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.

Use the data given below to find the type of cubic lattice to which the crystal of iron belongs a/pm=286 , rho//g cm^(-3)=7.86

Answer»


SOLUTION :CALCULATE Z (Z=2 MEANS BCC)
Discussion
2.

The test for unsaturations is confirmed by the decolourisation of which of the following.

Answer»

Iodine water
`CuSO_(4)` SOLUTION
Bromie water
All of these

Solution :By adding bromine water to a solution,if the COLOUR of bromine water decolourise then the COMPOUND is UNSATURATED. This is a confirmatory test for unsaturations.
Discussion
3.

What will be the spontaneous reaction between the following half cell reactions ? (i) Cr^(3+)(aq)+3e^(-) rarr Cr(s) ""E^@=-0.74V (ii) MnO_2(s)+4H^(+)+2e^(-)rarr Mn^(2+)(aq)+2H_2O(l)""E^@=1.28V Calculate E_("cell")^@

Answer»

Solution : Since the reduction POTENTIAL REACTION (ii) is more than that of reaction (i), reaction (ii) will occur as reduction . Therefore , reaction (i) should be written as oxidation . To obtain the net reaction , we multiply by appropriate COEFFICIENTS so that electrons get cancelled .
`MnO_2(s)+4H^(+)(AQ)_+2E^(-)rarrMn^(2+)(aq)+2H_2O(l)]xx3`
`""Cr(s)rarrCr^(3+)(aq)+3e^(-)]xx2`
`2Cr(s)+3MnO_2(s)+12H^(+)(aq)rarr2Cr^(3+)(aq)+3Mn^(2+)(aq)+6H_2O`
`E_("cell")^@=E_("Substance reduced")-E_("Substance oxidised")`
`=1.28-(-0.74)=2.02V`
Discussion
4.

Wurtz fitting reaction helps to prepare ……….compound

Answer»

SOLUTION :AROMATIC
Discussion
5.

Which is soluble both in water and acetone?

Answer»

LiF
LiCl
both (a) and (B)
NONE of these

Solution :N//A
Discussion
6.

The temporary hardness of water due to calcium bicarbonate can be removed by adding

Answer»

`CaCO_(3)`
`CaCI_(2)`
HCI
`CA(OH)_(2)`

SOLUTION :`Ca(HCO_(3))_(2)+Ca(OH)_(2)to underset("(Insoluble)")(2CaCO_(3))+2H_(2)O`
Discussion
7.

The weight of 350 ml of a diatomic gas is 1 gram at 0^@C and 2 atm. pressure. The weight of one atom in grams is

Answer»

`32/N`
`16/N XX 1/2` 
`2.66 xx 10^(-23)`
`5.33 xx 10^(-23)`

ANSWER :C
Discussion
8.

Which doesn't cause coagulation of colloidal solution ?

Answer»

Filtration
Nonelectrolyte
Electrolyte
All.

Solution :NONELECTROLYTES cannot CAUSE COAGULATION.
Discussion
9.

Write Gibb's equation

Answer»


ANSWER :`DeltaG=Delta H-TDeltaS`
Discussion
10.

The triple point of CO_(2) occurs at 5.1 atm and -56^(@)C. Its critical temperature is 31^(@)C. Solid CO_(2) is more dense than liquid CO_(2). Under which combination of pressure and temperature is liquid CO_(2) stable at equilibrium?

Answer»

10 atm and `-25^(@)C`
`5.1` atm and `-25^(@)C`
10 atm `33^(@)C`
`5.1` atm and `-100^(@)C`

ANSWER :A
Discussion
11.

Which quantity out of Delta_(r)G andDelta_(r)G^(c-) will be zero at equilibrium ?

Answer»

Solution :`Delta_(R)G= Delta_(r)G^(@) + RT LN K`. When reaction attains EQUILIBRIUM`Delta_(r) G=0` so that`Delta_(r)G^(@)=- RT` ln K . Thus `Delta_(r)G^(@) =0` only when `K+1` . For all other VALUES of `K, Delta_(r)G^(@) ` will be non-zero.
Discussion
12.

