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14101.

Which of the following species is not formed in Hofmann bromamide reaction

Answer»

R - CO NHBR
RCO `overset(..)UNDERSET(Theta)N` Br
RNCO
RCO `overset(..)N Theta`

Solution :HOFFMANN bromide MECHANISM
Discussion
14102.

underset(AlCl_(3))overset(CH_(2) = CH- CH_(2) -Cl)to A underset((ii) H_(2)O_(2)//O^()H)overset((i) BH_(3),THF)toB overset(HF, Delta)toC coompound C will be :

Answer»




Discussion
14103.

Write the IUPAC name of (i) Hg[Co(CNS)_(4)] (ii) K[Co(CN)(CO)_(2)(NO)]

Answer»

SOLUTION :(i) MERCURIC TETRATHIOCYANATOCOBALTATE (II)(ii) POTASSIUM dicarbonylcyanonitrosocobaltate (II)
Discussion
14104.

Which one of the following is most basic

Answer»

<P>`Al_(2)O_(3)`
MgO
`SiO_(2)`
`P_(2)O_(5)`

SOLUTION :`ubrace(MgO)_("Basic") ubrace(Al_(2)O_(3))_("AMPHOTERIC") ubrace(SiO_(2)"" P_(2)O_(5))_("ACIDIC")`
`MgO +H_(2)O to Mg(OH)_(2)` base of alkali
Discussion
14105.

Which conformation of C_(6)H_(6)Cl_(6) is most powerful insecticide

Answer»

aaeeee
aaaeee
aaaaee
aaaaaa

Solution :aaaeee FORM is the most powerful insecticide form of `C_(6)H_(6)Cl_(6)`.
Discussion
14106.

Which is the most stable oxidation state of Ti (Z = 22) in aqueous solution ?

Answer»

SOLUTION :`+4` is the most STABLE OXIDATION STATE.
Discussion
14107.

What is the action of acetic anhydride on : (a) Ethyl amine ? (b) Diethyl amine ?

Answer»

SOLUTION :
Discussion
14108.

Which is a buffer solution

Answer»

`CH_(3)COOH + CH_(3)COONa`
`CH_(3)COOH + CH_(3)COONH_(4)`
`CH_(3)COOH + NH_(4)Cl`
`NAOH + NACL`

Solution :Buffer solution is a MIXTURE of weak ACID and its conjugate base.
Discussion
14109.

What type of defect is shown by ZnS?

Answer»

SOLUTION :FRENKEL DEFECT.
Discussion
14110.

What is acidity constant? How is it expressed.

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SOLUTION :(i) The dissociation constant is generally called acidity constant because it measures the RELATIVE strength of an acid. The STRONGER the acid, the large will be its `K_(a)` value.
(ii) The strength of carboxylic acid can be EXPRESSED in terms of the dissociation constant `(K_(a))`:
`R^(-)COOH+H_(2)OhArrRCOO^(-)+H_(3)O^(+)`
`K_(a)=([RCOO^(-)][H_(3)O^(+)])/([RCOOH])`
(III) The dissociation constant of an acid can also be expressed in terms of `p^(Ka)` value.
`p^(Ka)=-logK_(a)`
Discussion
14111.

Which is gem-dihalide:

Answer»

`CH_3CHBr_2`
`CH_2BrcdotCH_2Br`
`CH_3cdotCHBrcdotCH_2Br`
None

Answer :A
Discussion
14112.

The reagent which is used to distinguish between propene and propyne is

Answer»

BROMINE
ALKALINE `KMnO_4`
AMMONIACAL `AgNO_3`
Ozone

Answer :C
Discussion
14113.

Write the name of the coordination isomer of the complex [Co(en)_(3)][Cr(CN)_(6)]

Answer»

SOLUTION :`[CR(EN)_(3)][Co(CN)_(6)]` = tris(ethane-1, 2-diamine) chromium (III) hexacyanocobaltate (III).
Discussion
14114.

The vitamin which is water soluble an d antioxidant

Answer»

vit-A
vit-B
vit-C
vit-D

Answer :C
Discussion
14115.

