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9901.

Which of the following dienes will give Diels Alder reactions?

Answer»


SOLUTION :Diels ALDER REACTION is GIVEN by only CONJUGATED diens.
Discussion
9902.

Which of the following is a 'd' block element ?

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Na
Fe
Mg
C

Answer :B
Discussion
9903.

Which of the following metals forms nitride with nitrogen /

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Lithium
Sodium
Rubidium
Caesium

Answer :A
Discussion
9904.

Unit of K for third order reaction is

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`(("litre")/("mole")) sec`
`(("mole")/("litre")) sec`
`(("litre")/("mole"))^(-1) sec^(-1)`
`(("mole")/("litre"))^(-1) sec^(-1) `

SOLUTION :UNIT of rate constant for a `N^(th)` order reaction is `(("LIT")/("mol"))^(n-1) sec^(-1)`
When n = 3 , the unit of rate constant is
`(("lit")/("mol"))^(2) sec^(-1)` or `(("mol")/("lit"))^(-2) sec^(-1)`.
Discussion
9905.

Which of the following metal sulphides will be precipitated first from a solution having almost equal concentration of metal ion ?

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`FES(K_(SP)=11xx10^(-20))`
`HgS(K_(sp)=3.2xx10^(-55))`
`ZnS(K_(sp)=1.1xx10^(-22))`
`CDS(K_(sp)=3.6xx10^(-31))`

Answer :B
Discussion
9906.

Write the expression for the equilibrium constant, K_(c) for each of the following reactions: I_(2)(s)+5F_(2)hArr 2IF_(5)

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SOLUTION :`K_(c)=([IF_(5)]^(2))/([F_(2)]^(5))` [As `I_(2)` is a pure solid its MOLAR concentration term does not appear in the equilibrium constant EXPRESSION].
Discussion
9907.

Which compound in each of the following pairs will react faster in S_(N^(2)) reaction with ""^(-)OH: (i) CH_(2)Br or CH_(3)I (ii) (CH_(3))_(3) C CI or CH_(3)CI ?

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SOLUTION :(i) `CH_(3)I`, (II) `CH_(3)CL`
Discussion
9908.

Which of the following coordination compotmds would exhibit optical isomerism?

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pentamminenitrocobalt(Ill) iodide
diamminedichloroplatimun(ll)
trans-dicyanobis (ethylenediamine) chromium (III) chloride
tris-(ethylendiamine) COBALT (ILI) bromide

Solution :The optical isomers are PAIR of molecules which are non SUPER IMPOSABLE mirror images of each other.

The two optically active isomers are collectivity calledenantiomers
Discussion
9909.

Which of the following can be easily undergo dehydration ?

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`CH_(3)CH_(2)-underset(OH)underset(|)overset(CH_(3))overset(|)C-CH_(2)CH_(3)`
`CH_(3)CH_(2)CH_(2)underset(OH)underset(|)CH-CH_(3)`
`CH_(3)CH_(2)CH_(2)CH_(2)OH`
`CH_(3)CH_(2)-underset(CH_(3))underset(|)CHCH_(2)CH_(2)OH`

Solution :`CH_(3)CH_(2)-underset(OH)underset(|)C-(CH_(3))CH_(2)CH_(3)` is giving rise most STABLE CARBOCATION HENCE it is easily dehydrated.
Discussion
9910.

Traces of oxygen from the fraction of Ar and O_2 is removed by passing over heated

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`CUO`
`Cu_2O`
`CU`
`CaC_2`

ANSWER :C
Discussion
9911.

Which of the following set of combination is correct ?

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(IV)-S-(i)
(III)-S-(iii)
(II)-Q-(ii)
(I)-Q-(iv)

Answer :B
Discussion
9912.

The value of rate of a pseudo first order reaction depends upon

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the concentration of both the reactants PRESENT in the reaction
the concentration of the reactant present SMALL amount
the concentration of the reactant present in excess
the value of `DELTA H` of the reaction.

Answer :B
Discussion
9913.

Upon treatment with ammoniacal H_(2)S, the metal ion that precipitates as a sulfide is:

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`FE(III)`
`Al(III)`
`Mg(II)`
`Zn(II)`

Solution :N//A
Discussion
9914.

Which of the following polymer has the emperical formula identical with that of it monomer

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Teflon
Nylon-6,6
DACRON
Bakelite

Answer :B
Discussion
9915.

The shape of cuprammonium ion is

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octahedral
SQUARE planar
trigonal
tetrahedral

Solution :SHAPE of `[CU(NH_(3))_(4)]^(2+)` is square planar.
Discussion
9916.

Which among the following has the maximum nucleophilicity?

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`F^(-)`
`OH^(-)`
`CH_(3)^(-)`
`NH_(2)^(-)`.

