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11901.

Unertainty in the position of an electron (mass=9.1xx10^(-31)kg) moving with a velocity 300ms^(-1) accurate upto 0.001% will be h=6.63xx10^(-34)Js

Answer»

`5.76xx10^(-2)m`
`1.92x10^(-2)m`
`3.84xx10^(-2)m`
`19.2xx10^(-2)m`

SOLUTION :`Deltax=h/(4pimDeltav)`
`Deltav=300xx0.001/100=3xx10^(-3)MS^(-1)`
`:.Deltax=(6.63xx10^(-34))/(4xx3.14xx9.1xx10^(-31)xx3xx10^(-3))`
`=1.93xx10^(-2)m`
Discussion
11902.

Which metal shows variable valency?

Answer»

Na
Cd
Zn
Cu

Answer :D
Discussion
11903.

The temperature, at which the volume of a given gas at 25°C becomes thrice when pressure of the system is kept constant

Answer»

75°C
894 K
440°C
350 K

Answer :B
Discussion
11904.

Which of the following complexes have doubtful existence ?

Answer»

`[FE (CO_(5))]`
`[SC (CO)_(6)]^(3+)`
`[Co (CO)_(6)]`
`[Ti (CO)_(6)]^(4+)`

Answer :B::D
Discussion
11905.

What volume of aqueous solution of NaOH that is 80% by mass NaOH, contanis 0.4 mol of NaOH. Density of solution is 0.8 gm//ml.

Answer»

`8 ml`
25 ml
16 ml
250 ml

SOLUTION :`0.4 " mole " NaOH = 0.4 xx 40 = 16 GM`
`80%` by MASS NaOH
`80 gm NaOH` in 100 gm solution
16 gm NaOH in 20 gm solution
Volume of solution `(V) = (m)/(d) = (20)/(0.8) = 25 ml`
Discussion
11906.

Which of the following statements is incorrect for Arrhenius rate constant equation.

Answer»

It give quantative IDEA about K and T.
As T INCREASE K is increasing and A is decreasing
As `E_(a)` INCREASES K is increasing
If `E_(a)`=0 then K=A

Answer :C
Discussion
11907.

When 2.0 g of a gas A is introduced into an evacuated flask kept at 25^(@)C, the pressure is found to be 1 atm. If 3 g of another gas B is them added to the same flask, the total pressure becomes 1.5 atm. Assuming ideal gas behaviour, calculate the ratio of molecular weights M_(A) : M_(B).

Answer»

Solution :Total pressure = 1.5 ATM.
Moles of A `= (2)/(M_(A))`
Moles of B `= (3)/(M_(B))`
Total moles `= (2)/(M_(A)) + (3)/(M_(B))`
Partial pressure of A `= (2//M_(A))/(2//M_(A) + 3//M_(B)) XX 1.5`
and partial pressure of B `= (3//M_(B))/(2//M_(A) + 3//M_(B)) xx 1.5`
As GIVEN, partial pressure of A = 1 atm.
Partial pressure of B = 1.5 - 1 = 0.5 atm.
THUS, `((2//M_(A))/(2//M_(A)+3//M_(B)) xx 1.5)/((3//M_(B))/(2//M_(A) + 3//M_(B)) xx 1.5) = (1)/(0.5) = 2`
or `(2)/(3) xx (M_(B))/(M_(A)) = 2` or `(M_(A))/(M_(B)) = (1)/(3)`
Discussion
11908.

Which has maximum pK_a value ?

Answer»




ANSWER :D
Discussion
11909.

Which gives black precipitate on reaction with CS_(2) followed by addition of HgCl_(2)?

Answer»

`(CH_(3))_(2)CNH_(2)`
`(C_(2)H_(5))_(2)NH`
`(CH_(3))_(3)N`
all the three

Solution :Only `1^(@)` AMIENS undergo Hofmann mustard oil reaction and thus give a black pot. Of HgS.
Discussion
11910.

The wavelength of a moving body of mass 0.1 mg is 3.31xx10^(-29) m. The kinetic energy of the body in J would be :

Answer»


ANSWER :A
Discussion
11911.

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct ? Assume that the temperatureis constant at 25^(@)C. (Given, Vapour' Pressure Data at 25^(@)C, benzene = 12.8 kPa toluene = 3.85 kPa)

Answer»

The vapour will CONTAIN a higher percentage of TOLUENE.
The vapour will contain EQUAL amounts of benzene and toluene.
Not enough information is given to make a prediction.
The vapour will contain a higher percentage of benzene.

SOLUTION :In composition of Benzene of vapour pressure is more hence its PROPORTION of percerntage is more in mixture.
Discussion
11912.

What is asymmetric carbon atom.

