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.

According to Le Chateier principle, when an equilibrium is subjected to any external change, the equilibrium/reaction shifts to comensate the effect of the change. This principle helps in shifting the reaction towards appropriate diections so as to increase % yield of any reaction. Which of the following changes cannot cause an incresase in extent of dissociation of CH_(3)COOH in its aqueous solution as per the reaction? CH_(3)COOH(aq)+H_(2)O(l)hArrCH_(3)COO^(-)(aq)+H^(+)(aq)

Answer»

Addition of WATER into the solution
Addition of NAOH into the solution
Addition of HCI into the solution
Remove of `CH_(3)COO^(-)` from solution.

Answer :C
Discussion
2.

According to Law of Mass Action, the rate at which a substance reacts is proportional to its ………..

Answer»


ANSWER :ACTIVE MASS or MOLAR CONCENTRATION
Discussion
3.

According to law of combining weights if Na, O and Cl formNaCl and Cl_(2)O, then which one will be the third compound ?

Answer»

`NaO_(2)`
`Na_(2)O_(2)`
`Na_(2)O`
All of the above

Answer :A::B::C
Discussion
4.

According to kinetic theory. What are the two assumptions made with regard to idean gas ?

Answer»

Solution :(i) the individual gas MOLECULES occupy NEGLIGIBLE volume when compared to the total volume of the gas.
(ii) There is no ATTRACTIVE force between the gas molecules.
Discussion
5.

According to kinetic theory of gases in an ideal gas between two successive collisions a gas molecule travels:

Answer»

in a STRAIGHT line PATH
with an accelerated velocity
in a circular path
in a way path

Answer :a
Discussion
6.

According to kinetic theory of gases, for a diatomic molecule wich is (are) not correct?

Answer»

The pressure EXERTED by the gas is directly proportional to the mean speed of the molecule
The pressure exerted by the gas is directly proportional to the root mean SQUARE speed of the molecule.
The root mean square speed of the molecule is inversely proportional to the temperature.
The mean transitional kinetic ENERGY of the molecule is proportional to the ABSOLUTE temperature.

Answer :abc
Discussion
7.

According to kinetic theory of gases, for a diatomic molecule, which is not correct

Answer»

the pressure exerted by the gas is proportional to the mean speed of the molecule 
the pressure exerted by the gas is proportional to the mean SQUARE speed of the molecule 
the ROOT mean square speed of the molecule is inversly proportional to the square root of temperature 
the mean transational KINETIC energy of the molecule is proportional to the absolute temperature 

SOLUTION :`PV = 1/3 MC^2`
C = rms velocity , `C = sqrt((3RT)/(M)) , KE alpha T`.
Discussion
8.

According to kinetic molecular theory the Kinetic energy value of one mole of gas is

Answer»

1.5RT CAL 
1.5RT ERGS 
1.5RT 
1.5RT JOULES 

ANSWER :C
Discussion
9.

According to kinetic theory of gases

Answer»

COLLISIONS are always ELASTIC
HEAVIER molecules transfer more momentun to the wall of the container
only a SMALL number of molecules move in straight lines with constant velocities
between collisions, the molecules move in straight lines with constant velocities

Solution :All the given statements are CORRECT.
Discussion
10.

According to IUPAC nomenclature, which are the prefixis of alcohol, aldehyde and ketones are respectively?

Answer»

Oxi, OXO and keto
Alcohol, FORMYL and keto
Hydroxy, oxo and oxo
Hydroxy, ol and one

Answer :C
Discussion
11.

According to IUPAC, following name is correct for structure of Q-20 why? 5-(2', 2-dimethyl butyl)-3-ethyldecane

Answer»

Solution :It is not CORRECT. As the in sub branch if the NEAR by SUBSTITUENTS are more then it can not be taken as subranch
Discussion
12.

According to IUPAC conventions, which one of the following is/are correct?

Answer»

The heat absorbed by a system is TAKEN as positive
If a system is acompained by decrease in energy, `Delta E` is negative
The work DONE by the system is taken as negative
All the above three statements are correct

Solution :`q gt 0` if heat is absorbed
`Delta E lt 0 rArr` decrease in energy
`W_(by) rArr W lt 0`
Discussion
13.

According to international standards of drinking water, the tolerable limit for fluoride ions in water is ______

Answer»


ANSWER :1 PPM
Discussion
14.

According to Huckel rule, the number of i electrons in anthracene is

Answer»

12
14
10
20

Solution :`(4 xx 3 + 2) = 14 PI` ELECTRONS.
Discussion
15.