Solution :as the electronegativity of the atom holding the negative charge decreases its electron RELEASING tendency or nucleophilicity INCREASES. `CH_(3)^(-)` is the strongest NUCLEOPHILE because CARBON is the least ELECTRONEGATIVE.
Discussion
9917.

Which possesses tetrahedral shape (sp^(3)- hybridisation of central atom):

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`[Zn(NH_(3))_(4)]^(2+)`
`[Ni(CO)_(4)]`
`[Cu(NH_(3))_(4)]^(2+)`
None of these

Solution :`[Cu(NH_(3))_(4)]^(2+)` and `[Ni(CN)_(4)]^(2-)` are both SQUARE planar with `dsp^(2)` hybridization.
Discussion
9918.

Which of the following solution will have a pH of 10 (B is a weak base and its pK_b=5)

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75ML of (M/10)B+25mL of (M/10) HCl
55mL of (M/10)B+45mL of (M/20) HCl
50mL of 11/10)B+50mL of (M/10) HCl
40mL of (M/10)B+60mL of (M/10) HCl

Answer :C
Discussion
9919.

Which of the following solution in water ppossesses the lowest vapour pressure

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0.1 (M) NACL
`0.1 (N) BaCl_(2)`
0.1 (M) KCl
None of these

Solution :`BaCl_(2)` gives maximum ion hence it SHOWS LOWEST VAPOUR pressure.
Discussion
9920.

Which of the following have coiled helical structure

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Lipids
Carbohydrates
Vitamin
proteins

Answer :D
Discussion
9921.

What is 'X' in the following reaction ?CH_(3)-CH_(2)-Cl+KOH overset(CH_(2)CH_(2)OH)rarr X+KCl+H_(2)O

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BUTANE
Ethane
Ethene
Diethyl ether

Solution :`UNDERSET("Chloro ethane")(CH_(3)-CH_(2))-Cl+KOH OVERSET(CH_(3)CH_(2)OH)rarr underset("ethene")(CH_(2)=CH_(2))+KCl+H_(2)O`
Discussion
9922.

Which is an ozonide:

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`KO_3`
`NH_4O_3`
`Cr_2O_3`
BOTH (A) AND (B)

ANSWER :D
Discussion
9923.

Which of the following amines is optically active :

Answer»

`CH_3NH_2`
`CH_3NHCH_3`

SEC. BUTYLAMINE

ANSWER :D
Discussion
9924.

Write the structures of the major products expected from the following reactions: a) 3-methyl phenol is mononitrated b) Phenyl methanoate is mononitrated c) 3-Methyl phenol is dinitrated

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SOLUTION :The products formed depend UPON the COMBINED influence of -OH and -`CH_3`groups. Both the groups are o-and p-directing
Discussion
9925.

What is unit of rate of reaction?

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SOLUTION :MOLE `LITRE^(-1)SEC^(-1)`
Discussion
9926.

Which of the following statements is true about trisilylamine (A) is comparison to trimethylamine (B)?

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A is nonplanar while B is planar
A is STRONGER BASE than B
Both A and B have same structure
A INVOLVES `d pi-ppi` bonds while B does not..

ANSWER :C
Discussion
9927.

Which of the following metal can be extracted by smelting

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Al
Fe
Mg
All

Answer :B
Discussion
9928.

What is heat of adsorption ? Give the effect of temperature on physical adsorption and chemical adsorption.

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Solution : Heat of adsorption. It is the heat CHANGE that takes place when 1 mole of a substance gets adsorbed on the surface of another substance.
Effect of TEMPERATURE
(a) Physical adsorption. The extent of adsorption DECREASES with the increase in temperature, because the process of adsorption is exothermic and does not require appreciable energy of activation.

(B) Chemical adsorption . It is an exothermic process but REQUIRES energy of activation .Therefore the extent ofadsorption first inreases and then decreases as the temperature increases
Discussion
9929.

The white ZnO turns yellow on heating because of

Answer»

Frenkel DEFECT
Metal excess defect
Metal DEFICIENCY defect
Schottky defect

ANSWER :B
Discussion
9930.

Which of the following allotropic forms of carbon is isomorphous with crystalline silicon-

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GRAPHITE
COAL
COKE
DIAMOND

ANSWER :D
Discussion
9931.

What is the potential of an electrode which originally contained 0.1 MNO_(3)^(-) and 0.4MH^(+) and which has been treated by 60% of the cadmium necessary to reduce all the NO_(3)^(-) to NO(g) at 1 atm. Given, NO_(3)^(-) +4H^(+)+3e^(-)rarr NO+2H_(2)O, E^(@)=0.95V and log2=0.3010

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0.52 V
0.44
0.86 V
0.78 V

Answer :C
Discussion
9932.

The units of rate of reaction and rate constant are identical for a

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FRACTIONAL order REACTION
ZERO order reaction
FIRST order reaction
second order reaction.

