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28101.

The most common oxidation state of lanthanoids are :

Answer»

`+1,+2`
`+2,+4`
`+2`
`+2,+3,+4`

SOLUTION :is the CORRECTANSWER
Discussion
28102.

The measured freezing point depresion for a 0.1 m aqueous CH_(3)COOH solution is 0.19 ""^(@C). The acid dissociation constant, K_(a) at this concentration will be (Given K_f, the molal cryoscopic constant = 1.86 K kg mol^(-1))

Answer»

`4.76 xx 10^(-5)`
`4 xx 10^(-5)`
`8 xx 10^(-5)`
`2 xx 10^(-5)`

Solution :`Delta T_(F) = i xx K_(f) xx m`
` i = (0.19)/(1.86 xx 0.1) = 1.02`
`alpha = (i-1)/(n-1) = (0.02)/(1) = 2 xx 10^(-2)`
`K_(a) = C alpha^(2) =1 xx 10^(1-) xx(2 xx 10^(-2))^(2) = 4 xx 10^(-5)`
Discussion
28103.

The most common oxidation state of an element is -2. The number of electrons present in its outer most shell is:

Answer»

2
4
6
8

Answer :C
Discussion
28104.

The measure of net molecular polarity is a quantity called dipole moment which is defined as the magnitude of the charge Q at either end of the molecular dipole times the distance 'r' between the charge : mu=Qxxr Molecular polarities give rise to some of the forces that occur between molecules.Such forces are termed as intermolecular forces.These molecular forces are of several different types including dipole-dipole forces, London dispersion forces, hydrogen bonds and ion-dipole forces (operate between ions and molecules).These intermolecular forces are electrical in origin and results from the mutual attraction of unlike charges or the mutual repulsion of like charges. A formal positive charge on the central atom affect the size of orbitals.A formal positive charge on central atom will pull in all electrons towards the nucleus and this will leads to the contraction in size of orbitals. Which of the following molecule does not have dipole moment ?

Answer»

`TRANS - N_2F_2`
`NF_3`
`CIO_2`
`CH_2Cl_2`

SOLUTION :
Discussion
28105.

The mean pairing energy and octahedral field splitting energy of [Mn(CN)_(6)]^(3-) are 28,800cm^(-1) and 38500cm^(-1) respectively. Whether this complex is stable in low spin or high spin?

Answer»

Solution :Mean pairing ENERGY `=28,800cm^(-1)`
OCTAHEDRAL FIELD splitting energy `=38500cm^(-1)`
`[Mn(CN)_(6)]^(3-) Mn=3d^(5)4s^(2)M_(n)^(3+)=3d^(4)`
Discussion
28106.

The most common oxidation state of actinoids is

Answer»

2
3
4
6

Answer :C
Discussion
28107.

The mostcommonoxidationstateof actinoids is

Answer»

`+ 2`
`+3`
`+4`
`+6`

ANSWER :C
Discussion
28108.

The mean pairing energy and octahedral field splitting energy of[Mn(CN)_]^(3-)are 28,800 cm ^(-1)and 38500cm ^(-1)respectively Whether this complex is stable in low spin or high spin?

Answer»

Solution :(i). The complex has octahedral shape.
(II). ` CN^(-) ` is strong -field LIGAND
(iii) The d-electronic configuration of Mn is `d^(5)`
(iv) The splitting energy is large ` therefore ` The complex is stable in LOW spin.
Discussion
28109.

The mean free path of a gas at 1 atm pressure is l. Its mean free path at 5 atm pressure will be

Answer»

5L
`L//5`
25l
0.04l

Solution :Mean free PATH, `l PROP ( 1)/( p )`
Discussion
28110.

The most common oxidation state exhibited by all lanthanoids is

Answer»

`+1`
`+2`
`+3`
`+4`

ANSWER :C
Discussion
28111.

The mean free path (lambda) of a gas sample is given by :

Answer»

`LAMBDA` = sqrt2pisigma^2N`
`lambda` = 1/sqrt2pisigma^2N`
`lambda = sqrt2upisigma^2N`
NONE of these

Answer :B
Discussion
28112.

The most common noble gas obtained in the radioactive decay is

Answer»

He
Ar
Xe
Rn

Answer :A
Discussion
28113.

