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18401.

Which of the following reactions are not feasible ?

Answer»

`Ph-OH+NaHCO_3toPh-O NA + CO_2+H_2O`
`Ph-COONa+Ph-OH to Ph-COOH+Ph-Ona`
`H-COOH+CH_3-ON a to H-COONa + CH_3OH`
`HC-=CH+NaOHtoHC-=C Na+H_2O`

SOLUTION :NA
Discussion
18402.

Which of the following complex will show geometrical as well as opitcal isomerism? (en= ethylendiamine )

Answer»

`[Pt(NH_(3))_(2)Cl_(2)]`
`[Pt(NH_(3))Cl_(4)]`
`[Pt(en)_(3)]^(4+)`
`[Pt(en)_(2)Cl_(2)]`

SOLUTION :
`[Pt(en)_(2)Cl_(3)]` show geometrical as WELL as OPTICAL isomerism.
Discussion
18403.

Which of the following is most likely to show optical isomerism

Answer»

`{:(""H),("|"),(HC-=C-C-C-=CH),("|"),(""Cl):}`
`{:(""H),("|"),(HC-=C-C-C-CH_(3)),("|"),(""Cl):}`
`{:(""H),("|"),(HC-=C-C-H),("|"),(""Cl):}`
`{:(""Cl),("|"),(HC-=C-C=CH_(2)):}`

Solution :`HC -= C-underset(Cl)underset(|)OVERSET(H)overset(|)(C)-CH_(3)` shows optical because ONE MOLECULE is unsymmetrical. That is called chiral CENTRE.
Discussion
18404.

Which among the following reactions is can be a example of pseudo first order reaction?

Answer»

INVERSION of cane sugar
Decomposition of `H_(2)O_(2)`
Conversion of cyclopropane to propene
Decomposition of `N_(2)O_(5)`

ANSWER :A
Discussion
18405.

Which one of the following represents Faraday's first law ?

Answer»

`m = ZL t`
`m = Z/(I t)`
`m = (I t)/Z`
`Z = ML t`

ANSWER :A
Discussion
18406.

Which compound is used as helminthicide for elimination of hookworms:

Answer»

`CH_4`
`CHCl_3`
`C_2H_2Cl_4`
`CCl_4`

ANSWER :D
Discussion
18407.

Which is most stable among above hydrides?

Answer»

SOLUTION :`NH_3` is the most STABLE HYDRIDE.
Discussion
18408.

Which of the following is a characteristic property of both mixtures and compounds?

Answer»

Their proporties are same as those of their components .
ENERGY is RELEASED when they are formed.
Their MASSES are equal to the sum of the masses of their components.
They contain the components in FIXED proportions.

Answer :C
Discussion
18409.

Toluene is oxidised to benzoic acid by ___________.

Answer»

`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`H_(2)SO_(4)`
both (a) and (B)

SOLUTION :
Discussion
18410.

Which of the following compound does not give positive Fehling's tset

Answer»

`CH_(3)CHO`

`H_(3)C-underset(O)underset(||)C-CH_(3)`
2 & 3 both

Answer :D
Discussion
18411.

Why vitamin C cannot be stored· in our body?

Answer»

SOLUTION :VITAMIN C is water soluble, therefore it is readily excreted in URINE and hence cannot be stored in the BODY.
Discussion
18412.

Which of the following is metalloid

Answer»

Pb
Zn
As
None of these

Answer :C
Discussion
18413.

The tendency of an electrode to lose electrons is known as

Answer»

Electrode potential
REDUCTION potential
Oxidation potential
E.M.F.

Solution :The magnitude of the electrode potential of a metal is a measure of its relative TENDENCY toloose or GAIN electrons. i.e., it is a measure of the relative tendency to undergo oxidation (LOSS of electrons) or reduction (gain of electrons).
`MtoM^(n+)+n e^(-)` (oxidation potential)
`M^(n+)+n e^(-)toM` (reduction potential).
Discussion
18414.

Which of these has a layered arrangement?

Answer»

`Cdl_(2)`<BR>Mg
KCl
`NH_(4)Br`

ANSWER :A
Discussion
18415.

