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 statement (s) for crystal having schottky defect is/are correct

Answer»

Schottky defect arises due to ABSENCE of CATION & anion from position which they are expected to occupy
The density of crystal having shottky defect is SMALLER than that of perfect crystal
Schottky defect are more common in co-valent compound with higher co-ordination number
The crystal having shottky defect is electrically neutral as a whole

Solution :Schottky defect is ony OBSERVED in IONIC compound
Discussion
2.

Write the tautomer of acetaldehyde and give its IUPAC name. Which of the two is more stable and why ?

Answer»

SOLUTION :
The tautomer, eth-1-en-1ol (i.e., vinyl ALCOHOL) is less stable than acetaldehyde because C = O `pi`-BOND `(364 KJ mol^(-1))` is MUCH stronger than C=C `pi`-bond `(254 kJ mol^(-1))`.
Discussion
3.

Which of the following is purifiedby vacuum distillation

Answer»

ETHANOL
GLYCERINE
BENZOIC acid
Chlorobenzene

ANSWER :B
Discussion
4.

Which energy level does not have a p-orbital ?

Answer»

SOLUTION :1ST ENERGY LEVEL.
Discussion
5.

Which of the following is not attacked by hot sodium hydroxide solution ?

Answer»

Silicon
Carbon
Tin
Lead.

Answer :B
Discussion
6.

Which of the following does give violet colour with neutral ferric chloride ?

Answer»

ACETIC acid
Salicylic acid
Formic acid
Benzoic acid

Solution :Because it CONTAINS `-OH` GROUP
Discussion
7.

What is the difference between 13-15 and 12-16 compounds ?

Answer»

Solution :Group 13-15 compounds such as AIP, GaAs, etc. have large covalent CHARACTER but Group 12-16 compounds such as ZnS, CDS, HgTe, etc.do not have perfect covalent bonds but POSSES SUFFICIENT ionic character. Howver, all of them are semiconductors.
Discussion
8.

What do you understand by 'auto-protolysis' of water? What is significance?

Answer»

Solution :AUTO-pyotolysis of water means 'self-ionisation' which PROCEEDS as FOLLOWS:
`"" underset("Acid-I")(H_(2)O(l))+underset("Base-II")(H_(2)O(l)) Leftrightarrow underset("Acid-II")(H_(3)O^(+)(aq))+underset("Base-I")(O^(-)(aq))`
Because of auto protolysis, water behaves both as a Bronsted acid and Bronsted base i.e. it is amphoteric in nautre
`"" underset("Acid-I")(H_(2)O(l))+underset("Base-II")(NH_(3)(l)) Leftrightarrow underset("Acid-II")(NH_(4)^(+)(aq))+underset("Base-I")(OH^(-)(aq))`
Discussion
9.

Why boron forms electron deicient compounds ?

Answer»

Solution :BORON has only THREE ELECTRONSIN the OUTER mostshell which itcan share with other atoms.Hence,in itscompounds, there areonly 6 electronspresent aroundB-atomi.e. ,i.e,octet is not complete.
Discussion
10.

The time taken for diffusion of CO_(2(g)) is twice than that of unknown gas of same volume under identical condition. Calculate the molecular weight of unknown gas. (C = 12, O = 16).

Answer»

11 gm/mol
176 gm/mol
88 gm/mol
22 gm/mol

Solution :`UNDERSET((t_(1)))("Unknown gas") "" underset((t_(2)))(CO_(2)" gas")`
`(r_(1))/(r_(2))=(V_(1)t_(2))/(V_(2)t_(1))=SQRT((M_(2))/(M_(1)))`
`V_(1)=V_(2) "" t_(2)=2t_(1)`
`(2t_(1))/(t_(1))=sqrt((44)/(M_(1)))`
`therefore 2=sqrt((44)/(M_(1)))`
`therefore 4=(44)/(M_(1)) "" therefore M_(1)=11" gm mole"^(-1)`
Discussion
11.

Which compound with react with Zn to form 2-butene ?

Answer»

2,3-DIBROMOBUTANE
1-2,-dibromobutane
2-butyne
none of these

Answer :A
Discussion
12.