According to Huckel, aromatic compounds should contain

Answer»

`4pi` ELECTRONS
no `pi` electrons
` 4pi +2` electrons
`(4N +2) pi` electrons

Solution :`(4n +2 ) pi` electrons, Huckel.s RULE
Discussion
16.

According to Heisenberg's uncertainty principle, the product of uncertainty in position and uncertainty in momenutm should be ge......

Answer»

SOLUTION :`h//4 PI`
Discussion
17.

According to hard andsoft acid base principle, hard acid

Answer»

has LOW charge density
shows preference for soft bases
shows preference for donor atoms of low electronegativitiy
is not polarizable

Solution :HARD acids are SMALL metal IONS which are not polarizable
Discussion
18.

According to Graham's law at a given temperature, the ratio of the rates of diffusion r_(A)//r_(B) of gases A and B is given by

Answer»

<P>`(P_(A)//P_(B))(M_(A)//M_(B))^(1//2)`
`(M_(A)//M_(B))(P_(A)//P_(B))^(1//2)`
`(P_(A)//P_(B))(M_(B)//M_(A))^(1//2)`
`(M_(A)//M_(B))(P_(B)//P_(A))^(1//2)`

ANSWER :A
Discussion
19.

According to Graham's law, at a given temperature the ratio of diffusion r_A/r_B of gases A and B is given by (where P and M are pressures and molecular weights of gases A and B respectively)

Answer»

`(P_A/P_B)(M_A/M_B)^(1//2)`
`(M_A/M_B)(P_A/P_B)^(1//2)`
`(P_A/P_B)(M_B/M_A)^(1//2)`
`(M_A/M_B)(P_B/P_A)^(1//2)`

SOLUTION :`(P_A/P_B)(M_B/M_A)^(1//2)`
Discussion
20.

According to Graham's law at a given temp, the ratio of diffusion r_A//r_B, of gases A and B is given by

Answer»

`((P_A)/(P_B)) ((M_A)/(M_B))^(1/2)`
`((M_A)/(M_B))((P_A)/(P_B)) ^(1//2)`
`((P_A)/(P_B))((M_B)/(M_A))^(1//2)`
`((M_A)/(M_B)) ((P_B )/(P_A))^(1/2)`

ANSWER :C
Discussion
21.

According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . The highest lattice energy corresponds to

Answer»

MgO
CaO
SRO
BaO

SOLUTION :Due to SMALL SIZE , MgO has the highest LATTICE energy.
Discussion
22.

According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . Based on lattice energy and other consideration , which one of the following alkali metal chlorides is expected to have the highest melting point ?

Answer»

LiCl
NaCl
KCl
RbCl .

SOLUTION :LiCl being COVALENT has the lowest MELTING point . Among the remaining chlorides , because of SMALLER size of Na , NaCl has the highest lattice energy and hence has the highest melting point .
Discussion
23.

According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . Which of the following has the lowest melting point ?

Answer»

LICL
NaCl
KCL
RbCl .

SOLUTION :Being PREDOMINANTLY COVALENT , LiCl has the lowest m.p.
Discussion
24.

According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . The correct order of increasing ionic character is

Answer»

`BeCl_(2) lt MgCl_(2) lt CaCl_(2) lt BaCl_(2)`
`BeCl_(2) lt MgCl_(2) lt BaCl_(2) lt CaCl_(2)`
`BeCl_(2)lt BaCl_(2) lt MgCl_(2) lt CaCl_(2)`
`BaCl_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)`

Solution :As the size of the CATION increases , electronegativity decreases but the electronegativity DIFFERENCE increases and hence IONIC CHARACTER increases accordingly , i.e., option (a) is correct .
Discussion
25.

According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . The correct order of increasing covalent character is

Answer»

LiCl , NACL, `BeCl_(2)`
`BeCl_(2) , NaCl , LiCl`
`NaCl , LiCl , BeCl_(2)`
`BeCl_(2) , LiCl , NaCl`

Solution :As the size of the cation increases the covalent CHARACTER DECREASES . Thus option (c) is correct , i.e., `NaCl LT LiCl lt BeCl_2`.
Discussion
26.

According to Ellinigliam diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at the lowest tempertaure

Answer»

`Al_(2)O_3`
`Cu_(2)O`
MgO
ZnO

Solution :N//A
Discussion
27.

Kinetic energy of photoelectrons is independent of the of incident radiation.

Answer»




SOLUTION :
Discussion
28.

