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.

What is Boyle.s temperature ? Give its relation with value of Z.

Answer»

Solution :Boyle point : The temperature at which a real GAS obeys ideal gas law over an appreciable range of pressure is called Boyle temperature or Boyle point.
Boyle point of a gas depends upon its nature.
Their Boyle point, real gases show positive deviations from IDEALITY and Z values are greater than one `(Z gt 1)`. ATTRACTION forces are weak.
Below Boyle temperature real gases first show decrease in Z value with increasing pressure, which REACHES as minimum value.
Discussion
2.

Which of the following has correct increasing basic strenght ?

Answer»

`MgO LT BEO lt CaO lt BAO`
`BeO lt MgO lt CaO lt BaO`
`BaO lt CaO lt MgO lt BeO`
`CaO lt BaO lt BeO lt MgO`

Solution :`BeO lt MgO lt CaO lt BaO. ` The basic CHARACTER of the oxides increases down the GROUP.
Discussion
3.

Which of the following ions is the most stable?

Answer»

`Sn^(2+)`
`Ge^(2+)`
`SI^(2+)`
`Pb^(2+)`

ANSWER :D
Discussion
4.

The wavelength of a radiation emitted by a sodium lamp is 600 nm. Find the frequency ?

Answer»

Solution :GIVEN `lambda = 600nm`
Frequency `V = ?`
`"We know that V"= (C)/(lambda)=(3.0xx10^(8)ms^(-1))/(600xx10^(-9)m)=5XX10^(14)S^(-1)`
Discussion
5.

Which of the following species can function both as oxidizing as well as reducing agent?

Answer»

`CL^(-)`
`ClO_(4)^(-)`
`CIO^(-)`
`MnO_(4)^(-)`

ANSWER :C
Discussion
6.

Write the IUPAC names of the following compounds. (i) (C Cl_(3))_(3)C Cl (ii) (CH_(3))_(3)C CH=C(Cl)C_(6)H_(4)I-p.

Answer»


`

SOLUTION :(i) `(C Cl_(3))_(3)C Cl`

(ii) `(CH_(3))_(3)C CH=C(Cl)C_(6)H_(4)I-p`,
.
Discussion
7.

Which of the following compounds contain (s) no covalent bond (s) ? KCl, PH_(3),O_(2), B_(2), H_(6), H_(2)SO_(4)

Answer»

`KCl,B_(2)H_(6), PH_(3)`
`KCl, H_(2) SO_(4)`
`KCl`
`KCl, B_(2), H_(2)`

SOLUTION :`K^(+) and CL^(-) ` in KCl have ionic bond while all other
compounds contain covalent bond .
Discussion
8.

What are metallic hydrides? Explain about it.

Answer»

Solution :(i) METALLIC hydrides are obtained by hydrogenation of metals and alloys in which hydrogen occupies the interstitial sites (voids). Hence, they are called interstitial hydrides.
(ii) The hydrides show properties similar to parent metals and hence they are also KNOWN as metallic hydrides.
(iii) They are mostly non-stoichiometric with variable composition (`TiH_(1.5-1.8)`and `PdH_(0.6-0.8)`).
(iv) Some are relatively light, inexpensive and thermally unstable which makes them useful for hydrogen STORAGE applications. Example, `TiH_(2)`, `ZrH_(2)`, `ZnH_(2)`.
Discussion
9.

Which of the following shows geometrical isomerism ? (i)CHCl=CHCl , (ii)CH_2=C Cl_2 , (iii) C Cl_2=CHCl Give structures of its cis- and trans-forms.

Answer»

Solution :Only (i), i.e., CICH=CHCl has two DIFFERENT substituents on each carbon atom of the double BOND and HENCE show GEOMETRICAL isomerism.

The other two compounds, i.e., (ii) and (iii) do not show geometrical isomerism because one of the carbon atoms of the double bond in each case has two IDENTICAL atoms, i.e., Cl atoms.
Discussion
10.

Which of the following oxide is unstable

Answer»

`Li_(2)O`
`Li_(2)O_(2)`
`Na_(2)O_(2)`
`KO_(2)`

Answer :B
Discussion
11.

