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 is paramagnetic-

Answer»

`CN^(-)`
`NO^(+)`
`CO`
`CO_(2)^(-)`

Solution :MO electronic configuration of `O_(2)^(-)(17)`:
`K K(sigma_(2S))^(2)(sigma_(2s)^(**))^(2)(sigma_(2p_(z)))^(2)(pi_(2p_(x)))^(2)(pi2_(p_(y)))^(2)(pi_(2p_(x))^(**))^(2)(pi_(2p_(y))^(**))^(1)`
OWING to the presence of one UNPAIRED electron, it is paramagnetic in nature.
Discussion
2.

Which of the following has maximum neutralization enthalpy ?

Answer»

`NH_(4) and CH_(3) COOH`
`NH_(4) OH and HCI`
`KOH and CH_(3) COOH`
`KOH and HCI`

ANSWER :D
Discussion
3.

Write Lewis dot symbols for the following elements : Mg, Na, B, O, N, Br

Answer»

Solution :`overset(.)MG,""overset(.)NA,""overset(.)underset(.)B.,"".overset(..)underset(.)O:,"".overset(..)underset(.)N.,"".underset(..)overset(..)Br:`
Discussion
4.

The size of isoelectronic species-F^(-), Ne and Na^(+) is affected by ...

Answer»

nuclear charge (Z)
valence principal quantum number
ELECTRON- electron INTERACTION in OUTER ORBITALS
NONE of the factors because size is same

Solution :nuclear charge (Z).
Discussion
5.

Which element is the end product of every natural radioactive series?

Answer»

Pb
Sn
C
Bi

Solution :LEAD (Pb) is the end product of every NATURAL radioactive SERIES.
Discussion
6.

Which is the structural formula of 4-methyl-hex-5-yne-2-one?

Answer»

`CH_(3)-CO-underset(underset(CH_(3))(|))(CH)-CH_(2)-C -=CH`
`CH -=C -underset(underset(CH_(3))(|))(C H)-CH_(2)-CO-CH_(3)`
`CH -= C-CH_(2)-underset(underset(CH_(3))(|))(C H)-CO-CH_(3)`
`CH_(3)-CH_(2)-CO-underset(underset(CH_(3))(|))(CH)-C -=CH`

SOLUTION :`underset("4-methyl-hex-5-yne-2-one")(overset(6)(C )H-= overset(5)(C )-underset(underset(CH_(3))(|))overset(4)(C H)-overset(3)(C )H_(2)-overset(2)(C )O-overset(1)(C )H_(3))`
Discussion
7.

What is meant by 'demineralished water '?

Answer»

SOLUTION :Water free from all caption and anions is called demineralised water. Hard water is passed through caption EXCHANGE resin FOLLOWED by anion eexchange resin to FORM demeneralised water.
Discussion
8.

What do you understand by the following statements ? enthalpy of combustion of carbon disulphide is = -1065.2 kJ.

Answer»

SOLUTION :When 1 mole of `CS_(2)(1)` is COMPLETELY burnt in `O_(2)`, 1065.2 kJ of heat is liberated.
Discussion
9.

Which of the following is least acidic ?

Answer»

`C_(2)H_(5)OH`
`CH_(3)COOH`
`C_(6)H_(5)OH`
`ClCH_(2)COOH`

Solution :Order of acidic strength is
`C_(2)H_(5)OH lt C_(6)H_(5)OH lt CH_(3)COOH lt ClCH_(2)COOH`
Discussion
10.

Which one of the following sets of ions represents a collection of isoelectronic species ?

Answer»

`N^(3-),O^(2-),F^(-),S^(2-)`
`LI^(+),NA^(+),Mg^(+2),Ca^(+2)`
`K^(+),Cl^(-),Ca^(+2),Sc^(+3)`
`BA^(+2),Sr^(+2),K^(+2),Ca^(+2)`

Answer :C
Discussion
11.

Write the structure of isobutylene ?

