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.

What is meant by a functional group? Identify the functional group in the following compounds (a) acetaldehyde (b) oxalic acid (c) dimethyl ether (d) methylamine

Answer»

Solution :(i) A funcnonal group is an atom or a specific COMBINATION of bonded atoms that react in a CHARACTERISTIC WAY, irrespective of the ORGANIC molecule in which it is PRESENT.
(ii)
Discussion
2.

When does the rate of backward reaction increase ? What is its consequence ? A+BhArrC+D

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Solution :(i) Initially only A and B are present. Soon, a few molecules of the products C and D are formed by the forward reaction.
(ii) As the concentration of the products increases, more products collide and react in the BACKWARD direction.
(iii) This leads to an INCREASE in the rate of backward reaction. As the rate of reverse reaction increases, the rate of the forward reaction decreases.
(iv) Eventually, the rate of both reactions BECOMES equal.
Discussion
3.

What do you mean by Alkane ? Explain the formation of alkane from methane, substituting the hydrogens by -CH_(3) groups ?

Answer»

Solution :* Alkanes are saturated open chain hydrcarbons containing carbon-carbon single bonds.
* Methane is the first member of this family. Methane is a gas found in coal mines and marshy PLACES. If you replace one hydrogen atom of methane by carbon and JOIN the required NUMBER of hydrogens to satisfy the tetravalence of the other carbon atom, this hydrocarbon with molecular formula `C_(2)H_(6)` is known as ethane. Thus you can consider `C_(2)H_(6)` as derived from `CH_(4)` by REPLACING one hydrogen atom by `-CH_(3)` group. Go on constructing alkanes by doing this theoretical exercise i.e., replacing hydrogen atom by `-CH_(3)` group.
`underset("Methane "(CH_(4)))(H-underset(H)underset(|)overset(H)overset(|)(C)-H) overset("Replace any H by "-CH_(3))rarr underset("Ethane "(C_(2)H_(6)))(H-underset(H)underset(|)overset(H)overset(|)(C)-underset(H)underset(|)overset(H)overset(|)(C)-H)`
The next molecules will be `C_(3)H_(8), C_(4)H_(10)`......
`CH_(4)underset(+CH_(3))overset(-H)rarr H_(3)C-CH_(3) underset(+CH_(3))overset(-H)rarr CH_(3)-CH_(2)-CH_(3)`

`underset("ISOBUTANE")(H_(3)C-underset(CH_(3))underset(|)(CH)+ CH_(3))+H_(3)C-underset("n-butane")(CH_(2)-CH_(2)-CH_(3))`
Discussion
4.

Which among the following method is the best for the preparationof BeF_(2)?

Answer»

`(NH_(4))_(2) BeF_(4) OVERSET(Delta)to`
`Be+F_(2) to`
`BeO +C +F_(2) overset(Delta)hArr`
`Be(OH)_(2(s)) +2HF to`

Solution :The best REACTION of formation of `BeF_(2)` is the DECOMPOSITION of `(NH_(4))_(2)BeF_(4)`
`(NH_(4))_(2)BeF_(4) overset(Delta)to BeF_(2)+2NH_(4)F`
Discussion
5.

What is meant by BOD?

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Solution :BOD is the amount of dissolved oxygen REQUIRED by microorganism to oxidise organic organic matter PRESENT in polluted water. It is expressed in ppm. This gives a REALISTIC MEASURE of the QUALITY of water.
Discussion
6.

Vinegar obtained from sugarcane has

Answer»

`CH_(3)COOH`
`HCOOH`
`C_(6)H_(5)COOH`
`CH_(3)CH_(2)COOH`

Solution :REFER to COMPREHENSIVE review
Discussion
7.

What isthe wavelengthelectron? What itindicate ?

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SOLUTION :`LAMBDA = 896.7 nm = 8.967 XX 10^(8) m`
it is morethanordinaryobject so electronhas WAVENATURE.
Discussion
8.

What is multiple bond ? Give difference between single bond, double bond and triple bond.

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SOLUTION :If ELECTRON pair between TWO atom is more than one it is called multiple BOND.
Discussion
9.

What is correct for resonance structure ?

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Solution :The CANNONICAL forms have no real existence.
The molecule does not exist for a certain fraction of time in one cannonical forms.
There is no such equilibrium between the cannonical forms as we have between tautomeric FORM in tautomerism.
The molecule as such has a single structure which is the RESONANCE hybrid of the cannonical form and which cannot as such be DEPICTED by a single Lewis structure.
Discussion
10.

