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31451.

The correct order regarding the electronegativity of hybrid orbitals or carbon is:

Answer»

`sp gt sp^(2) gt sp^(3)`
`sp lt sp^(2)gt sp^(3)`
`sp lt sp^(2) lt sp^(3)`
`sp gt sp^(2)lt sp^(3)`

Solution :More the s-character, more is the electronega - TIVITY.
Discussion
31452.

The correct order or increasing bond length C - H , C - O , C - C and C = C is-

Answer»

`C-HltC-OltC-CltC=C`
`C-HltC=CltC-OltC-C`
`C-CltC=CltC-OltC-H`
`C-OltC-HltC-CltC=C`

SOLUTION :It is a FACT.
Discussion
31453.

The correct order of volatility is

Answer»

`NH_(3) LT H_(2)O`
p-nitro phenollto-nitro phenol
`CH_(3)OH gt CH_(3)-O-CH_(3)`
`HFgtHC L`

ANSWER :B
Discussion
31454.

The correct order of value of pk_b the following amines is (i)C_2H_5NH_2(ii)(C_2H_5)_2NH(iii)(C_2H_5)_3N

Answer»

`(i)GT(II)gt(III)`
`(iii)gt(ii)gt(i)`
`(ii)gt(i)gt(iii)`
`(i)gt(iii)gt(ii)`

ANSWER :D
Discussion
31455.

The correct order of thermal stability of hydroxides is :

Answer»

`Ba(OH)_(2) LT Ca(OH)_(2)lt Sr(OH)_(2) lt MG(OH)_(2)`
`Mg(OH)_(2) lt Sr(OH)_(2) ltCa(OH)_(2) LTBA(OH)_(2)`
`Mg(OH)_(2) lt Ca(OH)_(2)lt Sr(OH)_(2) lt Ba(OH)_(2)`
`Ba(OH_(2) lt Sr(OH)_(2) lt Ca(OH)_(2) lt Mg(OH)_(2)`

SOLUTION :Quick lime is commercial name of `CaO`
Discussion
31456.

The correct order of thermal stability of hydrogen halides (HX) is:HIgtHBrgtHCLgtHF,HFgtHCLgtHBrgtHI,HCLltHFltHBrltHI,HIgtHCLgtHFgtHBr.

Answer»

`HIgtHBrgtHCLgtHF`
`HFgtHCLgtHBrgtHI`
`HCLLTHFLTHBRLTHI`
`HIGTHCLGTHFGTHBR`

ANSWER :B
Discussion
31457.

The correct order of thermal stability of hydrogen halides (H-X) is :

Answer»

`HI gt HBr gt HCL gt HF`
`HF gt HCl gt HBr GTHI`
`HCl lt HF gt HBr gt HI`
`HI gt HCl gt HF gt HBr.`

Solution :Thermal stability is directly proportinal to BOND DISSOCIATION energy and bond dissociation energy is inversely proportinal to bond length. The decreasing order of bond dissociation energy is `HF gt HCl gt HBr gt HI`.
Discussion
31458.

The correct order of the thermal stability of hydrogen halide (H - X) is

Answer»

`HIGTHBRGTHCLGTHF`
`HFGTHCLGTHBRGTHI`
`HClltHFgtHBrltHI`
`HIgtHClltHFltHBr`

ANSWER :B
Discussion
31459.

The correct order of the thermal stability of hydrogen halide is ……………… .

Answer»

`HI GT HBr gt HCl gt HF`
`HF gt HCl gt HBr gt HI`
`HCl gt HF gt HBr gt HI`
`HI gt HCl gt HF gt HBr`

SOLUTION :`HF gt HCl gt HBr gt HI`
Discussion
31460.

The correct order of the stoichiometries of AgCl formed when AgNO_(3) in excess is treated with the complexes CoCl_(3).6 NH_(3), CoCl_(3).5 NH_(3), CoCl_(3).4 NH_(3) respectively is

Answer»

1 AgCl, 3 AgCl, 2 AgCl
3 AgCl, 1 AgCl, 2 AgCl
3 AgCl, 2 AgCl, 1 AgCl
2 AgCl, 3 AgCl, 1 AgCl

Solution :Remembering that coordination number of Co is 6, the complex `CoCl_(3).6NH_(3)` can be written as `[Co(NH_(3))_(6)]Cl_(3)` which provides `3 Cl^(-)` ions to be precipitated with excess of `AgNO_(3)` solution giving 3 moles of AgCl PRECIPITATE. Similarly, `CoCl_(3).5 NH_(3)` is `[Co(NH_(3))_(5)Cl]Cl_(2)` which gives 2 moles of AgCl precipitate and `CoCl_(2).4 NH_(3)` is `[Co(NH_(3))_(4)Cl_(2)]Cl` which gives 1 MOLE of AgCl precipitate with `AgNO_(3)` solution. Thus, the correct order of stoichiometries of AgCl formed is 3 AgCl, 2 AgCl and 1 AgCl.
Discussion
31461.