Answer»

SOLUTION :`CH_(3)-UNDERSET(CH_(3))underset(|)(C)=CH_(2)`
Discussion
12.

What is environmental chemistry ?

Answer»

SOLUTION :It is the STUDY of CHEMICALS and CHEMICAL PROCESS.
Discussion
13.

What is hydrogen bonding?

Answer»

SOLUTION :Hydrogen BONDING is because of dipole-dipole interactions between the molecule in which hydrogen atom is covalently BONDED to a HIGHLY electronegative atom
Discussion
14.

Whereis the nodal planein P_(x ) ,P_(y) and P_(z) orbital ?

Answer»

SOLUTION :Thenodalplanein `p_(X )p_(y) p_(z)`prespectively in YZ.
zx andxy.
Note: The PLANE from twoaxesexceptpxorbital
Discussion
15.

Use of sodium carbonate is....

Answer»

in preparation of borex.
to CONVERT hard WATER into SOFT water.
in LAUNDRY.
All of above

Answer :D
Discussion
16.

Which of the following is not common property of Be and Al ?

Answer»

Their OXIDES are amphoteric
Their CHLORIDES are Lawis ACIDS
Both belongs to same group
They have strong tendency to from COVALENT bond

Answer :C
Discussion
17.

Which one of the following decomposes easily on heating ?

Answer»

`Na_(2)CO_(3)`
`K_(2)CO_(3)`
`Li_(2)CO_(3)`
`Rb_(2)CO_(3)`

ANSWER :C
Discussion
18.

Write the relationship between K_(sp) and S of an A_(2)B type of salt.

Answer»

Solution :Consider an electrolyte `A_(2)B`, WHOSE SOLUBILITY is S MOL `DM^(-3)`. In a saturated solution,
`A_(2)B_((s))hArr2A^(+)+B^(2-)`
`therefore[A^(+)]=2S" mol "dm^(-3)and(B^(2-))=S" mol "dm^(-3)`
`K_(sp)=[A^(+)]^(2)[B^(2-)]=(2S)^(2).S=4S^(3)`
`thereforeK_(sp)=4S^(3)`
Discussion
19.

What is the molarity of HCl solution that has a density of 1.17 g/mL at 25^(@)C?

Answer»

36.5 M
18.25 M
42.0 M
32.05 M

Solution :DENSITY of HCL solution `= 1.17g//mL`
1.17 G HCl dissolve in 1 mL `= 0.001` L solution
molarity `= (1.17)/(36.5xx0.001)=32.054M`
Discussion
20.

Which of the following is not correct ?

Answer»

Iodine oxidises sodium THIOSULPHATE to sodium tetrathionate
Sodium thiosulphate is soluble in WATER
Ozone is used to identify the presence of unsaturation in alkene
Sodium thiosulphate reacts with iodine to form sodium sulphate.

Solution :`I_(2)` reacts with `Na_(2)S_(2)O_(3)` to give sod tetrathionate
`I_(2)+2Na_(2)S_(2)O_(3)rarrNa_(2)S_(4)O_(6)+2NaI`
In this REACTION `I_(2)` acts as an oxidising agent.
Discussion
21.

The substances that cause depletion of ozone or make it thinner are abbreviated as

Answer»

TDS
GWP
ODS
BOD

SOLUTION :ODS
Discussion
22.

The TLV of CO is _____ppm.

Answer»


ANSWER :9
Discussion
23.

Which pair among the following is enantiomers

Answer»




All the above

Solution :
Discussion
24.

Which of the following statements regarding Friedel-Crafts reactions is wrong?

Answer»

ALKYLATION of benzene with an alkyl chloride requires only a CATALYTIC amount of a Lewis acidsuch as aluminum chloride
Alkylation of benzene with an ALCOHOL requires only a catalytic amount of a BRONSTED acid suchas phosphoric acid.
Acetylation of benzene with acetyl chloride requires only a catalytic amount of a Lewis acid.
Acetylation of benzene with ACETIC anhydride requires more than one equivalent of a Lewis acid.