What is meant by dead burnt plaster?

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SOLUTION :It is anhydrous CALCIUM sulphate `(CaSO_(4))`
Discussion
11.

Which of the following is not an algal nutrient

Answer»

HG
`PO_4^(3-)`
`NO_3^(-)`
`CO_2`

ANSWER :A
Discussion
12.

The space lattice given in the figure to :

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FLUORITE STRUCTURE
Rock SALT structure
Spinel structure
Inverse spinel structure

Answer :C
Discussion
13.

Which compound is reducing agent in the following equation ? CH_(3)CHO_((s))+Ag_(2)O_((s))toCH_(3)COOH+2Ag

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`CH_(3)COOH`
`Ag_(2)O`
`CH_(3)CHO`
Ag

Answer :C
Discussion
14.

Which elements are from the following ? Isoelectric Na, Na^(+) , F^(-) , F ?

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SOLUTION :`F^(-)" and " Na^(+)` are ISOELECTRIC elements they have 10 ELECTRONS.
Discussion
15.

Which observation will be correct about the major products X and Y of the following reaction.

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ANSWER :B::D
Discussion
16.

What per cent of its temperature pressure and volume are to 110^(@)C, 0.7 atm 1.0litre repectively ? .

Answer»


ANSWER :`81.96`
Discussion
17.

The stability of the following alkali metal chlorides follows the order :

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`LiCl gt KCl gt NaCl gt CS Cl`
`CsCl gt KCl gt NaCl gt LiCl`
`NaCl gt KCl gt LiCl gt CsCl`
`KCl gt CsCl gt NaCl gt LiCl`

Solution :The stability of a compound depends upon its enthalpy of formation , `DELTA H_(f)^(@)` . Evidently more NEGATIVE the value of `DeltaH_(f)^(@)` , more stable is the compound.The VALUES given in parentheses are in kJ `MOL^(-1)`.
Discussion
18.

What mass of NaCl would contain the same total number of ions as 245 g of MgCl_(2) ?

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ANSWER :225 G
Discussion
19.

Write the electronic configurations and the names of the elements having the atomic numbers 5, 9, 10, 19 and 20.

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SOLUTION :
Discussion
20.

What are ideal gases?

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SOLUTION :i) A gas that follows Boyle.s law, CHARLES. law and Avogadro law strictly is called an ideal gas. It is assumed that intermolecular forces are not present between the molecules of an ideal gas.
( ii) Ideal GASES are the gases that obey gas laws or gas EQUATION PV = nRT.
(iii) Real gases do not obey gas equation. PV = nRT.
(iv) The DEVIATION of reaf gases from ideal behaviour is measure in terms of a ratio of PV to nRT. This is termed as compression factor (Z). `Z= (PV)/(nRT)`
Discussion
21.

Which of the following is the strongest acid ?

Answer»

`CH_(3)underset(F)underset(|)(C)HCOOH`
`Funderset(F)underset(|)(C)HCH_(2)COOH`
`CH_(3)CH_(2)COOH`
`underset(F)underset(|)(C)H_(2) - underset(F)underset(|)(C)H - COOH`

Solution :`underset(F)underset(|)(CH_(2)) - underset(F)underset(|)(CH) - COOH`
Discussion
22.

Which of the following statements regarding Be is /are true? (I) It forms covalent compounds almost exclusivlty , evan with the highly eletronegative elements (II) It does not form ionic compounds containing simple Ber^(+) ion , but does readily acheve a maximum coordination mumberof fopur through formation of complex ions such as and BeF_(4)^(2-)[Be(H_(2)))_(4)]^(2+). (III) it forms a series of organo derivatives BeR_(2) and [BeR_(3)],which contain covalent Be-C bonds. (IV) Its halides are covalent polymers that are readilty hyrolysed or cleaved by donors.

Answer»

All are correct
I,II & IV only
I,III &iv only
I,ii,&iii only

Answer :2
Discussion
23.

Which of the following name is correct :-

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4-Isopropyl-3-methylhexane
2-Ethyl-3-isopropyl pentane
3-Isopropyl-4-methyl HEXANE
3-Ethyl-2,4-dimethyl hexane

Answer :D
Discussion
24.

The salt solution NH_4OH and HCl is acidic basic or neutral ?