What is the standard reduction potential (E^(@)) for Fe^(3+) to Fe? Given that : Fe^(2+) + 2e^(-) to Fe, E_(Fe^(2+)//Fe)^(@)=-0.47V Fe^(3+) + e^(-) to Fe^(2+), E_(Fe^(3+)//Fe^(2+))^(@) = +0.77V

Answer»

–0.057 V
+ 0.30 V
– 0.30 V
+ 0.057 V

ANSWER :A
Discussion
14116.

Which of the following represents fusion reaction ?

Answer»

`""_(93)^(239)NPTO""_(94)^(239)Pu+""_(-1)^(0)e`
`""_(4)^(9)Be+""_(1)^(1)HTO""_(5)^(10)B+_(0)^(0)GAMMA`
`""_(1)^(2)H+""_(1)^(3)Hto""_(2)^(4)He+""_(0)^(1)n`
`""_(6)^(12)C+""_(1)^(1)Hto""_(7)^(13)N+gamma`

Answer :B
Discussion
14117.

Which of the following species are not coloured ? Cu(I), Ti(III), Fe(II), V(II), Cd(III), Zn(II).

Answer»

SOLUTION :The TRANSITION metal ions CONTAINING completely filled d-orbitals are generally white among these Cu(I), Cd(II) and ZN(II) are white,
Discussion
14118.

Which of the following carbohydrates is the essential constituent of cell wall?

Answer»

STARCH
cellulose
maltose
sucrose

Answer :B
Discussion
14119.

What is the shape of PCl_5 ?

Answer»

Pyramidal
Trigonal bipyramidal
Tetrahedral
Angular

Solution :
Discussion
14120.

Which of the following is the constituent of metal superoxides ?

Answer»

`O_(2)^(-)`
`O_(2)^(2-)`
`O^(2-)`
`O^(3-)`

ANSWER :A
Discussion
14121.

Which reaction can be used to prepare phosphoric acid ?

Answer»

`P_2O_3 + H_2O OVERSET (20^@ C) rarr`
`P_2O_3 + H_2O overset (80^@ C) rarr`
`P_2O_3 + H_2O overset (25^@ C) rarr`
`P+ HNO_3rarr`

Answer :D
Discussion
14122.

Write the structure of alpha-D(+) glucophyranose.

Answer»

SOLUTION :
Discussion
14123.

The standard reduction potentials of Ag, Cu, Co and Zn are 0.799, 0.337,-0.277 and 0.762V respectively. Which of the following cells will have maximum cell e.m.f.?

Answer»

`Zn//Zn^(2+)(1M) //Cu^(2+) (1M) //Cu`
`Zn//Zn^(2+) (1M)//AG^(+) (1M)//Ag`
`Cu//Cu^(2+) (1M) //Ag^(+) (1M) // Ag`
`Zn//Zn^(2+) (1M) // CO^(2+) (1M)//Co`

Answer :B
Discussion
14124.

What is the IUPAC name of [Cr(NH_(3))_(3)(H_(2)O)_(3)]Cl_(3) ?

Answer»

SOLUTION :Triaquatriammine CHROMIUM (III) CHLORIDE
Discussion
14125.

When ammonia reacts with sodium hypochlorite, product containing nitrogen is

Answer»

`N_(2)`
`N_(2)O`
`NH_(2)OH`
`H_(2)N. NH_(2)`

Answer :D
Discussion
14126.

The term infinite dilution refers for

Answer»

`alpha to 1` for weak ELECTROLYTES
an electrolytes is 100% DISSOCIATED
all inerionic effects disappear.
when equivalent CONDUCTANCE of an electrolyte becomes constant.

Answer :A::B::C::D
Discussion
14127.

Which of these species has same number of unpaired electrons with weak field as well as with strong field ligands.

Answer»

`TI^(2+)`
`Cr^(3+)`
`NI^(2+)`
All of these

Answer :D
Discussion
14128.

When acethlene (C_(2)H_(2)) gas is passed through red hot iron tube, it trimerises into benzene (C_(6)H_(6)) vapours .If the average mass of vapours coming out through the tube is 50, calculate the degree of trimerisation of acetylene.

Answer»


ANSWER :`0.72`
Discussion
14129.

Which among the following pairs of elements 'not' an example of chemical twins?

Answer»

ZR and Hf
Nb and Ta
Mo and W
Ta and Re

Answer :D
Discussion
14130.