The correct order of the thermal stability of hydrogen halide is

Answer»

`HI GT HBR gt HClgt HF`
`HF gt HCL gt HBr gt HI`
`HCl gt HF gt HBr gt HI`
`HI gt HCl gt HF gt HBr`

Solution :`HF gt HCl gt HBr gt HI`
Discussion
31462.

The correct order of the stiochiometers of AgCl formed when AgNO_3 in excess is treated with the complexes.CoCl_3. 6NH_3, CoCl_3. 5NH_3, CoCl. 4NH_3 respectively is :

Answer»

2AgCl, 3AgCl, 1AgCl
1AgCl, 3AgCl, 2AgCl
3AgCl, 1AgCl, 2AgCl
3AgCl, 2AgCl, 1AgCI

Answer :D
Discussion
31463.

The correct order of the solubility of the different alcohols in water is

Answer»

n-propyl alcohol `GT` ethyl alcohol `gt`n-butyl alcohol
Ethyl alcohol `gt` n-butyl alcohol `gt` n-propyl alcohol
n-butyl alcohol `gt` n-propyl alcohol `gt` ethyl alcohol
Ethanol `gt` n-propanol alcohol `gt` ethyl alcohol

Solution :Ethanol `gt` n-propanol `gt` n-butyl alcohol
Solubility of ALCOHOLS in water decreases as the size of alkyl group of alcohols because tendency to FORM hydrogen BONDING decreases.
`underset({:("Isopentyalcohol"),("or 3-methyl butane 2-ol"):})((CH_(3))_(2)underset([D])(CH.CH_(2))CH_(2)OH)`
Discussion
31464.

The correct order of the size of the iodine species is

Answer»

`I GT I ^(+) gt I^(-)`
`I gt I^(-) gt I^(+)`
`I^(+) gt I^(-) GTI`
`I^(-) gt IGT I^(+)`

ANSWER :D
Discussion
31465.

The correct order of the reactivity of the following compounds towards nucleophilic substitution in the following compounds is .

Answer»

(iv)gt(Iii)gt(v)gt(II)gt(`i`)
(iii)gt(iv)gt(v)gt(ii)gt(`i`)
(iv)gt(Ii)gt(iii)gt(`i`)gt(v)
(ii)gt(iii)gt(v)gt(iv)gt(`i`)

Solution :It is the correct sequence.
* BENZYL carbocation is RESONANCE stabilised.
* `NO_(2)` group is an electron withdrawing group
* `+I` effect of `OCH_(3)` group is more than that of `CH_(3)` group.
Discussion
31466.

The correct order of the size of the iodine species is :

Answer»

I GT `I^+` gt` I^-`
`I gt I^- gt I^+`
`I^+ gt I^- gt I`
`I^- gt I gt I^+`

ANSWER :D
Discussion
31467.

The correct order of the packing efficiency in different types of unit cells is ...........

Answer»

fcc `lt` BCC `lt`simple cubic 
fcc `GT` bcc `gt` simple cubic 
fcc `lt` bcc `gt` simple cubic 
bcc `lt` fcc `gt` simple cubic 

Solution :`{:("UNIT CEL","Packing efficiency"),("fcc", 74 %),("bcc", 68 %),("Simple cubic", 52 %):}`
Discussion
31468.

The correct order of the packing efficiency in different types of unit cells is

Answer»

`"fcc" lt "bcc" lt "simple CUBIC"`
`"fcc" gt "bcc" gt "simple cubic"`
`"fcc" lt "bcc" gt "simple cubic"`
`"bcc" lt "fcc" gt "simple cubic"`

SOLUTION :Number of tetrahedral VOIDS is always DOUBLE than the number of octahedral voids.
Discussion
31469.

The correct order of the increasing ionic character is

Answer»

`BeCl_(2)ltMgCl_(2)ltCaCl_(2)ltBaCl_(2)`
`BeCl_(2)ltMgCl_(2)ltBaCl_(2)gtCaCl_(2)`
`BeCl_(2)ltBaCl_(2)ltMgCl_(2)ltCaCl_(2)`
`BaCl_(2)ltCaCl_(2)ltMgCl_(2)ltBeCl_(2)`

SOLUTION :Alkali METALS have the configuration `(n-1)s^(2)p^(6),NS^(1)`.
Discussion
31470.

