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13751.

Which of the following is not polyhalogen compound ?

Answer»

Chloroform
Freon
Carbon TETRACHLORIDE
Chloro benzene

SOLUTION :CHLOROBENZENE
Discussion
13752.

What is cell potential of cell ""^(Theta)Ni|Ni_((1M))^(2+)||Au_((1M))^(3+)|Au^(o+) ? [E_(Ni^(2+)|Ni)^(o)=-0.25V,E_(Au^(3+)|Au)^(o)=1.5V]

Answer»

`+1.75V`
`+1.25V`
`3.25V`
`-1.75V`

SOLUTION :`+1.75V`
Discussion
13753.

Which of the followingis notan actinide ?

Answer»

URANIUM
Curium
Californium
Erbium

Answer :D
Discussion
13754.

What are the monomers of Nylon-6,6 ?

Answer»

Hexanoic ACID and hexamethylene DIAMINE.
Hexane-1,6-dioic acid and hexane-1,6-diamine.
Hexane-1, 6-dioic acid and hexane 1,2-diamine.
ADIPIC acid and hexane amine.

SOLUTION :Hexane-1,6-dioic acid and hexane- 1,6-diamine.
Discussion
13755.

The stainless steel developed in India contains the following special components

Answer»

Cobalt
CHROMIUM
Manganese
Aluminium

Solution :Stainless STEEL CONTAINS `Cr_2O_3` layer for protectoin
Discussion
13756.

Which of the following is most stable alkene ?

Answer»

`CH_(3)CH = CH_(2)`
`(CH_(3))_(2) C = C (CH_(3))_(2)`
`CH_(3)CH = CHCH_(3)`
`CH_(2) = CH_(2)`

ANSWER :B
Discussion
13757.

Which one of the following is an example of conductor?

Answer»

PVC
BAKELITE
Aluminium
RUBBER

ANSWER :C
Discussion
13758.

What is the primary structural feature necessary for a molecule to make it useful in a condensation polymerizationreaction?

Answer»

Solution :Condensation polymerization involves a repititive condensation reaction between two bifunctional monomers. The reaction results in the loss of some simple molecule such s as water, alcohol, etc. in such a way that the PRODUCT of reaction at each step is again a bifunctional compound. HENCE, the sequence of condensation goes on resulting in the formation of polymer.
Discussion
13759.

Which is least basic ? SbH_(3)PH_3,NH_3,AsH_3

Answer»

SOLUTION :`SbH_(3)`is LEAST basic because basic character of hydrides of group 15 elements DECREASES and acidic character increases down the group.
Discussion
13760.

Which of the following sets of monosaccharides forms sucrose ?

Answer»

`alpha`-D-galactopyranose and `alpha`-D-glucopyranose
`alpha`-D-glucopyranose and `BETA`-D-fructofuranose
`beta`-D-glucopyranose and `alpha`-D-fructofuranose
`alpha`-D-glucopyranose and `beta`-D-fructopyranose

Solution :In SUCROSE , `C_(1)-alpha` of D-glucopyranose is CONNECTED to `C_(2)-beta` of fructofuranose.
Discussion
13761.

What is meant by Piezo electricity ?

Answer»

Solution :Piezo electricity is the appearance of an electrical potential across the sides of a crystal. When you subject it to MECHANICAL stress. The word piezo electricity means electricity resulting from pressure and LATENT heat. EVEN the inverse is possible which is KNOWN as inverse piezo electric effect.
Discussion
13762.

What is one a.m.u. or one 'u'?

Answer»

Solution :1 a.m.u. or `u=(1)/(12)th` of the MASS of an ATOM of CARBON - 12.
Discussion
13763.

Using valence bond theory account for the geometry and magnetic nature of [NiCl_(4)]^(2-) ion. ("Atomic number of Ni "= 28).

