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 is the most abundant metal found in the human body? Explain how it Works inside the human body?

Answer»

Solution :Calcium is the most ABUNDANT metal found in the human body for egin TEETH and to
(ii) 2% of an adult weight is made up of calcium.
Calcium is PRESENT in teeth and bones in the form of calcium phosphate and carbonate and these make bone and teeth hard.
Al Water in the human body as in the blood and inside cells. contain DISSOLVED calc
(v) The calcium IONS are involved in muscle movement and sending electricity brain and along nerves
Discussion
2.

What is the significance of Lewis symbols.

Answer»

Solution :The NUMBER of dots in the lewis SYMBOL represents the number of valence electrons. The common valency of the element is EITHER EQUAL to the number of dots or 8 minus the number of dots.
Ex : For carbon the valency is 4. But valency of NITROGEN is 8-5=3 respectively.
Discussion
3.

To determine the boiling point, liquid is filled in

Answer»

CAPILLARY TUBE
BOILING tube
FUSION tube
Thiele's tube

Answer :C
Discussion
4.

Whichatom areindicatedby thefollowingconfiguration ?

Answer»

Solution :(a ) Electronicconfiguration(He ) `2s^(1)`
Atomicnumber `(2+1) =3` so2=3`:. LI`
(b ) electronicconfiguration: (Ne) `3s^(2) 3p^(3)`
Totalelectronz=10 + 2+3
(C )electronicconfiguration(Ar ) `4s^(2) 3d^(3)`
SCANDIUM (S c )element
Discussion
5.

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic sustances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according tot he following relation: Magnetic moment mu=sqrt(n(n+2))BM where n=number of unpaired electrons. BM stands for Bohr magneton, a unit of magnetic moment. 1BM=(eh)/(4pimc)=9.27xx10^(-24)Am^(2) or JT^(-1) Q. An ion of a d-block element has magnetic moment 5.92 BM. Select the ion among the following:

Answer»

`Zn^(2+)`
`SC^(3+)`
`Mn^(2+)`
`Cr^(3+)`

ANSWER :C
Discussion
6.

Which of the following does not satisfy Huckel's rule?(a) Benzene (b) 1, 3-cyclobutadiene (c) Naphthalene (d) Furan

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SOLUTION :1, 3-cyclobutadiene
Discussion
7.

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic sustances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according tot he following relation: Magnetic moment mu=sqrt(n(n+2))BM where n=number of unpaired electrons. BM stands for Bohr magneton, a unit of magnetic moment. 1BM=(eh)/(4pimc)=9.27xx10^(-24)Am^(2) or JT^(-1) Q. Which of the following ions are diamagnetic?

Answer»

`He^(2+)`
`SC^(3+)`
`MG^(2+)`
`O^(2-)`

Answer :B::C::D
Discussion
8.

Which of the following non-metal reacts with ordinary water?

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CARBON
Sulphur
Chlorine
Phosphorous

Answer :C
Discussion
9.

What is the characteristics of inductive effect?

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Solution :The INDUCTIVE effect is EXTENDED UPTO three carbon
Discussion
10.

Write electron dot structure (Lewis structure) of Na, Ca, B, Br, Xe, As, Ge, N^(3-).

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SOLUTION :SEE the TEXTBOOK or SOURCE FILES
Discussion
11.

Write IUPAC names of the products obtained by addition reactions of HBr to but-l-ene: (i) in the absence of peroxide and (ii) in the presence of peroxide.

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Solution :(i) In absence of PEROXIDE, the product FORMED is according to Markovnikov rule.
`CH_(3)-CH_(2)-CH-=CH_(2)+HBroverset("no peroxide")toCH_(3)-CH_(2)-CHBr-CH_(3)`
(ii) In presence of peroxide, the product formed is according to antiMarkovnikov rule.
`CH_(3)-CH_(2)-CH=CH_(2)+HBroverset("peroxide")toCH_(3)-CH_(2)-CH_(2)Br`
Discussion
12.

Which of the following molecule/ion have not unpaired /single electron ?