The correct order of the increasing basicity of methyl amine , ammonia and aniline is :

Answer»

Methylamine `lt` ANILINE `lt` AMMONIA
Aniline `lt` Ammonia `lt` Methylamine
Aniline `lt` Methylamine `lt` Ammonia
Ammonia `lt` Aniline `lt` Methylamine

ANSWER :B
Discussion
31471.

The correct order of acidic strength of the following is:

Answer»

IIIgtIVgtIIgtI
IVgtIIIgtIgtII
IIIgtIIgtIgtIV
IIgtIIIgtIVgtI

Answer :A
Discussion
31472.

The correct order of the groups -CN(a), - Cl(b), - CF_3 (c ) and -NO_2(d) in increasing the strength of a carboxylic acid, when they are bounded to a -carbon of carboxylic acid separately is

Answer»

a LT B lt c lt d
d lt a lt b lt c
b lt a lt DLT c
b lt d lt a lt c

Answer :C
Discussion
31473.

The correct order of the first ionization enthalpies is :

Answer»

Mn lt TI ltZn lt Ni
Ti lt Mn lt Ni lt ZN
Zn ltNi lt Mn lt Ti
Ti lt Mn lt Zn lt Ni

Solution :Ti < Mn < Ni < Zn
Discussion
31474.

The correct order of the ease with which primary, secondary and tertiary alcohols can be dehydrated using concentrated H_2SO_4 is :

Answer»

`TERTIARY GT SECONDARY gt PRIMARY`
`Primary gt secondary gt Tertiary`
`Secondary gt Tertiary gt Primary`
`Secondary gt Primary gt Tertiary`

ANSWER :A
Discussion
31475.

The correct order of the dipole moment is :

Answer»

`CH_(4)gtNF_(3)gtNH_(3)gtH_(2)O`
`NF_(3)gtCH_(4)gtNH_(3)gtH_(2)O`
`NH_(3)gtNF_(3)gtCH_(4)gtH_(2)O`
`H_(2)OgtNH_(3)gtNF_(3)gtCH_(4)`

Answer :A
Discussion
31476.

The correct order of the basicity of the leaving group is

Answer»

`OVERSET(-)(O)R GT RCOoverset(-)(O) gt H_2overset(-)(N): gt :CL^(-)`
`Cl^(-) gt H_2overset(-)(N) : gt overset(-)(O)R gtRCOoverset(-)(O)`
`H_2overset(-)(N): gt : O overset(-)(R ) gt RCO overset(-)(O): gt Cl^(-)`
`RCOO^(-) : gt H_2overset(-)(N) gt : Cl^(-) gt : OR^(-)`

Solution :`H_2overset(-)(N): gt : O overset(-)(R ) gt RCO overset(-)(O): gt Cl^(-)`
Discussion
31477.

The correct order of the addition reaction rates of halogen acids with ethylene is

Answer»

hydrogen chloride`gt` hydrogen bromide `gt` hydrogen iodide
hydrogen iodide `gt` hydrogen bromide `gt` hydrogen chloride
hydrogen bromide `gt` hydrogen chloride `gt` hydrogen iodide
hydrogen iodide `gt` hydrogen chloride `gt` hydrogen bromide .

Solution :As we go from HF to HI , bond strength decreases , THEREFORE reactivity of HALOGEN halides INCREASES as : `HI gt HBr gt HCL` .
Discussion
31478.

The correct order of the acidity of hydrohalic acids?

Answer»

`HF GT HCL gt HBr gt HI`
`HCl gt HF gt HBr gt HI`
`HBr gt HCl gt HF gt HI`
`HI gt HBr gt HCl gt HF`

Solution :`HI gt HBr gt HCl gt HF`
Discussion
31479.

The correct order of sulphur - oxygen bond energy in S_(2)O_(3)^(2-), SO_(4)^(2-), SO_(3) and S_(2)O_(6)^(2-) is

Answer»

`S_(2)O_(3)^(2-) LT SO_(4)^(2-) lt SO_(3) lt S_(2) O_(6)^(2-)`
`S_(2)O_(3)^(2-) lt S_(2)O_(6)^(2-) lt SO_(4)^(2-) lt SO_(3)`
`S_(2)O_(3)^(2-) lt SO_(4)^(2-) lt S_(2)O_(6)^(2-) lt SO_(3)`
`S_(2)O_(6)^(2-) lt SO_(4)^(2-) lt SO_(3) lt S_(2)O_(3)^(2-)`

Answer :C
Discussion
31480.

