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 statements are correct for alkali metal compounds? I. Superoxides are paramagetic in nature. II. The basic strength of hydroxides increases down the group. III. The conductivity of chlorides in their aqueous solutions decreases down the group. IV. The basic natuer of carbonates in aqueous solution is due to cationic hydrolysis.

Answer»

I,II and III
I and II
II,III and IV
III and IV

SOLUTION :The CONDUCTIVITY of alkali metal chlorides in their aqueous solution increaes on moving down the group and basic NATURE of carbonates in aqueous solution is due to anionic hydrolysis.
Discussion
2.

Unknown organic metal oxide (A) heated with carbon will gives compound (B), which on reaction with water gives ethyne. So what are the compound A and B ?

Answer»

SOLUTION :`underset("LIME")underset((A))(CaO)+3C overset(-CO)RARR underset("Calcium carbie")underset((B))(CaC_(2))underset(-Ca(OH)_(2))overset(+2H_(2)O)rarr underset("Ethyne")(C_(2)H_(2))`
Discussion
3.

Which one is not a pollutant normally ?

Answer»

HYDROCARBONS
Corbondioxide
CARBONMONOXIDE
SULPHER dioxide

Answer :B
Discussion
4.

Which group P-block elements show highest positive oxidation state ?

Answer»

GROUP 16
Group 17
Group 18
Group 15

Answer :C
Discussion
5.

Which of the following parameter cannot be estimated by using Born-Haber cycle?

Answer»

HYDRATION energy
ELECTRON affinity
ELECTRONEGATIVITY
BINDING energy of electrons.

Answer :C::D
Discussion
6.

Who received noble price for the work on chemical bonds?

Answer»

SOLUTION :LINUS PAULING.
Discussion
7.

What are (A), (B) and ( C) in the following scheme of reactions ?

Answer»

SOLUTION :
Discussion
8.

Tyndall effect would be observed in a

Answer»

solution
Solven
Colloidal solution
Precipitation

Answer :C
Discussion
9.

When benzene sulfonic acid and p-nitrophenol are treated with NaHCO_(3), the gases released respectively are

Answer»

`SO_(2), NO_(2)`
`SO_(2), NO`
`SO_(2), CO_(2)`
`CO_(2), CO_(2)`

SOLUTION :`CO_2 , CO_2`
Discussion
10.

The uncertainty in the position and velocity of a particle are 10^(-10)m and 5.25 xx 10^(-24) ms^(-1). What is the mass of the particle ? (h = 6.625 xx 10^(-34) Js)

Answer»

SOLUTION :`Deltax=10^(-10)m""Deltav=5.25xx10^(24)ms^(-1)`
`m=(6.625xx10^(-34)kgm^(2)s^(-1))/(4xx3.1416xx10^(-10)mxx5.25xx10^(-24)ms^(-1))`
`"Mass of a particle" =" 0.1004 KG or 100.4 g "`
Discussion
11.

What is units of co-efficient of viscosity.

Answer»

SOLUTION :Ns `m^(-2)=` Newton SEC / square meter
`Pa s^(-1)=` Pascal / sec.
CGS = Poise
1 poise `= 1g CM^(-1)s^(-1)=10^(-1)kg m^(-1)s^(-1)`
SI unit kg `m^(-1)s^(-1)=10xx` Poise
Discussion
12.

What orbitals can overlap to form a sigma-bond and which orbitals can do so to form a pi-bond ?

Answer»

SOLUTION :s-s,s-p,p-p for ` SIGMA `-BOND and only p-p for `PI`-bond.
Discussion
13.

Write the minimum and maximum valencies of elements.

Answer»

Solution :The minimum valency EXHIBITED by an ELEMENT is zero.
The maximum valency exhibited by OS, Ru or XE in its compounds is 8.
Discussion
14.

Which among the given molecules are exhibit tautomerism?

Answer»

III only
Both I and III
Both I and II
Both II and III

Answer :A
Discussion
15.

Which of the following cations are more stable than benzyl cation ?

Answer»




ANSWER :`(a,C,d)`
Discussion
16.

