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351.

Whichof the followingis morebasic amine ?

Answer»

`(CH_(3))_(2)NH`
`(C_(2)H_(5))_(3)N`
`(CH_(3))_(3)N`
`C_(2)H_(5)NH_(2)`

Answer :B
Discussion
352.

Which electrolyte is used in Dennis method for the prepartion of fluorine ?

Answer»

`KHF_2` in ANHYDROUS HF
MOLTEN cryolite
pure DRY molten `KHF_2`
NONE of these

Answer :A
Discussion
353.

Which of the following polymers can have strog intermolecular forces.

Answer»

NYLON
POLYSTYRENE
RUBBER
Polyesters

Answer :A::D
Discussion
354.

The standard reduction potential for Zn^(2+)//Zn, Ni^(2+)//Ni and Fe^(2+)//Fe are -0.76,-0.23 and -0.44" V " respectively. The reaction X+Y^(2+) to X^(2)+Y will have more negative DeltaG value when X and Y are

Answer»

X=Ni, Y=Fe
X=Ni , Y=Zn
X=Fe , Y=Zn
X=Zn , Y=Ni

Solution :(d) `X+Y^(2+) to X^(2+)+Y`
`DELTAG=-nFE_(cell)`.
Greater the value of `E_(cell)`.more will be the value of `DeltaG`. For this, the difference between `E^(@)` values of `X^(2+)` and `Y^(2+)` must be maximum. This MEANS that X=Zn and Y=Ni.
Discussion
355.

The standard reduction potential for Zn^(2+)//Zn, Ni^(2+)//Ni and Fe^(2+)//Fe are -0.76,-0.23 and -0.44" V " respectively. The reaction X+Y^(2+) to X^(2)+Y will be spontaneous when :

Answer»

X=NI, Y=Fe
X=Ni , Y=Zn
X=Fe , Y=Zn
X=Zn , Y=Ni

Solution :(d) `X+Y^(2) to X^(2+)+Y`
For REACTION to be spontaneous,`E^(@)` must be positive `E_(Zn^(2+)//Zn)^(@)+E_(Ni^(2+)//Ni)^(@)=0.76+(-0.23)=0.53` (positive).
Discussion
356.

The structure of neopentane is :

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)CH_(3)`
`CH_(3)-UNDERSET(CH_(3)"")underset(|"")(CHCH_(2)CH_(3))`
`CH_(3)-underset(CH_(3))underset(|)OVERSET(CH_(3))overset(|)(C)-CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(2)CH_(3)`.

Answer :C
Discussion
357.

whathappenwhen : (a)Dry sodium propionate is heatedwithsodaaline ? ( b)Electroysis of anaqueoussolutionof potassiumacetateis done? ( C)Ethyl iodineis treatedwithphosphousand hydrogeniodine? ( d)Electrolysis of anaqueoussolutionofpotassiumacetaneis done ?,(e)Ethyl iodinedissolvedindry etheris treatedwithsodiummetal ? (f) Methaneis treatedwithiodinein presenceof anoxidisingagent ? (g)n- Hexaneis treatedwihCr_(2)O_(3)supportedoveraluminaat 873 K? (h) Ethaneis treated withconc , nitricacid at 723 K? (i) Lithiumdimethyl cuprateis treatedwith ethylbromide?

Answer»

Solution :`C_(2)H_(5)COONa+NaOHoverset(CaO)to C_(2)H_(6)+Na_(2)CO_(3)`
`(B) Al_(4)C_(3)+12H_(2)Oto 3CH_(4)+4Al(OH)_(3)`
`( C) (i) 3C_(3)H_(5)I+3HIoverset(423K)to 3C_(2)H_(6)+3I_(2)`
`(ii) 2P+3l_(2)to 2Pl_(3)`
`(d) 2CH_(3)COOK+2H_(2)O to C_(2)H_(6)+2CO_(2)+2KOH+H_(2)`
`( E) 2C_(2)H_(5)I+2Nato C_(4)H_(10)+2Nal`
`(f ) (i) CH_(4)+I_(2)hArrCH_(3)I+HI`
`(ii) 2HI+Oto H_(2)O+I_(2)`
(G)`C_(6) H_(14)underset(873K)overset(Cr_(2)O_(3)//Al_(2)O_(3))to C_(6)H_(6)+4H_(2)`
`(H) C_(2)H_(6)+HNO_(3)overset(723K)to C_(2)H_(5)NO_(2)+CH_(3)NO_(2)`
(i)` Li (CH_(3))_(2)CuH_(5)Brto C_(3)H_(8)+C_(3)H_(8)+CH_(3)CU+Li Br`
Discussion
358.