Which of the following acids combines the properties of acid and aldehyde:

Answer»

Acetic ACID
FORMIC acid
BENZOIC acid
Oxalic acid

Answer :B
Discussion
14131.

Write net charging and discharging reactions for lead storage battery.

Answer»

Solution :For LEAD storage battery :
NET charging REACTION :
`2PbSO_(4(s))+2H_(2)O_((L))rarrPb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq))`
Net dischargingreaction :
`Pb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq))rarr 2PbSO_(4(aq))rarr 2PbSO_(4(s))+2H_(2)O_((l))`
Discussion
14132.

Write the structure of the following molecules : H_2SO_3

Answer»

SOLUTION :
Discussion
14133.

Which of the following is not an oxidation product of alkane?

Answer»

Alcohol
Aldehyde
Carboxylic acid
Ether

Solution :REFER to COMPREHENSIVE REVIEW.
Discussion
14134.

The wave number of the shortest wavelength transition in the Balmer series of H atom is

Answer»

`27419.5cm^(-1)`
`219356cm^(-1)`
`12186.2cm^(-1)`
`24372.4cm^(-1)`

SOLUTION :`barv=109678 [1/(n_(1)^(2))-1/(n_(2)^(2))]`
`n_(1)=2,n_(2)=OO`
`barv=109678 [1/(2^(2))-1/(oo^(2))]`
`=109678/4=27419.5cm^(-1)`
Discussion
14135.

Which of the following pairs of cations will turn borax beads blue in an oxidising flame?

Answer»

`Fe^(2+)` and `Co^(2+)`
`Co^(2+)` and `CU^(2+)`
`Cu^(2+)` and `MN^(2+)`
`Cu^(2+)` and `Cr^(3+)`

SOLUTION :`Fe^(2+), Co^(+2)`
Discussion
14136.

Write the name of component of starch which is water soluble.

Answer»

SOLUTION :AMYLOSE is WATER SOLUBLE.
Discussion
14137.

The stability of +1 oxidation state increases in the sequence

Answer»

`Al lt Ga lt In lt TL`
`Tl lt In lt Ga lt Al`
`In lt Tl lt Ga lt Al`
`Ga lt In lt Al lt Tl`

ANSWER :A::B::C::D
Discussion
14138.

Which reagent is used to convert butan -2- one to propionic acid ?

Answer»

TOLLEN's reagent
Fehling's SOLUTION
ACIDIC `KMnO_(4)`
PCC

ANSWER :C
Discussion
14139.

What are the concentration and percentage of Ag^+ion remaining after Ag_2CrO_4precipitates when 25 mL of 0.10 M AgNO_3is added to 25 mL of 0.10 M K_2 CeO_4 ?

Answer»

SOLUTION :`6.6 XX 10^(-6) M , 0.013%`
Discussion
14140.

Which of the following statements is not true about the oil-in-water type emulsion?

Answer»

On addition of SMALL amount of WATER, no separate layer of water appears
On addition of OIL, separate layer of oil is formed
Addition of an electrolyte causes the conductivity of the emulsion to increase
Addition of small amount of oil solute DYE readers the entire emulsion coloured

Answer :D
Discussion
14141.

The stability of dihaiides of Si, Ge, Sn and Pb increases steadlly in the sequence.

Answer»

`SiX_(2) lt lt GeX_(2) lt lt SnX_(2) lt lt PbX_(2)`
`PbX_(2) lt lt SnX_(2) lt lt GeX_(2) lt lt SiX_(2)`
`GeSX_(2) lt lt SiX_(2) lt lt SnX_(2) lt lt PbX_(2)`
`SiX_(2) lt lt GeX_(2) lt lt PbX_(2) lt lt SnX_(2)`

Solution :Due to the INERT PAIR effect (the reluctance of `NS^(2)` electrons of outermost SHELL to participate in bonding) the stability of `M^(2+)` IONS (of group 14 elements) increases as we go down the group.
Discussion
14142.

Two mole of alkyl iodide is formed when etherreact with

Answer»

HOT `I_2`
COLD HI
Cold `I_2`
Hot HI

Answer :D
Discussion
14143.