Answer»

SOLUTION :ACIDIC
Discussion
25.

The schrodinger wave equation for hydrogen atom is Psi_2 = (1)/(4sqrt(2pi))((1)/(a_0))^(3//2) (2-(r)/(a_0))e^(-r//a_0) where a_0 is Bohr.s radius. If the radial node in 2s be at r_0 would be equal to

Answer»

`(a_0)/(2)`
`2a_0`
`sqrt2 a_0`
`(a_0)/(sqrt2)`

Solution :At RADIAL NODE `varphi^2 = 0,2 - R/(a_0) =0 , r=2a_0`
Discussion
26.

Which is/are correct statement?

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No corrosion takes PLACE in vaccum
Corrosion is PROTECTED by electroplating
During RUSTING `Fe_2O_3*xH_2O` formed
In presence of electrolyte, corrosion takes place with GREATER rate

Answer :A::B::C::D
Discussion
27.

What is hydride gap ?

Answer»

Solution :The REGION of the periodic table from groups 7-9 which does not FORMHYDRIDES is called the hydride GAP.
Discussion
28.

What is the relation of positive ion with their parent atom ?

Answer»

DOUBLE
Small
Half
High

Answer :B
Discussion
29.

Which indicator should preferably be used for titration of NH_(4)OHwith HCl solution?

Answer»

SOLUTION :METHYL ORANGE.
Discussion
30.

Which of the following can exist in three geometrical isomeric forms?

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Solution :N= even with symmetry
no. of GEOMETRICAL isomers = `2^(n-1) + 2^((n-2)/(2))`
For b,c , No. of geometrical isomers = 3
Discussion
31.

Which of the following pairs of transition metal ions are the stronger oxidising agents in aqueous solutions ?

Answer»

`V^(2+)andCr^(2+)`
`TI^(2+)andCr^(2+)`
`Mn^(3+)andCo^(3+)`
`V^(2+)andF^(2+)`

SOLUTION :OXIDISING agents are those which oxiside other compounds and get reduced themselves.
`Mn^(3+)andCo^(3+)` can act as a STRONGER oxidising agents because their least oxidation state is +2. So they can get reduced from +3 oxidation state to +2oxidation state hence they act as strong oxidising agents.
Discussion
32.

What is Octet rule ? Briefly explain its significance and limitations.

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SOLUTION :ELEMENT s having 8 electrons in the outermost shell are stable. STABILITY of atoms is explained. Some molecules defy OCTET rule and are still stable.,
Discussion
33.

Which of the following statements about a compound is incorrect ?

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A molecule of a compound has atoms of different elements.
A compound cannot be separated into its CONSTITUENT elements by physical methods of separation.
A compound retains the physical PROPERTIES of its CONSTITUENTS elements.
The RATIOOF atoms of different elements in a compound is fixed.

Solution :Physical and CHEMICAL properties of a compound are different from those of its constituent elements.
Discussion
34.

Which of the following is not correct

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low ionisation potential is a favourable condition for the fonnation of cation
coordination number of Cs in CsCI is 8
IONIC BOND is DIRECTIONAL
ionic COMPOUNDS have high melting POINTS

Answer :C
Discussion
35.

Which of the following conditions is not correct for resonating structures?

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the CONTRIBUTING structure MUST have the same number of UNPAIRED electrons.
the contributing structures should have similar energies.
the resonance hybrid should have higher energy than any of the contributing structure.
none of these

Solution :Correct statement is - the resonance hybrid should have lower energy than any of the contributing structure
Discussion
36.

What is isomerism? Why ?

Answer»

Solution :ISOMERISM of n-alkane in presence of anhydrous `AlCl_(3)` and HCl GAS, because ACCORDING to isomerism more STABLE chain isomer is obtained.
Discussion
37.

What is/are true about resonance ?

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The resonance structures are hypothetical
The UNPAIRED electrons in various RESONATING structures are same
Hybrid structure is most energetic
Hybrid structure is least energetic

ANSWER :A::B::D
Discussion
38.

Which of the following specleshave the sameshape ?

Answer»

`CO_(2)`
`C Cl_(4)`
`O_(3)`
`NO_(2)^(-)`

SOLUTION :`CO_(2)` = liear, `C Cl _(4)`= TETRAHEDRAL, `O_(3)` = bent , ` NO_(2)^(-)` = bent.
Discussion
39.