Tritium, ._(1)T^(3)(an isotope of H) combine wityh flurine to form a weakacid TF whch ionises to give T^(+) prepared dilute aquios solution of TF has a pt (euivalentof pH) fo 1.7 and frezze at - 0.372^(@)C. If 600mL of freshly prapared soltuion were allowed to stand for 24.8 years, calculate: (i() Ionisation constation of TE (ii) Charge carried by beta- particles emitted by tritium in faraday. Given: K_(f) for H_(2)O = 1.86, t_(1//2) (T) = 12.4yrs.

Answer»


ANSWER :(i) `2.5xx10^(-3)`, (II) `0.054` FARADAY
Discussion
13.

Which of the following is not the configuration of lanthanoid

Answer»

`[Xe]4f^(10).6s^(2)`
`[Xe]4f^(1)5d^(1).6s^(2)`
`[Xe]4f^(14)5d^(10)6s^(1)`
`[Xe]4f^(7)5d^(1)6s^(2)`

Answer :C
Discussion
14.

Which of the following compounds exhibits geometrical isomerism? underset((i))(CH_(2)=CHCH_(3))underset((ii))(CH_(3)CH=CHCH_(3)) underset((iii))(CH_(3)CH=C)=CHCH_(3)underset((iv))(CH_(3)CH=C=C=CHCH_(3))

Answer»

(ii), (iv)
(ii), (iii) and (iv)
(ii), (iii)
(i), (iii)

SOLUTION :double BONDED CARBONS with different groups
Discussion
15.

What is electron gain enthalpy (Delta_(eg)H) ? When its value becomes positive and negative ?

Answer»

Solution :When an electron is added to a neutral gaseous atom (X) to convert it into a negative ion, the enthalpy change accompanying the process is defined as the .Electron Gain Enthalpy `(Delta_(eg) H)`..
Electron gain enthalpy provides a measure of the ease with which an atom adds an electron to form anion as REPRESENTED by EQUATION.
`X_(Gg) + e^(-) to X_((g))^(-) : Delta_(eg) H `

Depending on the element, the process of adding an electron to the atom can be either endothermic or exothermic.
For many elements energy is released when an electron is added to the atom and the electron gain enthalpy is negative.
For example, group 17 elements (the halogens) have very high negative electron gain enthalpies because they can attain stable noble gas electronic configurations by PICKING up an electron.
On the other hand, noble GASES have LARGE positive electron gain enthalpies because the electron has to enter the next higher principal quantum level leading to a very unstable electronic configuration.
It may be noted that electron gain enthalpies have large negative values toward the upper right of the periodic table preceding the noble gases.
Discussion
16.

Which of the following has a regular geometry ?

Answer»

`CHCl_(3)`
`PCl_(3)`
`XeF_(6)`
`SF_(4)`

SOLUTION :`CHCl_(3)` = tetrahedral ,""`PCl_(3) ` = pyramidal
`XeF_(6)` tetrahedral octahedral
`SF_(4)` = DISTORTED TRIGONAL bipyramidal .
Discussion
17.

What do you understand by the term .auto protolysis. of water ? What is its significance ?

Answer»

Solution :The auto-protolysis (self-ionization) of WATER takes place as follows:
`{:(H_2O_((l))+, H_2O_((l)) hArr , H_3O_((AQ))^(+)+, OH_((aq))^(-)),("acid-1", "base-2","acid-2","base-1"),("(acid)","(base)","(conjugate acid)","(conjugate base)"):}`
(ii) REDOX Reactions Involving Water : Water can be easily reduced to dihydrogen by highly ELECTROPOSITIVE metals.
`2H_2O_((l)) + 2Na_((S)) to 2NaOH_((aq))+ H_(2(g))`
Thus, it is a great source of dihydrogen. Water is oxidised to `O_2` during photosynthesis.
`6CO_(2(g)) + 12H_2O_((l)) to C_6H_12O_(6(aq)) + 6H_2O_((l)) + 6O_(2(g))`
Withfluorine also it is oxidised to `O_2`
`2F_(2(g)) + 2H_2O_((l)) to 4H_((aq))^(+) + 4F_((aq))^(-) + O_(2(g))`
Discussion
18.