Which of the following have maximum number of isomers

Answer»

`[Co(NH_(3))_(4)]^(+)`
`[Ni(EN)(NH_(3))_(4)]^(+)`
`[Ni(C_(2)O_(4))(en)_(2)]^(0)`
`[Cr(SCN)_(2)(NH_(3))_(4)]^(+)`

Answer :D
Discussion
14144.

Which of the following is regenerated fibre?

Answer»

 Nylon
Nylon-6
 Rayon
Terylene

Answer :C
Discussion
14145.

Write the Nernst equation and emf of the following cells at 298 K: (i) Mg_((S))|Mg^(2+)(0.001M)||Cu^(2+)(0.0001M)|Cu_((S)) (ii) Fe_((S))|Fe^(2+)(0.001M)||H^(+)(1M)|H_(2(g))(1" bar")|Pt_((S)) (iii) Sn_((S))|Sn^(2+)(0.050M)||H^(+)(0.020M)|H_(2(g))(1" bar")|Pt_((S)) (iv) Pt_((S))|Br^(-)(0.010M)|Br_(2(l))||H^(+)(0.030M)|H_(2(g))(1" bar")|Pt_((S)).

Answer»

Solution :For the given reaction, the Nernst equation can be given as:
`E_(Mg^(2+)|Mg)^(THETA)=-2.37V`
`E_(Cu^(2+)|Cu)^(Theta)=+0.34V,E_(Sn^(2+)|Sn)^(Theta)=-0.14V`
`E_(Br^(2+)|Br^(-))^(Theta)=+1.08V,E_(FE^(2+)|Fe)^(Theta)=-0.44V`.
(i) Standard electrode POTENTIAL calculation:
Cell reactioin : `Mg_((S))+underset((0.0001M))(Cu^(2+))toMg^(2+)+underset((0.001M))(Cu_((S)))`
* In above cell reaction the concentration are not standard and its Nernst equation will be
`therefore E_(cell)^(Theta)=E_(Cu^(2+)|Cu)^(Theta)-E_(Mg^(2+)|Mg)^(Theta)`
`=0.34-(-2.37V)`
`=2.71V`
Where `[Mg^(2+)]0.001M and [Cu^(2+)]=0.0001M`
`therfore E_(cell)=2.71V+((0.0591)/(2))xxlog((0.0001M)/(0.001M))`
`=2.71+((0.0591)/(2))(LOG" "0.1)`
`=2.71+0.02955xx(-1.0)`
`=2.71-0.02955`
`=2.68045V~~2.68V`
`E_(cell)=E_(cell)^(Theta)-(0.0591)/(N)log(([Mg^(2+)])/([Cu^(2+)]))` where, n=2
`E_(cell)=E_(cell)^(Theta)+(0.0591)/(2)log(([Cu^(2+)])/([Mg^(2+)]))`
Discussion
14146.

Which ion would you expect to have the maximum splitting of - orbitals

Answer»

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

Answer :B
Discussion
14147.

Which of the following compound do not undergo aldol condensation

Answer»

`CH_(3)-CHO`
`C_(6)H_(5)-CHO`
`CH_(3)overset(O)overset(||) ( C) -CH_(3)`
`CH_(3)-overset(CH_3)overset(|)underset(CH_3)underset(|)C-CHO`.

Answer :B::D
Discussion
14148.

Which of the following carbocations will be the most stable ?

Answer»

`Ph_(3) C^(+)`
`(CH_(3)) _(2) CH^(+)`
`CH_(3) CH_(2) CH_(2) `
`CH_(2)= CH-CH_(2)^(+)

Answer :A
Discussion
14149.

What is meant by polymerization? Name the monomer used in the preparationof Polyvinyl Chloride (PVC).

Answer»

Solution :The process of FORMATION of POLYMERS from RESPECTIVE MONOMERS.
Vinyl chloride OR CHLOROETHENE.
Discussion
14150.

Which one of the following does not correctly represent the correct order of the property indicated against it?

Answer»

`TI lt V lt Cr lt Mn`, increasing number of oxidation states
`Ti^(3+) lt V^(3+) , Cr^(3+) lt Mn^(3+)` , increasing MAGNETIC moment
`Ti lt V lt Cr lt Mn` , increasing MELTING points
`Ti lt V lt Mn lt Cr`: increasing 2ND ionization enthalpy

Answer :C
Discussion