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_(2)O_(2) is added to blood, rapid evolution of gas occurs. Explain.

Answer»

SOLUTION :The enzyme present in the blood catalyst the OXIDATION of `H_(2)O_(2)` and hence rapid evolution of `O_(2)` takes place.
`2H_(2)O_(2) underset("in blood")OVERSET("Enzyme present")to 2H_(2)O + O_(2) uarr`
Discussion
2.

The temperature of an ideal gas is increased from 120K to 480K. If at 120K the root-mean-square velocity of the gas molecules is v, at 480K it becomes:

Answer»

4v
2v
`(V)/(2)`
`(v)/(4)`

ANSWER :B
Discussion
3.

The total number of tetrahedral voids in the face centred unit cell is……

Answer»

6
8
10
12

Solution :No. of atoms per unit cell in FACE centred unit cell =4 ,No. of tetrahedral VOIDS = ` 2XX 4 =8`
Discussion
4.

What will be normality of the solution obtained by adding 200 mL of pure water to 100 mL of 0.2 N HCl solution ?

Answer»


Solution :APPLYING normality equation :
`OVERSET(("conc."))(N_(1)V_(1))-=overset(("dilute"))(N_(2)V_(2))`
`0.2xx100=N_(2)xx300orN_(2)=(0.2xx100)/(300)=0.067N`.
Discussion
5.

Which is the correct statement?

Answer»

Hydrogen has the same IE as ALKALI METALS
`H^(-)` ion has the same electronegativity as halogens
`H^(-)` ion has OXIDATION number of -1
`H^(-)` ion is not liberated at anode.

Solution :(c ) `H^(-)` ion has O.N=-1
Discussion
6.

Which one of the following satements is//are correct? 1) H_(2)O_(2) soluytions are stored in plastic or wax coated glass vessels since contact with rough surfaces acceleartes its decomposition 2) Urea, sodium stannate, acetanilide, sodium pyrophosphate etc., act as stabilizers(inhibitors)(negative catalyst) for the decomposition of H_(2)O_(2) 3) Silica, MnO_(2),iron, manganese, alumina act as accelerters(positive catalysts) for teh decomposition of H_(2)O_(2) H_(2)O_(2) is a very powerful oxidising agent and a poor reducing agent

Answer»

All are correct
1,2,4 correct
1,3 correct
2,4 correct

Answer :A
Discussion
7.

Which of the following compound on acidic hydrolysis yields 1, 2-ethanediol ?

Answer»

Epoxyethane
Ethane
Ethylenedibromide
Both (A) and (B)

SOLUTION :
Discussion
8.

Which of the following is least ionic?

Answer»

`CaF_(2)`
`CaBr_(2)`
`CaCI_(2)`
`CaI_(2)`

ANSWER :D
Discussion
9.

When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to

Answer»

SOLUTION :DEEP BLUE, ammoniated ELECTRONS
Discussion
10.

Why axis bonds of PCl_(5)are longer than equatorial bonds ?

Answer»

Solution : This is DUE to greater REPULSION on the AXIAL bond pairy by the equatorial bond parisof ELECTRONS .
Discussion
11.

Which contains the greatest number of moles of oxygen atoms? (i) 1 mol of ethanol (ii) 1 mol of formic acid (iii) 1 mol of H_(2)O

Answer»

Solution :(i) 1 mol of ETHANOL `C_(2)H_(5)OH` (ethanol) - Molar mass = 24 + 6 + 16 = 46
46 g of ethanol contains `1xx 6.023 xx 10^(23)`
number of oxygen atoms.
(ii) 1 mol of formic acid
HCOOH (formic acid) - Molar mass = 2 + 12 +32 = 46
46 g of HCOOH contains `2xx 6.023 xx 10^(23)` number of oxygen atoms.
(iii) 1 mol of `H_(2)O`
`H_(2)O` (WATER) - Molar mass = 2+16=18
18 g of water contains `1 xx 6.023 x 10^(23)` number of oxygen atoms.
`:.` 1 mole of formic acid contains the greatest number of oxygen atoms.
Discussion
12.