You are given the following bond energy data E_(H-H) = 104.2 kcal mol ^(-1),E_(F-F) = 36.6kcal mol ^(-1), E_(H-F) = 134.6 kcal mol ^(-1) On the basis of this data, eletronegativity of flurine will be ……….

Answer»


Solution :Suppose the electronegativity of H and F are
reprsented as `chi_(H) and chi_(F)`RESPECTIVELY . APPLING
Pauling's formula
`|chi_(H)- chi_(F) |=0.208sqrt(Delta) `
`Delta= BE (H-F) - sqrt(BE(H-H)xxBE(F-F))`
`= 134.6 - sqrt(104.2xx36.6)`
`= 134.6 - 61.8`kcal mol `^(-1)`
72. 8kcal mol `^(-1)`
`therefore|chi_(H)- chi_(F) |=0.208sqrt(72.8) = 1.77`
As `chi_(F)gt chi_(H),chi_(F)= 1.77 + chi_(H) = 1.77+2.1 = 3.87`
Discussion
17.

Which of the following concentration terms is/are independent of temperature?

Answer»

MOLALITY
molarity
MOLE FRACTION
(a) and (c)

Solution :Molality and mole fraction are independent of TEMPERATURE.
Discussion
18.

What do you mean by torsional strain ?

Answer»

Solution :Alkanes can thus have INFINITE number of conformation by rotation around C-C single bonds.
However, it may be remembered that rotation around a C-C single BOND is not COMPLETELY free. It is hindered by a small energy barrier of 1-20 kJ `MOL^(-1)` due to weak replusive interaction between the adjacent bonds. Such a TYPE of repulsive interaction is called torsional strain.
Discussion
19.

Write the equation of Henderson Hassel balch.

Answer»

Solution :`pH=log K_a (["CONJUGATE BASE" , A^-])/"[WEAK ACID, HA]"`
Discussion
20.

Which is a homogenous mixtures fo copper and Zinc?

Answer»

BRASS
GOLD
SILVER
STEEL

ANSWER :A
Discussion
21.

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

Answer»

nuclear charge (Z)
valence principal quantum number (n)
ELECTRON electron INTERACTION in the outer orbitals
none of the FACTORS because their SIZE is the same.

Answer :a
Discussion
22.

Which of the following ppt. is soluble in both aqua regia and sodium disulphide (yellow)?

Answer»

`(Hg +HGS)`
`HgS`
`CUS`
`Ag_(2)S`

Answer :A::B
Discussion
23.

Which one of the following elements is unable to form MF_6^(3-)ion ?

Answer»

In
Ga
B
Al

Solution :B
Discussion
24.

What is coordination number of Na^(+) and Cl^(-)ion in Nacl ?

Answer»

SOLUTION :Each has a COORDINATION NUMBER of 6, i.e. each ION is surrounded by SIX oppositely charged ions.
Discussion
25.

Using the Gibb's free energy change,DeltaG^(@) =+63.3kJ for the following reaction Ag_(2)CO_(3)(s)hArr2Ag^(+)(aq)+CO_(3)^(2-)(aq) the K_(sp) of Ag_(2)CO_(3) in water at 25^(@)C is (R=8.314 JK^(-1) "mol"^(-1))

Answer»

`3.2xx20^(-26)`
`8.0xx10^(-12)`
`2.9xx10^(-3)`
`7.9xx10^(-12)`

Solution :`Delta G^(@) = - 2.303 ` RT log `K_(SP)`
`63.3xx10^(3)J =- 2.303xx8.314xx298 logK_(sp)`
`=-5705. 84 log K_(sp)`
or log `K_(sp)=(63.3xx10^(3))/(57.5.84)=-11.09`
`:. K_(sp)=` ANTILOG `(bar(12).91)`
`=8.128xx10^(-12)`
Discussion
26.

Which ofthe following metal oxides is antiferromagnetic in nature ?

Answer»

`MnO_(2)`
`TiO_(2)`
`NO_(2)`
`CrO_(2)`

Solution :`MnO_(2)` is ANTIFERROMAGNETIC.
Discussion
27.

which of the following does not reduce Benedict's solution ?

