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.

The solubility of AgCl in water and 0.1 NaCl, in which one it is more ?

Answer»

SOLUTION :The SOLUBILITY of AGCL is more in WATER and LESS in AgCl.
Discussion
2.

The velocityof electronin orbitdepends on whichfactors ?

Answer»

SOLUTION :As thepositivechargeof NUCLEUSINCREASE THEVELOCITY of electronincrease.
Asthe principlequantumnumberincreasethevelocityof electronincrease.
Discussion
3.

What is a semiconductor ? Mention the two main types of semiconductor.

Answer»

SOLUTION :Solids which have conductivity INBETWEEN those of CONDUCTORS and insulator , i.e., ranging from `10^(-6)` to `10^4 "ohm"^(-1) m^(-1)` are called semiconductors. The two main types are n-type and p-type.
Discussion
4.

Which of the following gas when passed through dilute blood will impart a cherry red colour to the solution ?

Answer»

`CO_(2)`
`COCl_(2)`
`NH_(3)`
`CO`

Solution :COwhen passed through dilute blood IMPARTS it a CHERRY red COLOUR
Discussion
5.

Which among the following is/are correct about chromium ?

Answer»

Its electronic configuration is `3d^4 4s^1`
Total spin of chromium =3
Spin multiplicity of 3d-subshell of chromium = 6
MAGNETIC moment of chromium is `sqrt(48)`

SOLUTION :`Cr_(24) to 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 2s^1`
Total spin = Number of unpaired
electron `xx 1/2 = 6 xx 1/2 = 3`
Spin multiplicity
`= (2sum s+1) = 2 xx 5 xx 1/2 + 1= 6`
Magnetic moment `=sqrt(N(n+2))`
where n= number of unpaired electrons.
`=sqrt(6xx8) = sqrt(48) ` B.M.
Discussion
6.

Which one of the following statements about the zeolites is false ?

Answer»

They are used as cation exchangers
They have open structure which enables them to TAKE up small molecules.
Zeolites are aluminosilicates having three dimensional network.
Some of the `SiO_4^(4-)`units are replaced by `AlO_4^(5-)`and `AlO_6^(9-)`ions in zeolites.

Solution :Zeolite are microporous crystalline solid with well DEFINED structure. They contain silicon, aluminium and oxygen in their framework and CATIONS, water and other molecules within their pores. The general formula of zeolite is `M_(x//y) [(AlO_2)_x (SiO_2)_y]. mH_2O` .
Discussion
7.

What is r.m.s speed of O_(2)molecule if its kinetic energy is 2 k cal "mol"^(-1)?

Answer»

`7.24 xx 10^`2 m/sec 
`3.5 xx 10^2` m/sec 
`1.8 xx 10^1` m/sec 
`3.5 x 10^1` m/sec 

Solution :`KE = 3/2 PV implies underset(RMS)(C ) = sqrt((3PV)/(M)) = sqrt((2KE)/M)`
`sqrt((2 xx 2 xx 10^3 xx 4.18)/(32 xx 10^(-3)) = 7.24 xx 10^(2)` sec.
Discussion
8.

Which one of the following has least acidic character?

Answer»

HCOOH
`CH_(3)COOH`
`CH_(2)CICOOH`
`C CI_(3)COOH`

ANSWER :B
Discussion
9.

Which of the following alkenes on ozonolysis give a mixture of ketones only ?

Answer»

`CH_3-CH=CH-CH_3`
`CH_3-undersetunderset(CH_3)|CH-CH=CH_2`

Solution :Alkenes which have two substituentson each carbon atom of the double BOND, give mixture of ketones on azonolysis , i.e., option (C ) and (d) .

On the other hand, alkenes (a) and (B) give a mixture of two aldehydes.

(b)`CH_3-undersetunderset(CH_3)|CH-CH=CH_2 underset((ii)Zn//H_2O)OVERSET((i)O_3//C Cl_4, 196 K)to underset"2-Methylpropanal"(CH_3-undersetunderset(CH_3)|CH-CH=O)+underset"Methanal"(O=CH)`
Discussion
10.

Which of the following statements are incorrect?

Answer»

 `Li^(+)` has minimum DEGREE of HYDRATION among alkali METAL cations.
The oxidation state of K in `KO_(2) is +1`
Sodium is used to make `NA//Pb` alloy.
`MgSO_(4)` is readily soluble in water.

