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18601.

XeO_(2)F_(2) is obtained by partial hydrolysis of

Answer»

`XeOF_(4)`
`XeF_(6)`
both (a) and (b)
NONE of these

Answer :C
Discussion
18602.

What is meant by linear arrangement of spheres in one direction ?

Answer»

Solution :(i) In a specific direction, there is only ONE possibility to ARRANGE the spheres in one direction.

(ii) In this arrangement, each sphere is in contact with TWO neighbouring spheres on eitherside.
Discussion
18603.

When 0.01 mol sodium sulphate is dissolve in 1 kg of water then complete ionization of solution is observed. Find decrease in freezing point of such solution. (K_(f)=1.86" K kg mol"^(-1))

Answer»


ANSWER :0.0186 K
Discussion
18604.

Whichof the followingis more baic in aqueousmedium ?

Answer»




SOLUTION :Aralkyl amineare more basicthananyaromaticamines . Benzyle AMINEIS aralkylamine.
Discussion
18605.

Which of the following yields propyl amine?

Answer»

`CH_(3)CH_(2)Broverset(1.NaCN)underset(2.LiAIH_(4))(rarr)`
`CH_(3)CH_(2)CHO overset(NH_(3))underset(H_(2)//Ni)(rarr)`
`CH_(3)CH_(2)CH_(2)overset(O)overset(||)(C)NH_(2)underset(OH)overset(Br_(2))(rarr)`
`CH_(3)COOH+N_(3)Hoverset(H^(+))(rarr)`

Solution :(a)`CH_(3)CH_(2)Broverset(CN^(-))(rarr)CH_(3)CH_(2)CNoverset("LiAIH"_(4))(rarr)CH_(3)CH_(2)CH_(2)NH_(2)`
(b)`CH_(3)CH_(2)CHOoverset(NH_(3))(rarr)CH_(3)CH_(2)overset(O)overset(||)(CH)-NH_(2)overset(H_(2))underset(Ni)(rarr)CH_(3)CH_(2)CH_(2)NH_(2)`
( c) `CH_(3)CH_(2)CH_(2)CONH_(2)overset(Br_(2))underset(OH^(-))(rarr)CH_(3)CH_(2)CH_(2)NH_(2)`
Discussion
18606.

Write the structure of monomers used for getting the following polymers: Buna-S

Answer»

SOLUTION :
Discussion
18607.

When calomel react with NH_(4)OH solution the compound formed is

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`NH_(2)-Hg-Cl`
`Hg_(2)Cl_(2)NH_(3)`
`Hg(CH_(3))_(2)Cl_(2)`
`HgCl_(2)NH_(3)`

ANSWER :A
Discussion
18608.

Xenon reacts with PtF_(6) and gave an …………………… .

Answer»

SOLUTION :ORANGE YELLOW SOLID `[XePtF_(6)]`
Discussion
18609.

Voltage of the cell Pt,H_2(1 atm)|HOCN(1.3xx10^(-3)M)||Ag^(+)(0.8M)|Ag(s) is 0.982 V. Calculate the K_a for HOCN. Neglect [H^+] because of oxidation of H_2(g).Ag^+etoAg(s)=0.8V

Answer»


ANSWER :A::D
Discussion
18610.

When is ferrimagnetism observed in a substance?

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SOLUTION :When MAGNETIC moments of the domains are aligned PARALLEL and in ANTIPARALLEL DIRECTIONS in unequal numbers.
Discussion
18611.

Which of the following plot is correct about the kinetic energy of photoelectrons ?

Answer»




ANSWER :A
Discussion
18612.

What is the solubility of CaF_2in a buffer solution containing 0.45 M HCOOH and 0.20 M HCOONa? K_(sp)(CaF_2) = 3.4 xx 10^(-11), K (HF) = 6.8 xx 10^(-4), K (HCOOH) = 1.7 xx 10^(-4)

Answer»

Solution :`2[CA^(2+)] =[F^(-)] + [HF] `
`2.75 XX 10^(-4) M`
Discussion
18613.

