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27851.

The most suitable reagents required to prepare iodobutane from 1-butene are :

Answer»

<P>P and `I_(2)`
HI in the PRESENCE of `H_(2)O_(2)`
KI
HBr/`H_(2)O` and `I_(2)`/acetone

Answer :D
Discussion
27852.

The most suitable reagent for the conversion of RCH_(2)OHto RCHO and obtain good yield is

Answer»

`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`CrO_(3)`
PCC (pyridinium chlorochromate)

SOLUTION :A better reagent for oxidation of primary alcohols to ALDEHYDES in GOOD yield is pyridinium chlorochromate (PCC), a complex of chromium trioxide with pyridine and `HCl. CrO_(3)` in anhydrous medium is also used as the oxidising agent for the isolation of aldehydes, but good yield obtain from PCC.
Discussion
27853.

The metal used in acid storage batteries is :

Answer»

COPPER
Tin
Magnesium
Lead

Answer :D
Discussion
27854.

Which is the most suitable reagent for the following conversion ? CH_(3)-CH=CH-CH_(2)-overset(O)overset(||)(C)-CH_(3)to CH_(3)-CH=CH-CH_(2)-overset(O)overset(||)(C)-OH

Answer»

TOLLEN's reagent
BENZOYL peroxide
`I_2 and NaOH` solution
SN and NaOH solution

Answer :C
Discussion
27855.

The most suitable reagent for the conversion of R-CH_(2)OH to R-CHO is

Answer»

PCC (Pyridinium CHLOROCHROMATE)
`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`CrO_(3)`

Solution :Pyridinium chlorochromate.
Discussion
27856.

The most suitable reagent for the conversion of R- CH_(2) - OH rarr R-CHO is

Answer»

`KMnO_4`
`K_2Cr_2O_7`
`CrO_3`
`PCC`

ANSWER :D
Discussion
27857.

The metal used for making armoured steel for tanks and domestic safes is :

Answer»

Maganese
Aluminium
Lead
Chromium

Answer :A
Discussion
27858.

The most suitable reagent for the conversion of is R - CH_2OH to RCHO.........

Answer»

`KMnO_4`
`K_2Cr_2O_7`
`CrO_3`
PCC

Solution :Pcc
Discussion
27859.

The metal used for galvanisation of iron is ….

Answer»

Al
Zn
Cu
Au

Answer :B
Discussion
27860.

The most suitable reagent for convertion of R-CH_2-OH to R -CHO is

Answer»

NEUTRAL `KMnO_4`
PCC
acidic `K_2Cr_2O_7`
`CrO_3`

ANSWER :B
Discussion
27861.

The most suitable reagent 'A' for the reaction

Answer»

`O_(3)`
`H_(2)O_(2)`
`NaOH-H_(2)O_(2)`
m-chloroperbenzoic ACID

ANSWER :D
Discussion
27862.

The most suitable method of theseparation of a 1:1 mixture ofortho and para nitrophenols is

Answer»

DISTILLATION
Sublimation
Crystallization
Chromatography

Solution :o- and p-nitrophenols are SEPARATED by STEAM distillation because o-nitrophenol is steam volaitile while p-isomer is not.
Discussion
27863.

Name the metal used in galvanisation of iron?

Answer»

Zinc
Magnesium
Copper
Aluminum

Answer :A
Discussion
27864.

The most suitable method of separation of ortho and para-nitrophenol mixed in the ratio of 1 : 1 is

Answer»

STEAM distillation
vapourisation
crystallisation
colour spectrum

Answer :A::C
Discussion
27865.

The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenolsis -

Answer»

Sublimation
Chromatography
Crystallisation
Steam distillation

Answer :D
Discussion
27866.

The metal to be protected from corrosion is treated with conc HNO_(3). The process is called _______.

Answer»

galvanzing
passivation
cathodic protection
formation of alloys

Answer :B
Discussion
27867.

The most suitable method of separation of 1 :1 mixture of ortho and para nitrophenols is:

Answer»

STEAM DISTILLATION
Crystallisation
Sublimation
Chromatography

Answer :A
Discussion
27868.