Which is polymeric hydride ?

Answer»

`CaH_(2)`
`MgH_(2)`
`BaH_(2)`
`SrH_(2)`

ANSWER :B
Discussion
12.

The term that corrects for the attractive forces present in a real gas in the van der Waals equation is

Answer»

NB
`(an^(2))/(V^(2))`
`-(an^(2))/(V^(2))`
`-nb`

ANSWER :B
Discussion
13.

What , is the numberof photonsof ligthwith awavelengthof 400pm thatprovide1 j ofenergy

Answer»

Solution :Wavelength`(LAMBDA)= 400 pm:. , 1 pm = 10^(12) m`
Energy(E ) = 1J
If numberof photon =N
energyof Nphoton= `(Nhc )/(lambda ) = E`
`N = (E xx lambda )/( hc )`
`=(11xx 4000 xx 10^(12)m)/( 6.626 xx 10^(34) j s xx3.0xx 10^(8) MS^(-1))`
2.012 `xx10^(16)`number ofphoton
Discussion
14.

What is the correct representation of reaction occurring when HCl is heated with MnO_(2) ?

Answer»

`MnO_(4)^(-)+5Cl^(-)+8H^(+)RARR Mn^(2+)+5Cl^(-)+5H_(2)O`
`MnO_(2)+2Cl^(-)+4H^(+)rarr Mn^(2+)+Cl_(2)+2H_(2)O`
`2MnO_(2)+4Cl^(-)+8H^(+)rarr 2 Mn^(2+)+2Cl_(2)+4H_(2)O`
`MnO_(2)+4HCl rarr MnCl_(4)+Cl_(2)+H_(2)O`

SOLUTION :`MnO_(2)+4HCl rarr MnCl_(2)+Cl_(2)+2H_(2)O`
or in IONIC form `MnO_(2)+2Cl^(-)+4H^(+)rarr Mn^(2+) + Cl_(2) + 2H_(2)O`
Discussion
15.

Which of the following is/are correct for a solution of a particular concentrations ?

Answer»

MOLARITY is always LESS than molality
Formality is equivalent to molarity
Mole fraction is equivalent to MASS fraction
Normality of `H_(2)SO_(4)` solution is double than its molarity.

Answer :B::D
Discussion
16.

Whichof the followingis a temporaryeffect?

Answer»

electromericeffect
Inducticae effect
Hyperconjugation
all of these

Answer :A
Discussion
17.

Which of the following will give characteristic colour with FeCl_(3) ?

Answer»




`CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-OH`

Solution :Phenol give characteristic colour with `FeCl_(3)` solution. DUE to keto-enol tautomerism `beta`-ketoaldehyde (C) and `beta`-keto acid (D) will give characteristic colours with `FeCl_(3)` solution. In these TWO cases the enol form is sufficiently stable due to HYDROGEN bonding.
Discussion
18.

What do you understand by laminar flow of a liquid ?

Answer»

Solution :The type of flow in which there is a REGULAR gradient of VELOCITY in going from ONE layer to the next is called LAMINAR flow.
Discussion
19.

Which of the following on reductive ozonolysis will give only glyoxal ?

Answer»

ethene
Benzene
toluene
Ethyne

ANSWER :B::D
Discussion
20.

Which organic structure among the following is not an isomer of the compound CH_(3)-CO-CH_(2)CH_(2)CH_(2)CH_(3) ?

Answer»

`CH_(3)CH_(2) OCH = CHCH_(2)CH_(3)`
`CH_3CH=CHCH_(2)CH_2CHO`
` (CH_3)_2 CH - CO - CH_(2)CH_3`
`CH_(3)CH_(2)COCH_(2)CH_(2)CH_(3)`

ANSWER :B
Discussion
21.

Which of the following kinds of catalysis can be explained by the adsorption theory?

Answer»

HOMOGENEOUS catalysis
Acid-base catalysis
HETEROGENEOUS catalysis
Enzyme catalysis

Solution :Heterogeneous catalysis is EXPLAINED on the basis of adsorption THEORY.
Discussion
22.

