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901.

What is the role of benzoyl peroxide in addition polymerization of alkenes ? Explain l its mode of action with the help of an example.

Answer»

Solution :Role of benzoyl peroxide is to initiate the free RADICAL polymerization reaction, that can be easily understood by taking an example of polymerization of ethene to polyethene.
(i) Chain initiation step :

(iii) Chain terminator step :
`2C_(6)H_(5)(--CH_(2)CH_(2)--)_(n)overset(*)CH_(2)rarrC_(6)H_(5)(--CH_(2)-CH_(2)--)_(n)`
`underset("Polythene")(-CH_(2)CH_(2)CH_(2)CH_(2))(--CH_(2)-CH_(2)--)_(n)C_(6)H_(5)`
Discussion
902.

When one of ampere current flows for 1 sec through a conductor, this quantity of electricity is known as:-

Answer»

Faraday
Coulomb
E.M.F.
Ohm

Answer :B
Discussion
903.

Which of the following is correct for P_4 molecule of white phosphorus ?

Answer»

It has 6 LONE PAIRS of electrons.
It has six P-P SINGLE bonds.
It has THREE P-P single bonds.
It has FOUR lone pairs of electrons.

Solution :
Discussion
904.

What is the [OH^(-)] in the final solution prepared by mixing 20.0ml of 0.50 M HCl with 30.0 ml of 0.10 M Ba(OH)_(2)

Answer»

0.10 M
0.40 M
0.0050 M
0.12 M

Solution :No. of milli equivalent of `HCl = 20 XX 0.05 = 1.0`
No. of milli equivalent of
`BA(OH)_(2) = 30 xx 0.10 xx 2 = 6.0`
After neutralization, no. of milli equivalents in 50 ML. of solution = (6-1) = 5
No. of milli equivalent of `OH^(-)` is 5 in 50 ml.
`[OH^(-)] = (5 xx 100)/(50) xx 10^(-3) = 0.1M`
Discussion
905.

Write the reactions taking place in anode and cathode of a mercury button cell. Give the over all redox reaction of the cell with the emf generation.

Answer»

Solution :(i) OXIDATION occurs at anode :
`overset(0)(Zn_((s)))+underset("from KOH")(2OH_((aq))^(-)) rarr overset(+2)(ZnO_((s)))+H_(2)O(L)+2e^(-)`
(ii) REDUCTION occurs at cathode :
`overset(+2)(HgO_((s)))+H_(2)O(l)+2e^(-) rarr overset(0)(HG(l))+2OH_((aq))^(-)`
(iii) Overall reaction :
`Zn_((s))+HgO_((s)) rarr ZnO_((s))+Hg(l)`
(iv) Cell emf : about 1.35 V.
Discussion
906.

Write the structure of the product when chlorobenzene is treated with methyl chloride in the presence of sodium metal and bry ether.

Answer»

SOLUTION :
Discussion
907.

The simplest formula of a compound containing 32.5% K, 0.839% H, 26.7% S and 39.9% O is

Answer»

`KHSO_4`
`KHSO_3`
`K_2SO_4. 2H_2O`
`KHSO_2`

SOLUTION :
FORMULA of COMPOUND `= KHSO_3`
Discussion
908.

Which of the following will he most readily dehydrated in acidic conditions?

Answer»




Solution :Aldols, i.e. `BETA`-hydroxyaldehydes or `beta`-hydroxyketones readily undergo dehydration to FORM `alpha, beta`-unsaturated ALDEHYDES or KETONES.
Discussion
909.

The standard EMFfor the given cell reaction Zn+Cu^(2+)toCu+Zn^(2+) is 1.10V at 25^(@)C. The EMF for the cell reaction, when 0.1M Cu^(2+) and 0.1M" "Zn^(2+) solution are sued, at 25^(@)C is

Answer»

1.10V
0.110V
`-1.10V`
`-0.110V`

Solution :`E_(cell)=(E_(cell)^(o)-(0.059)/(2)"LOG"((ZN^(++)))/(CU^(++)))`
`=1.10-(0.059)/(2)"log"(0.1)/(0.1)=1.10V`
Discussion
910.

Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition but not using the Bronsted-Lowry definition

Answer»

`2NH_(3) + H_(2)SO_(4) hArr 2NH_(4)^(+) + SO_(4)^(2-)`
`NH_(3) + CH_(3)COOH hArr NH_(4)^(+) + CH_(3)COO^(-)`
`H_(2)O + CH_(3)COOH hArr H_(3)O^(+) + CH_(3)COO^(-)`
`[Cu(H_(2)O)_(4)]^(2+) + 4NH_(3) hArr [Cu(NH_(3))_(4)]^(2-) + 4H_(2)O`

SOLUTION :It involves gain and LOSS of electron pair (LEWIS concept).
Discussion
911.