Which of the following graphs is incorrect?

Answer»




ANSWER :D
Discussion
19.

Which point defects in crystals of a solid does not change the density of the solid ?

Answer»

SOLUTION :FRENKEL DEFECT
Discussion
20.

What will be the change in valency down the group in the periodic table?

Answer»

INCREASES
DECREASES
REMAINS same
zero

Answer :C
Discussion
21.

Which one is natural fertilizer ?

Answer»

Rhizobium
Azotobacters
Compost
All of these

Solution :All of these
Discussion
22.

What happen when nitrile undergoes acid hydrolysis ?

Answer»

Solution :When alkyl NITRILE undergoes acid HYDROLYSIS to GIVE amide,m which on further hydrolysis to give carboxylic acid.
`underset("(NITRILA)")(R-CN)overset(H^(+)|H_(2)O)(to)R-underset("(Amide)")(CONH_(2))overset(H^(+)|H_(2)O)(to)underset("(carbosylic ackd)")(R-COOH)`
Discussion
23.

The velocity of an electron of mass 9.1xx10^(-31) kg moving round the nucleus in the Bohr orbit (diameter of the orbit is 1.058Ã…) is 2.2xx10^(-6)m sec^(-1). If momentum can be measured within the accuracy of 1%, then calculate uncertainty in position (Deltax) of the electron

Answer»


ANSWER :`2.64xx10^(3)` METRE.
Discussion
24.

What will be the nature of forces at critical conditions for a real gas?

Answer»

Attractive
Repulsive
No NET dominant forces
DEPENDS on the types of the gas, attractive for most of them and repulsive for `H_(2)` and He.

ANSWER :a
Discussion
25.

Which step is used to produce 1-Chloro-3-ethylbenzene

Answer»




ANSWER :A
Discussion
26.

What is relation between compressibility factor and molar volume.

Answer»

SOLUTION :`Z=(V_("REAL"))/(V_("IDEAL"))`
Discussion
27.

When the oxidation number of an element is maximum it can act only as………………

Answer»


ANSWER :an OXIDISING AGENT
Discussion
28.

Which of the following carbocation is most stable ? (CH_(3))_(2)CH-overset(+)(C)HCH_(3) and (CH_(3))_(2)overset(+)(C)-CH_(2)CH_(3)

Answer»

SOLUTION :`(CH_(3))_(2)OVERSET(+)(C)CH_(2)CH_(3)` is most stable , because it can FORM `3^(@)`-carbocation.
Discussion
29.

When an electron adds on F atom, It becomes __________

Answer»

It acts as a REDUCING agent
It LOSES electrons
Its ionic radius BECOMES larger
It accepts electrons

Answer :C
Discussion
30.

Which of the following compounds will notundergo friedal crafts reactioneasily?

Answer»

nitrobenzeen
TOLUENE
CUMENE
XYLENE

ANSWER :a
Discussion
31.

The tendency of alkali metal cations to undergo hydration............ in going from Li^(+) " to " Cs^(+).

Answer»

SOLUTION :DECREASES
Discussion
32.

The two ions A^(+) and B^(-) have radii 88 and 200 pm respectively. In the close packed crystal of compound AB, predict the corrdination number of A^(+) .

Answer»

Solution :`(r_(+))/(r_(-)) = (R(A^(+)))/(r(B^(-)))= (88"PM")/(200"pm") = 0.44`
It lies in the range0.414 to 0.732
HENCE, the cordination number of ` A^(+) = 6`
Discussion
33.

Which of the following compound is produced when alpha-chloroacetic acid is heated with Ag powder ?

Answer»

Acetic acid
Acetone
Succinic acid
Maleic acid

Solution :`{:(""O),("||"""CH_(2)-COOH),(2Cl-CH_(2)-C-OH+Ag UNDERSET(-2AgCl)overset(DELTA)(RARR)"|"),(""alpha-"Chloroacetic acid"""CH_(2)-COOH),("Succinic acid"):}`
Discussion
34.