Solution :For a zero order reaction,
`r=k[A]^(0)`
`therefore` r=k
Therefore, for a zero order reaction the UNITS of rate of reaction and rate constants are same.
Discussion
9933.

Which has maximum dipole moment ?

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ANSWER :B
Discussion
9934.

When a primary amine is warmed with carbon disulphide in the presence of mercuric the product is:

Answer»

carbylamine
alkyl isothiocyanate
mercaptan
alkyl CYANIDE

ANSWER :B
Discussion
9935.

Write the structure of 'A' and 'B' in the following reaction. C_(6)H_(5)MgBrunderset((ii)H_(2)O //H^(+))overset((i)CO_(2))toAunderset(FeBr_(3))overset(Br_(2))toB

Answer»

SOLUTION :
Discussion
9936.

Toluene on oxidation with chromyl chloride produces :

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Benzoic ACID
BENZALDEHYDE
Chlorobenzene
Chromium SALT of BENZENE

Answer :B
Discussion
9937.

When phenolic ether is heated with HI, it yields .

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ALKYL HALIDE + phenol
alcohol + ARYL halide
alkyl halide + aryl halide + water
NONE of the above

ANSWER :A
Discussion
9938.

Which is the comman oxidation state of the first transition series of elements ?

Answer»

`+2`
`+6`
`+8`
`+4`

ANSWER :A
Discussion
9939.

When primary amine reacts with chloroformin ethanolic KOH, then product is :

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an ISOCYANIDE
an ALDEHYDE
a cyanide
an alcohol

Solution :(a) Iso-cyanide TEST
Discussion
9940.

Which one is not antimicrobial drug ?

Answer»

Antibiotics
Antiseptic
Disinfectants
TRANQUILIZERS 

SOLUTION :Tranquilizers
Discussion
9941.

Which of the following is an exampleof homopolymer ?

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BAKELITE
TERYLENE
NYLON
POLYTHENE

ANSWER :D
Discussion
9942.

Which enzyme is present in yeast ?

Answer»

Invertase
ZYMASE
Cellulase
All of these

Solution :Zymase
Discussion
9943.

Which of the following combination is INCORRECT ?

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(II) (ii) ( R )
(II) (i) (S)
(III) (IV) (P)
(IV) (iii) (Q)

Answer :A
Discussion
9944.

Which of the following nuclear reactions is incorrect?

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<P>`(59)/(27)Co(n,(2)/(1)H)(56)/(23)Mn`
`""_5B^(10)(a,""_0n^(1))(13)/(7)N`
`(9)/(4)Be(a,""_0n^(1))(12)/(6)C`
`(63)/(29)CU(p,(2)/(1)H)(62)/(29)Cu`

Answer :A
Discussion
9945.

What is the rate law for the reaction, NO_(2(g)) + CO_((g)) to NO_((g)) + CO_(2(g)) The reaction occurs in the following steps :(i) NO_(2) + NO_(2) to NO_(3) + NO (Slow) (ii) NO_(3) + CO to NO_(2) + O_(2) (fast) What is the role of NO_(3) ?

Answer»

Solution : Overall reaction: `NO_(2(G)) +CO_(2(g)) to NO_((g)) + CO_(2(g))`
Step - I : `NO_(2) +NO_(2) to NO_(3) + NO` (slow)
Step -II : `NO_(3) + CO to NO_(2) +CO_(2)` (FAST)
(A) From first rate determining slow step, rate law is, Rate `= K [NO_(2)]^(2)`
(B)Role of `NO_(3)` : In the reaction, `NO_(3)`is the reaction INTERMEDIATE which is formed in first step and removed in the second step.
Discussion
9946.

What is the osmotic pressure of a solution of 4.48g of a substance of molecular weight 286 in 100cm^(3) water at 298K?

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SOLUTION :`R=82.1cm^(3)` atm/deg/mole
Discussion
9947.

Which one of the strongest acid?

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2 - NITROPHENOL
4 - chlorophenol
4 - nitrophenol
3 - nitrophenol

Solution :4 - nitrophenol
Discussion
9948.

Using IUPAC norms, write the systematic names of the following: [Ni(CO)_(4)]

Answer»

SOLUTION :TETRACARBONYLNICKEL(0).
Discussion
9949.

Which of the following is a free radical susbtitution reaction

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SOLUTION :Chlorination is a FREE RADICAL SUBSTITUTION REACTION .
Discussion
9950.

Write the name, stereochemistry and magnetic behaviour of the following : K_(4)[Mn(CN)_(6)]

Answer»

Solution :Potassium hexacyanomanganate(II)
Stereochemistry : MN undergoes `d^(2)sp^(3)` hybridisation. Hence, the shape is octahedral.
Magnetic behaviour: Due to the PRESENCE of one unpaired ELECTRON, the compound is PARAMAGNETIC.
Discussion