When the temperature is increased, heat is supplied which increases the kinetic energy of the reacting molecules. This shall increase the number of collisions and ultimately the rate of reaction shall be enhanced. Arrhenius suggested a equation which describes K as a function of temperature, i.e. k=Ae^(-E_(a)//RT) where k= rate constant A= a constant (frequency factor) E_(a)= energy of activation log_(10)k=log_(10)A-(E_(a))/(2.303R)[(1)/(R )] Y=C+MX It is the equation of straight line with negative slope. On plotting log_(10)k against [(1)/(T)] we get a straight line as shown below : The slope gives activation energy and intercept gives frequency factor. Also log.(k_(2))/(k_(1))=(E_(a))/(2.303)[(T_(2)-T_(1))/(T_(1)T_(2))] A first order reaction is 50% complete in 30 minutes at 27^(@)C and 10 minutes at 47^(@)C . The energy of activation of the reaction is

Answer»

`43.84 kJ//mol`
`34.84kJ//mol`
`84.00kJ//mol`
`30.00kJ//mol`

ANSWER :A
Discussion
18614.

The reagent/reagents required for the conversion of

Answer»

BAEYER's reagent
`O_(3` followed by `Zn//H_(2)O`
`KMnO_(4)//H^(+)`
Lemieux reagent.

SOLUTION :`(B) RCH=CHR'+2[O] underset("Ozonolysis")(overset("REDUCTIVE")to RCHO+R'CHO`
`RCH=CHR'+2[O] overset(NalO_(4))to RCHO+R'CHO`
An aqueous solution of `NaIO_(4)` (sodium per iodate) is called Lemieux reagent.
Discussion
18615.

Which substance is used as an initiator in free radical addition polymerization reaction ?

Answer»

BENZOYL peroxide
ACETYL peroxide
`3^(@)` BUTYL peroxide
All of these

Solution :All of these
Discussion
18616.

When the temperature is increased, heat is supplied which increases the kinetic energy of the reacting molecules. This shall increase the number of collisions and ultimately the rate of reaction shall be enhanced. Arrhenius suggested a equation which describes K as a function of temperature, i.e. k=Ae^(-E_(a)//RT) where k= rate constant A= a constant (frequency factor) E_(a)= energy of activation log_(10)k=log_(10)A-(E_(a))/(2.303R)[(1)/(R )] Y=C+MX It is the equation of straight line with negative slope. On plotting log_(10)k against [(1)/(T)] we get a straight line as shown below : The slope gives activation energy and intercept gives frequency factor. Also log.(k_(2))/(k_(1))=(E_(a))/(2.303)[(T_(2)-T_(1))/(T_(1)T_(2))] The rate constant of a reaction is increased by 5% when its temperature is raised from 27^(@)C to 28^(@)C . The activation energy of the reaction in kJ/mol is

Answer»

`36.6`
`16.6`
`46.6`
`26.6`

ANSWER :A
Discussion
18617.

When the temperature is increased, heat is supplied which increases the kinetic energy of the reacting molecules. This shall increase the number of collisions and ultimately the rate of reaction shall be enhanced. Arrhenius suggested a equation which describes K as a function of temperature, i.e. k=Ae^(-E_(a)//RT) where k= rate constant A= a constant (frequency factor) E_(a)= energy of activation log_(10)k=log_(10)A-(E_(a))/(2.303R)[(1)/(R )] Y=C+MX It is the equation of straight line with negative slope. On plotting log_(10)k against [(1)/(T)] we get a straight line as shown below : The slope gives activation energy and intercept gives frequency factor. Also log.(k_(2))/(k_(1))=(E_(a))/(2.303)[(T_(2)-T_(1))/(T_(1)T_(2))] The activation energy of a reaction is 9 kcal/mol. The increase in rate constant when its temperature is raised from 295 to 300K is approximately

Answer»

`10%`
`50%`
`100%`
`255%`

ANSWER :D
Discussion
18618.