Answer»

GLUCOSE
FRUCTOSE
sucrose
ALDEHYDE

ANSWER :C
Discussion
28.

Which of the following is true for spontaneous adsorption of H_2 gas without dissociation on solid surface

Answer»

PROCESS is EXOTHERMIC and `DELTAS lt 0`
Process is endothermic and `DeltaS GT 0`
Process is exothermic and `DeltaS gt 0`
Process is endothermic and `DeltaS lt 0`

Answer :A
Discussion
29.

When a gas is compressed at constant temperature

Answer»

the SPEEDS of the MOLECULES increase
the COLLISIONS between the molecules increase
the speeds of the molecules decrease
the collisions between the molecules decrease

Answer :B
Discussion
30.

Two gases A and B have critical temperatures as 250 and 125 K respectively. Which one of these can be liquefied easily and why?

Answer»

Solution :GAS a can be EASILY liquefied. Because higher critical TEMPERATURE, greater is the intermolecular force of ATTRACTION.
Discussion
31.

What is the molecular formula of borax ?

Answer»

`Na_2B_4O_7 . 4H_2O`
`Na_2B_4O_10 . 10H_2O`
`NA B_4O_7 . 10H_2O`
`Na_2B_4O_7 . 10H_2O`

ANSWER :D
Discussion
32.

The sequence of ionic mobility in aqueous solution is

Answer»

`Rb^(+)gt K^(+) gt Cs^(+) gt Na^(+)`
`Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)`
`K^(+) gt Na^(+) gt Rb^(+) gt Cs^(+)`
`Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+)`

Solution :Bigger the size , lower is the extent of HYDRATION , smaller is the mass of the hydrated SPECIES and hence HIGHER is the ionic mobility in the aqueous solution . Thus OPTION (d) is correct .
Discussion
33.

Which of the following is correct order of stability of alkene?

Answer»




SOLUTION :As the NUMBER of `ALPHA`-H increases stability of alkene increases
Discussion
34.

Whatshould be ther ratio of velocities of CH_4 and O_2 moleculesso that they are associated with de Broglie waves of equal wavelength ?

Answer»


ANSWER :2
Discussion
35.

The total energy of the electron of H-atom in the second quantum state is -E_(2). The total energy of the He^(+) atom in the third quantum state is:

Answer»

`-((3)/(2))E_(2)`
`-((2)/(3))E_(2)`
`-((4)/(9))E_(2)`
`-((16)/(9))E_(2)`

Solution :Energy of electrons in N TH state
`=-(Z^(2))/(n^(2))xx13.6eV`
`E_(2)(H)=-(13.6)/(1)eV`
`E_(3)(He^(+))=-(13.6xx4)/(9)eV`
`(E_(2))/(E_(3))=(9)/(4)"or"E_(3)=(4)/(9)E_(2)`.
For negative value of `E_(2),E_(3)` will also be negative.
Discussion
36.

Which bond angle is high from PH_(3) and PH_(4)^(+)? Why ?

Answer»

Solution :In `PH_(4)^(+)` , bond angle is high because it is TETRAHEDRAL and angle is `109.5^(@)` .
In `PH_(3) , SP^(3)` hybridization occurs but non- bonding `e^(-)` pair present on P, So due to REPULSION and bond angle is decrease `(93.6^(@))`
Discussion
37.

What is molecular hydride?Explain with an examples.

Answer»
Discussion
38.

Which of the following can shown tautomerism?

Answer»

HCN
`CH_(3)CN`
`CH_(3)NO_(2)`
`CH_(3)ONO`

SOLUTION :N//A
Discussion
39.

The tatol number of electron pairs in N_(2) O_(3) is

Answer»


Solution :
In each strcuture ,TOTAL number of LONE PAIRS = 8
Discussion
40.

which of the following aqueous solution has the highest bolling point?

Answer»

`0.1 M KNO_(3)`
`0.1 M Na _(3) PO_(4)`
`0.1 M BaCl _(2)`
`0.1 M K_(2) SO _(4)`

SOLUTION :Elevation of BOILING point is more in the case of `Na_(3)PO_(4)` (no. of INONS `4,3 Na ^(+), PO _(4) ^(3-))`
Discussion
41.