Which of the following is paramagnetic with bond order 0.5

Answer»

`O_(2)`
`F_(2)`
`N_(2)`
`H_(2)^(+)`

ANSWER :D
Discussion
13.

Write the names of isotopes of hydrogen . What is the mass of these isotopes ?

Answer»

SOLUTION :Protium `""_(1)^(1)H`, Deterium `""_(1)^(2)H` or D, TRITIUM `""_(1)^(3)H` , or T. The mass ratio of protium, : deutrium : tritium =1:2:3
Discussion
14.

What is STP ?

Answer»

Solution :STANDARD TEMPERATURE and pressure means `273.15 (0^(@)C)`temperature and 1 BAR (i.e. exactly `10^(5)` pascal)pressure. These values approximate greezing temperature of water and ATMOSPHERIC pressure at sea level.
Discussion
15.

Write the structures of the following : (i) Acetone (ii) Ethylene glycol (iii) Sec-butyl alcohol.

Answer»

Solution :(i) `CH_(3)-OVERSET(O)overset(||)(C)-CH_(3)` (ii) `HO-CH_(2)-CH_(2)-OH`
(iii) `CH_(3)-UNDERSET(OH)underset(|)(CH)-C_(2)H_(5)`
Discussion
16.

The silver salt of a fatty acid on refluxing with an alkyl halides gives an

Answer»

acid
ester
ether
amine

Solution :SEE A -LEVEL INFORMATION
Discussion
17.

Which among the following is E-Isomer ?

Answer»




Solution :As PER CIP if same PRIORITY group are at opposite then the CONFIGURATION is E
Discussion
18.

Which oneof the followingelementsposeda challenge to Newlands 'slaw of octaves ? Li, Be , B , C , N , O ,F , Ne , Na

Answer»

SOLUTION :Newland'slaw ofoctavesstates thatwhen ELEMENTSARE arranged order of increasingatomicweights then theeveryeighth elementresemblesthe firstone . Butwhen innergas (NE wasdiscovered. Then it WASTHE ninthwhichresembles the firstone . Thereforethe elementinert gas Ne POSED a challange to Newlands's law ofoctaves.
Discussion
19.

The unit of entropy is ____

Answer»

SOLUTION :`J K^(-1) "MOL"^(-1)`
Discussion
20.

Which is correct of the following in structure of ? (i) 2-methyl-6-ethylnonance (ii) 6-ethyl-2-methylnonane (iii) 4-ethyl-8-methylnonane

Answer»

SOLUTION :(II) Because, the no. of substituents are written ACCORDING to ALPHABETICAL order
Discussion
21.

What is molar molecular volume at STP, if compressibility factor Z lt 1 ?

Answer»

Solution :Molar volume of Ideal gas decreases.
EX. `V_(m)=22.4` Lit at STP
When `Z lt 1`, then `V_(m)lt 22.4 L`
Discussion
22.

Which kind of defets are intorduced by doping ?

Answer»

Disolocation defect
Schottky defect
Frenkel defect
ELECTRONIC DEFECTS

Solution :Doping is done with ELECTRON RICH or electron deficit impuities. Hence, it INTRODUCES electronic defects.
Discussion
23.

When zeolite is treated with hard water, the sodium ions are exchanged with ......

Answer»

SOLUTION :`CA^(2+)` IONS and `MG^(2+)` ions
Discussion
24.

What is the dominant intermolecular force or bond that must be overcome in converting liquid CH_(3)OH to a gas ?

Answer»

Dipole-dipole interaction
Covalent BONDS
LONDON DISPERSION force
Hydrogen bonding

Solution :Hydrogen bonding
DUE to intermolecular hydrogen bonding in methanol, it ex.1st as ASSOCIATED molecule.
Discussion
25.

Which of the following compounds has the smallest bond angle in its molecule

Answer»

`NH_3`
`SO_2`
`OH_2`
`SH_2`

ANSWER :D
Discussion
26.

What is the percent composition of a mixture of (S)-(+)-2- butanol, [+-](25)/(D)=+13.52^(0), and (R)-(-)-2- butanol, [+-](25)/(D)=-13.52^(0), with a specific rotation [+-](25)/(D)=+6.76^(0)?