Which of the following are soluble in water?

Answer»

`Na_(2)CO_(3)`
`BaC_(2)O_(4)`
`MgCO_(3)`
`Ca(NO_(3))_(2)`

Answer :A::D
Discussion
18619.

What happens when acetone reacts with: Phenyl hydrazine

Answer»

SOLUTION :
Discussion
18620.

Which one is disperse dye

Answer»

CONGO red
Alizarin
Celliton
None of these

Solution :Disperse dye are usually applied in the form of dispersion of finely divided dye in soap solution in the PRESENCE of Phenol, Cresol, Benzoic acid etc. They aremainly USED to dye decron, NYLON, synthetic fibre. EXAMPLE Celliton (blue).
Discussion
18621.

What is the geometrical shape of complex and hybridisation of central metal in [Fe(CO)_5] ?

Answer»

Tetrahedral, `sp^3`
SQUARE PLANAR, `dsp^2`
Trigonal bipyramidal, `dsp^3`
Trigonal bipyramidal, `sp^3d`

ANSWER :C
Discussion
18622.

When 2.0 gm of organic compound is burnt completely , 150 ml N_(2) gas at 27^(@)C and 0.821 atm is obtained. The mass percent of nitrogen in the compound is

Answer»


ANSWER :7
Discussion
18623.

To a 4 L of 0.2 M solution of NaOH, 2L of 0.5 M NaOH are added. The molarity of the resulting solution is :

Answer»

0.7 M
0.3 M
1.8 M
1.18 M

SOLUTION :Moles of NaOH in 4 L solution `=0.2xx4=0.8`
Moles of NaOH in 2 L solution `=0.5xx2=1.0`
Total moles `=1.0+0.8=1.8`
Total volume of solution `=4+2=6L`
MOLARITY `=(1.8)/(6)=0.3` M
Discussion
18624.

Which order is correct ?

Answer»

`N gt O(IP_(2))`
`O gt N(IP_(1))`
`Zn gt Mn (IP_(1))`
`Al gt B(IP_(1))`

Answer :A
Discussion
18625.

Which of the following amines gives carbylamine reaction ?

Answer»

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

Answer :A
Discussion
18626.

Which of the following statements are correct about HCOOH?

Answer»

It is a stronger acid than `CH_(3)COOH`
It forms formyl chloride with `PCl_(5)`
It gives CO and `H_(2)O` on HEATING with conc. `H_(2)SO_(4)`
It reduces TOLLENS' reagent.

Solution :Formyl chloride being unstable DECOMPOSES to form CO+HCl.
Discussion
18627.

Which of the following has lowest pK_(b) value ?

Answer»

`NH_(3)`
`(CH_(3))_(2)NH`
`C_(6)H_(5)NH(CH_(3))_(2)`
`CH_(3)NH_(2).`

ANSWER :B
Discussion
18628.

Which of the following fibre is used for stitching during surgical operation?

Answer»

Terylene
Cotton
Nylon-2-nylon-6
ACETATE rayon

Answer :C
Discussion
18629.

What are artificial sweetening agents? Give example.

Answer»

SOLUTION :SYNTHETIC COMPOUNDS which IMPRINT a SWEET sensation and which imprint a sweet sensation and possess no or negligible nutritional value are called artificial sweeteners.
e.g., saccharin, aspartame, sucralose, alitame.
Discussion
18630.

When the temperature is increased, heat is supplied which increases the kinetic energy of the reacting molecules. This shall increase the number of collisions and ultimately the rate of reaction shall be enhanced. Arrhenius suggested a equation which describes K as a function of temperature, i.e. k=Ae^(-E_(a)//RT) where k= rate constant A= a constant (frequency factor) E_(a)= energy of activation log_(10)k=log_(10)A-(E_(a))/(2.303R)[(1)/(R )] Y=C+MX It is the equation of straight line with negative slope. On plotting log_(10)k against [(1)/(T)] we get a straight line as shown below : The slope gives activation energy and intercept gives frequency factor. Also log.(k_(2))/(k_(1))=(E_(a))/(2.303)[(T_(2)-T_(1))/(T_(1)T_(2))] The rate of certain reaction increases by 2.5 times when the temperature is raised from 300K to 310K. If k is the rate constant at 300K then rate constant at 310K will be equal to

Answer»

`K`
`2K`
`2.5k`
`13K`

ANSWER :C
Discussion
18631.

