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 properties of hydrogen are responsible for moderation of the climate and body temperature of living beings?

Answer»

High heat of vapourisation
High heat capacity
both (a) and (B)
NONE of these

Answer :C
Discussion
2.

Writenoteson geometrical isomerism or cis iruns isomerism

Answer»

Solution :(i)it isa TYPEOF stereoisomerismit is alos calledcis -transisomerism . Such typeofboundedcarbonatoms.
(II)if thesimilargrouplieon the samesidethen the geometricalisomersare CALLEDAS CIS- isomers

(iii)if thesimilargrouplieon theoppositesidethen thegeometricalisomersare calledastrans - isomers
Discussion
3.

Which of the following on hydrolysis with dilute alkali following by acidification gives benzaldehyde.

Answer»

Benzotrichloride
Benzal chloride
Benzyl chloride
P-chlorotoluene

Answer :2
Discussion
4.

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

Answer»

Solution :When an aqueous solution of borax is acidified with HCL boric acid is formed
`Na_(2)B_(4)O_(7)+2HCl+5H_(2)Orarr2NaCl+underset("Boric acid")(4H_(3)BO_(3))`
Boric acid is a white crystalline solid. It is soapy to touch because of its planar layered structure. Boric acid is a weak monobasic acid. It is not a protonic acid but ACTS as a Lewis acid by accepting electrons from a hydroxyl ion
`B(OH)_(3)+2HOHrarr[B(OH)_(4)]^(-)+H_(3)O^(+)`.
Discussion
5.

Write the correct increasing order in chemical reactivity in terms of oxidizing property for N, O, F and Cl.

Answer»


ANSWER :`N LT O lt CL lt F`
Discussion
6.

The type of hybridisation present on "S" in SO_2 and SO_3molecules respectively

Answer»

`SP,sp^(2)`
`sp^(2),sp^(2)`
`sp,sp^(3)`
`sp^(2),sp^(3)`

ANSWER :B
Discussion
7.

Which of the following statement is true.

Answer»

7 – BROMO cycloheptatriene (tropylium bromide) completely dissosciate in water to form `Br^(-)` ion
Cyclooctatetraene is NON – AROMATIC which its corresponding dianion is aromatic.
Both a and B
Neither is true

Solution :
Discussion
8.

Which of the following statements regarding 2-butene is / are right

Answer»

It EXISTS in two geometrical ISOMERS
The two geometrical isomers have DIFFERENT boiling points
Hydrogenation is presence of NI GIVES same alkane
The two geometrical isomers are diastereoisemers

Solution :A) It exists in two geometrical isomers
B) The two geometrical isomers have different boiling points
C) Hydrogenation is presence of Ni gives same alkane
D) The two geometrical isomers are diastereoisemers
Discussion
9.

Which of the following processes involves absorption of energy?

Answer»

`Cl_((G))+e^(-)toCl_((g))^(-)`
`O_((g))^(-)+e^(-)toO_((g))^(-)`
`O_((g))+e^(-)toO_((g))^(-)`
`S_((g))+e^(-)toS_((g))^(-)`

ANSWER :b
Discussion
10.

Which of the following principles/rules limits the maximum number of electrons in an orbital to two

Answer»

Aufbau's principle
pauli's exclusion principle
HUND's RULE of maximum multiplicity
Heisenberg uncertainty principle

SOLUTION :No two electrons in an atom can have IDENTICAL set of all the four quantum NUMBERS.
Discussion
11.

Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances ?

Answer»




SOLUTION :In (d), equal number of ELECTORNS are ALIGNED in OPPOSITE DIRECTION.
Discussion
12.

Which of the following statements are correct ?

Answer»

According to Bronsted Lowry CONCEPT, `H_(2)SO_(4)` can also act as a BASE
`SiF_(4)` is an acid according to Lewisconcept
Stronger the acid, higher is its `pK_(a)` value
HCl, `HNO_(3) and H_(2)SO_(4)` act as equally strong acids in any solvent.