Which of the following is an unsaturated compound ?

Answer»

`C_(6)H_(14)`
`C_(4)H_(8)`
`C_(3)H_(7)OH`
`CH_(3)OH`

Solution :`C_(4)H_(8)` is an UNSATURATED COMPOUND
Discussion
13.

Which of the following compounds is most basic ?

Answer»




ANSWER :C
Discussion
14.

The rms velocity of an ideal gas at 300 K is 12240 ems^(-1), what is the most probable velocity at that temperature?

Answer»

`10000`
`11280`
1000
12240

Answer :A
Discussion
15.

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?

Answer»

`Cl ltF LT O lt S` 
`O lt S lt F lt Cl`
` F lt S lt O lt C`
`S lt O ltCl lt F`

ANSWER :B
Discussion
16.

Which is a good fuelCH_(4) orC_(2)H_(6) ? The standard enthalpy of formation of CH_(4), C_(2)H_(6), CO_(2) and H_(2)O are - 74.8, - 84.6 , - 393 . 5 and -286kJ mol^(-1) respectively.

Answer»


SOLUTION :Calculate `Delta H `for
`CH_(4) + 2O_(2)RARR CO_(2)+ 2H_(2)O`
and `C_(2)H_(6) + (7)/(2) O_(2) rarr 2CO_(2)+ 3H_(2)O`
Then calculate `Delta H ` per gram
Discussion
17.

What is the SI unit of pressure ? Define it.

Answer»

SOLUTION :PA or `NM^(-2)`
Discussion
18.

What is true order of average speed mu_(av), maximum possible speed u_(mp) and root mean square speed u_(rms) for any gas ?

Answer»

`u_(MP)gt u_(av)gt u_(RMS)`
`u_(rms)gt u_(av)gt u_(mp)`
`u_(rms)gt u_(mp)gt u_(av)`
`u_(mp)gt u_(rms)gt u_(av)`

Answer :B
Discussion
19.

What are the raw materials used in solvay's process?

Answer»

`NACL,NH_(3),CaCO_(3)`
`NAOH,CO_(2)`
`NaCl,CaCO_(3),C,H_(2)SO_(4)`
`NH_(3),H_(2)O,H_(2)SO_(4)`

Answer :A
Discussion
20.

Value of universal gas constant (R ) is same for all gases. What is its physical significance ?

Answer»

Solution :Unit of R depends upon those units in which p, V and T are measured as, `R = (pV)/(nT)`. If pressure is measured in Pascal, per mole volume is measured in `m^(3)` and TEMPERATURE is measured in KELVIN then. Units of .R. are `Pam^(3)K^(-1)mol^(-1)` or `J mol^(-1) K^(-1)`. Since, Joule defines the unit of work done so .R. is work done by the GAS per mole per kelvin.
Discussion
21.

What are spontaneous process ?

Answer»

SOLUTION :A reaction that occurs under the given set of conditions without any EXTERNAL DRIVING FORCE is called a spontaneous reaction.
Spontaneous (irreversible)
`DeltaHlt0`
`DeltaSgt0`
`DeltGlt0`
Discussion
22.

The smog is essentially caused by presence of

Answer»

`O_2 and O_3`
`O_3 and N_2`
OXIDES of SULPHUR and NITROGEN
`O_2 and N_2`

ANSWER :C
Discussion
23.

Which series of lines of the hydrogen spectrum lie in the visible region ?

Answer»

SOLUTION :BALMER SERIES
Discussion
24.

Which of the following groups can neither donate a pair of electrons in resonance

Answer»

`-NO_(2)`
`-NO`
`-CH=CH_(2)`
`-CHO`

ANSWER :B::C
Discussion
25.

What causes temporary and permanent hardness of water?

Answer»

SOLUTION :For ANSWER, CONSULT SECTION 9.10
Discussion
26.

Which one of the following statement is incorrect

Answer»

DIHYDROGEN is the most ABUNDANT ELEMENT in the universe.
Dihydrogen is the principal element in the solar ATMOSPHERE.
`H_(2)` is much less abundant in the earth crust.
`H_(2)` does not OCCUR in plant and animal tissues

Answer :D
Discussion
27.