The substance used as a adsorbentt in the column

Answer»

`Na_(2)O`
`Na_(2)SO_(4)`
`Al_(2)O_(3)`
alum.

Answer :C
Discussion
40.

Write the Born-Haber cycle for NaCl.

Answer»

Solution :
When U= Littice energuy `: Delta H_(s)` = Enthaply of SUBLIMATION,= Enthalpy of ionization, `Delta H_(4)=` enthalpy of dissociatio, `Delta H_(i)=DeltaH_(EA)` enthalpy for ELECTRON affinity. The only one step form formation of NaCl from sodium cholorine is associated with the energy called `Delta H_(f)` = = enthalpy of formation.
`:. Delta H_(f)= U+DeltaH_(s)+DeltaH_(i)+DeltaH_(d)DeltaH_(Ea)`
`:.` Lattice energy `U=DEltaH_(f)=[DeltaH_(s)+DeltaH_(i)+DeltaH_(d)+DeltaH_(Ea)]`
Discussion
41.

What are quantum numbers?

Answer»

SOLUTION :The electron in an atom can be characterized by a set of four quantum numbers, namely principal quantum NUMBER (n), azimuthal quantum number (I), magnetic quantum number (m) and spin quantum number (s).
(ii) When Schrödinger equationis solved for a wave FUNCTION `Psi` the solution CONTAINS the first three quantum numbers n, I and m.
(iii) The FOURTH quantum number arises due to the spinning of the electron about its own axis
Discussion
42.

Which of the following compound(s) on reductive ozonolysis (O_3 / /Zn-H_2O) would produce octane-2,4,5,7- tetraone ?

Answer»




SOLUTION :
Discussion
43.

Which among the following compounds does not show hydrogen bonding?

Answer»

Ammonia
Ethyl alcohol
Acetic acid
Diethyl ether

Answer :D
Discussion
44.

underset(("Hydrated salt"))((A))underset("heated")overset("Strongly")rarr ubrace(B+C)_("Transparent glassy bead") H_(2)BO_(3) overset("Strongly")underset("heated")rarr C+D How many X-O-X linkages are present in structure of A(X = central atom)?

Answer»

4
3
5
2

Answer :C
Discussion
45.

Which of the following oxides is acidic in nature ?

Answer»

`B_2O_3`
`Al_2O_3`
`Ga_2O_3`
`In_2O_3`

Solution :In group 13 (boron FAMILY) on moving down the group, ACIDIC CHARACTER DECREASES and basic character increases, therefore, `B_2O_3` is acidic in nature.
`underset"Acidic"(B_2O_3)""underset"Amphoteric" (Al_2O_3 " and " Ga_2O_3) "" underset"Basic"(In_2O_3" and " Tl_2O_3)`
Discussion
46.

Which of the following relates to photons both as wave motion and as a stream of particles

Answer»

Interference
`E = mc^(2)`
Diffraction
`E = HV`

ANSWER :D
Discussion
47.

underset(("Hydrated salt"))((A))underset("heated")overset("Strongly")rarr ubrace(B+C)_("Transparent glassy bead") H_(2)BO_(3) overset("Strongly")underset("heated")rarr C+D Find the number of tetrahedral and trigonal planar units in structure of A:

Answer»

2,1
2,2
2,4
5,2

Answer :B
Discussion
48.

When you freeze water in your freezer to make ice cubes,the amount of order in the molecules ofwater increases. However , second law of thermodynamics says that the amountof order in the isolated system can only stay constant or decrease with time. How can thus making of iceviolate second law ?

Answer»

because water expands during ice formation
becauseice formation takes place at `0^(@)C`
because ice issolid
because ice cubes do not CONSTITUTE isolated SYSTEM.

SOLUTION :The statement of sound lawis applicable only to isolated system but ice cubes in the freezer do not constitue isolated system.
Discussion
49.

underset(("Hydrated salt"))((A))underset("heated")overset("Strongly")rarr ubrace(B+C)_("Transparent glassy bead") H_(2)BO_(3) overset("Strongly")underset("heated")rarr C+D Identify C :

Answer»

`(BN)_(X)`
`NaPO_(3)`
`B_(2)O_(5)`
`Mg(NH_(4))PO_(4)`

Answer :C
Discussion
50.

Uup means having atomic number of element is…..

Answer»

105
113
115
103

Answer :C
Discussion