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22251.

Which of the following organic compounds will give white precipitate with AgNO_(3) ?

Answer»

`C_(6)H_(5)NH_(3)^(+)Cl^(-)`
NaCl
2,4,6-Trinitrochlorobenzene
BENZYL chloride

Solution :All COMPOUNDS on react with `AgNO_(3)` give white ppt due to farmation of AgCI
Discussion
22252.

The tendency to exhibit -3 oxidation state by a group VA element decreases down. Why?

Answer»

Solution :Nitrogen exhibits `-3` STATE in nitride and PHOSPHORUS exhibits`-3` state in phosphide. GOING down the group, the atomic size increases and metallic character ALSO increases. Hence, the tendency to exhibit negative oxidation state decreases down the group VA.
Discussion
22253.

Which is not similar characteristics(s) about the electronic configuration of Be, Mg, Ca?

Answer»

All the atojms have a pair of s-electrons in their OUTERMOST ENERGY level
all the ATOMS contain a pair of p-electrons in their outermost energy level
All are alkaline EARTH metals
All are of SECON group of the periodic table

Answer :B
Discussion
22254.

Which of the following is the major product obtained by sulplination of P-CH_(3)-C_(6)H_(4)overset(+)NH_(3)+Cl^(-)

Answer»




SOLUTION :
WEAKLY ativating group directs the `E^(+)` ATTACK
Discussion
22255.

Write down the major product in the following reaction with possible mechanism

Answer»

Solution :It is an example of Favorsky rearrangement reaction. When `alpha`-halogenocyclohexanone (i.e., six membered RING) is treated with alkali (NaOH) followed by ACIDIFICATION forms cyclopentane carboxylic acid ( a five membred ring carboxylic acid).
Mechanism : Base abstracts acidic `alpha`-H atom from `alpha`-haloketone, followed by `S_(N^(2))` DISPLACEMENT of `CL^(-)` to give a bicycloketone. Ring opening followed by acidification gives cyclopentane carboxylic acid.
Discussion
22256.

When an ideal gas is compressed adiabatically and reversibly, the final temperature is:

Answer»

HIGHER than the INITIAL temperature
Lower than the initial temperature
The same as the initial temperature
Dependent on the RATE of compression

Answer :C
Discussion
22257.

The transition metals have last electron entering into (n-1) d-orbital, where d-orbital are degenerate. Colour of transition metal ions is due to absorption of light of some wavelength. This result in transition of electron which is

Answer»

d-s TRANSITION
d-d transition
d-p transition
both 'a' and 'B'

Answer :B
Discussion
22258.

The substance 'X'when dissolved in solvent water gave molar mass corresponding to the molecular formula X_(3). The van't Hoff factor (i) is

Answer»

3
`0.33`
`1.3`
1

Answer :B
Discussion
22259.

Write the name and structure of one of the common initiators used in free radical addition polymerisation.

Answer»

SOLUTION :BENZOYL PEROXIDE ,
Discussion
22260.

Which of the following statements is not valid for oxo-acids of phoshorus?

Answer»

Hypopphosphorus acid is a DIPROTIC acid
All oxo--acid CONTAINS atleast one `P=O` unit and one `P-OH` GROUP
Orthophosric acid is used in the manufacture of triple superphosphate
All oxo-acid CONTAIN tetrahedral four coordinate phosphorus

Solution :Hypophosphorus acid is MONOPROTIC acid as only one `H` is attached on oxygen atom. `H` atoms attached on `O` are ionisable.
Discussion
22261.

When dispersed phase is solid and dispersion medium is gas, the colloidal system is

Answer»

Smoke
Clouds
Emulsion
Milk

Answer :A
Discussion
22262.

Which of the following is not corrextly matched with the given example ?

Answer»

An element of FIRST transition series which has HIGHEST second ionisation enthalpy - Cu.
An elementof first transition series with lowest THIRD ionisation enthalpy - Zn.
An element of first transition series with lowest enthylpy of atomisation - Zn.
An element of first transition series with lowest enthalpy of atomisation -Zn.

Solution :Hg is the last element of third trasition series.
Discussion
22263.

The various fluorides formed with sulfur are .........., and with tellurium are ...........,and ...............

Answer»

SOLUTION :`SF_2,SF_4,SF_6 : TeF_4,TeF_6`
Discussion
22264.

Two isomeric alkenes A and B having molecular formula, CH_(9)H_(9) Clon adding H_(2), A gives optically inactive compound while B gives a chiral compound. The two isomers are

Answer»

A is 3-chloro-1-pentene and B is 1-chloro-2- pentene
A is 2-chloro-3-methyl-2-butene and B is 1-chloro-3-methyl-1-butene
A is 3-chloro-2-pentene and B is 2-chloro-2- pentene
A is 4-chloro-2-pentene and B is 4-chloro-1- pentene.