Which of the following cannot decompose on heating to give CO_(2) in a dry test tube ?

Answer»

`Li_(2)CO_(3)`
`Na_(2)CO_(3)`
`KHCO_(3)`
`BeCO_(3)`

Solution :`Na_(2)CO_(3)` cannot be decomposed on HEATING.
Discussion
23.

The six carbon atoms of benzene are ……………hybridised

Answer»

SOLUTION :`SP^(2)`
Discussion
24.

Which is not a system of units for physical quantities ?

Answer»

PPM
FPS
SI
CGS

Answer :A
Discussion
25.

Which of the following solutions will have maximum amount of NaOH?

Answer»

4 L of `0.1` M NaOH solution
2 L 0f `5%w//v` NaOH solution
540 gm of 2m NaOH solution
300 gm of `20%w//w` NaOH solution

Answer :B
Discussion
26.

Which is not a property of H_(2)O_(2)

Answer»

Conc `H_2 O_2` solutionisacidicin NATURE
`H_2 O_2` isdiamagnetic `H_2 O_2 `is anoxidant forrocketfuel

Solution :`H_(2)O_(2)` has open book STRUCUTRE
Discussion
27.

Write the reasonance structure of CO_(3)^(2-) and HCO_(3)^(-).

Answer»

Solution :RESONANCE STRUCTURE of `CO_(3)^(2-)` ions :

Resonance structure of `HCO_(3)^(-)` ion :
Discussion
28.

What is the use of burette in laboratory ?

Answer»

To MEASURE VOLUME
To measure DENSITY
To measure WEIGHT
To measure viscosity

Answer :A
Discussion
29.

Which of the following species does not exist?

Answer»

`[BF_6]^(3-)`
`[AL F_6]^(3-)`
`[GaF_6]^(3-)`
`["In" F_6]^(3-)`

SOLUTION :`[BF_6](3-)`
Discussion
30.

Which bond of ethyl alcohol undergoes cleavage during its reaction with sodamide?

Answer»

`C-C`
`C-O`
`C-H`
`O-H`

SOLUTION :`R-O-H+NaNH_(2) RARR RONa+NH_(3)`
Discussion
31.

Which one of the following will have largest number of atoms ? (i) 1 g Au_((s)) (ii) 1g Na_((s)) (iii) 1 g Li_((s)) (iv) 1 g Cl_(2(g))

Answer»



Solution :(i) 1 gm `Au = (1)/(197) ` MOL Au MOLECULE
`=(1)/(197)xx6.022xx10^(23)` Au atom
(ii) 1 gm `Na=(1)/(23)` mol Na molecule
`=(1)/(23) xx 6.022 xx 10^(23)` Na atom
(iii) 1 gm `Li=(1)/(7)` mol Li molecule
`= 1/7 xx 6.022 xx 10^(23)` Li atom
(IV) 1 gm `Cl_(2) = (1)/(71) mol Cl_(2)` molecule
`=(1)/(71) xx 6.022 xx 10^(23)`
`=(2)/(71) xx 6.022 xx 10^(23) Cl_(2)` atom
Discussion
32.

Which one of the following is not a property of hydrophilic sols

Answer»

High concentrations of DISPERSED phase can be easily attained
Coagulation is reversible
Viscosity and surface tension are about the same as for water
The charge of the particle depends on the pH values of the MEDIUM, it may be positive, negative or EVEN zero

Solution :Viscosity and surface tension are not same for water in HYDROPHILIC sols.
Discussion
33.

What happens when a. Borax is heated strongly. b. Boric acid is added to water. c. Aluminium is treated with dil NaOH. d. BF_(3) is reacted with ammonia.