Which can be used as monomer in a polymerisation reaction:

Answer»

`C_2H_6`
`C_2H_5Cl`
`C_2H_4`
`CH_3Cl`

ANSWER :C
Discussion
18416.

When is reduced with, the compound obtained will be

Answer»

`CH_(3) - CH_(2) -`COOH
`CH_(2) = CH - CH_(2)` OH
`CH_(3) - CH_(2) - CH_(2)`OH
`CH_(3) - CH_(2) - `CHO

Solution :Li`[AlH_(4)]` reduces the carboxylic ACID group to the ALCOHOL LEAVING the unsaturation unaffected.
`CH_(3) "COOH" + PCl_(5) rarr "COCl" UNDERSET("Anhy AlCl"_(3))overset(C_(6)H_(6))(rarr) C_(6) H_(5) - COCH_(3)`
Discussion
18417.

The three states of matter are solid, liquid and gas. Which of the following statements are correct about them ?

Answer»

GASES and LIQUIDS have viscosity as a COMMON property
The molecules in all the three states POSSESS random translational motion
Gases cannot be converted into solids without passing through the liquid phase.
Solids and liquids have VAPOUR pressure as a common property

Answer :A
Discussion
18418.

Which one is bidentate ligand:

Answer»

`C_2O_4^(2-)`
`NH_2CH_2CH_2NH_2`
Both
None

Answer :C
Discussion
18419.

Which of the following expkains the increase of reaction rate by a catalyst?

Answer»

Catalyst provides the necessary energy to the colliding molecules to CROSS the barrier
Catalyst decreases the rate of backward reaction so that the rate of forward reaction INCREASES
Catalyst decreases the enthalpy change of the reaction
Catalyst provides an ALTERNATIVE PATH of lower activation energy.

ANSWER :D
Discussion
18420.

When dry Cl_(2) is treated with dry slaked lime the product formed is

Answer»

BLEACHING POWDER
chloropicrin
phosgene
TEAR gas

Answer :A
Discussion
18421.

What is EAN rule ?

Answer»

Solution :‘Every central metal atom or ion in a complex has a tendency to acquire effective atomic NUMBER (EAN) of next inert gas.’EAN of metal in- a complex = At. No. - Oxidation state `+2x X` COORDINATION number.
Ex.: EAN of Fe in `K_4 |Fe (CN)_6]` =(26 - 2) + 2 x 6 = 36 (At. No. of Krypton)
Discussion
18422.

Which is the incorrect statement in the following ?

Answer»

Calamine and siderite are carbonates
Argentite and cuprite are oxides
Zinc belnde and iron pryites are sulphides
Malachite and AZURITE are ORES of copper

Answer :B
Discussion
18423.

Which factor/s will increase the reactivity of gt C =O group (i) Presence of a group with positive inductive effect (ii) Presence of a group with negative inductive effect (iii) Presence of large alkyl group

Answer»

Only (i)
Only (ii)
(i) and (III)
(ii) and (iii)

Solution :The reactivity of the carbonyl group towards the addition reaction depends upon the magnitude of the positive charge on the carbonyl carbon ATOM. Hence, any substituent that INCREASES the +ve charge on the carbonyl carbon must increase its reactivity towards addition REACTIONS. the introduction of negative group `(-I` effect) increase the reactivity while introduction of alkyl group `(+I` effect) decreases the reactivity. Large and bulky group CREATES hindrance in approach towards carbonyl carbon. so, large alkyl group decreases the reactivity of `gt C = O` group.
Discussion
18424.

Which of the following can exhibit tautomerism:

Answer»




ANSWER :D
Discussion
18425.

The spin only magnetic moment of Tetrachloridomaganate (II) ion is 5.9BM. On the basis of VBT, predict the type of hybridisation and geometry of the compound.