Solution :(a) is correct because in presence of `HClO_(4)`,`H_(2)SO_(4)` can accept a proton and hence can act as a base.
(B) SI has empty d-orbitals to accept electrons.
Hence, Si`F_(4)` is a Lewis acid.
Discussion
13.

The shortest wavelength in hydrogen spectrum of Lyman series when R_(H) = 109678 cm^(-1) is

Answer»

`1002.7 Å`
`1215.67 Å`
`1127.30 Å`
`911.7 Å`

Solution :`bar(v) = (1)/(lamda) = R_(H) ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))`
For LYMAN series, `n_(1) = 1`
`lamda` is shortest of `1//lamda` is largest when `n_(1) = oo` Hence,
`(1)/(lamda) = 109678 ((1)/(1^(2))) = 109678 CM^(-1)`
or `lamda = (1)/(109678) cm = 911.7 xx 10^(-8) cm = 911.7 Å`
Discussion
14.

what is the effect of pressure on NaCl type crystals ?

Answer»

Solution : On increasing pressure , the COORDINATION number of NaCL type ctystals incrases from 6: 6 to 8 : 8/
Discussion
15.

Which alkane is produced when sodium salt of butanoic acid is heated with soda lime?

Answer»

`CH_(3)CH_(3)`
`CH_(3)CH_(2)CH_(2)CH_(3)`
`CH_(4)`
`CH_(3)CH_(2)CH_(3)`

Solution :`underset("Sodium butanoate")(CH_(3)CH_(2)CH_(2)C) overset(-)(O)Na^(+)+NaOH underset(DELTA)overset(CAO)to Na_(2)CO_(3)+ underset("PROPANE")(CH_(3)CH_(2)CH_(3))`
Discussion
16.

What is the temperature range of the atmosphere ?

Answer»

SOLUTION :`-56^@ C` to `1200^@ C`
Discussion
17.

What is the SI unit of mass ? How is it defined ?

Answer»



Solution :The SI unit of mass is KILOGRAM. It is EQUAL to weight of `UL("internation (d units.)")`
Discussion
18.

Tritium nucleus contains

Answer»

1p+0n
2p+In
1p+2n
none of these

Solution :`"_(1)T^(3)(1E^(-),1p,2n)`
Discussion
19.

Which is the longest group of the long form of the periodic table? How many elements are present in it?

Answer»

Solution :The LONGEST group in the periodic table is group IIIB (Group 3 in IUPAC notation). There are 32 ELEMENTS in group 3.
Discussion
20.

Which of the following statement is(are) correct?

Answer»

`H_(2)O` is a PALE blue viscous LIQUID
`H_(2)O_(2)` can ACT as an oxidizing as well as a reducing agent
In `H_(2)O_(2)` the two hydroxyl GROUPS lie on the same phase
None of these

Answer :A::B
Discussion
21.

Which molecule among the following has both polar nad non-polar covalent bond ?

Answer»

`NH_(4)^(+)`
`H_(2)O_(2)`
`HCl`
`CH_(4)`

ANSWER :B
Discussion
22.

What is saturated vapour pressure ?

Answer»

Solution :At CONSTANT temperature, and evacuated container is partially filled with liquid, after some time it becomes constant, an EQUILIBRIUM is established between liquid phase and VAPOUR pressure, vapoure pressure at this stage is known as equilibrium vapour pressure or SATURATED vapour pressure.
Discussion
23.

The region of the atmosphere lying upto 11 km from earth's surface is called whereas that lying above it upto 50 km is called _____________

Answer»


ANSWER :TROPOSPHERE, STRATOSPHERE
Discussion
24.

The reductive ozonolysis of an alkene gave butanone and ethanal. Give the structure of alkene and its IUPAC name.

Answer»

Solution :Write the structures of the PRODUCTS with carbonyl groups facing each other.
`UNDERSET("Ethanal")(CH_(3)-CH)=O+Ounderset("Butanone")(=overset(CH_(3))overset(|)C-)CH_(2)CH_(3)to`
Ethana! Butanone Remove OXYGENS and put the double bond between the carbonyl carbons to get alkene
`{:(""CH_(3)),("|"),(CH_(3)-CH=C-CH_(2)CH_(3)),("3-Methylpent-2-ene"):}`
Discussion
25.