Answer»

Solution :If FOUR group around the CENTRAL CARBON atom are different, than that carbon is CALLED asymmetric carbon or chiral carbon. The resulting molecule WOULD lack symmetry and is called asymmetric molecule.
Discussion
11913.

Which is non poisonous hydride ?

Answer»

`H_(2)O`
`H_(2)S`
`H_(2)SE`
`H_(2)TE`

ANSWER :A
Discussion
11914.

When intial concentration of a reactant is doubled in a reaction ,its half -life periof is not affected.The order of the reaction is:

Answer»

ZERO
FIRST
second
More than zero but less than first.

Solution :First
`t_((1)/(2))=(0.693)/(K)` for first ORDER `t_((1)/(2))` is independent of CONCENTRATION .
Discussion
11915.

Which one of the following compounds is an anti-fertility drug?

Answer»

Aspirin
Chloromycetin
Saheli
Penicillin

Solution :The antifertility drugs are those CHEMICAL COMPOUNDS which prevent pregnancy in WOMAN. These, drugs CONTROLS the menstrual cycle and ovulation and so used as birth CONTROL drug or contraceptives
Discussion
11916.

Write the structures of A and B in the following reactions : (i) CH_(3) OCl overset( H_(2) , Pd-BaSO_(4))(rarr) A overset( H_(2) N - OH ) ( rarr) B (ii) CH_(3) Mg Br underset(2. H_(2) O^(+))overset( 1. CO_(2))(rarr) A overset( PCl_(3))(rarr) B

Answer»

Solution :(a) (i) `A=underset("Ethanal")(CH_(3) CHO),B= underset("Acetaldoxime")(CH_(3)-OH = NOH )`
(ii) `A = underset("Acetic ACID")(CH_(3)COOH),B=underset("Acetyl chloride")(CH_(3)COCl)`
Discussion
11917.

Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide ?

Answer»

Tertiary butyl chloride 
NEOPENTANE 
Isohexane 
Neohexane

Answer :B
Discussion
11918.

Which of the following is a hypovalent compound?

Answer»

`NF_3`
`NH_3`
`BF_3`
`IF_7`

ANSWER :C
Discussion
11919.

The suffix used in carboxylic acid is

Answer»

`-OIC`
`-ANE`
ENE
`-AL`

ANSWER :A
Discussion
11920.

Which of the following eract with phenyl hydrazine to give same osazone

Answer»

Glucose
FRUCTOSE
MANNOSE
Galactose

SOLUTION :Glucose and fructose give same OSAZONE reaction with phenylhydrazine as explained.
Discussion
11921.

When treated with bromine water, aniline forms a white precipitate of :

Answer»

ANILINE BROMIDE
p-bromoaniline
o-bromoaniline
2,4,6-tribromoaniline

Answer :C
Discussion
11922.

Which one of the following substances is most likely to be used as soap ?

Answer»

`CH_(3)(CH_(2))_(12)COOCH_(3)`
`CH_(3)(CH_(2))_(5)O(CH_(2))_(5)CH_(3)`
`CH_(3)(CH_2)_(12)COONa`
`CH_(3)(CH_(2))_(12)CHCl_(2)`

Solution :`CH_(3)(CH_(2))_(12) COONa` is most likely to be used as SOAP . A soap is the SODIUM salt (or potassium salt ) of a long chain carboxylic acid (or fatty acid).
Discussion
11923.

Which of the following cations form an amine complex with excess of ammonia:

Answer»

`AG^(+)`
`Cu^(2+)`
`CD^(2+)`
`Na^(+)`

SOLUTION :Na does not FORM complex.
Discussion
11924.

What is an ozoniser ?

Answer»

Solution :The APPARATUS used to CONVERT `O_2` into `O_3` by passing a SILENT ELECTRIC discharge (sparkless discharge) through `O_2` is called an ozoniser.
Discussion
11925.

When CuSO_4 is mixed with excess of NH_3, a deep blue coloured solution is obtained.What do you understand by the term coordination number

Answer»

SOLUTION :UMBER and LIGAND in a COORDINATION COMPOUND?
Discussion
11926.

Which is the correct method of synthesising acetamide from acetone?

Answer»

`CH_(3)COCH_(3) overset(Pd//BaSO_(4)) to CH_(3)CHO overset(NH_(3)) to CH_(3)CH_(2)NH_(2) overset(H_(2)O) to CH_(3)CONH_(2)`
`CH_(3)COCH_(3) overset(I_(2))underset(NAOH) to CH_(3)COONaoverset(H^(+)) underset(NH_(3)) to CH_(3)COONH_(4) overset(Delta) to CH_(3)CONH_(2)`
`CH_(3)COCH_(3) overset(CrO_(3)) to CH_(3)COOH overset(NH_(3)) to CH_(3)CONH_(2)`
`CH_(3)CONH_(3) overset(I_(2)) underset(NaOH) to CH_(3)COOH overset(HCl) to CH_(3)COCl overset(NH_(3)) to CH_(3)CONH_(2)`

Answer :B
Discussion
11927.