What do you understand by bond pairs and lone pairs of electrons? Illustrate with example.

Answer»

Solution :The shared pair of ELECTRONS which is RESPONSIBLE for the formation of bond is CALLED bond pairs of electrons.The pair of valence electrons not involved in BONDING are known as LONE pair of electrons.
Discussion
28.

Which of the following orbital is not possible

Answer»

3 F
4f
5f
6f

ANSWER :A
Discussion
29.

Which scientist are the VSEPR theory ?

Answer»

SOLUTION :Sidgwick and POWELL GAVE this theory in 1940.
This theory was improved by Nyholm and Gillespie.
Discussion
30.

What is the value of H-C-H bond angle in ethylene?

Answer»

SOLUTION :`120^@`
Discussion
31.

Which of thefollowing combination of aldehydes gives orange yellow ppt with 2,4- DNP

Answer»

CARBONYL COMPOUNDS
Carboxylic acids
only aldehydes
only ketones

Solution :2,4 - DNP TEST is the IDENTIFICATION test for carbonyl compounds
Discussion
32.

When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s) ?

Answer»

`H^(+)` IONS
`Mg^(2+)` ions
`CA^(2+)` ions
`SO_(4)^(2-)` ions

Solution :Zeolite is USED to remove hardness of WATER. Zeolite is sodium aluminosilicate. It has a property to exchange `Ca^(2+)`and `Mg_(2+)`. ions from hard water by `Na^(+)`ION of zeolite.
Discussion
33.

Which oxide of Nitrogen is in solid form ?

Answer»

NO
`NO_2`
`N_2O_5`
`N_2O_3`

ANSWER :C
Discussion
34.

Liquid drops attain spherical shape.Which property of liquids responsible for this?

Answer»

SOLUTION :LIQUID tends to minimise their surface area. Spherical surface has small surface area. So liquid DROPS ASSUME spherical shape.
Discussion
35.

Which of the following is/are not known ? PCI_(3),AsCI_(3),SbCI_(3),NCI_(5),BiCI_(5).

Answer»

Solution :(i) `NCI_(5)` (DUE to absence of d-orbitals) (ii) `BiCl_(5)(BI^(+5)` being an oxidising agent oxidises `Cl^(-)` ion to `Cl_(2)` and `Cl^(-)` ion being a reducing agent REDUCES `Bi^(+5)" to "Bi^(3+)`.
Discussion
36.

What is hybridization ?

Answer»

Solution :It is a process where TWO or more ATOMIC orbital of comparable energy of valency SHELL of an atom MIX to form the same number of new orbital of same energy.
Discussion
37.

Which of the following alkaline earth metal is highly inert...

Answer»

LI
FR
BA
RA

ANSWER :D
Discussion
38.

The shape of CIO_(3)^(-) is

Answer»

LINEAR
ANGULAR
TETRAHEDRAL
PYRAMIDAL

ANSWER :D
Discussion
39.

What is shape of H_2Omolecule ?

Answer»

Linear
Angular
Triangular
planar

ANSWER :B
Discussion
40.

Which of the following properties decreases from hydrogen to deuterium to tritium?

Answer»

Relative atomic mass `(g MOL^(-1))`
Density `(g L^(-1))`
MELTING POINT `(K)`
Active ABUNDANCE (%)

Answer :D
Discussion
41.

The total number of anionic species which give coloured gas with conc. H_(2)SO_(4)are: CO_(3)^(2-),HCO_(3)^(-),SO_(3)^(2-),NO_(3)^(-),S_(2)O_(3)^(2-),CH_(3)COO^(-),SO_(4)^(2-).

Answer»


SOLUTION :`NO_(3)^(-),NO_(2)^(-)`
Discussion
42.