Vapour pressure of chloroform (CHCl_(3)) and dichloromeane (CH_(2)Cl_(2)) at 298 K are 200 mm Hg and 415 mm Hg respectively.(i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl_(3) and 40 g of CH_(2)Cl_(2) at 298 K and,(ii) Mole fractions of each component in vapour phase.

Answer»

Solution :(i) Molar mass of `CH_(2)Cl_(2)`
`=12xx1+1xx2+35.5xx2`
`= 85 G mol^(-1)`
(ii) Molar mass of `CHCl_(3)`
`=12xx1+1xx1+35.5xx3`
`=119.5 g mol^(-1)`
Moles of `CH_(2)Cl_(2) = (40G)/(85g mol^(-1))=0.47` mol
Moles of `CHCl_(3)=(25.5g)/(119.5 g mol^(-1))=0.213`mol
Total number of moles `= 0.47+0.213`
= 0.683 mol
`chi_(CH_(2)Cl_(2))=(0.47 mol)/(0.683 mol)=0.688`
`chi_(CHCl_(3))=1.00-0.688 = 0.312`
Using equation (2.16)
`p_("total")=p_(1)^(0)+(p_(2)^(0)-p_(1)^(0))chi_(2)`
`= 200+(415-200)xx0.688`
`=200+147.9=347.9` mm HG
(ii) Using the relation `p_(i)=y_(1)//p_("total")` we can calculate the MOLE :
`p_(CH_(2)Cl_(2)=0.688xx415` mm Hg = 285.5 mm Hg
`p_(CHCl_(3))=0.312xx200` mm Hg = 62.4 mm Hg
`y_(CH_(2)Cl_(2))=285.5` mm Hg/347.9 mm Hg = 0.82
`y_(CH_(2)Cl_(3)=62.4` mm Hg/347.9 mm Hg = 0.18
Note:since, `CH_(2)Cl_(2)`is a more volatile component than `CHCl_(3)`.
`[p_(CH_(2)Cl_(2))^(0)=415 " mm Hg and " p_(CHCl_(3))^(0)=200 " mm Hg"]`
andthe vapour phase is also richer in `CH_(2)Cl_(2)`.
`[y_(CH_(2)Cl_(2))=0.82 " and " y_(CHCl_(3))=0.18]`
It may thus be concluded that at equilibrium,vapour phase will be always rich in the component which is more volatile.
Discussion
359.

Write the formula of the noble gas species whicg is isostructural with IBr_(2)^(-).

Answer»

SOLUTION :`IBr_(2)^(-)` is isostructural with `XeF_(2)`.
Discussion
360.

Which of the following species is diamagnetic?

Answer»

`Ti^(2+)(Z=22)`
`ZN^(2+)(Z=30)`
`Ni^(2+)(Z=28)`
`CR^(3+)(Z=24)`

Answer :B
Discussion
361.

Theory of ionization was given by

Answer»

Rutherford
Graham
Faraday
ARRHENIUS

Solution :Arrhenius PROPOSED the THEORY of IONISATION.
Discussion
362.

What happens when metyl isocyanide reacts with the following reagents? (i) Mineral acid (ii) Na+C_(2)H_(5)OH

Answer»

Solution :(i) `underset("Methyl isocyanide")(CH_(3)-NC+2H_(2)O) underset("ACID")(to)underset("Methyl amine" (1^(@)))(CH_(3)NH_(2))+underset("Formic acid")(HCOOH)`
(ii) `underset("Methyl isocyanide")(CH_(3)-NC)+4[H] overset(Na//C_(2)H_(5)OH)(to) CH_(3)-underset("DIMETHYL amine"(2^(@)))underset(H)underset(|)(N)-CH_(3)`
Discussion
363.