When the temperature is increased, heat is supplied which increases the kinetic energy of the reacting molecules. This shall increase the number of collisions and ultimately the rate of reaction shall be enhanced. Arrhenius suggested a equation which describes K as a function of temperature, i.e. k=Ae^(-E_(a)//RT) where k= rate constant A= a constant (frequency factor) E_(a)= energy of activation log_(10)k=log_(10)A-(E_(a))/(2.303R)[(1)/(R )] Y=C+MX It is the equation of straight line with negative slope. On plotting log_(10)k against [(1)/(T)] we get a straight line as shown below : The slope gives activation energy and intercept gives frequency factor. Also log.(k_(2))/(k_(1))=(E_(a))/(2.303)[(T_(2)-T_(1))/(T_(1)T_(2))] The rate of chemical reaction doubles for every 10^(@)C rise in temperature . If the temperature is increasedby 60^(@)C, the rate of reaction increases by about

Answer»

`20` TIMES
`32` times
`164` times
`128` times

Answer :C
Discussion
18632.

Which of the following optian is incorrect regarding N_(3)^(-)?

Answer»

AVERAGE oxidation state of N is `-(1)/(3)`
It has linear structure
Its having `p pi-p pi` as well as `p pi-d pi` linkage
Hybridisation of CENTRAL atom is sp

Solution :`overset(THETA)N=overset(o+)N=overset(Theta)N` No `ppi-dpi` linkage
Discussion
18633.

Which ofthefollowingoresareconcentratedbyfrothfloatation?

Answer»

HAEMETITE
GALENA
Copperpyrites
MAGNETITE

SOLUTION :Galenaandcopperpyritesare sulphideores.
Discussion
18634.

underset((A))(3CH_(3)COCH_(3))underset(-H_(2)O)overset(HCl)to(CH_(3))_(2)C=CH-underset((B))(CO)-CH=C(CH_(3))_(2). This polymer (B) is obtained when acetone is saturated with HCl gas, B can be

Answer»

Phorone
Formose
Diacetone alcohol
Mesityl oxide

Solution :
Phorone is self condensation product of ACETONE. It can ALSO be obtained from certain camphor COMPOUND. Phorone is combustible when exposed to heat or flame.
Discussion
18635.

Write two differences between multimolecular colloids and macromolecular colloids.

Answer»

Solution :(i) Multimolecular COLLOIDS are formed by AGGREGATION of small molecules (diameter `lt` lnm) while macromolecular colloids are formed from MACROMOLECULES and CONSIST of single molecules of colloidal size. (ii) Multimolecular colloids are generally lyophobic while macromolecular colloids are generally LYOPHILIC.
Discussion
18636.

Which one of the following is used as a substitute of wool for making blankets, sweaters?

Answer»

ORLON
terylene
POLYESTER
nylon

Solution :orlon
Discussion
18637.

The structure of diborane (B_(2)H_(6)) contains

Answer»

FOUR 2c-2e BONDS and TWO 3C-2e bonds
two 2c-2e bonds and four 3c -2e bonds
Two 2c-2e bonds and two 3c-3e bonds
Four 2c-3e bonds and four 3c-2e bonds

Solution :`{:("HHH "),("\/\/"),("BB"),("/\/\"),("HHH "):}`
3c-2e: B-H-B2c-2e: H-B-H
Discussion
18638.

What is the solution in which photographic film is washed? What reaction takes place?