Solution :`Li^(+)` has maximum degree of hydration among alkali metal cations
`Li^(+) gt Na^(+) gt K^(+) gt Rb^(+)gtCs^(+)`
Discussion
11.

which quantum number tends to specify the orientation in space for an orbital ?

Answer»

SOLUTION :MAGNETIC QUANTUM NUMBER
Discussion
12.

Write the isomers of the compound whose molecular formula is C_(4)H_(9)Br.

Answer»

SOLUTION :.
Discussion
13.

Why are alkali metals always univalent? Which alkali metal ion forms largest hydrated ion in aqueous solution?

Answer»

Solution :They are always univalent because after losing one electron, they acquire NEAREST inert gas configuration. Lit forms largest hydrated CATIONS because it has the highest HYDRATION energy.
Discussion
14.

X overset("Soda lime ")rarrY overset(Cl_(2)//uv-"light")rarrZ-overset(2Na)underset("dry either")rarr CH_3 - CH_(2) - CH_(2) - CH_3+2NaCl Then X, Y and Z include

Answer»

Sodium ethanoate, ETHANE and EHTYL chloride
Sodium propanoate, ethane and METHYL chloride
Sodium butanoate, ethane and ehtyl chloride
Sodium propanoate, ethane and ETHYL chloride

Answer :D
Discussion
15.

What are electrophile? Give an example.

Answer»

Solution :The electron DEFICIENT SPECIES are CALLED electrophiles.
EG: `Br^(+)` or `CH_(3)^(+)` or `NO_(2)^(+)` or any suitable example.
Discussion
16.

Total volume of atoms present in a face-centred cubic unit cell of a metal is (r is atomic radius)

Answer»

`12/3pir^(3)`
`16/3pir^(3)`
`20/3pir^(3)`
`24/3pir^(3)`

SOLUTION :The total NUMBER in the unit CELL of FCC =4
Volume of the atom =`4//3pir^(3)`
Total volume in the unit cell
`=4times4/3pir^(3)=16/3pir^(3)`
Discussion
17.

What are the reasons behind the Moseley's attempt in finding atomic number?

Answer»

Solution :(i) The number of electrons INCREASES by the same numbers as the increase in the atomic number.
(ii) As the number of electrons increase , the electronic structure of the ATOM changes.
(iii)Electrons in the OUTERMOST shell of an atom (valence shell electrons) DETERMINE the CHEMICAL properties of the elements.
Discussion
18.

What is frequency of first line of Balmer series for H-atom ?

Answer»

`3.29 xx10^(15) s^(-1)`
`8.05 xx10^(13) s^(-1)`
`8.22 xx10^(15) s^(-1)`
`4.57 xx10^(14) s^(-1)`

Solution :First lineof balmer series of h atom
`therefore` form n=3 to n=2 electron transition
`V=(triangleE)/(h)`
`=(2.18 xx10^(-18)j)/(6.626xx10^(-34)js)(1)/(3^(2))-(1)/(2^(2))`
`=-0.4569 xx10^(15)`
`=-4.57 xx10^(14)s^(-1)`
Discussion
19.

Which one of the following is a hydrophobic sol

Answer»

STARCH solution
Gum solution
Protein solution
Arsenic solution

Answer :D
Discussion
20.

What is a sigma bond ?

Answer»

Solution :SIGMA bond is a bond FORMED by the OVERLAPPING of ATOMIC ORBITAL along the axis.
Discussion
21.

Which element of group 2 is used in treatment of cancer ?

Answer»

Magnesium
Radium 
STRONTIUM 
BERYLLIUM 

ANSWER :B
Discussion
22.

Which of the following solutions will have the highest specific conductance ?

Answer»

0.001 N
0.0001 N
0.1 N
1.0 N

Solution :Because SPECIFIC CONDUCTANCE INCREASES on INCREASING the CONCENTRATION.
Discussion
23.

Write short note on the following bond parameter . Bond angle

Answer»

Solution :Bond angle : Covalent bonds are directional in NATURE and are oriented in specic directions in space. This directional nature creates a FIXED angle between two covalent bonds in a MOLECULE and this angle is termed as bond angle .
Discussion
24.