The correct order of strength of H- bond in the following compound :

Answer»

`H_2O GT H_2O_2 gt HF gt H_2S`
`HF gt H_2O_2 gt H_2O gt H_2S`
`HF gt H_2O gt H_2S gt H_2O_2`
`HF gt H_2O gt H_2O_2 gt H_2S`

ANSWER :B
Discussion
31481.

The correct order of strength of acidity of the following compounds is

Answer»

(II) GT (i) gt (III) gt (IV)
(i) gt (ii) gt (iii) gt (iv)
(iv) gt (iii) gt (ii) gt (i)
(iv) gt (iii) gt (i) gt (ii)

ANSWER :D
Discussion
31482.

The correct order of stability of the holous acid in aqueous solution is

Answer»

`HCIO LT HBRO lt HIO`
`HCIO gt HBrO lt HIO`
`HCIO gt HBrOgt HIO`
`HCIO lt HBrO gt HIO`

ANSWER :C
Discussion
31483.

The correct order of stability of the following resonance structures is(I) H_(2)C = overset(+)(N)= overset(-)(N) ""(II)H_(2)overset(+)(C )-N = overset(-)(N)(III) H_(2)overset(-)(C )-overset(+)(N)-=N ""(IV)H_(2)overset(-)(C )N = overset(+)(N)

Answer»

`I GT II gt IV gt III`
`I gt III gt II gt IV`
`II gt I gt III gt IV`
`III gt I gt IV gt II`

ANSWER :B
Discussion
31484.

The correct order of solubility of following compound is (1)H -CHO ""(2) CH_(3)-CHO (3) CH_(3) - CH_(2)-CHO""(4) CH_(3) - COCH_(3)

Answer»

` 4 gt 3 gt 2 gt 1`
` 1 gt 2 gt 4 gt 3`
` 1 gt 2 gt 3 gt 4`
` 1 gt 4 gt 2 gt 3`

ANSWER :C
Discussion
31485.

The correct order of mobility of alkali metal ions in aqueous solution is

Answer»

`RB^(+) GT K^(+) gt NA^(+) gt LI^(+)`
`Li^(+) gt Na^(+) gt K^(+) gt Rb^(+)`
`Na^(+) gt K^(+) gt Rb^(+) gt Li^(+)`
`K^(+) gt Na^(+) gt Rb^(+) gt Li^(+)`

Answer :A
Discussion
31486.

The correct order of solubility of the sulphates of alkaline earth metals in water is:

Answer»

`BegtCagtMggtBagtSr`
`MggtBegtBagtCagtSr`
`BegtMggtCagtSrgtBa`
`MggtCagtBagtBegtSr`

ANSWER :C
Discussion
31487.

The correct order of solubility of fluorides of alkaline earth metals:

Answer»

`MgF_2 GT BaF_2 gt SrF_2 gt CaF_2 gt BeF_2`
`BeF_2 gt MgF_2 gt CaF_2 gt SrF_2 gt BaF_2`
`BaF_2 gt SrF_2 gt CaF_2 gt MgF_2 gt BeF_2`
NONE of these

Answer :B
Discussion
31488.

The correct order of solubility of isomeric 1^@,2^@ and 3^@ alcohol in water is :

Answer»

`3^@ GT 2^@ gt 1^@`
`1^@ gt 2^@ gt 3^@`
`3^@ gt 1^@ gt 2^@`
None

Answer :B
Discussion
31489.

The correct order of S_N 2//E2 ratio for the % yield of product of the following halide is- (P)CH_3-CH-undersetunderset(I)(|)oversetoverset(Ph)(|)C-CH_3 , (Q)CH_3-undersetunderset(Ph)(|)CH-undersetunderset(I)(|)CH-CH_3 (R)CH_3-CH_2-I , (S)CH_3-CH-undersetundersetI|CH-CH_3

Answer»

RgtSgtQgtP
RgtQgtSgtP
PgtRgtSgtQ
QgtPgtRgtS

Solution :As STERIC hindrance increases rate of `S_(N_2)` DECREASE and rate of E2 increases.
Discussion
31490.

The correct order of solubility in water for He, Ne, Ar, Kr, Xe is

Answer»

`He GT Ne gt Ar gt Kr gt Xe`
`Ne gt Ar gt Kr gt He gt Xe`
`Xe gt Kr gt Ar gt Ne gt He `
`Ar gt Ne gt He gt Kr gt Xe`

Solution :`Xe gt Kr gt Ar gt Ne gt He `
SOLUBILITY in DECREASING ORDER.
Discussion
31491.