Answer»

Solution :a.When borax is strongly heated, a transparent glassy bead which CONSISTS of sodium metaborate and boric anhydride is formed.
`underset("Borax")(Na_(2)B_(4)O_(7).10H_(2)O)OVERSET(Delta)toNa_(2)B_(4)O_(7)+10H_(2)O`
`Na_(2)B_(4)O_(7)underset("RED Heat")overset(Delta)tounderset(ubrace({:(" Sodium,Boric"),("metaborate,anhydride"):})_("Transport glassy bead"))(2NaBO_(2)" + "B_(2)O_(3))`
b. Boric acid behaves as a Lewis acid and hence accepts `overset(ө)OH` ion form `H_(2)O` and realeses `H^o+` in the solution.
c. `2Al_((s))+underset(("dil"))(NaOH_((aq)))+6H_(2)Oto2Na^(o+)[Al(OH)_(4)]_((aq))^()+3H_(2(g)) or underset("Sodium meta-aluminate(III)")(Na_(2)AlO_(2).2H_(2)O)`
d.`F_(3)B+:NH_(3)to[F_(3)Blarr:NH_(3)]`
`BF_(3)` is a Lewis acid and accepts a pair of electron from `N` of `NH_(3)` molecule to form an adduct,
`[F_(3)Blarr:NH_(3)]`
Discussion
34.

To what volume must 50 mL of 3.50 M H_2SO_4 be diluted in order to make 2 M H_(2)SO_(4) ? [Hint: Use Rule 5]

Answer»


ANSWER :87.5 ML
Discussion
35.

Write the formal charges on atoms in CO_(3)^(2-) and HNO_(3).

Answer»

Solution :`CO_(3)^(2-)` (carbonate ion ) :
TOTAL valence electron= C (4) + three O (18) + (-2) charge (2) = 24 Formal charge
= `("valence" e^(-)) - ("lone pair" e^(-)) -` (no. of bond)

F = x- nb-b
F = (x - nb - b )
`therefore ` Formal charge of C = 4 - 4 = 0
(`because` Total relation with C)
Formal charge of
O (1) = 6 - 6 -1 = - 1
Formal charge of
O (2) = 6 - 4 - 4 = 0
Formal charge of
O (3)=6- 6 -1 = -1
Valence`e^(-) ` of O = 6
Two bonding andsix non boding `e^(-) ` with single bond contain O.
Four non boding and two boding `e^(e)` on double bond containing O.
So, structure :
Formal charge on atoms of `HNO_(3)` :
F =(x - nb - b)
O, N and H the valence `e^(-)` 6,5 and 1 are respectively.
Formal charge of O (2) = 6 - 6 - 1 = -1
Formal charge of O (1) = 6 - 4 - 2 = 0
Formal charge of O (3) = 6 - 4 - 2 = 0
Formal charge of N = 5 - 0 - 4 = + 1
Formal charge of H = 1 - O - 1 = O
So, structure of `HNO_(3)` with formal charge :
Discussion
36.

Write ionic equilibrium and equation of solubility product of concentrated solution of Barium sulphate (BaSO_4).

Answer»

SOLUTION :Ionic equilibrium : `BaSO_(4(s)) hArr Ba_((AQ))^(2+) + SO_(4(aq))^(2-)`
`K_(sp)=([Ba^(2+)][SO_4^(2-)])/([BaSO_4])`
For SOLID `BaSO_4 , [BaSO_4]` = constant
`therefore K_(sp)=[Ba^(2+)][SO_4^(2-)]`
Discussion
37.

Which is maximum stable ?

Answer»

But `1`- ene
cis-but-`2`-ene
trans-but-`2`-ene
All have equal

Answer :A::B::C
Discussion
38.

What do you understand by the term mole ?

Answer»

Solution :The MOLE is defined as the amound of a substance which CONTAINS `6.02 xx 10^(23)` particles such as atoms, moleculs or ions. It is represendted by the SYMBOL ..n...
Discussion
39.

Which of the following halogen exchange reaction will occur in acetone?

Answer»

`R-I+NaCl`
`R-F+KCl`
`R-Cl+NaI`
`R-F+AgBr`

SOLUTION :`R-Cl+NaI`
Discussion
40.

Write the state of hybridization of all the atoms in CH_(2)=C=CH_(2) and draw its orbital structure. Do the two atoms on C_(1) lie in the same plane in which hydrogens on C_(3) lie. Explain.