Solution :Only OPTION (C) is correct as shown.
`CH_(3) CH_(2) underset(3 - "chloro-2 - pentene(A)")overset(CL) (C = CH -) CH_(3) overset(H_(2))(rarr) CH_(3)CH_(2)underset("OPTICALLY INACTIVE ")overset(Cl)overset(|)(- CH -) CH_(2) CH_(3)`
`CH_(3) CH_(2) underset(3 - "chloro-2 - pentene(B)")overset(Cl) (C = CH -) CH_(3) overset(H_(2))(rarr) CH_(3)CH_(2)underset("optically inactive ")overset(Cl)overset(.|)(- CH -) CH_(2) CH_(3)`
Discussion
22265.

Which of the following is a vicinal dihalides ?

Answer»

`CH_(3)-underset("Br ")underset("| ")("C ")H-underset("Br ")underset("| ")("C ")H_(2)`
`underset("Br ")underset("| ")("C ")H_(2)-CH_(2)-underset("Br ")underset("| " )("C ")H_(2)`
`CH_(3)-overset("Br ")overset("| ")underset("Br ")underset("| ")("C ")-CH_(3)`
All of these

Answer :A
Discussion
22266.

Which of the following statements is not true about the hexagonal close packing ?

Answer»

The coordination NUMBER is 12
It has 74% packing efficiency
Tetrahedral voids of the second layer are covered by the SPHERES of the third layer
In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer

Solution :In HCP close packing, the spheres of the third layer are exactly aligned with the spheres of the first layer.
Discussion
22267.

What volume of oxygen at STP is required to affect combustionat 200 cm^(3) of acetylene and what would be the volume of carbon dioxide formed ?

Answer»


SOLUTION :N/A
Discussion
22268.

Which of the following gas molecules has the lowest average speed at 0^(@)C ?

Answer»

`CH_(4)`
`CO_(2)`
`C_(2) H_(6)`
`CO`

Answer :B
Discussion
22269.

Unlike dry cell, the mercury cell has a constant cell potential throughout its useful life. Why ?

Answer»

SOLUTION :* Because, in total reaction of mercury cell no ion is taking part in reaction.
* In mercury cell, zinc amalgum is used as anode and HGO and carbon PEST is used as cathode. So the chemical reaction occur on electrodes are as follows:
Cathode: `HgO+H_(2)O+2e^(-) to Hg_((L))+2OH^(-)`
Anode : `underline(Zn(Hg)+2OH^(-) ZnO_((S))+H_(2)O+2e^(-))`
Total reaction : `Zn(Hg)+HgO_((S)) to ZnO_((S))+Hg_((l))`
* During whole LIFE span the cell potential of 1.35 V is constant because, no ions are present in overall cell reaction.
Discussion
22270.

Which of the following metal is purified by distilation process?

Answer»

Zn
Fe
Al
Cu

Answer :A
Discussion
22271.

Write name and structure of monomers of following polymer : Nylon-6

Answer»

SOLUTION :CAPROLACTUM
Discussion
22272.

The reduction of benzoyl chloride with Pd_____BaSO_4 produces_____.

Answer»

BENZOYL CHLORIDE
Benzaldehyde
Benzoic acid
None of these

Answer :A::B::D
Discussion
22273.

X-rays are produced due to

Answer»

Bombarding of ELECTRONS on solids
Bombarding of `alpha`-PARTICLES on solids
Bombarding of `GAMMA`-rays on solids
Bombarding of neutron on solids

Answer :A
Discussion
22274.

Which compounds will not reduce Fehling.s solution:

Answer»

Methanal
Ethanal
Trichloroethanal
Benzaldehyde

Answer :D
Discussion
22275.

Which of thefollowingcompoundwill given yellowprecipitateon shakingwithaqueoussolutionofNaOHfollowedby theadditionof AgNO_(3) solution ?

Answer»

`CoCl_(3).6NH_(3)`
`CoCl_(3).5NH_(3)`
`CoCl_(3).4NH_(3)`
All of the above

Answer :D
Discussion
22276.

Which order of reaction obeys the relation t_(1//2)=1//k ?

Answer»

first
SECOND
third
zero

Solution :For `1^(st)` order reaction `k = (2.303)/(t) "LOG" (a)/(a-x)`
if `x = (a)/(2) , t_(1//2) = (1)/(k)`
Discussion
22277.

To an acidified dichromate solution, a pinch of Na_(2)O_(2) is added and shaken. What is observed:

Answer»

BLUE COLOUR
Orange colour CHANGING to GREEN
No EVOLUTION of oxygen
Bluish - green precipitate

Answer :A
Discussion
22278.