Answer»

Solution :In the given complex ion central METAL is nickel with electronic configuration `[Ar]^(18)3d^(8)4s^(2)`
Nickel is in `+2` oxidation state THEREFORE electronic configurations is `Ni^(+2)`

In the given complex, `CN-` is a strong ligand. On the APPROACH of strong ligand the unpaired 3d electron will get pair up. As a result one d - orbital BECOMES vacant.

The one vacant 3d orbital, one vacant 4s orbital and two vacant 4p orbitals hybridize to give four hybrid orbitals.

Four pairs of electrons one from each `CN-` molecule occupy the geometry is square planar it is diamagnetic complex due to the absence of unpaired electrons.
Discussion
13764.

Which of the following polymers can have strong intermolecular forces ?

Answer»

NYLON
Polystyrene
Rubber
Polyesters

Answer :A::D
Discussion
13765.

What is molal elevation constant of a solvent ?

Answer»

SOLUTION : The elevation in boiling point of a solvent DUE to addition of 1 mole of none-volatile solute to 1000 gm. Of solvent is CALLED molal elevation constant or EBULLIOSCOPIC constant .
Discussion
13766.

Which form is cyclic trimer of SO_(3)

Answer»

`GAMMA`
`BETA`
`ALPHA`
both `alpha and beta`

ANSWER :A
Discussion
13767.

Which of the following compound(s) is (are) resolvable?

Answer»




SOLUTION :A cannot be RESOLVED DUE to PYRAMIDAL INVERSION
Discussion
13768.

Which is (are) ore (s) of almun num?

Answer»

Cryolite
Buite
Malachite
Cupeite

Solution :Cryolite `Na_(3)AlF_(6)`, (B) BAXUITE `:Al_(2)O_(3),2H_(2)O:` (c) Malachite `:CuCO_(3).Cu(OH)_(2),` (d) CUPRITE `: Cu_(2)O`
Discussion
13769.

Under which situations can an amorphous substance change to crystalline form ?

Answer»

SOLUTION :An AMORPHOUS solid can be changed to crystalline solid by SLOWLY heating and cooling over a LONG period of TIME.
Discussion
13770.

Whichof the followingis leastbasicinaqueousmedium ?

Answer»




ANSWER :B
Discussion
13771.

Which on ehas maximum solubility in liquid Ccl_4:

Answer»

`Cl_2`
`I_2`
NACL
`Br_2`

ANSWER :B
Discussion
13772.

Which is the most stable carbocation ?

Answer»




SOLUTION :
`3^(@)` CARBOCATION is more STABLE.
Discussion
13773.

Which of the following statements in most likely to be incorrect

Answer»

`Ti(NO_(3))_(4)` is a colourless compound
`[Cu(NC.CH_(3))_(4)]^(2+)` is a colourless compound
`[CR(NH_(3))_(6)]^(3+)3Cl^(-)` is a coloured compound
`K_(3)[VF_(6)]` is a colourless compound

Solution :Complex species in which the metal has UNPAIRED electrons are MOSTLY coloured, but the converse may not be TRUE `LnK_(3)[VF_(6)]` the central metal atom has two unpaired electrons. So it is mostly coloured. `(V^(3+):t_(2g)^(2)eg^(0))`
Discussion
13774.

wurtz reaction using bromoethane yields:

Answer»

2-bromobutane
n-butane
isobutane
ethane

Answer :B
Discussion
13775.

Which of the following amines cannot be prepared by Gabriel phthalimide synthesis ?

Answer»

sec-Propylamine
tert-Butylamine
2-Phenylethylamine
N-Methyl BENZYL amine

Answer :A::B::D
Discussion
13776.

XeF_(6)+SiO_(2) rarr [A] Oxidation state of Xe in [A]

Answer»

6
8
5
4

Solution :`2XeF_(6)+ SiO_(2) RARR OVERSET(+6)(2XeOF_(4)) + SiF_(4)`
Discussion
13777.

Which of the following is non-electrolyte.