Answer»

`N_(2)^(+)`
`O_(2)^(2-)`
`O_(2)`
`B_(2)`

SOLUTION :`O_(2)^(2-)`
Discussion
13.

What is BHC ? How will you prepare BHC ? Mention its uses.

Answer»

Solution :(i) BHC is Benzene hexachloride.
(ii) Benzene reacts with three molecule of `Cl_(2)` in the PRESENCE of sunlight or UV light to yield BHC.
This is also called as GAMMAXANE or LINDANE.

(iii) BHC is a powerful insecticide.
Discussion
14.

When aqueous solution of borax isacidified with hydrochloric acid,a white crystalline solid is formed which is soapy to touch . Is thissolidacidic or basic in nature ? Explain.

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Solution :When an aqueoussolution of borax is acidifiedwith HCl,boric acid is formed.
`underset("Borax")(Na_(2)B_(4)O_7)+2HCl + 5H_(2)O rarr2NaCl + underset("Boric acid")(4H_(3)BO_(3))`.
Boric ACIDIS a white crystalline solid. Due to its planar layered structure , it is soapy to touch . it is not a protonic acidsince it does not ionize in aqueous solution to liberate `H^(+)` ions. HOWEVER,due to SMALL size of boron and presenceof only sixelectrons in its VALENCE shell, `B(OH)_(3)` accepts a pair of electrons from OXYGENATOM of a molecule of `H_(2)O`releasing a proton. Thus, it acts as Lewis acid.
Discussion
15.

The variation of boiling points of hydrogen halides is in tha order HF gt HI gt HBr gt HCl . What explains the higher boiling point of hydrogen fluoride ?

Answer»

There is strong hydrogen BONDING between HF molecules
The bond energy of HF molecules is greater
than in other hydrogen halides
The EFFECT of nuclear shielding is much REDUCED
in fluorine which polarises the HF molecule
The electronegativity of flurine is much
higher than for other elements in the group .

Solution :HF froms strong intermolecular hydrogen bonds
due to high elecrtonegatively of fluorine. Hence ,
the boiling point of HF is abnormally high. Boiling
points of other hydrogen halides GRADUALLY increase
from HCl to HI due to increase in the size of
halogen atom from Cl to I whihc results in the
increase of van Waal forces .
Discussion
16.

Which of the following is most soluble ?

Answer»

` Bi_2S_3 (K_(sp) =1xx 10^(-17))`
`MnS (K_(sp) = 7xx 10 ^(-16))`
` CuS (K_(sp)= 8 xx 10^(-37))`
` Ag_2S (K_(sp)=6 xx 10^(-51))`

Solution :For each , calculate S and compare.
`Bi_2S_3 : S = 5 sqrt(( 1xx 10 ^(-17))/( 108) ) , MnS: S =sqrt( 7xx 10 ^(-16))`
` CuS: S =sqrt(8xx 10 ^(-37) ) , Ag_2 S : S =3sqrt( ( 6 xx 1 0 ^(-51))/( 4))`
Discussion
17.

Which one of the following species does not exist under normal conditions ?

Answer»

`Li_(2)`
`Be_(2)^(+)`
`Be_(2)`
`B_(2)`

SOLUTION :`Be_(2) = sigma _(1S)^(2) sigma _(1s)^(**2) sigma_(2s)sigma _(2s)^(**2)B.O. = 0 ` ,
Discussion
18.

The secondary precursors of photochemical smog are :

Answer»

`SO_(2)` and `NO_(2)`
`SO_(2)` and HYDROCARBONS
`NO_(2)` and hydrocarbons
`O_(3)`and PAN

Answer :D
Discussion
19.

What will be the wavelength of a ball of mass 0.1 kg moving with a velocity of 10 ms^(-1) ?

Answer»

Solution :ACCORDING to de Broglie equation, `lamda = (h)/(MV) = (6.626 XX 10^(-34) kg m^(2) s^(-1))/((0.1kg) (10 MS^(-1))) = 6.626 xx 10^(-34) m`
Discussion
20.

What is the effect of introducing an alkyl group on the stability of carbocation?

Answer»

SOLUTION :It INCREASES because of HYPER CONJUGATION EFFECT.
Discussion
21.