Vapour density of an organic compound is 23.0. it contains 52.17% of carbon and 13% of hydrogen. The compound gives idoform test the compound is :

Answer»

Ethanol
dimethyl ether
acetone
Methanel

Answer :C
Discussion
11928.

Two moles of organic compound 'A' on treatment with a strong base gives two compounds B and C. Compound 'B' on dehydrogenation with Cu gives 'A' while acidification of 'C yields carboxylic acid 'D' having molecular formula of CH_2O_2. Identify the compounds A, B, C and D.

Answer»

Solution :COMPOUNDS A to D are identified as follows :
`UNDERSET((A))(2HCHO overset("Conc.KOH")to underset( C)(HCOOK) + underset(B)(CH_(3)OH)`
`underset(B)(CH_(3)OH) overset(Cu)underset(573 K) to H - underset(A)overset(O)overset(||)C-H`
`underset ( C)(HCOOK) +HCl to underset(D)(HCOOH) + KCl`
Discussion
11929.

What is the gas liberated at anode during the manufacture of caustic soda using Nelson's cell?

Answer»

SOLUTION :CHLORINE of `Cl_(2)`.
Discussion
11930.

Two oxides of metals A and B are isomorphous . The metal A whose atomic mass is 52, forms a chloride whose vapour density is 79. the oxide of the metal B contains 47.1% oxygen. Calculate the atomic mass of B.

Answer»

SOLUTION :Let the VALENCY of A be X. the FORMULA of chloride`=Acl_(x)`
2 V.D.`=A+x xx35.5` or x=3
As the two oxides are isomorphous, the valency of B is also 3.
Equivalent mass of `B=(52.9)/(47.1)xx8=8.99`. Atomic mass of `B=8.99xx3=26.97`.
Discussion
11931.

Which of the following statement is / are correct :

Answer»

Magnesium CITRATE is USED as antacid
TARTAREMETIC is used to produce nausea
and vomiting in the treatment of POISONING
Cream of tartar (pot hydrogen TARTRATE )
is used in baking powder.
All

Answer :D
Discussion
11932.

Which one of the following is the correct increasing order of the magnitude of ionic radii of Ce^(3+), La^(3+) , Pm^(3+) and Yb^(3+) ?

Answer»

`Yb^(3+)lt PM^(3+) lt La^(3+) lt CE^(3+)`
`Yb^(3+) ltPm^(3+) lt Ce^(3+) lt La^(3+)`
`Pm^(3+) ltLa^(3+) ltCe^(3+) lt Yb^(3+)`
`Ce^(3+) lt Yb^(3+) lt Pm^(3+) lt La^(3+)`

SOLUTION :`{:(La^(3+),gt,Ce^(3+),gt,Pm^(3+),gt,Yb^(3+)),(106p m,,103p m,,98pm,,87 p m):}`
Ionic size DECREASE form`La^(3+)` to `Lu^(3+)` due to lanthanide contraction . Thus,
`Yb^(3+) lt Pm^(3+) lt Ce^(3+) lt La^(3+)`
Discussion
11933.

What is the function of sulphur in the vulcanization of rubber?

Answer»

Solution :Sulphur MAKES the rubber more elastic, more DUCTILE, LESS plastic and non - sticky.
Discussion
11934.

Which one of the following reagents will form diethyl ether from ethanol ?

Answer»

`H_2SO_4` at 413K
Cold HI SOLUTION
`H_2SO_4` at 443K
`DIL . H_2SO_4` solution

Answer :A
Discussion
11935.

Which of the following is not a colloid

Answer»

MILK
Blood
Ice cream
Sugar solution

Answer :D
Discussion
11936.

Which of the following represents a biliquid propellants

Answer»

Nitroglycerine + NITROCELLULOSE
`N_(2)O_(4)` + acrylic rubber
`N_(2)O_(4)` + unsymmetrical DIMETHYL hydrazene
None of these

Answer :C
Discussion
11937.

Two solutions initially at 25^(@)C were mixed in an adiabatic constant pressure calorimeter. One contains 400 ml of 0.2 M weak monoprotic acid solution. The other contain 100 ml of 0.80 M NaOH. After mixing temperature increased to 26.2^(@)C. How much heat is evolved in the neutralization of 1 mole of acid? Assume density of solution 1.0 g//cm^(3), and specific heat of solution 4.2 J/g-K. Neglect heat capacity of the Calorimeter.