The values of coefficients to balance the following reaction are Cr(OH)_(3)+ClO^(-)+OH^(-) rarr CrO_(4)^(2-)+Cl^(-)+H_(2)O

Answer»

`{:(CR(OH)_(3),CLO^(-),CrO_(4)^(2-),CL^(-)),("2","3","3","3"):}`
`{:(Cr(OH)_(3),ClO^(-),CrO_(4)^(2-),Cl^(-)),("2","4","3","2"):}`
`{:(Cr(OH)_(3),ClO^(-),CrO_(4)^(2-),Cl^(-)),("2","4","4","2"):}`
`{:(Cr(OH)_(3),ClO^(-),CrO_(4)^(2-),Cl^(-)),("2","3","2","3"):}`

Solution :`{:(Cr(OH)_(3)+5OH^(-)rarrCrO_(4)^(2-)+4H_(2)O+3e^(-)"]"xx2),(ClO^(-)+H_(2)O+2e^(-)RARR Cl^(-)+2OH^(-)"]"xx3):}/ul(2Cr(OH)_(3)+4OH^(-)+3ClO^(-)rarr2CrO_(4)^(2-)+3Cl^(-)+5H_(2)O)`
Discussion
26.

Vanderwaal's constants for hydrogen chloride gas are a = 3.67 atm lit^(-2) and b = 40.8 ml mol^(-1). Find the critical temperature and critical pressure of the gas.

Answer»

Solution :`T_(c) = (8a)/(27 RB)`
`= (8 xx 3.67 )/(27 xx 0.0821 xx 0.0408) = 324.7` K
`= 51.7^(@) C`
`P_(c) = (a)/(27 B^(2)) = (3.67)/(27 xx (0.0408)^(2)))`
`= 81.6` atm
Discussion
27.

Which one of the following pair is called an ideal solution ?

Answer»

1) nicotine-water
2) water -ether
3) water-alcohol
4) Chlorobenzene-bromobenzene

Answer :D
Discussion
28.

Write the relationship between K_(sp) and S of PbI_(2).

Answer»

Solution :`PbI_(2)` belongs to `AB_(2)` type of salt.
`PbI_(2)hArrPb^(2+)+2I^(-)`
`[Pb^(2+)]=S" mol "dm^(-3)and[I^(-)]=2S" mol "dm^(-3)`
`K_(sp)=[Pb^(2+)][I^(-)]=(S)*(2S)^(2)`
`thereforeK_(sp)=4S^(3)`.
Discussion
29.

What is the value of electron gain enthalpy of Na^+ if IE_1 of Na=5.1 eV

Answer»

`+2.55` eV
`+10.2` eV
`-5.1` eV
`-10.2` eV

Solution :`IE_1` of Na = - Electron GIVEN ENTHALPY of `Na^+` =-5.1 VOLT.
Discussion
30.

Which one is not aromatic compound ?

Answer»




ANSWER :D
Discussion
31.

The thickness of window panes of old buildings is more at the bottom than at the top, which is due to

Answer»

Surface tension of GLASS
Viscosity of glass
Expansion of solid as a GIVEN temperature
Expansion of LIQUID at a given temperature

Solution :Glass is SUPERCOOLED liquid and FLOWS .
Discussion
32.

What happens when Boric acid is added to water

Answer»


ANSWER :`H_3BO_3+H_2Orarr[B(OH)_4]^-+H^+`
Discussion
33.

Which among of the following has same kinetic energy as O_(2) gas at NTP ?

Answer»

`H_(2)`
`N_(2)`
`CO_(2)`
None of these

Answer :A::B::C
Discussion
34.

What is the catalyst used in the following reaction? 2CH_(3)Cl+Sioverset("Catalyst")underset(570K)rarr (CH_(3))_(2)SiCl_(2)

Answer»

NICKEL POWDER 
COPPER powder 
Zinc powder 
Platinum powder

Answer :B
Discussion
35.