Which of the following country is responsible for releasing largest amount of greenhouse gases

Answer»

Russia
Brazil
Germany
America (USA)

SOLUTION :Because USA is the LARGEST consumer of FUEL ENERGY
Discussion
912.

Why are Zn, Cd and Hg normally not regarded as transition elements ?

Answer»

SOLUTION :This is because NEITHER the ELEMENTS nor their IONS have INCOMPLETE d-orbitals.
Discussion
913.

Which are insecticides

Answer»

Baygon
Savine
Methoxy chlor
All of these

Solution :All are INSECTICIDES.
Discussion
914.

Write the structures of the following species : (i) H_3PO_2 (ii) H_2SO_5

Answer»

SOLUTION :The STRUCTURES of `H_3PO_2 ` and `H_2SO_5` are GIVEN below :
Discussion
915.

Volume occupied by single CsCl ion part in a crystal is 7.014xx10^(-23) cm^(3).The smallest Cs-Cs internucleardistance is equal to length of the side of the cube corresponding to volume of one CsCl ion pair. The smallest Cs to Cs intermuclear distance is nearly

Answer»

`4.4Å`
`4.3Å`
`4.0Å`
`4.5Å`

SOLUTION :Volume of `CsCl=a^(3)`
`7.014xx10^(-23)CM^(3)=a^(3)` (a=edge LENGTH)
`a=root(3)(7.014xx10^(-23))`
`a=4.12xx10^(-8)cm=4.01Å~~4Å`
Discussion
916.

Which of the following isinsolublein dil HNO_(3)

Answer»

`HgS`
`PBS`
`Bi_(2)S_(3)`
`CuS`

ANSWER :c
Discussion
917.

Which of the following is insoluble in dil. HNO_3 but dissolves in aqua regia?

Answer»

Hg S
Pb S
`Bi_2 S_3`
`CuS`.

SOLUTION :HgS dissolves in aqua regia but is insoluble in DIL . `HNO_3`
`3 Hg S + 2 HNO_(3) + 6 HCL to 3 Hg Cl_2 +2 NO + 4 H_2 O + 3 S `
Discussion
918.

Which of the following noble gas was reacted with PtF_(6) by Bartlett to prepare the first noble gas compound ?

Answer»

He
Xe
Ar
Kr

Answer :B
Discussion
919.

When 100 ml of M/10 NaOH solution and 50 ml of M/5 HCl solution are mixed, the pH of resulting solution would be

Answer»

0
7
Less than 7
More than 7

SOLUTION :100 ml of `(M)/(10) NaOH = 50 ml` of `(M)/(5)NaOH`. They exactly NEUTRALISE 50 ml `(N)/(5)HCl`. Hence pH of resulting solution = 7.
Discussion
920.

Two liquids A and B have vapour pressure of 500 mm Hg and 200 mm Hg respectively. Calculate the mole fraction of A at which two liquids have equal partial pressures.

Answer»


SOLUTION :`"For liquid A" , P_(A)=P_(A)^(@)orP_(A)=500 mm X_(A)`
`"For liquid B", P_(B)=P_(B)^(@)X_(B)or P_(B)=P_(B)^(@)(1-x_(A))=200MM(1-x_(A))`
SINCE the VAPOUR pressures of the two liquids are to be same, `P_(A)=P_(B)`
`Therefore 500x_(A)=200 (1-x_(A))or X_(A)=200/700=0.286`
Mole fraction of A at which the two liquids have equal partial pressures = 0.286.
Discussion
921.

What type of substances form lyophobic sols ?

Answer»

Solution :Substances such as metals, their SULPHIDES, etc. which do not MIX directly with the dispersion medium form LYOPHOBIC SOLS.
Discussion
922.

Which of the following combination of orbitals is correct ?

Answer»




ANSWER :C
Discussion
923.

What is benefaction?

Answer»

Solution :REMOVAL of unwanted METERIALS e.g., sand, clay, etc. from the ore is KNOWN as benefaction (or CONCENTRATION or dressing).
Discussion
924.

Which of the following is not a copolymer ?

Answer»

TERELYNE
POLYTHENE
Nylon-66
Nylon-2

Solution :Polythene
Discussion
925.

Which one of the following complexes will have four isomers ?

