speed of electromagnetic radiation in vacuum and V is the frequency. Substituting the GIVEN VALUES, we have `V=c/V=(3.00xx10^8ms^(-1))/(1368 kHz)=(3.00xx10^8ms^-1)/(1368xx10^3s^(-1))=219.3m`It belongs to the radiowave region.
Discussion
15.

X,Y and Zare three members of a Doboreiner's triad . If the atomic mass of X is 7 and that of Z is 39 , what in the atomic mass of Y?

Answer»

23
7
46
39

Answer :a
Discussion
16.

The stability order of the following anions :

Answer»

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

Answer :B
Discussion
17.

Under similar conditions, what is the ratio of RMS velocity of ozone molecules and most probable velocity of oxygen molecules?

Answer»

Solution :RMS velocity of `O_3`molecules =
` SQRT((3 RT)/(M ) = sqrt((3RT)/(48))`
Mostprobablevelocityof `O_2` molecules=
` sqrt((2 RT)/(M))= sqrt((2RT)/(32))`
RATIOOF thevelocities`= sqrt((3 )/( 48 )) : sqrt((2 )/(32)) = 1:1`
Discussion
18.

Which one is not lyophobic in nature ?

Answer»

STARCH SOL.
WHITE of an EGG
Sulphur sol
`As_(2)S_(3)` sol.

Solution :Starch sol, egg white are LYOPHILIC sols.
Discussion
19.

Write strcutural formulas of the following compounds : (i) 3,4,4,5-Tetramethylheptane (ii) 2,5-Dimethylhexane

Answer»

Solution :(i) 3,4,4,5-Tetramethylheptane DETAILED structure as follows :
`overset(1)CH_(3)-overset(2)CH_(2)-overset(CH_(3))overset(|)(""^(3)CH)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(""^(4)C)-overset(CH_(3))overset(|)(""^(5)C)-overset(6)CH_(2)-overset(7)CH_(3)`
(II) 2,5-Dimethylhexane detailed structure as follows :
`overset(1)CH_(3)-overset(CH_(3))overset(|)(""^(2)CH)-overset(3)(CH_(2))-overset(4)(CH_(2))-overset(CH_(3))overset(|)(""^(5)CH)-overset(6)CH_(3)`
Or
Discussion
20.

Which of the following is present in maximum amount in acid rain?

Answer»

`HNO_3`
`H_2SO_4`
`HCL`
`H_2CO_3`

ANSWER :B
Discussion
21.

What is the oxidation number of nitrogen in (a) nitric acid (b) nitrous acid (c) nitric oxide (d) nitrous oxide (e) ammonia (f) N_2 ?

Answer»


Answer :(a) +5, (b) +3, (C) +2, (d) +1, (E) -3 ; nitrogen is more electronegative than H, (F) 0.
Discussion
22.

Which of thefollowingremainsunchangedon descending agroupin theperiodictable ?

Answer»

Valenceelectrons
ATOMICSIZE
DENSITY
METALLICCHARACTER

SOLUTION :Eachgrouphas afixednumber ofvalenceelectrons.
Discussion
23.

Which postulation provide the basic for the modern concepts regarding ion formation by electron transfer and the formation opf ionic crystalline compounds?

Answer»

KOSSEL's postulations
Langmulr's postulations
Newton's postulations
Lewis postulations

Solution :(a) Kossel's postulations PROVIDE the basic for the MODERN concepts regarding ion FORMATION by electontransfer and the formation of ionic crystalline compounds.
Discussion
24.

Why alkali metals are used as coolant in nuclear reactor ?

Answer»

Due to CONDUCTOR of heat
Due to INSULATOR of heat
Due to high electronegativity
Due to SMALLER ATOMIC size

Answer :A
Discussion
25.

Which is set of the following reagents would you select to convert C_(6)H_(5)COCH_(3) (acetophenone) to the following alcohol C_(6)H_(5)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-overset(Me)overset(|)(CH)-Me

Answer»

`CH_(3)CH_(2)CH_(2)MGBR` and ACID hydrolysis
`CH_(3)CHBrCH_(3)` and `AlCl_(3)`
`(CH_(3))_(2)CHMgBr` and acid hydrolysis
`CH_(3)CHOHCH_(3)` and Zn

Solution :
Discussion
26.

Which of the following reagents can not be used to distinguished between phenol and benzyl alcohol?

Answer»

`FeCl_(3)`
`NaHCO_(3)`
`Br_(2)//C Cl_(4)`
`NaOH`

Solution :`NaHCO_(3)` is a very weak BASE and hence does not react with either of the two compounds.
Discussion
27.