Solution :Acetylation of benzene with acetyl chloride requires only a catalytic amount of a Lewis acid.
Discussion
25.

What is chlorosis?

Answer»

SOLUTION :Slowing down the formation of chlorophyll in plants DUE to presence of `SO_2` as POLLUTANT is called chlorosis.
Discussion
26.

When 20 ml of methane and 20 ml of oxygen are exploded together and the reaction mixture is cooled to laboratory temperature. The resulting volume of the mixture is

Answer»

40 ml
20 ml
30 ml
10 ml

Solution :`CH_(4)^((g))+2O_(2)^((g))rarrCO_(2)^((g))+2H_(2)O(l)`
`{:("Initial","20 ml","20 ml",-,-),("After reaction","10 ml",-,"10 ml",-):}`
Discussion
27.

Which of the following statements is /are incorrect about two organic compounds which are stereoiso iners?

Answer»

They MUST be enantiomers
They must be DIASTEREOMERS
They must be CONSTITUTIONAL isomers
They must have same molecular FORMULA

Solution :They must have same molecular formula
Discussion
28.

Which of the following is not an example of disproportionation reaction?

Answer»

`Cl_(2)+2NaOH to NaCl+NaOCl+H_(2)O`
`P_(4)+3NaOH+3H_(2)O to PH_(3)+3NaH_(2)PO_(2)`
`2NaPOH+2F_(2) to 2NaF+OF_(2)+H_(2)O`
`2H_(2)O_(2) to 2H_(2)O+O_(2)`

Answer :C
Discussion
29.

Which of the two ions Ca^(2+) " or " Zn^(2+) is more stable and why ?

Answer»


ANSWER :3
Discussion
30.

The volume occupied by 8.8 gm of CO_2 at 31.1^@C and 1 bar pressure (R = 0.083 "bar. It K"^(-1)mol^(-1)) is

Answer»

4 L 
50 L 
5.05 L 
0.505 L 

ANSWER :C
Discussion
31.

Which setsofionsis isoelectronic ?

Answer»

`NO^(+) , C_(2)^(2) CN^(-)N_(2)`
`CN^(-1)N_(2)O_(2) ^(-2)C_(2)^(-2)`
`N_(2) ,O_(2)^(-1) NO^(+) CO `
`C_(2)^(-2) O_(2)^(-1)CO, No`

Answer :A
Discussion
32.

Which one of the following does not contain neutron?

Answer»

 ORDINARY hydrogen
Heavy hydrogen
Radioactive hydrogen
Deuterium

ANSWER :a
Discussion
33.

The treatment of acetone with excess of RMgX gives:

Answer»

SOLUTION :`R - UNDERSET(OH)underset(|)OVERSET(R )overset(|)C-R`
Discussion
34.

The second ionization enthalpy is

Answer»

smaller than the FIRST ionization enthalpy
salmost equal to the first ionizationn enthalpy
smallerr than the third ionization enthalpy
equal to the SECOND electron GAIN enthalpy.

Answer :C
Discussion
35.

The volume of CO_(2) formed when a mixture of 2 mol NaHCO_(3) and 1 mol Na_(2)CO_(3) at STP, is-

Answer»

2 EQUIVALENT `H_(2)` gas
6 equivalent `O_(3)` gas
4 equivalent `O_(2)` gas
2 equivalent `Cl_(2)` gas

Answer :A::B::C::D
Discussion
36.

What is dry ice ? Why is it called so ? How to prepare a pure sample of CO ( Carbon monoxide ) ?

Answer»

Solution :Solid `CO_(2)` is called DRY ice.It is called dry ice because it directly changes into GASEOUS state without becoming liquid.
`"HCOOH" underset (373 K) OVERSET ("Conc" H_(2)SO_(4)) (rarr) CO+H_(2) O.`
Discussion
37.

Which of the following has the maximum number of unpaired electrons ?