Answer»

`NACL`
`CaCl_2`
`C_12H_22O_11`
`CH_3COOH`

SOLUTION :`C_12H_22O_11` is a SUGAR and non-electrolyte.
Discussion
13778.

Which of the following graphs represents exothermic reaction?

Answer»

i) only
II) only
iii) only
i) and ii)

ANSWER :A
Discussion
13779.

Write one reaction using alkaline KmnO_4.

Answer»

SOLUTION :`UNDERSET("")(CH_(2) = CH_2) + H_2O + O overset("Alkaline")underset(KMnO_4) rarr {:(CH_2OH),(|),(CH_2OH),("ETHYLEN GLYCOL"):}`
Discussion
13780.

Which of the following orders regarding the basic strength of substituted anline is correct?

Answer»

p-methylaniline`GT`p-chloroaniline `gt`p-aminoacetophenone
p-methylaniline`gt` p-aminoacetophenone `gt` p-chloraoniline
p-aminoacetophenone `gt` p-methylaniline `gt` p-chloroanline
p-amonoacetophenone `gt` p-chloroaniline `gt` p-methylaniline

ANSWER :A
Discussion
13781.

Which halogen can replace iodine from KI:

Answer»

`F_2`
`Cl_2`
`Br_2`
All

Answer :D
Discussion
13782.

When steam is passed over red hot iron, the products formed are

Answer»

`Fe_2O_3+H_2O`
`Fe_3O_4+H_2`
`Fl_2O_3+H_2`
FEO+`H_2`

ANSWER :B
Discussion
13783.

What is the significant of van't Hoff factor ?

Answer»

SOLUTION :Van.t Hoff factor is a factor that shows the extent of DISSOCIATION or association of solute particles in solution.
i= (NORMAL molar MASS of the solute )/(Observed molar mass of the solute)
For solute that are non-electrolytes, i=1
For SOLUTES that dissociates, `i gt 1`
For solutes that undergo association, `i lt 1`
Discussion
13784.

Which one of the following statements is wrong ?

Answer»

The electrode potential is called standard electrode potential if the electrode is set up in 1 M solution at 298 K
The electrode potential of
Pt `H_(2 "(1 atm)") | H^(+) (1M)` is TAKEN as zero
Metals which have higher standard electrode potential than N.H.E. REACT with 1 M `H_(2)SO_(4)` to give `H_(2) ` gas
Greater the oxidation potential of a METAL , more ACTIVE is the metal .

Solution :Metals with higher oxidation potential (lower reduction potentials) react with acids to give `H_(2)` gas .
Discussion
13785.

Which of the following give ppt. with H_(2)S only in alkaline medium?

Answer»

`Co^(2+)`
`Pb^(2+)`
`Cu^(2+)`
`Bi^(3+)`

SOLUTION :Salts that GIVES Black precipitation with `H_(2)S` in alkaline mediumis CoS, NIS.
Discussion
13786.

Tin is extracted from tin stone by heating it in a furnace with:

Answer»

`CaCO_3`
`CAO`
`STEAM`
`COKE`

ANSWER :D
Discussion
13787.

Which of the following fc c structure contains cations in alternate tetrahedral voids ?

Answer»

`NACI`
`ZNS`
`Na_(2)O`
`CaF_(2)`

ANSWER :B
Discussion
13788.

The temperature of the system decreases in an

Answer»

Adiabatic compression
Isothermal compression
Isothermal expansion
Adiabatic expansion

Solution :When a real gas is forced through a porous plug into a region of LOW pressure, it is FOUND that due to expansion, the gas on the side of low pressure gets cooled.
The phenomenon of PRODUCING lowering of temperature when a gas is made to EXPAND ADIABATICALLY from a region of high pressure into a region of low pressure is known as Joule-Thomson effect.
Discussion
13789.

Which pair will show common ion effect?

Answer»

`BaCl_(2)+BA(NO_(3))_(2)`
`NaCl+HCl`
`NH_(4)OH+NH_(4)Cl`
`AgCN+KCN`

SOLUTION :`NH_(4)OH+NH_(4)Cl`
Discussion
13790.