When 10 ml of 5M H_2O_2aqueous solution is decomposed at the S.T.P. volume of oxygen obtained is

Answer»

56ml
560ml
11.2ml
2.24ml

Answer :B
Discussion
28.

Whichof the followinghas highestvalueof ionicradius ?

Answer»

`Li^(+)`
`B^(3+)`
`O^(2-)`
`F^(-)`

Solution :NA
Discussion
29.

Using electron transfer concept identify the oxidant and redcutant in the following redox reaction (a) Zn(s)+2H^(+)(sq)rarrZn^(2)(aq)+H_(2)(g) (b)2[Fe(CN_(3))]^(4-)(aq)+H_(2)O_(2)(aq)+2H^(+)(aq)rarr 2[Fe(CN)_(6)]^(3-)-(aq)+2H_(2)O(l) (c )2[Fe(CN)_(6)]^(3-)(aq)+2OH^(-)(aq)+H_(2)O(aq)rarr2[Fe(CN)_(6)]^(4)+(aq)+O_(2)+2 H_(2)O(l) (d) BrO_(3)^(-)(aq) +F_(2)(g)+2 OH^(-)+2 OH^(-)(aq) rarr BrO_(4)^(-)(aq)+H_(2)O(l) (e )2NaCI_(3)(Aq)+L_(2)(aq)rarr2NaIO_(3)rarr 2NaIO_(3)(aq)+CI_(2)(aq)

Answer»

SOLUTION : (a)`H^(+) (B)H_(2)O_(2) (c )[Fe(CN)]_(6)^(3-)(d)F_(2) (E )NaCIO_(3)`
Reductants : (a) `Zn(b)[Fe(CN)]_(6)^(4-) (c )H_(2)O_(2)(d) BrO_(3)^(-) (e )I_(2)`
Discussion
30.

What are the effects of photochemical smog?

Answer»

Solution :(i) The three main components of photochemical smog are NITROGEN oxide, ozone and oxidised hydrocarbons like `HCHO, CH_2 = CH-CHO` and PAN.
(ii) Photochemical smog causes irritation to eyes, skin and lungs. It also increases the chance of asthma.
(iii) High concentration of ozone and NO can cause nose and THROAT iritation, chest pain, difliculty in breathing
(iv) PAN is toxie to plants, attack younger leaves and cause BRONZING and GLAZING of their surfaces.
(V) It causes corrosion of metals, stones, building materials and painted surfaces.
Discussion
31.

Write Lewis symbol for the following atoms and ions : S and S^(2-),""Al and Al^(3+),""H and H^(-)

Answer»

Solution :`:overset(..)UNDERSET(.)S.""overset(..)underset(..)S:^(2-),"".overset(.)Al. and Al^(3+),""overset(.)H and overset(..)H^(-)`
Discussion
32.

Write down the products of ozonolysis of 1,2-dimethylbenzene (o-xylene) . How does the result support Kekule structure of benzene ?

Answer»

SOLUTION :o-Xylene may be regarded as a resonance hybrid of the following two kekule structures. Ozonolysis of each one of these GIVES two productsas SHOWN below :

Thus, in all, THREE PRODUCTS are formed . Since, all the three products cannot be obtained from any one of the two Kekule structures, this shows that o-xylene is a resonance hybrid of the two Kekule structures (I and II)
Discussion
33.

Total pressure observed after opening the stopcock is [neglecting the volume of the tube connecting the two bulbs]

Answer»

1.33 ATM
3 atm
0.3 atm
0.75 atm

Solution :Total initial MOLES = final moles.
`(0.1 xx 2)/(RT) + (0.2 xx 1)/(RT) = (P xx 0.1)/(RT) + (P xx 0.2)/(RT)`
`implies P = (0.4)/(0.3) = 1.33 atm.`
Discussion
34.

Which of the following set of elements follows Dobereiner's law of triads ?

Answer»

Fe, Co, Ni
Li, Na, K
Ru, RH, Pd
Os, Ir, PT

Answer :B
Discussion
35.

Which statement is correct about the critical point of a phase diagram?

Answer»

SOLID, LIQUID and gas are present in EQUILIBRIUM.
Liquid and vapour are indistinguishable from one another.
Liquid can be produced by a change in PRESSURE.
Vapour can be produced by a change in temperature.

Answer :B
Discussion
36.

Which of the following is the condition for a non spontaneous reaction at high temperature but spontaneous at low temperature ?

Answer»

`{:(DELTAH, DELTAS),(-,-):}`
`{:(DeltaH, DeltaS),(+,+):}`
`{:(DeltaH, DeltaS),(+,-):}`
`{:(DeltaH, DeltaS),(-,+):}`

ANSWER :A
Discussion
37.