What are Freons ? Discuss their uses and environmental effects.

Answer»

Solution :Freons are the chlorofluoro derivatives of methane and ethane.
Freon is represented as Freon - cba
Where, c = number of carbon atoms, b = number of hydrogen atoms,
a total number of fluorine atoms.
`CF_(2)Cl_(2)""c=1-1=0`
`H=0+1=1`
`F=2`
So Freom - 12 is `CF_(2)Cl_(2)`
Uses of Freons
(i) Freons are used as REFRIGERANTS in refrigerators and air conditioners.
(ii) It is used as a propellents for aerosols and foams.
(iii) It is used as propellant for foams to spray out deodroants, shaving creams and insecticides.
Environmental effects of Freons
(i) Freon gas is a very poerful greenhouse gas which mean that it traps the heat normally RADIATED from the earth out into the space. This causes the earth.s temperature to increase resulting in rising sea levels, droughts, stronger storms, flash floods and a host of other very unpleasant effect.
(ii) As freon MOVES throughout the air, its chemical ingredients causes DEPLETION of ozone layer. Depletion of ozone increase the amount of ultraviolet radiations that reaches the EARTHS surface, redulting in serious risk to human health. high levels of ozone, in turn, causes respiratory problems and can also kill plants.
Discussion
22.

Which one/ones of the following reactions will yield 2-propanol ? Choose the right asnwer from (A), (B), (C) and (D) I. CH_(2) = CH-CH_(3)+H_(2)O overset(H^(+))rarr II. CH_(3)-CHO underset((ii) H_(2)O)overset((i) CH_(3)MgI)rarr III. CH_(2)O underset((ii) H_(2)O)overset((i) C_(2)H_(5)MgI)rarr IV. CH_(3)=CH-CH_(3) overset("Neutral" KMnO_(4))rarr

Answer»

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

Solution :`HCHO (CH_(2)O)` with `C_(2)H_(5)MGI` will give a `1^(@)` alcohol and PROPENE `(CH_(2)=CH-CH_(3))` with neutral `KMnO_(4)` will give a diol. Therefore correct answer is A (I and f II).
`CH_(2)=CH-CH_(3)+H_(2)O underset("M.Rule")overset(H^(+))rarr CH_(3)-overset(OH)overset(|)(C)-CH_(3)`
`CH_(3)-CHO underset((ii) H_(2)O //H^(+))overset((i) CH_(3)MgI)rarr CH_(3)-overset(OH)overset(|)(C)-CH_(3)`.
Discussion
23.

Which postulate of kinetic theory are invalid at low temperature of high pressure?

Answer»

Solution :If the collision are non-elastic, there WOULD be constant LOSS of energy. This would cause MOLECULAR motion to slow down and ultimately settle down at the bottom of the container like precipitate.
Discussion
24.

whichof thefollowingrepresentsahomologousseries ?

Answer»




ANSWER :A
Discussion
25.

Which of the following is optically active?

Answer»

2 - Methylpentane
Citric ACID
GLYCEROL
NONE of these

Solution :2-Methylpentane
Discussion
26.

The self ionization of water is endothermic. While increase the temp. than what is the effect on pH and value of K_w ?

Answer»

Solution :`2H_2O_((l)) + "Heat" hArr H_3O_((aq))^(+)+OH_((aq))^(-)`
Then increase the TEMPERATURE and according to Le-Chatelier.s principle the reaction will be forward and increase products and `K_w` increase.
The VALUE of pH is LESS than 7. At higher temperature the pOH of water is high.
Discussion
27.

What are electron deficient compounds ? Are BCl_(3)" and "SiCl_(4) electron deficient species ? Explain.

Answer»

SOLUTION :The species in which the central atom possesses an incomplete octet (i.e., does not have 8 electrons in its VALENCE shell) are called electron DEFICIENT compounds. In `BCl_3`, the central BORON atom has only six electrons. Therefore, it is an electron deficient species. In `SiCl_4` the central silicon atom has eight electrons. Therefore, in accordance to the above definition, it is not an electron deficient species.
Discussion
28.