When the frequency of the incident radiation on a metallic plate is doubled, KE of the photoelectrons will be

Answer»

doubled
halved
more than doubled
increases but less than doubled.

Solution :`KE_(1) = HV - W_(0), KE_(2) = 2 hv - W_(0)`
If `KE_(2)` were equal to `2 hv - 2 W_(0), KE_(2)` would have been `2 XX KE_(1)`.
As `(2 hv - W_(0)) gt (2 hv - 2 W_(0))`, hence,
`KE_(2) gt 2KE_(1)`
Discussion
25.

What happens when boricacid is heated ?

Answer»

Solution :`4H_(3)BO_(3) OVERSET(370K)underset(-4H_(2)O)rarr 4HBO_(2) underset(-H_(2)O)overset(410 K)rarr H_(2)B_(4)O_(7) overset(" Redheat ")rarr 2B_(2)O_(3) +4H_(3)BO_(3)`
Discussion
26.

Which is least soluble in water ?

Answer»

NACL
`Na_(2)S`
`MgCl_(2)`
MgS

Answer :D
Discussion
27.

Which one of the following compounds hassp^(2) hybridisation ?

Answer»

`CO_(2)`
`SO_(2)`
`N_(2)O`
`CO. `

Solution :`SO_(2)` is V-shaped molecule with BOND angle` 119^(@) 30'`
and involves`SP^(2)` HYBRIDISATION .
Discussion
28.

Which of the following reactions are not feasible?

Answer»

`HC-=CH + KOH to `
`HC -= CH + NaNH_2 to `
`HC-= CH + NAOHTO`
`HC -= Coverset(odot)(K^(OPLUS)) + (CH_3)_3C-Br to `

Solution :Alkynes do not react with NAOH .B. is feasible. Aceatylide anion, being a strong base, WOULD react with tertiary alkyl halides by elimination
Discussion
29.

Which of the following pair of ions makes the water hard

Answer»

`NA^(+), SO_4^(2-)`
`K^(+) , HCO_3^-`
`CA^(2+) , NO_3^(-)`
`NH_4^(+), Cl^(-)`

Solution :`HCO_3^-` is main REASON of temporary hardness of WATER.
Discussion
30.

Which type of isotops of C_(4)H_(8) are possible ? Give their names and structure.

Answer»

Solution :(i) `("Saturated CYCLIC HYDROCARBON")/("CYCLOBUTANE")`
(ii) Unsaturated hydrocarbon :
Discussion
31.

Which one of the following correctly represents the variation of electronegativity (EN) with atomic number (Z) of group 13 elements?

Answer»




ANSWER :D
Discussion
32.

Which molecule has higher enol content

Answer»

`CH_(3)-underset(O)underset(||)(C)-CH_(3)`
`CH_(3)-underset(O)underset(||)(C)-underset(O)underset(||)(C)-CH_(3)`
`CH_(3)-underset(O)underset(||)(C)-CH_(2)-underset(O)underset(||)(C)-CH_(3)`

ANSWER :C
Discussion
33.

When will DeltaH= Deltau for chemical reaction?

Answer»

Solution :When `Deltan_((G)) = 0, DELTAH= DELTAU`.
Discussion
34.

The species having pyramidalshape is

Answer»

`SO_(3)`
`BrF_(3)`
`SiO_(3)^(2-)`
`OSF_(2)`

Solution :In VSERP theory, double BOND is counted as one
bond pair. THEREFORE , no. of bond pairs around the
CENTRAL S atom `= 2 (S-F)+ 1 (S = O)=3 `
No. of electron pairs around S atom
`= ( 6 + 2 + 0 //2 = 4 `
No .of lone pairs ` 4-3= 1`
Now accordingto VSEPR theory , a molecule with
threebond pairs and one lone pair mustbe
pyramidal.
Discussion
35.

Which of the following conclusions could not be derived from Rutherford's alpha-particle scattering experiment ?

Answer»

Most of the space in the atom is empty
The radius of the atom is about `10^(-10)` m while that of NUCLEUS is `10^(-15)m`
Electrons move in a circular PATH of fixed energy called orbits
Electrons and the nucleus are HELD TOGETHER by electrostatic forces of attraction

Solution :CONCEPT of cirular paths of fixed energy was put forward by Bohr an not derived from Rutherford's scattering experiment
Discussion
36.