Which of the following options represents the correct bond order ?

Answer»

`O_(2)^(-) gt O_(2) gt O_(2)^(+)`
`O_(2)^(-) lt O_(2) lt O_(2)^(+)`
`O_(2)^(-) gt O_(2) lt O_(2)^(+)`
`O_(2)^(-) lt O_(2) gt O_(2)^(+)`

Solution :`O_(2)^(-) lt O_(2) lt O_(2)^(+)`
According to MOLECULAR ORBITAL theory (MOT)
` ""O_(2)^(-) "" O_(2) "" O_(2)^(+)`
Number of `E^(-) " :171615 " `
Bond order:1.522.5
Discussion
38.

What are the reacting conditions used for the formation of ethylene glycol from ethylene?

Answer»

Bromine water
Cold ALKALINE `KMnO_(4)`
dil `H_(2)SO_(4)//60^(@)C`
`O_(3)//H_(2)O`

Answer :B
Discussion
39.

Zn_((s)) + Cu_((aq))^(2+) to Zn_((aq))^(2+) + Cu_((s)). In this reaction, which gets oxidised?

Answer»

`CU^(2+)`
`Zn^(2+)`
Zn
`ZN,Cu^(2+)`

Solution :`Zn to Zn^(2+) + 2E^(-)`(LOSS of electron = oxidation)
Zn GETS oxidised
Discussion
40.

Which is expected to have highest melting point: PH_3 , NH_3 , (CH_3)_3,N? Explain.

Answer»

Solution :`NH_(3)` has the strongest intermolecular hydrogen bonding and it is expected to have the heighest melting point. Acutal melting points are: `NH_(3)=-77.7^(@)C,PH_(3)=-133^(2)C` and `(CH_(3))_(3)N=-117^(@)C`.
Discussion
41.

Write IUPAC names of the products obtained by addition reaction of HBr to hex-1-ene (i) in the absence of peroxide and (ii) in the presence of peroxide.

Answer»

SOLUTION :
Discussion
42.

What is meant by hctero (polar) covalent bond?

Answer»

Solution :In a COVALENT BOND if the PAIR of electrons are shared UNEQUALLY (asymmetrically) between that ATOMS are called polar covalent bond.
Discussion
43.

underset((A)"major product" overset(HBr)(to)(B)"major product")underset(darrH^(+)//heat)(CH_(3)-CH(CH_(3))-CH(OH)-CH_(3)) Identify A and B

Answer»

Solution :`CH_(3)-underset(CH_(3))underset(|)(C) H-underset(OH)underset(|)(C )H-CH_(3)OVERSET(H^(+))underset(Delta)(to)`
`CH_(3)-underset(CH_(3))underset(|)(C )H-CH=CH_(2)`
Discussion
44.

Whichof thefollowingmetalis usedtoremovesulphurfrompetroleum?

Answer»

BERYLLIUM
CALCIUM
BARIUM
MAGNESIUM

Answer :B
Discussion
45.

Which of the following compounds may give blood red colouration while performing Lassaigne's test for nitrogen?

Answer»

`(NH_(2))_(2)CO`
`(NH_(2))_(2)C=S`
`p-NH_(2)C_(6)H_(4)SO_(3)H`
`C_(6)H_(5)SO_(3)H`

Answer :B::C
Discussion
46.

Which quantum number does not follow from the solution of Schrodinger wave equation ?

Answer»

SOLUTION :SPIN QUANTUM NUMBER
Discussion
47.

Which of the following pair will diffuse at the same rate?

Answer»

`CO_2` and `N_2O`
`CO_2` and NO
`CO_2` and CO
`N_2O` and NO

Answer :a
Discussion
48.

What will happen if LiAlH_(4) is added to an ester ?

Answer»

Two units of alcohol are obtained
One UNIT of alcohol and one unit of acid is obtained
Two units of acids are obtained
None of these

Solution :`R - OVERSET(O)overset(||)(C) - R' overset(LiAlH_(4))rarr UNDERSET("Two units of alcohols")(R - CH_(2) OH + R' OH)`
Discussion
49.

Which of the following hydroxide is partially soluble in water ?

Answer»

LIOH
NaOH
KOH
RbOH

SOLUTION :LiOH is partially SOLUBLE, whereas, hydroxide of Na, K, Rb, and Cs are readily soluble in water.
Discussion
50.

What indicated by following figure ?

Answer»

<P>

Solution :As per FIG equilibrium is established between water and vapour. It is physical equilibrium `H_2O_((l)) hArr H_2O_((g))`at constant TEMPERATURE and volume `P_(H_2O)` = difference of height of mercury in MANOMETER.
Discussion