Answer»


Solution :MASS= density `xx` vol. `=1xx500=500` gram
`DeltaT=1.2`
`q=mc.DeltaT=2520`
Heat released by 1 mole of ACID `=2520/0.08=-31500 J=-31.5 KJ`
Discussion
11938.

Which of the following on oxidation with alkaline KMnO_(4) followed by acidification with dil. HCl gives benzoic acid

Answer»

toluene
ethylbenzene
isopropylbenzene
tert-butylbenzene

Solution :tert-Butylbenzene does not undergo oxidation to yield BENZOIC ACID since it does not have BENZYLIC hydrogen.
Discussion
11939.

Which one of the following staternents is false?

Answer»

WORK is a STATE function.
Temperature is a state function.
CHANGE in the state is completely DEFINED when the INITIAL and final states are specified.
Work appears at the boundary of the system.

Answer :A
Discussion
11940.

Which cannot be oxidised by H_(2)O_(2) ?

Answer»

`Na_(2)SO_(3)`
`Na_(2)SO_(3)`
`Na_(2)SO_(3)`
`Na_(2)SO_(3)`

ANSWER :D
Discussion
11941.

The rms speed of gas, molectfles at a temperature27Kandpressure1.5 bar is 1 xx 10cm/sec: Ifboth temperature and pressure are raised three times, the rms speed of the gas will be:

Answer»

`9 XX 10^4 cm/sec`
`3 xx 10^4` cm/sec
`1 xx 10^4` cm/sec
`1 xx 10^4` cm/sec

Answer :D
Discussion
11942.

Which group has the maximum -I effect ?

Answer»

`-NO_2`
`CN`
`-COOH`
`-F`

ANSWER :A
Discussion
11943.

What is Electrometallurgy?

Answer»

SOLUTION :Electrometallurgy : It is a process of extraction of highly ELECTROPOSITIVE metals like Na, K, AL, etc. by ELECTROLYSIS of fused compounds of the metals where metal IONS are reduced at cathode forming metals.
Discussion
11944.

Which of the following dienes is the most stable?

Answer»


Solution :Conjugated DIENES are stablised by the delocalisation of FOUR pie ELECTRON over four carbon nuclei.
Discussion
11945.

Write structures and names of the compounds A to Qin the following reaction sequences: n-hexane overset(480-550^@C)underset(Cr_2O_3-Al_2O_3)toQ

Answer»

SOLUTION :
Discussion
11946.

Trichloroacetaldehydewas subjected toCannizzaro'sreactionby usingNaOH. Themixtureof theproductscontainssodiumtrichloroacetate and anothercompoundthe othercompoundis

Answer»

Trichloromethanol
2, 2, 2-Trichloropropanol
Chloroform
2,2,2-Trichloroethanol

Solution :`2CCI_(3) CHOoverset( OH^(-)) (to)CCI_(3)COON/A+ CCI_(3)CH_(2) OH`
Cannizzaroreactionis adisproportion REACTION. Onealdehyde MOLECULE isoxidisedto saltof thecarboxylicacidotherone isreducedto alcohol. Sothe COMPOUND is`CCI_(3)CH_(2) OH`
`IUPAC ` N/Ameis 2,2,2- Trichloroethanol
Discussion
11947.

Zn gives H_2 gas with H_2SO_4 and HCl but not with HNO_3 because

Answer»

Zn ACTS as oxidizing agent when reacts with `HNO_(3)`
`HNO_(3)`is WEAKER acid than`H_(2)SO_(4)` and HCl
In ELECTROCHEMICAL series Zn is above hydrogen
`NO_(3)^(-)`is reduced in preference to hydronium ion

Discussion
11948.

Which of the following compound statement is correct for [Co(EDTA)]^(-) complex compound?

Answer»

Number of `N-Co-O` LINKAGES are '8'
Coordination number of central metal ATOM in COMPLEX is '6'
EAN VALUE of central metal atom in complex is '36'
All of these

Solution :
No of `O-Co-N=8,C.n=6`
No. of `O-Co-O=6`
ENA=27-3+12=36`
Discussion
11949.

Which one of the following pairs is not correctly matched?

Answer»

`GT C=O to UNDERSET("Clemmensen reduction")(gt CH_(2))`
`C=O to underset("Wolff-Kishner reduction")(gt CHOH)`
`COCl to underset("Rosenmund reduction")(- CHO)`
`-C -= N to underset("Stephen reduction")(—СНО)`

Solution :Wolff-Kishner reduction does not CONVERT `gt CO` to `gt CHOH` but CONVERTS it to `gt CH_(2)`.
Discussion
11950.

The uncertainty in the momentum of a particle is 2.2 xx 10^(4)" g cms"^(-1). With what accuracy can its position be determined ?

Answer»

SOLUTION :`2.396xx10^(-24)m`
Discussion