The maximum work that can be obtained from a galvanic cell is ………………

Answer»

`+ NFE`
`-nFE`
`2F`
`96500 F`

ANSWER :B
Discussion
28114.

The most common name of bis (cyclopentadienyl) iron is ….. .

Answer»

SOLUTION :FERROCENE
Discussion
28115.

The maximum work that can be derived from a chemical reaction is

Answer»

`W_(MAX)=DELTAH`
`W_(max)=DeltaG`
`W_(max)=DELTAE`
`W_(max)=DeltaS`

Answer :B
Discussion
28116.

The most common constituent of steel is :

Answer»

C
O
Cr
S

Answer :A
Discussion
28117.

The maximum work obtained by an isothermal reversible expansion of 1 mol of an ideal gas at 27^(@)C from 2.24 to 22.4L is (R = 2 cal)

Answer»

1381.8 cal
600 cal
138.18 cal
690.9 cal

Solution :`w = nRT "LN" (V_(2))/(V_(1))`
`= 1 XX 2 xx 300 x 2.303 "LOG" (22.4)/(2.4)`
`= 1381.8 cal`
Discussion
28118.

The maximum work obtainable from a reversible process is given as

Answer»

`-DELTAA`
`DeltaA`
`-DELTAG`
`DeltaG`

ANSWER :A
Discussion
28119.

The most common mineral containing lanthanoids is "…................".

Answer»


ANSWER :monazite SAND( LANTHANOID ORTHO phosphate)
Discussion
28120.

The maximum wavelength of radiation that can ionize a sodium atom is 2414 A the ionization energy of sodium per moleshall be

Answer»

`241.4 J MOL^(-1)`
`479.7 j mol^(-1)`
`241.4 K j mol^(-1)`
`497.11 j mol^(-1)`

ANSWER :D
Discussion
28121.

The most common chemical method to perserve fishes is

Answer»

dehydration
irradiation
salting
by ADDING sugar

Answer :C
Discussion
28122.

The maximum work done in expanding 16 g oxygen at 300K and occupying a volume of 5 dm^3 isothermally until the volume become 25 dm^3 is:

Answer»

`2.01X10^3 J`
`+2.81X10^3 J`
`2.01X10^-3 J`
`+2.01X10^-6J`

ANSWER :A
Discussion
28123.

The most common cations in biological systems are :

Answer»

`NA^(+)andMg^(2+)`
`Ca^(2+)andMg^(2+)`
`Na^(+)andK^(+)`
`K^(+)andMg^(2+)`

ANSWER :C
Discussion
28124.

The maximum wavelength of light that can excite an electron from first to third orbit of hydrogen atom is:

Answer»

487 nm
170 nm
103 nm
17 nm

Answer :C
Discussion
28125.

The most characteristic oxidation state of lanthanide is

Answer»

`+2`
`+3`
`+4`
`+6`

ANSWER :B
Discussion
28126.

The maximum valency of halogen group with respect to oxygen is

Answer»

1
5
6
7

Solution :SEVEN, as in `Cl_(2) O_(7), I_(2)O_(7)` ETC.
Discussion
28127.

The most basic oxide among the following is:

Answer»

`Na_2O`
BAO
`As_2O_3`
`Al_2O3`

ANSWER :A
Discussion
28128.

The maximum valency (=8) is shown by

Answer»

XE, OS
Xe, RU
Xe, Os, Ru
Xe,Os, Ru,Mn

Answer :C
Discussion
28129.

The most basic hydroxide from following is

Answer»

`Pr(OH)_(3)(Z=59)`
`Sm(OH)_(3)(Z=62)`
`Ho(OH)_(3)(Z=67)`
`LA(OH)_(3)(Z=57)`

Solution :Due to lanthanoid CONTRACTION, the basic character of HYDROXIDES decreases from `La^(3+)` to `LU^(3+)`
As a result, covalent nature of Ln - OH bond also increases. Thus the most basic hydroxide among the gicen option is `La(OH)_(3)`.
Discussion
28130.

The maximum valency (8) is shown by

Answer»

XE and OS only
Xe and RU only
Xe, Os and Ru
Xe, Os, Ru and Mn

Answer :C
Discussion
28131.

The maximum tendency to form the uni positive ion is for the element with configuration.