Answer»

Solution :`[MnCl_(4)]^(2-)`
Electronic configuration of `Mn` atom
Electronic configuration of `Mn^(2+)` ion
Hybridisation and formation of `[MnCl_(4)]^(2-)` complex
`Cl^(-)` isweak field ligand no electrons pairing occurs.
`sp^(3)` hybridisation
It has `5` unpaired electrons. Hence paramagnetic
Magentic moment,
`mu_(s)=sqrt(n(n+2))BM`
`n=5`
`mu_(s)=sqrt(5(5+2))=sqrt(5(7))`
`=sqrt((35))=5.9BM`
It has TETRAHEDRAL geometry.
Discussion
18426.

Which of the following reactions end in finite time….

Answer»

0 order
`1^(ST)` order
`2^(nd)` order
`3^(rd)` order

Answer :C
Discussion
18427.

What happens when: (i) n-butyl chloride is treated with alcoholic KOH.

Answer»

Solution :`UNDERSET(n-"butyl chlorid")(H_(2)C-CH_(2)-CH_(2)-CH_(2)Cl+alc.KOH)rarrunderset(1-"butene")(H_(3)C-CH_(2)-CH=CH_(2))`
Discussion
18428.

Total number of d electrons present in an element with atomic number 78 is :-

Answer»

8
58
29
38

Solution :Atomic NUMBER 78
`Sc"" - ""_(30)Zn "" 3d e^(-)"" -"" 10`
`Y ""- ""_(48)CD"" 4d e^(-) ""- ""10`
`La"" - ""_(80)Hg "" 5D e^(-)"" - ""10`
Discussion
18429.

Which of the following alloy does not contain Copper?

Answer»

Nichrome
Bronze
Brass
German Silver

Answer :A
Discussion
18430.

Which of the folloing is ore extracted from sulphide ores?

Answer»

Cu
Ag
PB
Zn

Solution :Cu, Ag, Pb & Zn can be EXTRACTED from their SULPHIDE ORES.
Discussion
18431.

The waste solution from Kipps apparatus when evaporated and crystallized gives

Answer»

`ZnSO_(4)`
`FeSO_(4)`
`Al_(2)(SO_(4))_(3)`
`Na_(2)SO_(4)`

Solution :`FeS+H_(2)SO_(4)rarrFeSO_(4)+H_(2)Suarr`
Discussion
18432.

Which of the following reactions correctly represent the major product(s)?

Answer»




`CH_(3)-CH=CH-overset(O)overset(||)C-OH underset(2.I_(2)//"C"Cl_(4)//DELTA)overset(1. AGOH)rarr CH_(3)-CH=CH-I`

ANSWER :A::C
Discussion
18433.

Which is not shown by sols?

Answer»

Adsorption
Tyndall effect
Flocculation
Paramagnetism

Answer :D
Discussion
18434.

What are the coordination numbers of Cs^+ and Cl^- in CsCl lattice ?

Answer»

SOLUTION :COORDINATION number of CS+ = 8 Coordination number of Cl- = 8
Discussion
18435.

What happens whenn-butyl chloride is treated with alcoholic KOH,

Answer»

Solution :`UNDERSET("n-butyl Chloride")(CH_(3)-CH_(2)-CH_(2)-CH_(2))-Cl overset(" KOH ")underset(" ETHANOL ")RARR underset("But-1-ene")(CH_(3)CH_(2)CH=CH_(2))`
Discussion
18436.

Write the names and structures of monomers in the following polymers: (a) Nylon 6, 6 (b) Buna-S

Answer»

Solution :(a) Nylon 6, 6
Monomers of Nylon 6, 6 are
`underset("ADIPIC acid")(HOOC(CH_(2))_(4)COOH) and underset("Hexamethylene DIAMINE")(H_(2)N(CH_(2))_(6)NH_(2))`
(b) Buna-S
`underset("1-3-Butadiene")(CH_(2)=CH-CH=CH_(2))` and
Discussion
18437.

Which of the following molecules have bond order greater than one but less than two?

Answer»

`CO_(3)^(2-)`
`HCO_(2)^(-)`
`NO_(3)^(-)`
`NO^(+)`

SOLUTION :
Discussion
18438.

Which of the following molecule exhibit P_(pi)-P_(pi) bonding?

Answer»

`CO_(3)^(-2)`
`NO_(3)^(-1)`
`SiO_(2)`
(1) & (2) both

Solution :
oxidation state = 0, COVALENCY =2
Discussion
18439.