Whichof the followingis responsiblefor herditycharacter ?

Answer»

DNA
RNA
PROTEINS
HORMONES

ANSWER :A
Discussion
364.

What are emulsions ? What are their different types ? Give example of each type.

Answer»

SOLUTION :COLLOIDAL dispersion of one liquid into other IMMISCIBLE liquid. In other words, both dispersed phase and the dispersion MEDIUM are immiscible liquids is known as emulsion.
Classification of emulsion. :
(i)OIL-in-water, water acts as dispersion medium. For example : Milk, vanishing cream.(ii) Water-in-oil, oil acts as dispersion medium. For example : Butter, cold cream.
Discussion
365.

The reducing agent used in wolf-kishner reduction is ................

Answer»

SOLUTION :`NH_2 - NH_2 + C_2H_5ONa`
Discussion
366.

Which product is formed , when acetonitrile is hydrolysed partially with dil . HCl ?

Answer»

Acetic acid
ACETAMIDE
METHYL cyanide
Acetic ANHYDRIDES

ANSWER :B
Discussion
367.

Which of the following produces a mixture of CO and CO_2 by reaction with H_2SO_4 ?

Answer»

SODIUM acetate
Sodium oxalate
Formic acid
Sucrose

Solution :
Discussion
368.

Which is the strongest base among the following?

Answer»

`LA(OH)_(3)`
`Lu (OH)_(3)`
`CE(OH)_(3)`
`YB(OH)_(3)`

Answer :a
Discussion
369.

Which plot is the adsorptoion isobar for chemisorption where m (at constant pressure ) at temperatureT ?

Answer»

` (##DPB_PHY_CHM_IX_C13_E01_018_O01.png" width="30%">.
` (##DPB_PHY_CHM_IX_C13_E01_018_O02.png" width="30%">.
` (##DPB_PHY_CHM_IX_C13_E01_018_O03.png" width="30%">.
` (##DPB_PHY_CHM_IX_C13_E01_018_O04.png" width="30%">

Solution :Chemical ADSORPTION first INCREASES , then decreases to ATTAIN constancy with rise in TEMPERATURE .
Discussion
370.

Which of the following polymer can be formed by using the following monomer unit?

Answer»

NYLON 6, 6
Nylon 2-nylon6
MELAMINE POLYMER
Nylon-6

Answer :D
Discussion
371.

Write the names and structures of the monomers of the following polymers: (i) Buna-S (ii) Buna-N (iii) Dacron (iv) Neoprene.

Answer»

Solution :(i) Buna - N : `CH_(2) = underset("1,3 -Butadiene")(CH) = CH_(2) = CH_(2) and C_(6)H_(5) - underset("Styrene")(CH) =CH_(2)`
(ii) Buna` - N : CH_(2) = underset("1,3- Butadiene")(CH) - CH = CH_(2) and CH_(2) = underset("Acrylonitrile")(CH) - CN`
DACRON: `HO - underset("Ethylene glycol")(CH_(2)-CH_(2)) - OH ` and
(iv)Neoperene : `underset("CHLOROPRENE or 2 - chloro - 1,3-butadiene")(CH_(2) = overset(Cl) overset(|)(C) - CH = CH_(2))`
Discussion
372.

Which of the following is the uppermost rexampleion of the atmosphere ?

Answer»

Stratosphere
Troposphere
Exosphere
Ionosphere

Answer :C
Discussion
373.

The temperature , at which the vapour pressure of a liquid becomes equal to the atmospheric pressure is known as

Answer»

Freezing POINT
Boiling point
Absolute temperature
NONE of these

Answer :B
Discussion
374.