The metal that produces red-violet colour in the non-luminous flame is

Answer»

Ba
Ag
Rb
Pb

Solution :ALKALI METALS and their SALTS impart a characteristics colour to flame. The reason for flame colouration is thatthe energy of the flame causes an EXCITATION of the outermost electrons which on return to their original position give out the ene3rgy so absorbed in the VISIBLE region. thus, Rb gives a red -violet colour to the flame.
Discussion
27869.

The most suitable method for the detemination of molecular weight of oxyhaemoglobin, a compound of high molecular weight is:

Answer»

OSMOTIC pressure METHOD
Vapour pressure LOWERING method
Elevation of boiling point MEHOD
None

Answer :A
Discussion
27870.

The most suitable indicator for the titration of NH_4OH against HNO_3 is

Answer»

phenolphthalein
methyl RED
thymol phthalein
none of these

Solution :`NH_(4)OH` is WEAK base and `HNO_(3)` is a strong base, therefore, most suitable indicator is methyl ORANGE.
Discussion
27871.

The metal that occurs in the native state as well as in the combined formis

Answer»

Silver
Magnesium
ALUMINUM
MANGANESE

ANSWER :A
Discussion
27872.

The most suitable indicator for the titration of HBr against KOH is

Answer»

phenolphthalein
methyl orange
bromothymol blue
all are correct

Solution :HBR is a strong acid and KOH is a strongbase, THEREFORE, both all the three can be USED as an indicator in the titration.
Discussion
27873.

The most suitable catalyst for the hydrogenation of 2-Hexyne to 2-cis-Hexene is

Answer»

`Pd-BaSO_(4)`
`(Ph_(3)P)_(3)RhCl`
10% Pd-C
Raney Ni

Solution :REDUCTION of alkynes with LINDAR's CATALYST `(Pd-BaSO_(4)` gives cis-alkencs.
Discussion
27874.

The most suitable indicator for the titration of HCOOH against NaOH is

Answer»

METHYL orange
phenolphthalein
thymol phthalein
Both (b) and (C)

SOLUTION :HCOOH is a weak acid and NAOH is a strong BASE, therefore, both, phenolphathalein and thymol phthalein can be used as indicator.
Discussion
27875.

The most suitable for the conversion of R- CH_(2)-OH to R-CHO is :

Answer»

`CrO_(3)`
PCC(Pyridinium Chlorochromate)
`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`

Solution :PCC(Pyridinium Chlorochromate)
Discussion
27876.

The most suitable indicator for the titration of Ba(OH)_2 against HI is

Answer»

phenolphthalein
methyl orange
Both (A) and (B)
NONE of these

Solution :`BA(OH)_(2)` is a strong base and HI is a strong acid, THEREFORE both phenolphthalein and methyl orange can be used as an indicator in their titration.
Discussion
27877.

The most strained cycloalkane is

Answer»

CYCLOPROPANE
Cyclobutane
Cyclopentane
Cyclohexane

Solution :
Cyclopropane with bond angle of `60^@` is very STRAINED and hence very REACTIVE
Discussion
27878.

The metal that is purified by 'poling' method is

Answer»

COPPER
SILVER
Aluminium
Iron

Answer :1
Discussion
27879.

The most strained cycloalkaneis

Answer»

CYCLOPROPANE
CYCLOPENTANE
CYCLOBUTANE
CYCLOHEXANE

ANSWER :A
Discussion
27880.

The most steam volatile species is:

Answer»




ANSWER :A
Discussion
27881.

The metal that forms nitride by reacting directly withN_(2) of air, is :

Answer»

Cs
K
Rb
LI

Solution :`Li+N_(2)RARR Li_(3)N,` Among alkali metals only LITHIUM combines withdue to lattice energy effect
Discussion
27882.

The most stable radical among the following is :

Answer»

`{:(CH_(2)-CH_(2)^(*)),(|),(NO_(2)):}`
`{:(CH_(2)-CH_(2)^(*)),(|),(COO^(-)):}`
`{:(C_(2)-CH_(2)^(*)),(|),(CH_(3)):}`
`{:(CH_(2)-CH_(2)^(*)),(|),(O^(-)):}`

ANSWER :D
Discussion
27883.