Whencopper ore ismixedwithsilica,in areverberatoryfurnace,copper matte isproduced. Thecoppermattecontains ...... .

Answer»

SULPHIDES ofcopper(II) andiron (II)
sulphidesofcopper(II) andiron (III)
sulphidesofcopper(I) and IRON(II)
sulphides ofcopper(I) andiron (III)

SOLUTION :Matteconsistsof`Cu_2S+FeS, `i.e.,option(C ) ISCORRECT.
Discussion
18440.

Which pair is identical ?1

Answer»




Solution :Both are identical SPECIES `H_(3)C-overset(underset(|)(CH_(3)))(C)H-CI` in 1, there is no asymmetric CARBON ATOM present.
2, 3, 4 have pairs of compounds which have chiral carbon and are NON superimposible on each other .
Discussion
18441.

Which of the following compound is like metallic copper in its conductivity and appearance?

Answer»

`VO_(3)`
`TiO_(3)`
`ReO_(3)`
`CrO_(2)`

Solution :Rhenium OXIDE `ReO_(3)` is like METALLIC COPPER in CONDUCTIVITY.
Discussion
18442.

Which are used as secondary reference electrodes :

Answer»

CALOMEL ELECTRODE
`Ag//AgCI` electrode
`Hg/Hg,CI,-KCI`electrode
All of these

ANSWER :D
Discussion
18443.

What is a plasticizer?

Answer»

Solution :Organic COMPOUNDS which when ADDED to plastics make them soft and WORKABLE are called plasticizers. For example, n-butyl phthalate, di-n-octyl phthalate and cresyl triphosphate.
Discussion
18444.

Which of the following forms cationic micelles above certain concentrations ?

Answer»

sodium dodecyl SULPHATE
UREA
Sodium ACETATE
Cetyl TRIMETHYL ammonium bromide

Answer :D
Discussion
18445.

The standard electrode potentials E^(@) for the half cell reactions are as :ZntoZn^(2+)+2e^(-),E^(@)=0.76VFetoFe^(2+)+2e^(-),E^(@)=041VThe EMF of the cell reaction Fe^(2+)+ZntoZn^(2+)+Feis :

Answer»

`Zn_((aq))^(+2)+2Ag_((s))to2Ag_((aq))^(+)+Zn_((s))`
`Zn_((s))+2Ag_((aq))^(+)toZn_((aq))^(+2)+2Ag_((s))`
`Az_((aq))^(2+)+Ag_((aq))^(+)toZn_((s))+Ag_((s))`
`Az_((s))+Ag_((s))toZn_((aq))^(+2)+Ag_((aq))^(+)`

Solution :`Zn_((s))+2Ag_((aq))^(+)toZn_((aq))^(+2)+2Ag_((s))`
EMF for EQ. (2) is +ve, and hence the RELATION is
`Zn_((s))+2Ag_((aq))^(+)toZn_((aq))^(+2)+2Ag_((s))`.
Discussion
18446.

Which of the following compounds contain amide functional group ?

Answer»

`CH_(3)CH_(2)NHCH_(3)`
`CH_(3)N(CH_(3))_(2)`
`CH_(3)CH_(2)-CO-NH_(2)`
`CH_(3)-underset(NH_(2)"")underset(|"")(CHCOOH)`.

Solution :`RCONH_(2)` is an amide `-CONH_(2)` represents amide GROUP.
Discussion
18447.

Which of the following is attacking species in conversion Y to P ?

Answer»

`C Cl_(2)`
`: CHCl`
`:CH_(2)`
`CH_(2)Cl`

ANSWER :A
Discussion
18448.

Which of the following is not correct matched :

Answer»


ANSWER :D
Discussion
18449.

Using VB theory, explain the type of hybridisation , geometry , magnetic property and magnetic moment of [Fe(CN)_(6)]^(3-)

Answer»

SOLUTION :
Discussion
18450.

Which of the following hydro carbon has the most electronegative carbon atom ?

Answer»

butane
1-butene
1-butyne
2-butyne

Answer :C
Discussion