Which of the following hydrated salts will not become anhydrous on heating?

Answer»

`MgCI_(2).6H_(2)O`
`FeCI_(3).6H_(2)O`
`AICI_(3).6H_(2)O`
`CoCI_(2).6H_(2)O`

Answer :A::B::C
Discussion
29.

What is hybridization ? Give example. What is the meaning of hybridization?

Answer»

Solution :ln order to explain the characteristic geometrical shapes of polyatomic molecules like `CH_(4), NH_(3)`and `H_(2)O` etc. Pauling introduced the concept of hybridization.
Defutition of Pauling : According to him the atomic ORBITALS combine to form new set of equivalent orbitals known as hybrid orbitals. Unlike PURE orbitals, the hybrid orbitals are used in bond formation.
Definition of hybridization : The process of intermixing of the orbitals of slighting different engorging so as to redistribute their on orgies RESULTING in the formation of new set of orbitals of equivalent energies and SHAPE known as hybridization.
e.g. : One 2s orbital and there 2p orbitals of carbon mix & form equivalent four sp3 hybrid orbitals.
Discussion
30.

What are organic reduction reactions? Give an example.

Answer»

SOLUTION :Most of the reduction reaction of ORGANIC COMPOUNDS involves GAIN of hydrogen or LOSS ofoxygen.
Example:
Discussion
31.

Which one of the following statements is not true?

Answer»

pH of drinkingg water should be between 5.5-9.5
Concentration of DO below 6 ppm is good from the GROWTH of fish
Clean water would have a BOD value of less than 5 ppm
Oxides of SULPHUR, NITROGEN and CARBON are the most widespread air pollutant

Answer :B
Discussion
32.

Which of the following functional group is in CH_(3)(CH_(2))_(2)COCl?

Answer»

Aldhyde
Acly halide
Carbonyl ketone
Ketone

Answer :B
Discussion
33.

What is electronegativity? How is this useful in understanding the nature of elements?

Answer»


Answer :TENDENCY of an ATOM in a molecule to ATTRACT the shared pair of electrons towards itself. If EN difference `gt`1.7, IONIC bond is formed.
Discussion
34.

Which of the following is a mono-atomic molecule?

Answer»

Hydrogen
Oxygen
Sodium
Ozone

Answer :C
Discussion
35.

The relative reactivity of 1^@,2^@,3^@ hydrogen's towards chlorination is 1:3.8:5. Calculate the percentages of all monochlorinated products obtained from 2-methylbutane.

Answer»

Solution :2-Metylbutane has 4 different sets of equivalent HYDROGEN atoms marked as 'a', 'b' , 'c' and 'd'
`oversetaCH_3-oversetoverset(.^aCH_3)|(.^BCH)-oversetcCH_2-oversetdCH_3` 2-Methylbutane and HENCE gives four different types of monochlorinated products . These are :

Relative number of equivalent hydrogens , a:b:c :d =6:1:2:3
Relative amounts of A, B, C and D = No. of hydrogen x relative REACTIVITY
`{:("Relative amounts :",A(1^@),B(3^@), C (2^@),D (1^@)),(,6xx1=6,1xx5=5,2xx3.8=7.6,3xx1=3):}`
Total amount of monohaloginated COMPOUNDS = 6+5+7.6+3=21.6
% A =`(6xx100)/21.6`=27.72 , %B=`5/21.6xx100`=23.15, %C=`7.6/21.6xx100=35.22` , %D=`3/21.6xx100=13.85`
Discussion
36.

Whichone iscorrect for electronin 4forbital

Answer»


ANSWER :C
Discussion
37.

The role of 'Molybdenum' in Uaber's synthesis is

Answer»

A POSITIVE CATALYST 
A NEGATIVE catalyst
Poison for catalyst 
PROMOTER for catalyst 

ANSWER :D
Discussion
38.

What happen if HCl gas passed in NaCl solution ?