Which of the following reaction can be used to define the heat of formation of CO_(2)(g)

Answer»

`C("graphite")+O_(2)(G)=CO_(2)(g)`
`CH_(4)(g)+2O_(2)(g)=CO_(2)(g)+2H_(2)O(L)`
`CO(g)+(1)/(2)O_(2)(g)=CO_(2)(g)`
`C_(6)H_(6)(l)+7(1)/(2)O_(2)(g)=6CO_(2)+3H_(2)O(l)`

Solution :By definition of HEAT of required result.
Discussion
375.

Which does not form amalgam

Answer»

Fe
Co
Ag
Zn

Answer :A
Discussion
376.

Which of the following is correct order for basic nature?

Answer»

`CH_(3)FgtCH_(3)OHgtCH_(3)NH_(2)`
`CH_(3)FgtCH_(3)NH_(2)gtCH_(3)OH`
`CH_(3)NH_(2)gtCH_(3)FgtCH_(3)OH`
`CH_(3)NH_(2)gtCH_(3)OHgtCH_(3)F`

Solution :`CH_(3)NH_(2)` is more basic due to pair on `N` and `+I.E` of `CH_(3)` GROUP `CH_(3)OH` is acidic due to `O-H` group `CH_(3) F`is neutral.
Discussion
377.

What is the major product obtained by mono-chlorination of 2-methylbutane

Answer»

SOLUTION :2-methylbutane give form mono chlorination PRODUCTS. Among the form 2-chloro 3-methyl is the MAJOR product following the REACTIVITY, SELECTIVITY
Discussion
378.

What is ''semi permeable membrane''?

Answer»

Solution :A semipermeable membrane is a continuous SHEET or film of suitable material (natural or synthetic) which has PORES such that solvent MOLECULES can PASS through but big molecules of the solute cannot.
Discussion
379.

Which ofthe followingsubstitutedbenzene derivativeswould furnish three isomer when onemore substituent is introduced ?

Answer»




Discussion
380.

triangleS is postive for the change:

Answer»

MIXING of TWO gases
Boiling of liquid
Melting of Solid
All

Answer :D
Discussion
381.

Which metals play an important role in the development of human civilization?

Answer»

AL and Mg
Na and K
FE and CU
Mn and Ni

Solution :Fe and Cu
Discussion
382.

When electricity is passed through aqueous solution of aluminium chloride. 13.5 g of Al are deposited. The number of Faradays of electricity passed must be

Answer»

2
1.5
1
0.5

Answer :B
Discussion
383.

What is the influence of added non-volatile solute on the boiling point of solvent ?

Answer»

Solution : The vapour pressure of solvent in a solution is less. Therefore temperature must be RAISED to make the vapour pressure of the solution equal to the ATMOSPHERIC pressure. Hence, BOILING point of solution will be greater than that of the solvent.
Discussion
384.

The sodium chloride is used in the manufacture of -

Answer»

`CI_(2)`
`NAOH`
`Na_(2)CO_(3)`
All of these

Answer :D
Discussion
385.

The strongest oxidant

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
`I_(2)`

SOLUTION :`F_(2)` is strong E.N. COMPOUND
Discussion
386.

What is the product formed in the following reaction C_(6)H_(5)OH+C Cl_(4)underset((2)" "H^(+))overset((1)" "NaOH)to

Answer»

p-hydroxybenzoic acid
o-hydroxybenzoic acid
Benzaldehyde
Salicylaldehyde

Answer :B
Discussion
387.

Ylide is the reagent used in

Answer»

Reformatsky REACTION
Fittig reaction
Wittig reaction
Perkin reaction.

Solution :YLIDE is the REAGENT USED in Wittig reaction.
Discussion
388.

Which of the following sets contain only additionhomopolymers ?

Answer»

Polythene , NATURAL rubber , CELLULOSE
NYLON , polyester , MELAMINE resin
Neoprene , PVC , polythene

Solution :Neoprene is MADE from chloroprne , PVC is from vinyll chloride and polythene is from ethanemonomer .
Discussion
389.

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic ? Justify your answer.

Answer»

Solution :FERROMAGNETIC SUBSTANCES MAKE better permanent magnets. Metal ions in ferromagnetic substance are grouped into small regions called domains. Each domain acts as a tiny magnet. These domains are oriented in a random manner. When placed in a magnetic field, these domains or tiny magnets get oriented in the direction of the magnetic field and a strong magnetic effect is produced. The effect persists even after removal of magnetic field. This BEHAVIOUR is not EXPECTED from ferrimagnetic substances.
Discussion
390.