Answer»

`[CO(en)(NH_(3))_(2)Cl_(2)]Cl`<BR>`[Co(PPh_(3))_(2)(NH_(3))_(2)Cl_(2)]Cl`
`[Co(en)_(3)]Cl_(3)`
`[Co(en)_(2)Cl_(2)]Br`

Solution :The four isomers of `[Co(en)_(2)Cl_(2)]Br` are trans ISOMER, CIS`-` isomer `(d-` and `l-` isomers ) and ionization isomer `[Co(en)BrCl]Cl`.
Discussion
926.

When ether is exposed to air for sometime as explosive substance produced is ________.

Answer»

PEROXIDE
oxide
TNT
SUPEROXIDE

ANSWER :A
Discussion
927.

Which of the following reduction is not thermodynamically feasible ?

Answer»

`Cr_(2)O_(3) + 2Al rarr Al_(2)O_(3) + 2Cr`
`Al_(2)O_(3) + 2Cr rarr Cr_(2)O_(3) + 2Al`
`3TiO_(2) + 4Al rarr 2Al_(2) + 3Ti`
none of these

Answer :B
Discussion
928.

Which of the following interface cannot be obtained ?

Answer»

liquid-liquid
solid-liquid
liquid-gas
gas-gas

Solution :Gas-gas MICTURE FOES not have any interfce.
Discussion
929.

Which of the following statements about anhydrous aluminium chloride is correct ?

Answer»

It exists as `AlCl_3` molecule
It is a STRONG Lewis base
It is not EASILY hydrolysed
It SUBLIMES at `100^@C` under vacuum

Answer :D
Discussion
930.

What happens during the electrolysis of molten sodium chloride?

Answer»

`Cl_(2)` is released at the cathode
Liquid SODIUM is OBTAINED at the anode
The emf of the overall reaction is -4.07 V
Both (a) and (B)

ANSWER :C
Discussion
931.

What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements?

Answer»

Solution :The general characteristics of transition elements are:
(i) Electronic configuration: `(n-1) d^(1-10) ns^(1-2)`
(II) Metallic character, Except Zn, Cd and Hg they show typical metallic properties.
(III) Atomic size and ionic size: Ions of same charge in a given series show progressive decrease in radius with increasing atomic number
(iv) Oxidation states: Except scandium, all elements show variable oxidation STAE in first series ranging from (+2) to (+7).
(v) Paramagnetism: Ions with unpaired electrons are paramagnetic.
(vi) Ionization enthalpy: Increases with effective nuclear charge.
(vii) Formation of coloured ions: Presence of incompletely filled d-orbitals are responsible for the colour of ions.
(viii) Formation of complex compounds: Due to HIGH nuclear charge and small size, metal ions FORM a complex compound.
(ix) Catalytic properties: The ability to adopt multiple oxidation states make them good catalyst.
(x) Formation of interstitial compounds.
(xi) Alloy formation.
They are called transition elements because of incompletely filled d-orbitals in ground state and in oxidized state. Zn, Cd, Hg have completely filld d-orbitlas `(d^(10))` in ground state as well as in its oxidized state. Hence, they are not considered transition elements.
Discussion
932.

Which acid has lowest value of pK_a ?

Answer»

<P>p - Methoxybenzoic ACID
p - Chlorobenzoic acid
p- Aminobenzoic acid
p- TOLUIC acid

ANSWER :B
Discussion
933.

Write the IUPAC name ofthe following coordination compound: [Cr(NH_3)_6]^(3+)

Answer»

SOLUTION :Hexa-ammine CHROMIUM (III) ION
Discussion
934.

Which of the following complex ion has a magnetic moment same as [Cr(H_(2)O)_(6)]^(3+)

Answer»

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

ANSWER :A
Discussion
935.

Which is most reactive chemically ?

Answer»

Mg
Ca
Sr,
Ba

Answer :D
Discussion
936.

Upon passing 0.01 moles HCl gas through 100mL of 0.05M Formic acid solution (K_(a)=1.8xx10^(-4)) determine change in pH of solution and [HCOO^(-)] in resulting solution.

Answer»

Solution :INITIAL `pH:alpha=sqrt((K_(a))/(C))=0.06(lt0.1)`
So `[H^(+)]=Calpha=0.06xx0.05=0.003M`
`:.pH=2.52`
final `pH=-log(0.01)/(0.1)=1` :.CHANGE =`1-2.52=-1.52`.
Now `K_(a)=([H^(+)][HCOO^(-)])/([HCOOH])rArr 1.8xx10^(-4)=(0.1xx[HCOO^(-)])/(0.05)`
`rArr [HCOOH^(-)]=9xx10^(-5)M`
Discussion
937.