According to de Broglie

Answer»

a moving electron POSSESS wave CHARACTER
light POSSES PARTICLE character
a moving proton posess wave character
all moving particles possess wave character

Solution :ACCORDING to de-Broglie
`*` a moving electron possess wave character
`*` a moving proton posess wave character.
`*` all moving particles possess wave charactr
Discussion
29.

According to De-Brogli’s principal, what is the relation between momentum and w avelength of m ovable particals

Answer»

INVERSE PROPORTION
UNDERROOT proportion
same proporotion
NONE of these

ANSWER :A
Discussion
30.

According to de Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties. However, a cricket ball of mass 100 g does not move like a wave when it is thrown by a bowler at a speed of 100 km/h.Calculate the w avelength of the ball and explain why it does not show wave nature.

Answer»

SOLUTION :Here m =100 g =0.1 kg
`h=6.626 xx10^(-34)` JS
According to DE BROGLIE equationwavelength`lambda=(h)/(mv)`
`=238.5 xx10^(-34) m^(-1)`
so the wavelength is very small the wave naturecannot be detected
Discussion
31.

According to de Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties. However, a cricket ball of mass 100g does not move like a wave when it is thrown by a bowler at a speed of 100km/h. Calculate the wavelength of the ball and explain why it does not show wave nature.

Answer»

SOLUTION :`m = 100g = 0.1 kg, V = 100 km//hr = (100 XX 1000m)/(60 xx 60s) = (1000)/(36) ms^(-1)`
`LAMDA = (h)/(mv) = (6.626 xx 10^(-34) kg m^(2) s^(-1))/((0.1 kg) (1000//36 ms^(-1))) = 238.5 xx 10^(-36) m`
As the wavelength is very small, the WAVE nature cannot be detected
Discussion
32.

According to Charle's law, for a gas of constant mass

Answer»

`((dV)/(dt))_P = K`
`((dV)/(dT))_(P) = -K`
`((dV)/(dT))_P = - K/T`
`V prop T` (at CONST P, const mass)

Solution :`PV = nRT, V = (NR)/P cdot T IMPLIES V alpha T, ((dV)/(dT))_(p) =K`
Discussion
33.

According to Bronsted-Lowry concept, a substance which can act both as acid and base is called............... .

Answer»


ANSWER :AMPHOTERIC or AMPHIPROTIC
Discussion
34.

According to Boyle's law

Answer»

`(dP//dV)_(T) = K//V^(2)`
`(dP//dV)_(T) = - K//V`
`(dV//dP)_(T) = - K//P^(2)`
`(dV//dP)_(T) = - K//P`

Solution :According to BOYLE's law at constant temperature
`V prop 1/P""`or `""V=K/P`
`:. (dV//dP)_(T)= -K//P^(2)`
`P=K/V`
Discussion
35.

According to Bohr.s theory, when ever the electron drops from a higher energy level to a lower energy level, the frequency of radiation emitted is related to the energy change as

Answer»

`lambda = (h)/(m V)`
`m v r = (nh)/(2PI)`
`UPSILON = (Delta E)/(h)`
`upsilon = (h)/(Delta E)`

ANSWER :C
Discussion
36.

According to Bohr theory, the angular momentum of an electron in 5th orbit is

Answer»

`10h//pi`
`2.5 h//pi`
`25 h//pi`
`1.0 h//pi`

SOLUTION :`(nh//2pi = 5h//2pi = 2.5 h//2pi)`
Discussion
37.

According to Bohr.s theory, the angular momentum of electron in 5th orbit is

Answer»

`2.5 (H)/(pi)`
`25 (h)/(pi)`
`1.0 (h)/(pi)`
`10 (h)/(pi)`

Solution :`mvr = (nh)/(2PI) = (5H)/(2pi) = (2.5 h)/(pi)`
Discussion
38.

According to Bohr.s theory, E_n = total energy, K_n = kinetic energy, V_n = potential energy, r_n =radius of n^(th) orbit. Match the following.

Answer»


Solution :According to Bohr.s THEORY , kinetic energy
`(K_n) = (Ze^2)/(2r)`
Potential energy`(V_n) = - (Ze^2)/(r)`,
Total energy `(E_n) =-(Ze^2)/(2r)`
A) `(V_n)/(K_n) = (-Ze^2//r)/(Ze//2r) = - 2`
B) `r_n prop n^2 and E_n prop 1/(n^2) ` , i.e. , `E_n prop 1/(r_n)`
C) Angular momentum`=sqrt(l(l+1)) (h)/(2pi)`
The lowest orbital is 1s for which l=0
Hence angular momentum =0
D)` r_n prop 1/Z ` or `1/(r_n)prop Z therefore y = 1`
Discussion
39.