Which of the following hydroxide has more covalent character ?

Answer»

`GD (OH)_(3)`
`PM (OH)_(3)`
`Dy (OH)_(3)`
`Nd(OH)_(3)`

Answer :C
Discussion
391.

Which of the following will have highest pH value in water solution ?

Answer»

NACL
`Na_(2)CO_(3)`
`NH_(4)Cl`
`NaHCO_(3)`

Answer :B
Discussion
392.

There are three isomeric compounds P,Q,R with molecular formula C_(4)H_(6)O_(3).Compound P is a saturated hydroxy carboxylic acid.Compound Q is a symmetrical anhydride while R is an aldehydic ester. Which of the following is P?

Answer»




SOLUTION :N//A
Discussion
393.

The transition elements are more metallic then p - block elements because they have

Answer»

ELECTRON PAIRS in d- orbitals
Availability of d - orbitals for BOUNDING
The electron in p - orbitals
Unpaired electronin metallic orbitals

Answer :B
Discussion
394.

Volume of a mixture of 6.02xx10^(23) oxygen atoms and 3.01xx10^(23) hydrogen molecules at NTP is:

Answer»

28.0litre
33.6litre
11.2 litre
22.4 litre

Answer :D
Discussion
395.

Two radio isotopes A and B of atomic mass X and Y are mixed in equal amount by mass. After 20 days , their mass ratio is found to be 1:4. Isotope A has a half-life of 1 day. The half-life of isotope B is :

Answer»

`1.11 (Y)/(X)` DAYS
`0.11 (X)/(Y)` day
0.6237 day
1.10 day

Answer :D
Discussion
396.

Which represents nucleophilic aromatic substitution reaction ?

Answer»

Reasction of BENZENE with `Cl_(2)` in sunlight
Benzyl bromide HYDROLYSIS
REACTION of NaOH with dinitro fluoro benzene
Sulphonstion of benzene

Solution :
Discussion
397.

Which of the following has lowest first ionisation enthalpy?

Answer»

1. Mg
2. Rb
3. Li
4. Ca

Answer :B
Discussion
398.

Which of the following statement are true regarding the log K vs 1//T. Plot shown in the given diagram?

Answer»

<P>Plot P shows that the energy of ACTIVATION is independent of temperature
Plot Q describes the BEHAVIOUR of temperature dependence of energy of activation
Arrhenius behaviour is described by P
The slope of curve P gives the value `-(E_(a))/(R)`

Answer :A::B::C::D
Discussion
399.

Write the reactions of the final alkylation product of aniline with excess of methyl iodide in presece of sodium carbonate solution.

Answer»

SOLUTION :`C_6 H_5+CH_3 I to[C_6 H_5overset(+ )(NH_2) CH_3 ]I^(-)`
` 2[C_6 H_5overset(+ )NH_2CH_3 ]I^(-) +Na_2 CO_3to 2C_6NHCH_3CH_3 +2NAL +CO_2+H_2 O`
`C_6H_5 NHCH_3underset( Na_2 CO_3) OVERSET(CH_3 I)to C_6 H_5N (CH_3)_2`
` C_6 H_5 N (CH_3)_2 +CH_3 I to underset("N,N,N-Trimethylaniliniumiodide")([C_6 H_5 overset(+)N (CH_3)_3 ]I^(-) underset(Na_2CO_3) overset(-2Nal)to+ underset("N.N.N-Trimethylanilinium carbonate ")( [C_6 H_5overset(+) N (CH_3)_3 ]_2CO_(3)^(2-))`
Discussion
400.

What are the hydrolysis products of . (i)sucrose and (ii) lactose ?

Answer»

SOLUTION :Sucrose on hydrolysis gives one molecule each of glucose and fructose while LACTOSE on hydrolysis gives one molecule each of glucose and galactose, as SHOWN by the following reactions :
Discussion