Answer»

75%(R) 25%(S)
25%(R) 75%(S)
50%(R) 50%(S)
67%(R) 33%(S)

SOLUTION :75%(R) 25%(S)
Discussion
27.

The unit of surface tension is

Answer»

`"DYNES CM"^2`
Ergs/cm 
JOULES `m^(-1)`
`N.m^(-1)`

SOLUTION :S.T. = `F/l = N/M.`
Discussion
28.

Which of the following representation of wave functions of molecular orbitals and atomic orbitals are not correct ?

Answer»

`Psi_(MO)=Psi_(A) PM Psi_(B)`
`SIGMA = Psi_(A) +Psi_(B)`
`sigma^(***)= Psi_(A) - Psi_(B)`
`Psi_(MO) = Psi_(A) xxPsi_(B)`

ANSWER :D
Discussion
29.

Which of the following reactions will evolve CO_(2)(g) as product ?

Answer»

Charcoal `overset("stream(excess)")(rarr)`
`HNCOoverset("hydrolysis")(rarr)`
`(C_(2)H_(5))_(2) CO_(3)overset(Delta)(rarr)`
`MgC_(2)O_(4)overset(Delta)(rarr)`

SOLUTION :B) `HNCO + H_(2) O rarr CO_(2) + HN_(3)`
d) `MgC_(2) O_(4) overset(Delta)(rarr) MgCO_(3) + CO`,
`CO + (1)/(2) O_(2) rarr O_(2) , MgCO_(3) rarr Mgo + CO_(2)`
Discussion
30.

Which of the following reaction has maximum Delta S value?

Answer»

`Ca_((s)) + (1)/(2) O_(2(g)) to CaO_((s))`
`CaCO_(3(s)) to CaO_((s)) + CO_(2(g))`
`C_((s)) + O_(2(g)) to CO_(2(g))`
`N_(2(g)) + O_(2(g)) to 2NO_((g))`

ANSWER :B
Discussion
31.

Which one of the following options does not represent ground state electronic configuration of an atom ?

Answer»

`1s^(2) 2s^(2) 2P^(2) 3S^(2) 2p^(6) 3d^(8) 4s^(2)`
`1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(9) 4s^(2)`
`1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(1)`
`1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(5) 4s^(1)`

Solution :Correct configuration (b) should be `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(1)` (for `._(29)Cu`)
Discussion
32.

Which of the following specles does not exert a reasonance effect ?

Answer»

`C_(6)H_(5)NH_(2)`
`C_(6)H_(6)overset(+)NH_(3)`
`C_(6)H_(5)OH`
`C_(6)H_(5)Cl`

Answer :C
Discussion
33.

Which element having 4 electronegativity ?

Answer»

LI
F
Cl
O

Answer :B
Discussion
34.

Water is polar in nature.

Answer»

Solution :EVEN though `SP^(3)` HYBRIDIZATION in there is `H_(2)O` but due to LONE pair - lone pair repulsion exists.
Discussion
35.

Which of the following reacts with silica ?

Answer»

`HF`
`HCL`
`HBR`
`HI`

ANSWER :A
Discussion
36.

Two moles of an ideal gas at 2 atmand 27^(@)Care compressed isothermally to halfthe volume by an externalpressure of4 atm. Calculate w, q and DeltaU.

Answer»


Solution :`V_("initial")= (nRT)/(P) = (2 mol xx 0.0821 L atm K^(-1) mol^(_1) xx 300 K)/(2 atm) =25.42 L, V_("final") = (25.42)/(2)= 12.71L`
`:. w = -P_(EXT) DELTAV=- 4 atm xx ( 12.71 -25.42) L= 4 xx 12.71 L atm= 50.84 Latm=50.84 xx 101.3 J= 5150 J`
Discussion
37.

Ionic ompounds like AgCl, CaF_2, and BaSO_4 are insoluble in water. This is because,

Answer»

ionic compounds are insoluble in water
the dielectric constant of water is very HIGH
water is not a GOOD ionising SOLVENT
these MOLECULES have high lattice ENERGY than hydration energy.

Answer :D
Discussion
38.

Which of the following compounds is paramagnetic

Answer»

`KO_2`
`SiO_2`
`TiO_2`
`BaO_2`

ANSWER :A
Discussion
39.