Two liquids A and B are miscibnle over the whole range of compsition and may be treated as ideal. At 350 K, the vapour pressure of pure liquid A is 24.0 kPa and that of pure liquid B is 12.0 kPa. A miozture of 60% of A and 40% of B is distilled at this temperature. What is the pressure in a colse contaiunbiner from which arir is excluded ? A small amount of distillate is collected and redistilled at the same temperature. What is the compositon os the second distillate ?

Answer»


Solution :Step I. CALCULATION of the pressure in the distillation apparatus.
`"For liquid A":""x_(A)=0.60" and "P_(A)^(@)=24.0 kP_(a)`
`"For liquid B":""x_(B)=0.40" and "P_(B)^(@)=12.0 kP_(a)`.
`"Partial pressure of A in the liquid mixture "(P_(A))=P_(A)^(@)P_(A)=(24.0kP_(a))xx(0.60)=14.4 kP_(a)`
`"Partial pressure of A in the liquid mixture "(P_(B))=P_(B)^(@)x_(B)=(12.0kP_(a))xx(0.40)=4.8 kP_(a)`
`"Total pressure in the flask "=14.4+4.8=19.2 kP_(a)`
Step II. Calculation of the composition of the second distillate.
`"Form the second distillate, only liquid A will distil since it is LOW boiling as is evident from its higher vapour pressure "(24kP_(a)) "COMPAREDTO the liquid B "(12 kP_(a))`.
`"Mole fraction of A in the vapoure state "(x'A)=((14.4kP_(a)))/((19.2kP_(a)))=0.75`
`"Mole fraction of B in the vapoure state "(x'B)=(1-0.75)=0.25`
`"Partial pressure A in the maxiture "(P'_(A))=P_(A)^(@)x_(A)=24xx0.75=18kP_(a).`
`"Partial pressure B in the maxiture "(P'_(B))=P_(B)^(@)x_(B)=12xx0.25=3 kP_(a).`
`"Mole fraction of A in the second distilatte"=P_(A)^(@)/(P'_(A)+P'_(B))=(18kkP_(a))/(21 kP_(a))=0.857`
Thus, the second distillate will contain only 85.7% of A.
Discussion
13791.

Volume of 0.1 M K_(2)Cr_(2)O_(7) required to oxidise 35 mL of 0.5 M Fe SO_(4) solution is

Answer»

29.2 mL
17.5 mL
175 mL
145 mL

Solution :`(({:(K_(2)Cr_(2)O_(7)+4H_(2)SO_(4)toK_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+4H_(2)O+3[0]),(2FeSO_(4)+H_(2)SO_(4)+[O]toFe_(2)(SO_(4))_(3)+H_(2)Oxx3):})/(K_(2)Cr_(2)O_(7)+7H_(2)SO_(4)+6FeSO_(4)toK_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+7H_(2)O+3Fe_(2)(SO_(4))_(3)))/`
`(M_(1)V_(1))/(n_(1) = (M_(2)V_(2))/(n_(2))`
`(K_(2)Cr_(2)O_(7) = (FeSO_(4))`
`(0.1xxV_(1))/(1)=(0.5xx35)/(6xx0.1)`
`V_(1) = (0.5xx35)/(6xx0.1)=29.2 mL`
Discussion
13792.

Write the partial structure of i) Polythene ii) Neoprene.

Answer»

Solution :PARTIAL structures of
i) Polythene `rarr(-CH_(2)-CH_(2))_(N)`
ii) Neoprene `rarr(CH_(2)-C=CH-CH_(2))_(n)`
Discussion
13793.

When an aqueous solution of thylamine and iron (III) chloride are mixed

Answer»

a COLOURLESS solution is formed
brown precipitate is formed
violet coloured solution is formed
a black precipitate is formed.