According to Bohr's theory, the angular momentum for an electron of 5^(th) orbit is

Answer»

`2.5h//pi`
`5h//pi`
`25h//pi`
`6h//2pi`

ANSWER :A
Discussion
40.

According to Bohr.s theory, E_(n) = total energy, K_(n)= kinetic energy , V_(n) = potential energy, r_(n) = radius of n^(th) orbit. Match the following.

Answer»


ANSWER :A-R; B-Q; C-P; D-S
Discussion
41.

Accordingto Bohr'stheoryof hydrogenatom which of thefollowingis quantisedfor andelectron ?

Answer»

ANGULARMOMENTUM
Angularacceleration
ACCELARATION
VELOCITY

ANSWER :A
Discussion
42.

According to Bohr's model of an atom, the electrons revolve round the nucleus in

Answer»

ORBITS 
sub-orbits 
ORBITALS 
ELECTRON CLOUD 

ANSWER :D
Discussion
43.

According to Bohr's principle , the relation between principal quantum number (n) and radius of orbit is

Answer»

`r prop n`
`r prop n^2`
`r prop 1/n`
`r prop 1/n^2`

Solution :Bohr SUGGESTED a formulae to calculate the radius and ENERGY of each orbit and gave the FOLLOWING formulae
`r_n=(n^2h^2)/(4pi^2 kme^4Z)`
where EXCEPT `n^2`, all other UNIT are constant so `r_n prop n^2`
Discussion
44.

According to Bohr.s theory

Answer»

When the atom gets the required energy from outside, electrons jumps from lower ORBITS to higher orbits and remain there
When the atom gets the required energy from outside, electrons jumps from lower orbits to higher orbits and remain there for very SHORT intervals of TIME and return BACK to the lower orbit, radiating energy
Angular momentum of the electron is proportional to its quantum number
Angular momentum of the electron is independent to its quantum number

Answer :B::C
Discussion
45.

According to Bohr model of atom

Answer»

The radius of `n^(TH)` ORBIT a `n^(2)`
The TOTAL energy of electron in `n^(th)` orbit `alpha(1)/(n)`
The ANGULAR momentum electron is integral multiples of `h//2pi`
The magnitude of potential energy of an electron is an orbit greater than kinetic energy

Answer :A::C::D
Discussion
46.

(i) The energyassociatedwith thefirstorbitin the hydrogenatomis -2.18 xx 10^(18)J atom^(-1)whatis the energyassociatedwith the fifthorbit ? (ii) Calculatetheradiusof Bohr.fifthorbitfor hydrogenatom

Answer»

SOLUTION :`9.67 XX 10^(19) Jlambda= 2.055 xx 10^(7) m`
Discussion
47.

According to Bohr.s atomic theory, which of the following relation (s) is (are) correct ?

Answer»

KINETIC energy of ELECTRON `prop (Z^(2))/(n^(2))`
The product of velocity of electron and the principal QUANTUM number `prop Z^(2)`
Frequency of REVOLUTION of the electron in an ORBIT `prop (Z^(2))/(n^(3))`
Coulombinc force of attraction of the electron `prop (Z^(3))/(n^(4))`

Answer :A::C::D
Discussion
48.

According to Avogadro law the correct statements are a) Volume of gas is proportional to the no. of moles at constant T and P b) The pressure of a gas is directly proportional to temp. of the gas under all conditions c) Equal volumes of different gases under similar conditions consist of equal no. of molecules d) Equal volumes of different gases under same conditions have equal no. of atoms

Answer»

B,c
a,c
d,b
c,d

Answer :B
Discussion
49.

According to Aufbau's principle, which of the three 4d, 5p and 5s will be filled with electrons first

Answer»

4D
5p
5s
4d and 5s will be filled simultaneously

Solution :According to the Aufbau's PRINCIPLE, electron will first ENTERS in those ORBITAL which have least energy . So decreasing ORDER of energy is 5p gt 4d gt 5s
Discussion
50.

According to Arrhenius, what is acid and base ?

Answer»

Solution :Acid : An acid is DEFINED as a substance which contains HYDROGEN and which when dissolved into water gives hydrogen IONS `(H^+)`
e.g., `HX overset"water"to H_((aq))^(+) + X_((aq))^(-)`
Base : A base is defined as a substance which contains hydroxyl groups and which when dissolve in water gives hydroxide ions `OH_((aq))^(-)`
`MOH_((aq)) to M_((aq))^(+) + OH_((aq))^(-)`
Discussion