Answer»

Solution :HYPO solution
`AgBr + 2 Na_(2)S_(2)O_(3) RIGHTARROW Na_(3)[AG(S_(2)O_(3))_(2)+ NaBr]`
Discussion
18639.

Which of the elements listed below shows allotropic forms?

Answer»

Iodine
Copper
Sulphur
Silver

Answer :C
Discussion
18640.

Which derivative of benzen among the following would undergo hydrolysis most readily with aqueous NaOH to give corresponding hydroxy derivative ?

Answer»




All equally.

Answer :C
Discussion
18641.

Which of the three, BF_(3), BCl_(3) and BBr_(3) is a weakest Lewis acid ?

Answer»

`BF_(3)`
`BCl_(3)`
`BBr_(3)`
All are of the same strength.

Solution :Lewis acid character DECREASES as :
`BBr_(3)gt BCl_(3) gt BF_(3)`
Discussion
18642.

Which of the following is not a correct order of solubility in water :-

Answer»

`LiOH lt NaOH lt KOH lt RbOH `
`AgF GT AgCl gt AgBr gt AgI`
`BeF_(2) lt BeCl_(2) lt BeBr_(2) lt BeI_(2)`
`BeSO_(4) gt MgSO_(4) gt CaSO_(4) gt BaSO_(4)`

Solution :ORDER of solubility `BeCl_(2) lt BeBr_(2) lt BeI_(2) lt BeF_(2)`
Discussion
18643.

Which of the following compounds form a stable Grignard reagent ?

Answer»

`CH_(3)-CH_(2)-O-CH_(2)-BR underset(Et_(2)O) overset(Mg)rarr`


Solution :The PRESENCE of acidic hydrogen in `-COOH` group destabilises GRIGNARD reagent.
Discussion
18644.

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

Answer»

is tripled
is doubled
is halved
remains unchanged

Answer :B
Discussion
18645.

Write the name, the structure and the magnetic behaviour of each one of the following complexes : (i) [Pt(NH_(3))_(2)Cl(NO_(2))] (ii) [Co(NH_(3))_(4)Cl_(2)]Cl (iii) Ni(CO)_(4)""(Al nos, Co = 27 , Ni = 28, Pt = 78)

Answer»

SOLUTION :(i) `[Pt(NH_(3))Cl(NO_(2))]`
IUPACname : Diammine chloridenitrito - N- platinum (ii)
Structure : Square planar `(dsp)^(2)`
MAGNETICBEHAVIOUR : Diamagnetic
(ii) `[Co(NH_(3))_(4)Cl_(2)]Cl` Tetraamine dichlorido cobalt (III) Chloride
Hybriisation : `d^(2) sp^(3)`
Shape : octahedral
Magnetic property : diamagnetic .

(iii) `[Ni(CO_(4))]`
Tetracarbonylnickel `(O)`
Behaviour: diamagnetic .
Structure = Tetrahedral
The complexes in which formed by hybridisation of one S and three p-orbita to obtain FOUR equivalent orbital ORIENTED tetrahedrally.
Discussion
18646.

Which of the following is not an antibiotic ?

Answer»

CHLORAMPHENICOL
SULPHADIAZINE
PENICILLIN
BITHIONAL.

ANSWER :D
Discussion
18647.

Which one of the following configuration represents a noble gas ?

Answer»

`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4S^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)`
`1s^(2)2s^(2)2p^(6)3p^(6)`
`1s^(2)2s^(2)2p^(6)3s^(2)`

Answer :B
Discussion
18648.

Which of the following pairs represents only electrophiles ?

Answer»

`H_(3)O^(+),SO_(3)`
`H_(2)O,H^(+)`
`NO_(3)^(+),NH_(2)`
`OH^(-),R-O-H`.

ANSWER :A
Discussion
18649.

Which involves osmosis ?

Answer»

Crenation
Plasmolysis
Haemolysis
All

Answer :D
Discussion
18650.

The structure of product (E) is :

Answer»




SOLUTION :(a)
HENCE. The ANSWER is `(a)`.
Discussion