Which of the following statements justifies the dual behaviour of atmosphere after learning the reactions ? 2S_(2)O_(3)^(2-)+I_(2) too S_(4)O_(6)^(2-)+2I^(-) S_(2)O_(3)^(2-)+2Br+5H_(2)O to 2SO_(4)^(2-)+2Br^(-)+10H^(+)

Answer»

bromine is stronger OXIDANT than IODINE
bromine is weaker oxidant than iodine
thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions
bromine undergoes oxidation and iodine undergoes reduction in these reaction

Solution :`2S_(2)O_(3)^(2-) "" S_(2)O_(3)^(2-) to SO_(4)^(2-)`
`S^(2+) to S^(5+) + 3e^(-) "" S^(2+) to S^(3+) + e^(-)`
Discussion
22279.

Which of the following will show Tyndall effect ?

Answer»

Aqueous SOLUTION will showbelow CRITICAL micelle concentration.
Aqueous solution of SOAP above critical micelle concentration.
Aqueous solution of SODIUM chloride.
Aqueous solution of sugar.

Answer :B
Discussion
22280.

Which of the following can be the isomer(s) of C_(8)H_(8)O:

Answer»




SOLUTION :N//A
Discussion
22281.

Which of the following complexes ionization isomerism ?

Answer»

`[Cr(NH_(3))_(6)]Cl_(3)`<BR>`[Cr(en)_(2)]Cl_(2)`
`[Cr(en)_(3)]Cl_(3)`
`[Co(NH_(3))_(5)Br]SO_(4)`

Solution :(1) No ANIONIC ligand is present in coordination sphere for the exchange with `Cl^(-)` ion present in ionisation sphere.
(2) No anionic ligand is present in coordination sphere for the exchange with `Cl^(-)` ion present in ionisation sphere.
(3) No anionic ligand is present in coordination sphere for the exchange with `Cl^(-)` ion present in ionisation sphere.
(4) `Br^(-) and SO_(4)^(-)` can exchange their positions between coordination sphere and ionisation sphere. Hence it shows ionization ISOMERISM.
Discussion
22282.

Which of the following statements is not correct from the viewpoint of molecular orbital theory?

Answer»

`Be_2` is not a stable molecule
`He_2` is notstable but `He_2^+` is EXPECTED to exist
Bond strength of `N_2` is maximum AMONGST the homonuclear DIATOMIC molecules
The order of energies of molecular orbitals in `F_2` molecule is`E(SIGMA2S)ltE(sigma^ast2s)ltE(2pip_x)=E(pi2p_y)ltE(sigma2p_z)ltE(pi^ast2p_x)=E(pi^ast2p_y)ltE(sigma^ast2p_z)`

Answer :D
Discussion
22283.

What is unit of zero order reaction ?

Answer»

`s^(-1)`
`mol^(-1)L^(-1)s^(-1)`
`mol L^(-1)s^(-1)`
`mol LS^(-1)`

ANSWER :C
Discussion
22284.

Which of the following bonds has the highest energy?

Answer»

Se-Se
Te-Te
S-S
O-O

Solution :S-S BOND ENERGY is highest DUE sulphur E.A is GREATER
Discussion
22285.

Tintanium containing miniral found in our country is

Answer»

Bauxite
Dolomite
Chalcopyrites
Elmanite

Answer :D
Discussion
22286.

Which of the following is NOT a tranquilizer?

Answer»

MEPROBAMATE
Equanil
Chlordiazepoxide
BROMOPHENIRAMINE

SOLUTION :Bromopheniramine- ANTIHISTAMINE
Discussion
22287.

What is popoff's rule? Explain with an example.

Answer»

Solution :The oxidation of unsymmetrical ketones is GOVERNED by Popoff.s rule. It STATES that during the oxidation of an unsymmetrical ketone, a (C-CO) bond is CLEAVED in such a way that the keto group stays with the smaller ALKYL group. Example:
`underset("2-pentanone or pentan-2-one")(CH_3-CH_2-CH_2-undersetoverset(||)(O)(C )-CH_3) underset(conc.HNO_3)OVERSET((O))(to) underset("propanoic acid")(CH_3-CH_2-COOH)+ underset("acetic acid")(CH_3COOH)`
Discussion
22288.

The value of equillibrium constants depends on _____ and _____.

Answer»


ANSWER :NATURE of the REACTION and TEMPERATURE
Discussion
22289.

Which one of the following statements is wrong for gases?

Answer»

Gases do not have a definite shape and volumne
Volume of the gas is EQUAL to the volume of the container confining the gas
Confined gas exerts uniform PRESSURE on the WALLS of its container in all directions
Mass of the gas cannot be determined by weighing a container in which it is enclosed

Solution :The mass of gas can be determined by weighing the container, FILLED with gas and again weighing this container after removing the gas. The DIFFERENCE beetween the two weights gives the mass of the gas.
Discussion
22290.