Answer»

`1s^(2)2S^(2)2p^(6)3s^(2)`
`1s^(2)2S^(2)2p^(6)3s^(2)3p^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(3)`

Answer :B
Discussion
28132.

The maximum stabilization energy is associated with …....

Answer»


`CH_2 = CH-CH_(2)^(Ө)`

ANSWER :C
Discussion
28133.

The maximum sum of the number of neutrons and protons in an isotope of hydrogen is:

Answer»

6
5
4
3

Answer :D
Discussion
28134.

The most basic compounds in the following is

Answer»

<P>Benzylamine
Aniline
Acetanilide
`p`-nitroaniline

Answer :A
Discussion
28135.

The maximum ra dius of sphere that can be fitted in the octahedral hole of cubicalclosed packing of sphere of raius r is

Answer»

0.732I
0.414 I
0.225I
0.155I

Solution :r=0.414R.
Discussion
28136.

The most basic compound amonst the following is

Answer»

Benzylamine
Aniline
p-Nitroaniline
Ethanamide.

Solution : or benzyl amine (A) is most BASIC AMONG the given COMPOUNDS.
Discussion
28137.

The most basic compound among the following is

Answer»

`C_2H_5NH_2`
`C_6H_5NH_2`
`NH_3`
`(C_2H_5)_2NH`

ANSWER :D
Discussion
28138.

The maximum proportion of available volume that can be filled by hard spheres in diamond is:

Answer»

0.52
0.34
0.32
0.68

Answer :B
Discussion
28139.

The maximum probability of finding electron in the d_(yz) orbital is :

Answer»

Along the y-AXIS
Along the Z-axis
At an ANGLE of `45^(@)` from the y and z axis
At an angle of `90^(@)` from the x and y axis.

Answer :C
Discussion
28140.

The maximum probability of finding electron in d_(xy) orbital is,

Answer»

ALONG the X axis
along the y-axis
at an angle of `45^(@)`FORM the x and y -xis
along x and y-axis

Answer :C
Discussion
28141.

The most appropriate reagent to distinguish an aldehyde from a ketone is :

Answer»

AMMONIACAL `AgNO_3`
`I_2 ` + NaOH
BAEYER's reagent
Sodium bisulphite solution

ANSWER :A
Discussion
28142.

The maximum prescribed concentration of cadmium in drinkingwater in ppm is

Answer»

0.05
3
2
5

Answer :C
Discussion
28143.

The most appropriate reagent to convert RCOOEt to RCH_(2)OH

Answer»

`LiAlH_(4)`
`NaBH_(4)`
`H_(2)//Pd-C`
`Li//NH_(3)"(LIG)"`

SOLUTION :Esters are reduced to alcohols by `LiAlH_(4)`
Discussion
28144.

The most appropriate reagent for the conversion of 2-pentanone to butanoic acid is

Answer»

SODIUM hypoiodite
`O_(2)`
acidified `KMnO_(4)`
ALKALINE `KMnO_(4)`

Answer :A
Discussion
28145.

The most appropriate name for zero group elements

Answer»

NOBLE GASES
Aerogens
Inert gases
RARE gases

Answer :A
Discussion
28146.

The most appropriate major product of the following sequence of reactions would be. overset(CH_3-oversetoverset(O)(||)C-O-O-H)tooverset(LiAID_4)tooverset(H_3O^+)to

Answer»




SOLUTION :
Discussion
28147.

The maximum oxidation state that can be exhibited by a halogen in its second excited state

Answer»

`+1`
`+3`
`+5`
`+7`

ANSWER :C
Discussion
28148.

The most adverse effect of radioactive pollutants

Answer»

Gene MUTATION
Hepatitis
Polio
TB

Solution :RADIOACTIVE pollution causes gene mutation. It can CHANGE the base squence of DNA
Discussion
28149.

The most adsorbed gas on activated chrocal is

Answer»

`N_(2)`
`H_(2)`
`CO_(2)`
`CH_(4)`

Solution :More easily LIQUEFIABLE gas, i.e., HIGHER the critical TEMP., more is the adsorption.
Discussion
28150.

The maximum oxidation state shown by osmium is :

Answer»

`+6`
`+7`
`+8 `
`+5`.

ANSWER :C
Discussion