Which of the following statements are false regarding BeCl_(2)

Answer»

In SOLID state, `BeCl_(2)` exits in the form of linear structure
In vapour state it exits as a TRIMER with bridged structure
Below `1200K` it has cyclic structure
Invapour state is exits as a solid with bridged structure

Solution :In solid state `BeCl_(2)` has a polymeric structure `BeCl_(2)` exists as a DIMER in vapour state It exists as a monomer at `1200K`
Discussion
35.

Which one of the alkaline earth metal carbonates is thermally the most stable ?

Answer»

`MgCO_3`
`CaCO_3`
`SrCO_3`
`BaCO_3`

Solution :The THERMAL stability of CARBONATES INCREASES with increase in the electropositive CHARACTER of metals.
Discussion
36.

Why an ionic bond is formed between two elements having large difference in their electrongativity?

Answer»

Solution :The more electronegative element will attract the shared pair of electrons to such a large EXTENT extent than the
other that it will amount to transfer of electron RESULTING in the FORMATION of ions .
Discussion
37.

The solubility product of BaSO_(4) at 18^(0) C is 1.5xx10^(-9) . It solubility (mole lit^(-1)) at the same temperature is

Answer»

`1.5 XX 10^(-9) `
` 1.5 xx 10^(-5)`
` 3.9 xx 10^(-9)`
` 3.9 xx 10^(-5)`

Solution :` K_(SP)=1.5 xx 10 ^(-9) `
`S = sqrt( K_(sp) ) = sqrt( 1.5 xx 10 ^(-9) )= 3.9 xx 10 ^(-5) M`
Discussion
38.

Treatment of phenol with acetyl chloride produces

Answer»

METHYL benzoate
Phenyl acetate
Phenoline
Phenetole

Solution :
Discussion
39.

Who developedquantummechanics ?

Answer»

SOLUTION :Quantummechanicswasdevelopedindependentyin 1926 byWernerHeisenbergand ErwinSchrodinger .
Discussion
40.

Which one of the following pairs do not impart colour to the flame?

Answer»

`BeCl_(2) and SrCl_(2)`
`BeCl_(2) and MgCl_(2)`
`CaCl_(2) and BaCl_(2)`
`BaCl_(2) and SrCl_(2)`

Answer :B
Discussion
41.

Write the products of following reactions (a) CH_(3)-C-=N overset(H_(3)O^(-))rarr(b) CH_(3)NC overset(H_(3)O^(+))rarr

Answer»


Answer :(a) `CH_(3)-C -= overset(H_(3)O^(PHI))RARR` (b) `CH_(3)NC overset(H_(3)O^(Phi))rarr CH_(3)-overset(+)(N)H_(3)+HCOOH`
Discussion
42.

What do you understand by the term .auto protolysis. of water? What is its significance ?

Answer»

Solution :Autoprotolysis means self ionisation of water. It may be represented of
`underset("Acid"_1)(H_2O_((l)))+ underset("BASE"_2)(H_2O_((l))) hArr underset("Acid"_2)(H_3O_((aq))^(+)) +underset("Base"_1)(OH_((aq))^(-))`
Due to autөprotolysis, water is amphoteric in NATURE. i.e. it reacts with both acids and BASES. If acts as a base towards acids stronger than itself and as an acid towards base stronger then itself. For example:
`underset("Acid"_1)(H_2O_((l)))+ underset("Base"_2)(NH_(3(aq))) to underset("Acid"_2)(NH_(4(aq))^(+)) +underset("Base"_1)(OH_((aq))^(-))`
`underset("Base"_1)(H_2O_((l)))+ underset("Acid"_2)(H_2S_((aq)))to underset("Acid"_1)(H_3O^(+))+ underset("Base"_2)(HS^-)`
Discussion
43.

What happeas when alkali metals react with halogens?

Answer»

SOLUTION :Alkali metals reacts with HALOGENS vigorously to from metal halides.
`2 M + X_(2) to 2M^(+) X^(-)` (metals HALIDE)
EX: `2Na + CI_(2) (g) overset(Delta)(to) underset("Sodium chloride")(2Na^(+) CI^(-))`
Discussion
44.