Solution :`[C_(2)H_(5)overset(+)(N)H_(3)]OH^(-)+FeCl_(3) rarr 3[C_(2)H_(5)overset(+)(N)H_(3)]Cl+underset("Brown PPT.")(FE(OH)_(3))`
Discussion
13794.

Which of the following controls carbohydrate metabolism and modulates inflammatory reactions ?

Answer»

ADRENALINE
EPINEPHRINE
NOREPINEPHRINE
GLUCOCORTICOIDS

SOLUTION :Glucocorticoids
Discussion
13795.

What is the action of heat on the following : (i) KClO_(3), (ii) KClO_(4), (iii) KNO_(3) (iv) KMnO_(4), (v) K_(2)Cr_(2)0_(2)?

Answer»

Solution :(i) `2KClO_(3) underset(MnO_(4))overset("heat" (420K))to2KCl + 3O_(2)`
(In theabsenceof `MnO_(2)` , THEDECOMPOSITIONOF `KClO_(3)` takesplace at 670- 720 K)
(ii) `2KClO_(4) overset("heat")to 2KCl + 4O_(2)`
(iii) `2KNO_(3) overset("heat")to 2KNO_(2) + O_(2)`
(iv) `2KMnO_(4)overset("heat")to K_(2)MnO_(4) + MnO_(2) + O_(2)`
(v)Potassium DICHROMATE, `K_(2)Cr_(2)O_(7)` on heatingliberates dioxygen.
`2K_(2)Cr_(2)O_(7)overset("heat")to 2K_(2)O + 2Cr_(2)O_(3) + 3O_(2)`
Discussion
13796.

The solubilityof Mg(OH)_(2) is increased by additionof NH_(4)^(+) ion . Calculate (i) K_(c)for the reaction , Mg(OH)_(2) + 2NH_(4) hArr 2NH_(3) +2H_(2)O + Mg^(2+) (ii)Find solubilityof Mg(OH)_(2)in a solutioncontaining0.5 M NH_(4)Cl(K_(spMg[(OH)_(2)] ) = 1.0 xx10^(-11) , K_(b)= 1.8 xx10^(-5))

Answer»

SOLUTION :(i)`3.08 XX 10^(-2)` (II) `0.123 M `
Discussion
13797.

Which two of the following are used for preparing iodised salt? (i) KIO_(3) (ii) KI (iii) I_(2) (iv) HI

Answer»

(i) and (II)
(i) and (III)
(ii) and (IV)
(iii) and (iv)

ANSWER :B
Discussion
13798.

Which of the following statement(s) is (are) correct when a mixture of NaCl and K_(2)Cr_(2)O_(7) is gently warmed with conc. H_(2)SO_(4)?

Answer»

A DEEP red vapour is evolved.
The vapour when passed through NaOH solution, gives a yellow solution.
Chlorine gas is also evolved.
Chromyl chloride is formed.

Solution :This is a chromyl chloride test.
`K_(2)Cr_(2)O_(7)+6H_(2)SO_(4)+4NaCl rarr 2KHSO_(4)+4NaHSO_(4)+UNDERSET("(orange red vapour)")underset("chromyl chloride")(2CrO_(2)Cl_(2))+3H_(2)O`
`4NaOH+CrO_(2)Cl_(2)rarr underset("(yellow)")(Na_(2)CrO_(4))rarr2NaCl+2H_(2)O`
Discussion
13799.

Which of the following will liberate iodine on treatment with KI solution ?

Answer»

`N_2`
`Cl_2`
`H_2`
`He`

SOLUTION :`Cl_2 + 2KI to 2KCL + I_2`
Discussion
13800.

Which of the following set of species are diamagnetic?

Answer»

`S_(3),S_(8),S_(6)`
`O_(3),S_(3),S(2)`
`P_(4),N_(2),O_(2)`
`Na_(2)ZnO_(2),KO_(2),ClO_(2)`

SOLUTION :`S_(3),S_(6)" and " S_(8)` all are diamagnetic.
Discussion