Answer»

`Mg^(2+)`
`Ti^(3+)`
`V^(3+)`
`FE^(2+)`

Answer :D
Discussion
38.

Which of the following has the highest tendency to give the reaction M_((g))^+overset("Aqueous")underset("Medium")toM_((aq))^+

Answer»

Na
LI
Rb
K

Solution :HYDRATION ENERGY of Lit is more and HENCE Li is stabilized in AQUEOUS medium
Discussion
39.

which of the following molecules would have a carbon -halogen bond most suscptible to nucleophilic subsition ?

Answer»

2- fluourbutane
2- chlorbutane
2-bromobutane
2-iodbut ANE

SOLUTION :
Decreasing order of RATE of `S_(N^(2))` REATION .`
Discussion
40.

What are the conclusions of Rutherford's a-rays scattering expermiment?

Answer»

SOLUTION :(i)Rutherford bombarded a thin gold foil with a strea, of FAST moving a-particles.
(ii)It was observed that most of the a-particles passed through the foil.
(iii)Some of them were deflected through a small angle.
(iv)Very few a-particles were reflected back by `180^(@)`
(V)Based on these observations,he proposed that in an atom,there is a tiny positively changed NUCLEUS and the electrons are ,moving around the nucleus with high speed.
Discussion
41.

Write the resonance structures of ozone.

Answer»

SOLUTION :
Discussion
42.

Which of the following is heterolytic compound ?

Answer»

PYRROLE
FURAN
THIOPHENE
All the these

SOLUTION :N/A
Discussion
43.

When two molecules of an ideal gas collide

Answer»

heat is LIBERATED 
no heat is liberated 
heat is ABSORBED 
there is a DECREASE in the total K.E. 

ANSWER :B
Discussion
44.

Two moles of an ideal gas is expanded spontaneously into a vacuum. The work done is

Answer»

Zero
2J
4J
8J

ANSWER :A
Discussion
45.

Whichis thecorrectset of all fourquantumnumberforvalanceelectronof Na ?

Answer»

`1,-0,0, + (1)/(2)`
`2,1,1 + (1)/(2)`
`3,0 ,0 +(1)/(2)`
`3,1,0, +(1)/(2)`

ANSWER :C
Discussion
46.

Whichone iscorrectfor hydrogen

Answer»

The energyof 3dorbital is LESSTHAN 3p
The energyof 3porbital is LESS than 3d
Theenergyof 3s & 3pis lessthan 3d
3s,3p & 3d all ORBITALS have sameenergy

ANSWER :D
Discussion
47.

Why BeH_2 molecule has zero dipolemoment although the Be-H bonds are polar ?

Answer»

Solution :`BeH_(2)` is a linear molecule (H-Be-H) with bond angle equal to `180^(@)`.
ALTHOUGH Be-H bonds are polar on account of ELECTRONEGIVITY difference between Be (1.5) and H(2.1) atoms.
The bond polarities cancel each other. The molecule has resultant dipole moment of zero.
Discussion
48.

Which is the electrophile of the following ?

Answer»

`OVERSET(+)(N)O_(2)`
`overset(+)(C )H_(4)`
`CN^(-)`
`NH_(4)^(+)`

Answer :A
Discussion
49.

The % yield of Ammonia as a function of time in the reaction N_(2)(g) + 3H_(2)(g) hArr2NH_(3)(g), Delta H lt O " at " (P, T)is given below: If this reaction is conducted at T_(2) gt T_(1), then plot the % yield of NH_(3)as a function of time on same graph

Answer»

SOLUTION :Initially on increasing temperature the rate of REACTION increases, however since the reaction is exothermic therefore % yield of `NH_(30`GET decreased overall after a certain interval of TIME.
Discussion
50.

Which of the following compound(s) reduces chromates and dichromates?

Answer»

`SO_(2)`
`KI`
`CH_(3)CH_(2)OH`
CONC. `HCI`

Answer :A::B::C::D
Discussion