Whatwill be thewavelengthof a ballof mass0.1 kgmovingwitha velocityof 10 ms^(-1)

Answer»

SOLUTION :According to thede Broglieequation
`LAMBDA=(h)/( mv) `
`lambda =(6.626 xx 10^(34) js)/((0.1 kg10 ms^(-1))`
where m= 0.1 kg
v=10 `ms^(-1)`
`h= 6.626xx 10^(34) Js`
`=6.626 xx 10^(34) kg ^(-1) m^(-1) s^(2)` but`J= kg m^(2) s^(2)`
`=6.626 xx 10^(34) m`
Discussion
42.

Write the correct order of reducing character of 13th group elements in +3 states.

Answer»

Solution :Due to inert pair effect, stability of +1 STATE increases and that of +3 state decreases down the group. Order of reducing character in +1 state is : `AL gt B gt GA gt In gt Tl`
Discussion
43.

The threshold frequency V_0 for a metal is 7.0xx10^14 s^1. Calculate the kinetic energy of an electron emitted when radiation of frequency v=1.0xx10^15s^(-1) hits the metal.

Answer»

Solution :ACCORDING to Einstein’s equation Kinetic energy `=1//2m_eV^2=h(v-v_0)=(6.626xx10^(-34)Js)XX(1.0xx10^15s^-1-7.0xx10^14s^-1)=(6.626xx10^(-34)Js)xx(10.0xx10^14s^-1-7.0xx10^14s^-1)=(6.626xx10^(-34)Js)xx(3.0xx10^14s^-1)=1.988xx10^(-19)J`
Discussion
44.

Whichof thefollowingreactiondo NOToccur?

Answer»

`Be + 2HCI toBeCl+H_(2)`
`Mg+H_(2)SO_(4) toMgSO_(4)+H_(2)`
`Ca+H_(2)SO_(4)to CaSO_(4) +H_(2)`
`Sr+2HCI toSrCl_(2)+H_(2)`

ANSWER :A
Discussion
45.

Which one of the following ratio gives the purity of the metal (rho-resistivity (or) specific resistance)

Answer»

`(rho_(300^(@)C))/(rho_(4.2^(@)C))`
`(rho_(300k))/(rho_(4.2K))`
`(rho_(27k))/(rho_(4K))`
`(rho_(300k))/(rho_(4^(@)C))`

Answer :2
Discussion
46.

Which of the following molecule/ion do not have all the identical bond ?

Answer»

`SiF_4`
`XeF_4`
`BF_4^-`
`SF_4`

ANSWER :D
Discussion
47.

Which of the following has maximum hydrogen bonding?

Answer»

Ethyl amine
Ammonia
Ethyl alcohol
Diethyl ether

Solution :This is WELL indicated by b.p. of compounds. MOREOVER, hydrogen ATTACHED to oxygen forms STRONGER attached H-bond as compared to hydrogen attached to nitrogen.
Discussion
48.

What type of bond is responsible for the partial compensation of the electron deficiency of a boron halide ?

Answer»

<P>

SOLUTION :`p PI- p pi` BACK BONDING
Discussion
49.

Which one of the following two compounds is the stronger acid ? Explain why?

Answer»


ANSWER :`(##RES_CHM_GOC_II_E03_005_A01##)`
Discussion
50.

Which of the following are correct statement

Answer»

Hardy-Schulze RULE is related to coagulation
Brownian movement and Tyndall effect are SHOWN by colloids
When liquid is dispersed in liquid, it is called gel.
Gold number is a measure of protective POWER of lyophobic colloid

SOLUTION :(a) is correct, it is related to number of ions interacting with COLLOIDAL particles.
(b) Brownian movement is shown by colloidal solution due to collision between colloidal particles themselves and with that of particles of dispersionmedium. thyndall effect is due to scattering of lightt by colloidal particle.
(d) is correct because, higher the gold number, less will be protective power.
Discussion