What is sublimation ? Give its uses and examples

Answer»

Solution :Definition: On heating some solid substances change from solid to VAPOUR state without passing through LIQUID state. The purification technique based on the above principle is known as sublimation. Uses: It is used to separate sublimable compounds from NON sublimable impurities. Examples: Sublimation technique is used for purification of MIXTURE of calcium sulphate and camphor. Because camphor undergoes sublimation and separated and calcium sulphate settle at bottom without sublimation.
Discussion
43.

Which of the following IUPAC names (s) is/are correct?

Answer»

2,2,3-Trimethyl HEXANE
3-[1,2-Dimethy Propyl]-5-Propyl Decane
3,4 Dimethyl-7-(2 methyl propyl) UNDECANE
3-Ethyl-2,6-Dimethyl heptane

ANSWER :A::C::D
Discussion
44.

The temperature of the gas is raised from 27^(@)C to 927^(@)C, the root mean square velocity is

Answer»


Solution :`U propsqrt(T):.(u_(1))/(u_(2))=sqrt((T_(1))/(T_(2)))=sqrt((300K)/(1200K))=sqrt((1)/(4))=(1)/(2)`
`:. u_(2)=2u_(1)`
Discussion
45.

Which of the following are used as catalyst in Friedel-Crafts reactions ?

Answer»

`AlCl_(3)`
`SiCl_(4)`
`BF_(3)` is the strongest Lewisacid among the otherboronhalides
`SnCl_(4)`

Solution :Becauseof big SIZE of Cl atomsand weakinteraction between lone PAIRS OFCL and Si, si cannotexplandits covalencybeyond 4 andhence`SiCl_(4)`cannot have as a catalyst.
Discussion
46.

The rms velocity of CO gas molecules at 27^(@)C is approximately 1000 m//s . For N_(2) molecules at 600 K , the rms velocity is approximately "___________"'

Answer»

`2000 m//s`
` 1414 m//s`
`1000m//s`
`1500 m//s`

ANSWER :B
Discussion
47.

Which one of the following has highest bond order? N_(2), N_(2)^(+) or N_(2)^(-)?

Answer»

Solution :`N_(2)` (14 electrons)
Bond ORDER = 3, B.O. = `(N_(b)-N_(a))/(2)=(10-4)/(2)=3`
`N_(2)^(+)` (13 electrons)
Bond order = 2.5, B.O. `=(N_(b)-N_(a))/(2)=(9 - 4)/(2)=2.5`
`N_(2)^(-)` (15 electrons)
Bond order `= 2.5, B.O. = (N_(b)-N_(a))/(2)=(10 -5)/(2)=2.5`
So `N_(2)` has the HIGHEST bond order.
Discussion
48.

What will be the enthalpy change of conversion of graphite into diamon

Answer»


Solution :`{:(," "C_("GRAPHITE"),rarr," "C_("damond")),(DeltaH_("COMBUSTION"),-"391.25 kJ,",,-"393.12 kJ):}`
`DELTAH=-393.12-(-391.25)=-1.87kJ`
Discussion
49.

Vapour density of N_(2)O_(4) of x 60^(@) C is found to be 30.6 The degree of dissociation of N_(2) O_(4) is :

Answer»

0.1
0.2
0.4
0.5

Solution :`N_(2)O_(4(g)) harr 2NO_(2(g))`
`ALPHA=(D-d)/(d(n-1))=(46-30.6)/(30.6)=0.5 IMPLIES 1-alpha=50%`
Discussion
50.

The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. Which of the following statements(s) is (are) correct?

Answer»

<P>`T_(1) = T_(2)`
`T_(3) gt T_(1)`
`W_("isothermal") gt W_("adiabatic")`
`Delta U_("isothermal") gt Delta U_("adiabatic")`

Solution :`V_(i) gt V_(a)` (from graph)
`T_(i) gt T_(a) ( :. T_(i) = T_(1) "&" T_(a) = T_(3) LT T_(1))`
`P_(i) gt P_(a)` (from graph), `W_(i) gt W_(a)` (from graph)
`Delta U_(i) gt Delta U_(a) ( :. Delta U_(i) = 0 "&" Delta U_(a) lt 0)`
Discussion