Answer»

Solution :(i)`NaCl_((s)) hArr Na_((aq))^(+) + Cl_((aq))^(-)` saturated solution
(ii)`HCl_((g)) overset(H_2O)to H_((aq))^(+) + Cl_((aq))^(-)`
Here, `Cl^-` is COMMON ION so concentration is increase so reaction TAKE place in reverse DIRECTION and solid precipitation of NaCl take place.
So with HIGH purity solid NaCl obtained and impurities of `Na_2SO_4` and `MgSO_4` removed.
Discussion
39.

What is meant by nodal surface ?

Answer»

Solution :(I) The REGION where there is probability DENSITY function reduces to ZERO is called nodal surface or a radial surface. ltbr GT (ii) For ns orbital.(n-1)NODES are found in it.
Discussion
40.

Write the conjugate acids for the bronsted bases. NH_2^(-) , NH_3 and HCOO^-

Answer»

SOLUTION :`NH_3, NH_4^(+) , HCOOH`
Discussion
41.

Which one of the following does NOT involve coagulation:-

Answer»

Formation of delta regions
peptization
Treatment of DRINKING water by potash alum
Clotting of blood by the use of ferric chloride

Solution :The dispersion of a freshly precipitated material into colloidal solution by the ACTION of an electrolyte solution is termed peptization. It INVOLVES the adsorption of SUITABLE ions and the electrically charged particles then splits from the precipitate as colloidal particles.
Discussion
42.

What type of structures are exhibited by (a) BaCl_(2) (b) Na_(2)O

Answer»

SOLUTION :FLUORITE TYPE STRUCTURE (B) Antifluorite type structure.
Discussion
43.

Which of the following is the least stable resonance structure of CH_(2)=CH-CHO

Answer»




All are EQUALLY stable

Solution :AMONG the given resonance STRUCTURES
`overset(Ɵ)(C)H_2 - CH - overset( overset(OPLUS)O) overset(|)CH`
is the least stable one since more EN atom, O is carrying positive charge.
Discussion
44.

Whichof the following is a homongenous mixture?

Answer»

Milk
A mixture of TWO MINERALS such as galena (BLACK) andquartz (white)
Bluecopper (II) SULPHATE solution
Foggy air

Solution :It is an AQUEOUS solution of copper `(II)` sulphate. Milkand foggyair arecolloidate solutions.
Discussion
45.

Which of the following is/are the correct Fischer projection of the followings

Answer»




SOLUTION :Cheak R/S configuration FISCHER is in ECLIPSE form so first we have to convert above compound into total eclipsed from .
Discussion
46.

The substituents which are deactivating but ortho para directing in aromatic substitutions are -NO , -CHO, -F , -Cl, -Br , -CH = CHCHO, - C_6H_5, - COCl, -NH_3 .

Answer»

SOLUTION :AROMATIC SUBSTITUTIONS
Discussion
47.

What will be the molarity of a solution, which contains 5.85g of NaCl_((s))per 500 mL ?

Answer»

4 mol `L^(-1)`
20 mol `L^(-1)`
0.2 mol `L^(-1)`
2 mol `L^(-1)`

Solution :Molarity (M) is obtained by following equation,
Molarity `=("weight" xx 1000)/("molecular weight" xx "volume (mL)")`
`=(5.85xx1000)/(58.5xx500) = 0.2 "mol "L^(-1)`
Note : Molarity of solution depends UPON the temperature because volume of solution is CHANGE with temerature .
Discussion
48.

Which of the following salts is the most basic in aqueous solution?

Answer»

`Al(CN)_3`
`CH_3COOK`
`FeCl_3`
`Pb(CH_3COO)_2`

Solution :`CH_3 COOK` has basic solution.
Discussion
49.

Which of the following pairs can be cited as an example to illustrate the law of multiple proportion?

Answer»

`Na_(2)O,K_(2)O`
`CaO,MgO`
`Al_(2)O_(3),Cr_(2)O_(3)`
`CO,CO_(2)`

Solution :Same elements FORM different compounds
Discussion
50.

Which is used forending charge on colloidal solution?

Answer»

Electrons
ELECTROLYTES
Positively charged ions
Compounds.

Solution :Electrolytes neutrize the charge on COLLOIDAL PARTICLE and COAGULATION occurs.
Discussion