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions : (a) K and S (b) Ca and O (c)Al and N .

Answer»

SOLUTION :
Discussion
36.

The weight of oxygen required to completely react with 27gof Al is

Answer»

8g
16g
32g
24g

Answer :D
Discussion
37.

Which bond is more polar in the following pairs of molecules (a) H_(3)C- H, H_(3)C- Br (b) H_(3)C- NH_(2), H_(3)C-OH (c ) H_(3)C- OH, H_(3)C- SH

Answer»

Solution :(a) C-Br bond is more polar than C-H. Because the electronegativity of Br is more than H.
(B) C-O bond is more polar than C-N. Because the electronegativity of O is more than N.
(c ) Bond POLARITY of C-O bond is more than C-S bond, Because the electronegativity of S is less.
Electronegativity in period is increase.
`((H),(2.1))((C),(2.5))((N),(3.0))((O),(3.5)) ((F),(4.0))`
Electronegativity in GROUP is decrease. `(N gt P gt "As"), (O gt S gt Se), (F gt Cl gt Br)`
The extend of bond polarity `prop` deference of electronegativity. `C - H lt C-N lt C-O lt C-F`
`C- H lt C- O lt C-F lt C-Cl`
`C- H lt C- S lt C - O lt C - F`
`rarr` Increase polarity of bond `rarr`
Discussion
38.

Write the chemical formulae of the following: Quick lime, slaked lime, milk of lime, lime water.

Answer»

SOLUTION :`CAO, CA(OH)_2, Ca(OH)_2, Ca(OH)_2`
Discussion
39.

Which compound is predominantly formed when phenol is allowed to react with bromine in aqueous medium?

Answer»

PICRIC ACID
SALICYLIC acid
2,4,6-Tribromophenol
p-Bromophenol

Solution :2,4,6-Tribromophenol.
Discussion
40.

Which one of the following statement is not true ?

Answer»

pH of drinking water should be between5.5-9.5.
Concentration of DO below 6 ppm is good for 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.

Solution :The ideal value of D.O for growth of fishes is 8 mg/l. 7mg l is desirable RANGE, below this value fishes get susceptible to desease. A value of 2 mg/l or below is lethal for fishes.
Discussion
41.

Which of the following anionic radicals give white precipitate with magnesium nitrate reagent or magnesia mixture?

Answer»

`HPO_(4)^(2-)`
`CO_(3)^(2-)`
`CH_(3)COO^(-)`
`NO_(3)^(-)`

ANSWER :A
Discussion
42.

Total number of alkyl groups having the molecular formula C_(4)H_(9) is

Answer»


SOLUTION :FOUR, i.e., n-butyl,ISOBUTYL, sec-butyl and tert-butyl.
Discussion
43.

Whenever a reaction between an oxidising agent and a reducing agent is carried out, a compound of lower oxidation state is formed if the reducing agent is in excess and a compound of higher oxidation state is formed if the oxidising agent is in excess. Justify this statement giving three illustrations.

Answer»

Solution :The given statement can be verified by the FOLLOWING illustrations :
(a) `UNDERSET(("reducing AGENT Excess"))(2C(s))+underset(("oxidising agent"))(O_(2)(g))tounderset(("Compound of lower O.S."))overset(+2)(2CO(g))""......(i)`
`underset(("reducing agent"))(C(s))+underset(("oxidising angent Excess"))(O_(2)(g))tounderset(("Compound of higher O.S."))overset(+4)(CO_(2)(g))""......(ii)`
In REACTION (i), the reducing agent, i.e., carbon is in excess, whereas in reaction (ii) the oxidising agent, i.e., `O_(2)` is in excess. Reaction (i) leads to the formation of CO (O.S. of C = + 2), while reaction (ii) leads to the formation of `CO_(2)` (O.S. of C=+4)
(b) `underset(("reducing agent Excess"))(4Na(s))+underset(("oxidising agent"))(O_(2)(g))tounderset(("Compound of lower O.S."))(Na_(2)overset(-2)(O)(s))""......(i)`
`underset(("reducing agent"))(2Na(s))+underset(("oxidising agent Excess"))(2O_(2)(g))tounderset(("Compound of higher O.S."))(Na_(2)overset(-1)(O_(2))(g))"".......(ii)`
(c ) `underset(("reducing agent Excess"))(P_(4)(s))+underset(("oxidising agent"))(6Cl_(2)(g))tounderset("Compound of lower O.S.")(4overset(+3)(P)Cl_(3)(l))"".......(ii)`
`underset(("reducing agent"))(P_(4)(s))+underset(("oxidising agent Excess"))(10Cl_(2)(g))tounderset("Compound or higher O.S.")(4overset(+5)(P)Cl_(5)(s))""........(ii)`
Discussion
44.