What are hybridisation states of each carbon atom in the following compounds ? CH_(2) = C = O, CH_(3)CH = CH_(2), (CH_(3))_(2)CO, CH_(2) = CHCN,C_(6)H_(6).

Answer»

SOLUTION :`overset(sp^(2))(C)H_(2) = overset(sp)(C) = O, ""overset(sp^(3))(C)H_(3) - overset(sp^(2))(C)H = overset(sp^(2))(C)H_(2), "" overset(sp^(3))(C)H_(3) - underset(sp^(2))overset(O)overset(||)(C)-overset(sp^(3))(C)H_(3)`
`overset(sp^(2))(C)H_(2)=overset(sp^(2))(C)H - overset(sp)(C) -= N`,
Discussion
37.

Write the structural formulae of all the possible isomers of C_2H_2Cl_2 and indicate which of them is non-polar ?

Answer»

SOLUTION :(i)cis-1,2-dichloroethene , (II) trans-1,2-dichloroethene and (III)1,1-dichloroethene, (ii) is NON POLAR
Discussion
38.

Which of the following classes of organic compounds show metamerism?

Answer»

Ethers
Secondary amines
Ketones
Any of the three

Answer :D
Discussion
39.

What would be the electronic configuration of HeH^(-) molecular ion ? Calculateits bond order and comment on its stability .

Answer»

Solution :Total NUMBER of ELECTRONS in `HeH^(-) = 2 + 1 + 1 = 4therefore ` Its electronic configuration will be `sigma _(1s)^(2)sigma _(1s)^(**2)`
Bond order = `(1)/(2) (2-2) = 0 ` . Hence , this ION does not exist .
Discussion
40.

Which of the following possess almost same properties due to lanthanide contraction?

Answer»

Zr, HF
NA, K
Zn, CD
Ag, AU

Solution :Zn, HF
Discussion
41.

what information is observed from positive , zero and negative volumes of change in entropy ?

Answer»

SOLUTION :`DeltaSlt0` = The PROCESS is non - spontaneous
`DeltaSlt0` = The process exist in EQUILIBRIUM.
`DeltaSlt0` = The process is spontaneous
Discussion
42.

Which of the following is/are incorrect order of percentage enolic content?

Answer»




SOLUTION :N//A
Discussion
43.

What is formula of compound if elements are given containing ? (i) Sodium and oxygen (ii) Aluminium and bromine (iii) Silicon and oxygen(iv) Phosphorus and chlorine(v) 19^(th)element and iodine (vi) 18^(th)element and oxygen

Answer»

SOLUTION :
Discussion
44.

Which of the following contains unpaired electrons ?

Answer»

`NO_2`
`CO_2`
`NO_(2)^(-)`
`CN^(-)`

ANSWER :A
Discussion
45.

What is the potential drop through which an electron , witha de Broglie wavelength of 1.5 "Å" , should be accelerated , if its de Broglie wavelength should be reduced to 1 "Å" ?

Answer»

110 volts
70 volts
83 volts
55 volts

Answer :C
Discussion
46.

Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed structure ?

Answer»

A tetrahedral void is formed when a sphere of the second LAYER is present above triangular void in the first layer
All the triangular voids are not covered by the spheres of the second layer.
Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular shapes of these voids do not overlap
Octahedral voids are formed when the triangular voids in the second layerexactly overlap with similar voids in the first layer.

SOLUTION :(c ) is not true because octahedral voids are formed when triangular voids in the second layer lie above the triangular voids of the first layer .
(d) is not true because octahedral void is combination of TWO triangular voids one with vertex UPWARD and the other with vertex DOWNWARD and not their overlap
Discussion
47.

Which sub shell is filled up progressively in actinoids

Answer»

`1.4f`
5f
6d
7s

Answer :B
Discussion
48.

Whci alkyne will give 3-Ethyl heptane on catalytichydrogenation

Answer»




Solution : have TWO types of chemically DIFFERENT hydrogen atom so it forms two MONOCHLORO ISOMERS on photochemical chlorination.
Discussion
49.

Which of the following cases, reactant and product are correctly matched.

Answer»




Solution :CYCLO propyl methyl carbo cation can be REARRANGED to cyclo BUTYL carbo cation.
Discussion
50.

Write first elements of the period 1 to 7.

Answer»

SOLUTION :
Discussion