Which of the following crystals are not covalent ?

Answer»

`CO_(2)`
`SiO_(2)`
BaO
`CsNO_(3)`

Answer :A::C::D
Discussion
22291.

Which of the following is the correct electronic configuration of copper?

Answer»

`[Ar] 3D^(5) 4s^(1)`
`[Ar] 3d^(10) 4s^(1)`
`[Ar] 3d^(9) 4s^(2)`
`[Ar] 3d^(8) 4s^(2)4p^(1)`

Solution :`[Ar] 3d^(10) 4s^(1)`
Discussion
22292.

The thermal dissociation equilibrium of CaCO_(3)(s) is studied under different conditions CaCO_(3)(s)hArrCaO(s)+CO_(2)(g) For this equilibrium, the correct statements are (i) K is dependent on the pressure of CO_(2) at a given T. (ii) Delta H is dependent on T. (iii) Delta H is independent of the catalyst, if any. (iv) K is independent of the initial amount of CaCO_(3).

Answer»

`DeltaH` is dependent on T
K is independent of the initial AMOUNT of `CaCO_3`
K is dependent on the pressure of `CO_2` at a GIVEN T
`DeltaH` is independent of the catalyst , if any

Answer :C
Discussion
22293.

Which of the following compounds has the most acidic nature

Answer»




SOLUTION :
Discussion
22294.

When a white crystalline compound X isheatedwith K_(2)Cr_(2)O_(7) andconcentratedH_(2)SO_(4) a reddishbrowngas A isevolved On passing A intosausticsodasolution ,ayellowcoloured solution of Bwith acetic B is obtained .Neutradiding thesolutionof B withaceticacid and onobtaijnedwhen Xof leadacetatewith NaOHsolutionprecipitate C isobtainedwhen Xis heatedwithNaOHsolutiona colouelessgas isevolvedand on passingthe gas into K_(2)HgI_(4) solution a reddishbrownprecipitate D isformedidentifyA,B,C and D and Xwritetheequationof thereactioninvolved.

Answer»

SOLUTION :REACTIONS are as :
Compound `X = NH_(4)CI,A = CrO_(2)CI_(2),B = Na_(2)CrO_(4),C = PbCrO_(4) ,D = NH_(2)(HGO)HgI + 3H_(2)O`
i. `4NH_(4)CI(X) + K_(2)Cr_(2)O_(7) + 6H_(2)SO_(4) rarr 2CrO_(2)CI_(2)(A) + 4NH_(4)HSO_(4) + 2KHSO_(4)`
ii `CrO_(2)CI_(2)(A) + 2NaOH rarr Na_(2)CrO_(4)(B) +2HCI`
iii. `Na_(2)CrO_(4)(B) + (CH_(3)COO)_(2)Pb rarr PbCrO_(4)(C ) + 2CH_(3)COONa`
iv. `NH_(4)CI + NaOH rarr NACI + NH_(3) +H_(2)O`
v.`K_(2)HgI_(4) + NH_(3) + 3KOH rarr NH_(2)(HgO)HgI(D) + 7KI + 2H_(2)O`
Discussion
22295.

Write the structures of the following organic halogen compounds.1,4-Dibromobut-2-ene

Answer»

SOLUTION :`BR-CH_(2)-CH=CH-CH_(2)-Br`
Discussion
22296.

Which one of the following has an optical isomer ?

Answer»

`[Co(H_(2)O)_(4) (en)]^(3+)`
`[Zn (en)_(2)]^(2+)`
`[Zn(en)(NH_(3))_(2)]^(2+)`
`[Co(en)_(3)]^(3+)`

SOLUTION :`[Co(en)_(3)]^(3+)` exists as enantiomeric PAIR and shows optical activity.
Discussion
22297.

which of the following statement is correct for the reactivity in S_(N)2 reaction ?

Answer»




is more REACTIVE than

Answer :B
Discussion
22298.

What is Zeigler -Natta catalyst? In which reaction it is used? Give equation.

Answer»

SOLUTION :A MIXTURE of `TiCI_(4)` andtrialkyl aluminiumisused forpolymerization .
Discussion
22299.

Which is mixmatched-

Answer»

`C_(2)H_(5)-C_(2)H_(5)`FOUR primary carbon atoms
`CH_(3)-CH_(2)-CH(OH)CH_(3)`Optical active
`CH_(3)-O-CH(CH_(3))_(2)`Two secondary carbon atoms
Ether is heated with `CH_(3)COCl` in presence of `AlCl_(3)` to GIVE `CH_(3)COOC_(2)H_(5)+C_(2)H_(5)CL`

Solution :
Discussion
22300.

The word neon signifies:

Answer»

New
Old
Strange
None

Answer :A
Discussion