Which of the following is used as adsorbent?

Answer»

SILICA GEL and alumina
glass WOOL and cotton
glass PLATE and paper
glucose and fructose

Answer :A
Discussion
40.

Third period contain 8 elements. Fourth period contain 18 elements. Seven period contain 32 elements.

Answer»

Solution :For sixth PERIOD , `n = 6`
So, `LAMBDA = n - 1, lambda = 6 - 1 = 5 `

Total sub orbitals ` = 1 + 3 + 5 + 7 = 16`
Number of electronns = 32
` :. 32` elements present in 6th period.
ENERGY of orbital : `6s lt 4f lt 5d lt 6p`.
Discussion
41.

Which of the following reagents is used for decarboxylation of carboxylic acid ?

Answer»

`NaHCO_(3) + KCl`
`NaHCO_(3)+NACL`
`NaOH + CAO`
`NaOH + MgCl_(2)`

Solution :`(NaOH + CaO)` this is SODA LIME.
Discussion
42.

Which of the following is green house gas and also causes depletion of ozone layer

Answer»

CFCS
`CO_2`
`CH_4`
`H_2O`

ANSWER :A
Discussion
43.

The repeating unit of silicones

Answer»

Rsio
`R_(2)SIO`
`RSiO_(2)`
`R_(2)SiO_(2)R2SI`

Solution :The REPEATING unit of silicone is `R_(2) SiO`
Discussion
44.

What is Mayer's relation?

Answer»

<P>

Solution :The difference in MOLAR heat capacity values for a gas ut constant pressure `(C_(p))` and at constant volume`(C_(v))` is called Mayer.s RELATION
`C_(p)-C_(v)=R=` Molar gas consant.
For a monoatomic gas LIKE helium,`c_(p)=5R/2" and "C_(v)=3R/2`
Discussion
45.

Which of the following is an electrophilic reagent?

Answer»

`R UNDERSET(..)overset(..)(O)H`
`BF_(3)`
`NH_(3)`
`RO^(-)`

Answer :C
Discussion
46.

Which of the following reaction is catalysed by enzyme maltase

Answer»

STARCH`to`maltose
Maltose`to`glucose
Lactose`to`maltose
Maltose`to`glucose+fructose

Solution :Maltose`underset("enzyme")OVERSET("Maltose")to`Glucose
Discussion
47.

Which of the following has highest electron attraction capacity?

Answer»

`-CN`
`-CL`
`-OH`
`-NO_(2)`

ANSWER :D
Discussion
48.

Which of the following sets of quantum number is/are not possible ?

Answer»

`{:(n, l , m_l , m_s),(4,4,-2,+1//2):}`
`{:(n, l , m_l , m_s),(3,0,3,-1//2):}`
`{:(n, l , m_l , m_s),(3,2,-3,-1//2):}`
`{:(n, l , m_l , m_s),(5,3,0,+1//2):}`

Solution :In OPTION (a) .l. cannot EQUAL to .n. because VALUES of .l. lie between 0,1,2,3 …. (n-1)
In option (c) `m_l` cannot be - 3 for l = 2 because `m_1 =- 1` _____ 0 ______ `+ 1`
Discussion
49.

X underset(P_(2)O_(5))overset("Heat")rarr Malonic acid underset(432K)overset(Delta)rarr YX and Y in the above reaction sequence are

Answer»

`C_(3)O_(2), CH_(3)COOH`
`CO_(2), CH_(3)COOH`
`CO_(2), CO_(2)`
`CH_(3)CHO, CH_(3)COOH`

Solution :`underset("Malonic acid")(CH_(2) (COOH)_(2)) underset(DELTA)OVERSET(423 K)RARR underset((Y))(CH_(3) COOH) + CO_(2)`
`underset("Malonic acid")(CH_(2) (COOH)_(2)) overset(P_(2)O_(5))rarr underset((X))(O = C = C) = O + 2H_(2)O`
Discussion
50.

Which of the following is more stronger acid than Phenol ?

Answer»

Ethanol
Phenylethanol
p-Nitrophenol
p-Cresol

Solution :
Discussion