Answer»

Solution :The gross structure of allene `(C_(3)H_(4))` is `OVERSET(1)(C)H_(2)=overset(2)(C)=overset(3)(C)H_(2)`
The carbon atoms 1 and 3 are `sp^(2)`-hybridized SINCE each one of them is joined by a double bond. In CONTRAST, carbon atom 2 is sp-hybridized since it has two double bonds. Thus, the two `pi`-bonds in allene like in acetylene are perpendicular to each other as shown below.

whereas `H_(c)` and `H_(d)` lie in the plane of the paper while `H_(a)` and `H_(B)` lie in a plane perpendicular to the plane of the paper. Thus, the molecule as a WHOLE is non-planar.
Discussion
41.

Which of the following is more soluble in enther?

Answer»

`BeCl_(2)`
`CaCl_(2)`
`SrCl_(2)`
`BaCl_(2)`

ANSWER :1
Discussion
42.

What will be the conjugate bases for the following Bronsted acids : HF, H_2SO_4 and HCO_3?

Answer»

Solution :Conjugate base = ACID - `H^+`
The conjugate bases should have one proton and +1 charge LESS than acid.
Conjugate base ofHF=`(HF-H^+)=F^-`
Conjugate base of `H_2SO_4 = (H_2SO_4-H^+) =HSO_4^-`
Conjugate base of `HCO_3^(-) = (HCO_3^(-)- H)=CO_3^(2-)`
Discussion
43.

Which of the following contains most acidic hydrogen

Answer»




ANSWER :B
Discussion
44.

Which of the following exist as polymer in solid state?

Answer»

`NaHCO_(3)`
`BeCl_(2)`
`KHCO_(3)`
`H_(3)BO_(3)`

Answer :A::B::D
Discussion
45.

When phenol is made to react with PCl_(5) in presence of pyridine , the resulting product contains.

Answer»

`C_(6)H_(5)Cl` only
`(C_(6)H_(5)O)_(3)P=O` only
Both A & B
None of the above

Answer :C
Discussion
46.

Which is the correct lewis structure of BF_(3)?

Answer»

`:UNDERSET(* *)OVERSET(* *)F - underset(* *)underset( :F: )underset(|)B-underset(* *)overset(* *)F:`
`:overset(* *)F = underset(* *)underset( :F: )underset(|)B-underset(* *)overset(* *)F:`
`:underset(* *)overset(* *)F = underset( :F: )underset(|)B-underset(* *)overset(* *)F:`
`:underset(* *)overset(* *)F = underset(* *)underset( :F: )underset(|)B-underset(* *)overset(* *)F:`

SOLUTION :`:underset(* *)overset(* *)F - underset(* *)underset( :F: )underset(|)B-underset(* *)overset(* *)F:`
Discussion
47.

What are boranes ? Give chemical equation for the preparation of diborane.

Answer»

SOLUTION :Boranes are the binary compounds of boron and hydrogen like an Alkanes. These are covalent hydrides of formula `B_2H_6` called diborane.
PREPARATION of diborane : It is prepared by treating boron trifluoride with `LiAlH_4` in diethyl ETHER.
`4BF_3 + 3LiAlH_4 to 2B_2H_6 + 3LiF + 3AlF_3`
`B_2H_6` is produced on an industrial scale by the REACTION of `BF_3` with NaH (Sodium HYDRIDE)
`2BF_3 + 6NaH overset"450 K"to B_2H_6 + 6NaF`
Discussion
48.

Which property is lower for deuterium than hydrogen?

Answer»

LATENT HEAT of vapourisation
Latent heat of FUSION
Reactivity
Atomic weight

Answer :C
Discussion
49.

Which of the following hydrocabon has least C-C bond length?

Answer»

`C_2 H_6`
`C_2H_4`
`C_6 H_6`
`C_2 H_2`

ANSWER :D
Discussion
50.

What is oxidation number of N in HNO_(4) ?

Answer»

SOLUTION :H + 2 (Peroxide O) + N + 2 (OXYGEN) = 0
`therefore+1+2(-1)+N+2(-2)=0""H-overset(-1)(O)-overset(-1)(O)-UNDERSET(O)underset(||)(N)toO`
`thereforeN=+5`
Discussion