The value of carbon-carbon double bond length is ……………………

Answer»

1.43Å
1.20Å
1.54Å
1.33Å

Solution :1.33Å
Discussion
45.

Which of the following structures correspond to the product expected , when excess of C_6H_6 reacts with CH_2Cl_2 in presence of anhydrous AlCl_3.

Answer»




ANSWER :D
Discussion
46.

The uncertainty in the position of a flying dust particle of mass 0.1 mg is found to be 10^(-4)m. The uncertainty in the position of another flying dust particle of mass 0.5 mg is also found to be same The uncertainty in the velocity of the lighter dust particle is nearly

Answer»

`5 xx 10^(-24) ms^(-1)`
`2.5 xx 10^(-24) ms^(-1)`
`1.25 xx 10^(-24) ms^(-1)`
`5 xx 10^(-25) ms^(-1)`

Solution :For lighter DUST PARTICLE of mass, m = 0.1 mg
`Delta x = 10^(-4) m`
`Delta x.(m Delta v) = (H)/(4pi)`
`:. 10^(-4) m (0.1 xx 10^(-6) kg xx Delta v)`
`= (6.6 xx 10^(-34) kg m^(2) s^(-1))/(4 xx 3.14)`
or `Delta v = 5.25 xx 10^(-24) ms^(-1)`
Discussion
47.

The uncertainty in the position of a flying dust particle of mass 0.1 mg is found to be 10^(-4)m. The uncertainty in the position of another flying dust particle of mass 0.5 mg is also found to be same If a third flying dust particle of mass 1 mg had the same uncertainty in position as in its velocity, the uncertainty in its momentum would be

Answer»

`5.2 xx 10^(-28) kg ms^(-1)`
`5.2 xx 10^(-34) kg ms^(-1)`
`7.2 xx 10^(-15) kg ms^(-1)`
`7.2 xx 10^(-21) kg ms^(-1)`

SOLUTION :Here, `Delta x = Delta v = x`(say)
Hence, `Delta x (m Delta v) = (h)/(4pi)` gives
`x xx (10^(-6) kg xx x) = (6.6 xx 10^(-34) g m^(2) s^(2))/(4 xx 3.14)`
or `x^(2) = 52.5 xx 10^(-30) or x = 7.25 xx 10^(-15)`
`:. Delta p = m Delta v = 10^(-6) kg xx 7.25 xx 10^(-15) ms^(-1)`
`= 7.25 xx 10^(-21) kg m s^(-1)`
Discussion
48.

The uncertainty in the position of a flying dust particle of mass 0.1 mg is found to be 10^(-4)m. The uncertainty in the position of another flying dust particle of mass 0.5 mg is also found to be same The uncertainty in the velocity of the heavier dust particle as compared to the lighter dust particle is

Answer»

5 times
`(1)/(5)th`
same
50 times

Solution :For HEAVIER DUST particle, `DELTA x' (m' xx Delta v') = (h)/(4PI)`
As `Delta x = Delta x' :. m Delta v = m' xx Delta v'`
or `(Delta v')/(Delta v) = (m)/(m') = (0.15mg)/(0.5mg) = (1)/(5)`
Discussion
49.

Which hydrated halide compound shows hydrolysis?

Answer»

`MgCl_(2)*8H_(2)O`
`SrCl_(2)*6H_(2)O`
`BaCl_(2)*2H_(2)O`
`CaCl_(2)*6H_(2)O`

SOLUTION :Hydrated halide compounds of Be and Mg show hydrolysis.
Discussion
50.

What is the difference between the terms 'hydrolysis' and 'hydration'? .

Answer»

Solution :Hydrolysis is a CHEMICAL reaction in which a substance reacts with water under neutral, ACIDIC or alkaline conditions.
`Na_(21)CO_(3)+2H_(2)Oto2NaOH+H_(2)CO_(3)` SALT 1 Base 2 Acid 1 Hydration on the other hand is the property of a chemical compound to take up molecules of water of crystallisation and get HYDRATED.
`CuSO_(4(s))+5H_(2)O_((l))+CuSO_(4)5H_(2)O_(s)`
Discussion