The correct order of second ionization potential of C, N, O and F is :

Answer»

Cgt N gt OGT F
O gt Ngt F gt C
O gt F gt N gt C
Fgt O gt N gt C

Answer :C
Discussion
31492.

The correct order of S-S bod length is following oxyanions is : (i) S_(2)O_(4)^(2-) (ii) S_(2)O_(5)^(2-) (iii) S_(2)O_(6)^(2-)

Answer»

`I GT II gt III`
`I gt III gt II`
`III gt II gt I`
`III gt I gt II`

SOLUTION :
According to `L.P-L.P gt L.P-B.P gt B.P-B.P` REPULSION, the correct ORDER of s-s bond length will be : `x_(1) gt x_(2) gt x_(3)`.
Discussion
31493.

The correct order of S-S bond length in following oxyanions is: S_(2)O_(4)^(2-) (II) S_(2)O_(5)^(2-) (III) S_(2)O_(6)^(2-)

Answer»

`I GT II gt III`
`I gt III gt II`
`III gt II gt I`
`III gt I gt II`

Solution :
ACCORDING to BENTS rule `x_(1) gt x_(2) gt x_(3)`.
Discussion
31494.

The correct order of second I.E. of C, N, O and F are in the order:

Answer»

FgtOgtNgtC
CgtNgtOgtF
OgtNgtFgtC
OgtFgtNgtC

Answer :D
Discussion
31495.

The correct order of S-O bond length is :

Answer»

`SO_(3)^(2-)gtSO_(4)^(2-)gtSO_(3)gtSO_(2)`
`SO_(3)^(2-)gtSO_(4)^(2-)gtSO_(2)gtSO_(3)`
`SO_(4)^(2-)gtSO_(3)^(2-)gtSO_(2)gtSO_(3)`
`SO_(4)^(2-)gtSO_(3)^(2-)gtSO_(3)gtSO_(2)`

SOLUTION :
B.O`=(4)/(3)=1.33`B.O.`=(6)/(4)=1.5`
`[B.I.prop(1)/(B.O)]`
`THEREFORE SO_(3)^(2-) gtSO_(4)^(2-)gtunderset("Bent.s Rule")(SO_(2)gtSO_(3))`
Discussion
31496.

The correct order of relative tendancy of the metal to undergo oxidation is

Answer»

Mg `GT` Cr `gt` Hg `gt` Ag
Mg`gt ` Hg `gt` Cr `gt` Ag
Mg `gt ` Ag `gt` Cr `gt` Hg
Mg `gt` Cr `gt` Ag `gt `Hg

Solution :GREATER metallic character HENCE greater tendency to UNDERGO oxidation
Discussion
31497.

The correct order of relative acidic strength of phenol, ethyl alcohol and water is

Answer»

`"PHENOL" GT "Water" gt "ETHYL alcohol"`
`"Ethyl alcohol" gt "Water" gt "Phenol"`
`"Ethyl alcohol" gt "Phenol" gt "Water"`
`"Water" gt "Phenol" gt "Ethyl alcohol"`

Answer :A
Discussion
31498.

The correct order of reducing power of MH_(3) is

Answer»

`NH_3 lt PH_3 lt SbH_3 lt BiH_3`
`PH_3 lt AsH_3 lt BiH_(3) lt SbH_3`
`BiH_(3) lt SbH_(3) lt PH_(3) lt NH_3`
`PH_(3) lt AsH_(3) lt SbH_(3) lt BiH_3`

Solution : REDUCING power `prop (1)/("Thermal STABILITY")`
Thermal stability : `NH_(3) gtPH_(3) GT ASH_(3) gtSbH_(3) gtBiH_3`
Reducing Nature : `underset("Weakly reducing")(NH_3) lt PH_3 gt AsH_3 gt SbH_3gtunderset("Strongly reducing")( BiH_3)`
Discussion
31499.

The correct order of reducing power of ahlide ions is :

Answer»

`CL^- gt BR^-gt I^-gt F^-`
`Cl^- gt I^-gtBr^-GTF^-`
`Br^- gt Cl^- gt L^- gt F ^-`
`I^- gt Br^- gt Cl^- gtF^-`

ANSWER :D
Discussion
31500.

The correct order of reducing abilities of VA group hydrides is

Answer»

`NH_(3) LT PH_(3) lt AsH_(3) lt SbH_(3) lt BiH_(3)`
`NH_(3) GT PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)`
`NH_(3) lt PH_(3) lt AsH_(3) gt SbH_(3) gt BiH_(3)`
`SbH_(3) gt BiH_(3) gt AsH_(3) gt NH_(3) gt PH_(3)`

Answer :1
Discussion