What is the difference between animal and plant hormones?

Answer»

Solution :The specific glands can SECRETE animal HORMONES in the body but there are no specific glands to secrete PLANT hormones.
Discussion
938.

Which element has pseudo inert gas electronic configuration?

Answer»

Solution :EIGHTEEN electrons in the valence shell is CALLED PSEUDO inert gas electronic configuration. Palladium `(Z = 46)` has pseudo inert gas configuration in elemental form. Electronic configuration of Pd `(Z = 46)` is `[Ar]3d^(10)4s^(2)4p^(6)4d^(10)`.
Discussion
939.

Which of the following represents the correct order of acidity in the given compounds?

Answer»

`FCH_2 COOH GT CH_3 COOH gt BrCH_2 COOH gt CL CH_2COOH`
`BrCH_2COOH gt Cl CH_2 COOH gt FCH_2COOH gt CH_3 COOH`
`FCH_2 COOH gt ClCH_2 COOH gt BrCH_2 COOH gt CH_3COOH`
`CH_3 COOHgt BrCH_2COOHgt ClCH_2 COOH gt FCH_2COOH`

ANSWER :C
Discussion
940.

Reversible adsorption is :

Answer»

Solution :In this type of adsorption, molecules of ADSORBATE are being held to the solid SURFACE by weak attractive FORCES called van DER Waals. forces.
Discussion
941.

Which one of the following will not show geometrical isomerism

Answer»




Solution :Structure have 3-different ATOMS and group so it is UNABLE to SHOW GEOMETRICAL isomerism.
Discussion
942.

Which of the following is addition polymer ?

Answer»

NYLON
PVC
Terylene
Bakelite

ANSWER :B
Discussion
943.

Which of the following has a pyramidal structure?

Answer»

`ClO_(2)`
`ClO_(2)^(-)`
`ClO_(3)^(-)`
`ClO_(4)^(-)`

ANSWER :A
Discussion
944.

Which among the following will boil at highest temperature?

Answer»

HCI
HF
HI
HBr

Answer :A
Discussion
945.

Which alkane will be formed as major product on electrolysis aqueous solution of sodium propanoate?

Answer»

`CH_4`
`CH_3CH_3`
`CH_3CH_2CH_2CH_3`
`CH_3CH_2CH_3`

ANSWER :C
Discussion
946.

To takes part in reaction minimum kinetic energy is required is called….

Answer»

INTERNAL energy
Kinetic energy
Activation energy
Critical energy

Answer :C
Discussion
947.

Which of the following on oxidation with hot alkaline KMnO_(4) gives benzoic acid?

Answer»

Toluene
Ethylbenzene
Zw-propylbenzene
All of these

Solution :All alkylbenzenes CONTAINING a benzylic HYDROGEN on oxidation give benzoic acid irrespective of the LENGTH of the alkyl group.
Discussion
948.

Which of the following does not give hydrogen peroxide on hydrolysis?

Answer»

`H_(2)S_(2)O_(3)`
`H_(2)SO_(5)`
`H_(2)S_(2)O_(7)`
`H_(2)S_(4)O_(6)`

SOLUTION :`UNDERSET((50%))(2H_(2)SO_(4))+2H^(o+)+2HSO_(4)^(-) , 2HSO_(4)^(-) to H_(2)S_(2)O_(8)+2e^(-)`
`H_(2)S_(2)O_(8)+H_(2)O overset(F.D.)to H_(2)SO_(5) +H_(2)SO_(4), H_(2)SO_(5)+H_(2)Ooverset(F.D.)to H_(2)O_(2)+H_(2)SO_(4)`
Discussion
949.

The true statements from the following is/are:- (a)PH_(5) and BlCl_5 donot exist (b) P_(pi)-d_(pi) bond is present in SO_2 (c) dilute HCl provide acidic medium to KMnO_4 (d) SeF_4 and CH_4 have same shape (e) I_3^(+) has bent geometry

Answer»

a,C
a,B,e
a,c,e
a,b,d

ANSWER :B
Discussion
950.

What volume of 75% alcohol by mass (d=0.8 g/cm^(3)) must be used to prepare 150cc. Of 30% alcohol by mass (d=0.9g//cm^(3))?

Answer»

44.44mL
56.25mL
67.5mL
33.56mL

Solution :Let v mL of ALCOHOL was USED.
`(75)/(100)xxVxx0.8=(30)/(100)xx150xx0.9`
V=67.5mL
Discussion