The metal that is extracted from sea-water is:

Answer»

Cl
Ca
Mg
Br

Answer :C
Discussion
27884.

The most stable product of following reaction is…... CH_3-underset(CH_3)underset(|)CH-CH=CH_2overset(HBr)rarr(?)

Answer»

`CH_3-UNDERSET(CH_3)underset(|)CH-underset(Br)underset(|)CH-CH_3`
`CH_3-OVERSET(Br)overset(|)underset(CH_3)underset(|)C-CH_2-CH_3`
`CH_3-underset(CH_3)underset(|)CH-CH_2-underset(Br)underset(|)CH_2`
`CH_3-underset(CH_2Br)underset(|)overset(H)overset(|)C-CH_2-CH_3`

ANSWER :B
Discussion
27885.

The most stable oxy acid of chlorine is :

Answer»

`HClO_(4)`
`HClO_(3)`
`HClO_(2)`
`HClO.`

Solution :`HClO_(4)` is most stable because of partial double bond CHARACTER and DELOCALISATION of `PI-` bond.
Discussion
27886.

The most stable oxidation state of thorium is

Answer»

`+3`
`+4`
`+5`
`+6`

Answer :B
Discussion
27887.

The metal that has the highest melting point and used in making hand steel is

Answer»

Cu
Mn
Zn
W

Solution :High MELTING point observed for 5D series W depends on METALLIC bond STRENGHT
Discussion
27888.

The metalthatdoes not give the borax head test is

Answer»

Cr
Ni
Pb
Mn

Answer :C
Discussion
27889.

The most stable oxidation state of Iron is

Answer»

`+II`
`+III`
`+I`
`+VI`

ANSWER :B
Discussion
27890.

The most stable oxidation state of copper is :

Answer»

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

ANSWER :A
Discussion
27891.

The metal that forms a self protecting film of oxide to prevent corrosion, is

Answer»

Cu
Al
Na
Au

Solution :ALUMINIUM forms a SELF protecting film of oxide to prevent CORROSION.
Discussion
27892.

The most stable nuclei have mass number :

Answer»

LESS than 50
about 56
about 180
greater than 180.

Answer :B
Discussion
27893.

The metal that does not give the borax-bead test is

Answer»

Chromium
Nickel
Lead
manganese

Solution :BORAX bead TEST is GENERALLY given by transition ELEMENTS.
Discussion
27894.

The most stable ion is:

Answer»

`[Fe(C_(2)O_(4))_(3)]^(3-)`
`[Fe(CN)_(6)]^(3-)`
`[Fe(CN)_(6)]^(4-)`
`[Fe(H_(2)O)_(6)]^(3+)`

Answer :B
Discussion
27895.

The most stable isomer of 1,2-dichloroethane is:

Answer»

Staggered
Gauche
Eclipsed
Partially eclipsed

Answer :B
Discussion
27896.

The most stable ion is :

Answer»

`Mn^(2+)`
`SC^(4+)`
`FE^(2+)`
`Mn^(3+)`

Answer :A
Discussion
27897.

The metal that does not liberate H_2 from dilute H_2SO_4 is:

Answer»

Al
Mg
Cu
Zn

Answer :C
Discussion
27898.

The moststablefreeradical is :

Answer»

`CH_(3) CH_(2) `
`CH_(3) CHC_(6) H_(5)`
`CH_(3) CHCH_(3)`
`C_(6) H_(5) CH_(2) CH_(2)`

ANSWER :B
Discussion
27899.

The metal that does not give the borax bead test is

Answer»

Cr
Ni
Na
Mn

Solution :METALS which form BASIC compoounds and have COLOURED salts give the BORAX bead test.
Discussion
27900.

The most stable free radical is :

Answer»

`CH_(3)^(•)`
`CH_(3)CH_(2)^(•)`
`(CH_(3))_(2)CH^(•)`
`(CH_(3))_(3)C^(•)`.

ANSWER :D
Discussion