What is the shape of anionic part of (C)?

Answer»

TRIGONAL planar
Tetrahedral
TBP
Square planar

Answer :B
Discussion
45.

Which one of the following reagents is used for detection of unsaturation in alkenes?

Answer»

`NaOH+CaO`
Cold DILUTE alkaline `KMnO_(4)`
`Cl_(2)//hupsilon`
`KOH//C_(2)H_(5)OH`

Answer :B
Discussion
46.

Which of the following statements about H_(2)O_(2) a true?

Answer»

`H_2O_2` is USED oil paintings
`H_2O_2` act as oxidising as well as REDUCING agent
Two hydroxyl groups in `H_2O_2` LIE in the same plane
It retains same structure in LIQUID and solid form

Solution :THOUGHT it has open book structure, bond lengths and dihedral angles are different
Discussion
47.

Which of the following is not a periodic property?

Answer»

ATOMIC radius
Ionization enthalpy
Electron afinity
 OXIDATION number

Answer :D
Discussion
48.

Which of the following reagents can be used to differentiate between Ph-underset(O)underset(||)(C)-H and CH_(3)CH_(2)OH?

Answer»

NaOI
Fehling's solution
Tollen's reagent
`ZnCl_(2)//H`

ANSWER :A::B
Discussion
49.

The value ofK_(p)" for the reaction ", CO_(2) (g) + C (s) hArr2 CO (g),is 3.0at 1000 K. Initially , p_(co_(2)) = 0.48" bar "and P_(CO)= 0 bar and opure graphite is present , calculate the equilibrium partial pressures of CO and CO_(2)

Answer»

Solution :`{:(,CO_(2)(g) + C(s),hArr,2 CO (g)),("INTIAL",0.48 " bar ",,0 "bar"),("AT.eqm.",(0.48-p)"bar",,2" p bar"):}`
` K_(p) = (2 p)^(2)/(0.48-p )=3.0 " (Given) ".`
` :. 4 p^(2) = 1.44 - 3 p or 4 p^(2) + 3 p - 1.44=0`
` :.p = ( -b pm sqrt(b^(2) - 4 ac))/(2a)=(-3 pm sqrt ( 9-4 xx 4 ( - 1. 44)))/8`
` = ( -3 pm sqrt(32*04))/8= (-3 pm 5.66)/8 = 2.66/8 ""` (neglecting - ve value)
= 0.33 ATM
`:. p_(CO_(2))= 0.48 - 0.33 = 0.15 " bar" , p_(CO_(2)) = 2 xx 0.33 = 0. 66 " bar " `
Discussion
50.

What volume of water should be added to 50 mL M/5 HCI solution to make it decimolar?

Answer»


Solution :The number of gram MOLES in 50 mL `M/5`HCI.
`=(1/5 XX 50)/1000 =0.01` (No. of gram moles `=(M xx V)/1000`)
Suppose, v mL of water should be added to make it decimolar.
The total volume will now be = 50 + v mL.
Number of gram moles of HCI in this DILUTED solution
`=(1/10 xx (50 + v))/1000`
The two gram moles should be equal. THEREFORE,
`=(1/10 xx (50 + v))/1000 = 0.01`
which gives v=50 mL
HENCE, 50 mL of water should be added to 50 mL `M/5` HCI to make it decimolar.
Discussion