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8351.

Whichcompound is formedwhen excess of KCN is added to an aqueoussolutionof copper sulphate ?

Answer»

`Cu(CN)_(2)`
`K_(2)[Cu(CN)_(4)]`
`K[Cu(CN)_(2)]`
`K_(3)[Cu(CN)_(4)]`

SOLUTION :`2CuSO_(4) + 10KCN rarr 2K_(3)[Cu(CN)_(4)] + 2K_(2)SO_(4)+ (CN)_(2)` first `Cu(CN)_(2)` is formed which DECOMPOSES to form `(CN)_(2)` and `Cu_(2)(CN)_(2). Cu_(2)(CN)_(2)` then combines with KCN to form `K_(3)[Cu(CN)_(4)]`
Discussion
8352.

Which of the following reaction does not takes place.

Answer»

`F_(2)+2CL^(-)to2F^(-1)+Cl_(2)`<BR>`Br_(2)+2I^(-)to2Br^(-)+I_(2)`
`Cl_(2)+2F^(-)to2Cl^(-)+F_(2)`
`Cl_(2)+2Br^(-)to2Cl^(-)+Br_(2)`

Answer :C
Discussion
8353.

Which of the following relations is (are) correct according to Freundlich ? (i) x/m = constant (ii) x/m = constant xx p^(1//n) (n gt 1) (iii) x/m = constant xx p^(n) (n gt 1)

Answer»

All are correct
All are wrong
(ii) is correct
(III) is correct

Solution :According to Freundlich ADSORPTION isotherm, `(x)/(m) prop KP^(1//n) (n gt 1).`
Discussion
8354.

What makes acetic acid a stronger acid than phenol?

Answer»

Solution :GREATER RESONANCE stabilization of ACETATE ion over phenoxide ion.
Discussion
8355.

Why amines are more basic than the comparable alcohols ?

Answer»

Solution :Because they have .N. which has more tendency to DONATE electrons than OXYGEN DUE to LESS electronegativity of nitrogen as COMPARED to oxygen.
Discussion
8356.

Which of the following statements about primary amines is 'False'?

Answer»

ALKYLAMINES are stronger bases than ammonia
Alkylamines are stronger bases than aryl amines
Alkylamines react with nitrous acid to produce alcohols
Arylamines react with nitrous acid to produce phenols

Solution :Arylamines react with `HNO_(2)` to form diazonium salts.
Discussion
8357.

Which of the following isomerism, exhibited by [CrCl_(2)(OH)_(2)(NH_(3))_(2)]^(-)?

Answer»

Ionization
Geometrical
Hydrate
Linkage

Solution :`[CrCl_(2)(OH)_(2)(NH_(3))_(2)]` show cis and trans isomerism, cis isomer is optically active.
Discussion
8358.

Who prepared non aqueous inflammable liquids like Benzene and ether by Bredig's arc method?

Answer»

GEORGE Bredig
SVED BERG
Thomas GRAHAM
ROBERT Brown

Solution :Sved berg
Discussion
8359.

Which of the following carbonium ion is most stabie?

Answer»




ANSWER :C
Discussion
8360.

Which one of the following is strongest acid

Answer»

2 - chloropentanoic ACID
3 - chloropentanoic acid
5 - chloropentanoic acid
4 - chloropentanoic acid

Answer :A
Discussion
8361.

Zeolites are shape selective catalysts because of :

Answer»

HIGH adsorption capacity
three dimensional NETWORK of atoms
presence of aluminosilicates
honey COMB LIKE structure.

Answer :D
Discussion
8362.

Which of the following substances when heated loses ferrimagnetism and becomes paramagnetic ?

Answer»

`CrO_2` 
`H_2O`
`MNO`
`Fe_3O_4 `

ANSWER :D
Discussion
8363.

Which of the following have same configuration.

Answer»

I & II
II & III
I & III
All

Answer :A
Discussion
8364.

What is rate law?Give a relation between rate of reaction and concentration of reactant?

Answer»

Solution :Rate of REACTION depends UPON the experimental condition such as concentration of reactants (pressure in case of gases),temperature and catalyst.The rate of chemical reaction at a given temperature may depend on the concentration of one or more reactants and products.
The representation of rate of reaction in terms of concentration of the reactants is known as rate law.It is ALSO CALLED as rate equation or rate expression.
The rate of a reaction decreases with the passage of time as the concentration of reactants decrease. Conversely rate GENERALLY increase when reactant concentration increase.
`therefore` Rate of reaction`prop` concentration of reactants
So,rate of a reaction depends upon the concentration of reactants.
Discussion
8365.

Which statement is not correct about H_3BO_3 ?

Answer»

It is a strong TRIBASIC acid
It has a layer structure in which planar `BO_3` UNITS are joined by hydrogen bonds
It is PREPARED by acidifying an AQUEOUS solution of borax
It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ION

Answer :A
Discussion
8366.

Which of the following polymers is obtained by condensation polymerization ?

Answer»

PVC
Polythene
Nylon-6,6
POLYSTYRENE

SOLUTION :Nylon-6,6
Discussion
8367.

Which one of the following is incorrect for ideal solution ?

Answer»

<P>`DeltaH_"mix"=0`
`DeltaU_"mix"=0`
`DeltaP=P_"OBS"-P_"CALCULATED Raoult's law"=0`
`DeltaG_"mix"=0`

Answer :D
Discussion
8368.

Which of the following is formed when ethanoic acid is warmed with HN_(3) in the presence of conc. H_(2)SO_(4) ?

Answer»

Methylamine
Ethanamide
Ethanamine
Oxamide.

Solution :This reaction is Schmidt reaction. It INVOLVES the formation of `RNH_(2)` from `RCOOH`, when the later is WARMED with hydrazoic acid in the presence of conc. `H_(2)SO_(4)`.
`RCOOH+HN_(3) overset("conc. "H_(2)SO_(4)) RNH_(2)+CO_(2)+N_(2)`
`CH_(3)COOH + HN_(3) overset("conc. "H_(2)SO_(4))(rarr) CH_(3)NH_(2)+CO_(2)+N_(2)`
Discussion
8369.

Which is the kinetic phenomenon

Answer»

Brownian motion
Tyndall effect
Both (1) and (2)
NONE of these

Answer :A
Discussion
8370.

Which one of the following is water insoluble and stable at room temperature?

Answer»

`C_6H_5N_2Cl`
`C_6H_5N_2HSO_4`
`C_6H_5N_2BF_4`
`C_6H_5N_2Br`

ANSWER :C
Discussion
8371.

Which of the following is a chemical twins?

Answer»

AG and Au
CU and Ni
ZR and Hf
Cl and Br

Answer :C
Discussion
8372.

Which of the following is a branched polymer ?

Answer»

Low density POLYTHENE
POLYESTER
Nylon
PVC.

Answer :A
Discussion
8373.

z The compound B is

Answer»




SOLUTION :.
`beta`-KETO ACID undergoes decarboxylation when HEATED.
Discussion
8374.

Whichcompoundcan exist ina dipolar state ?

Answer»

`C_(6)H_(5)CH_(2)CH (N = CH_(2))CO OH`
`(CH_(3))_(2) CH - CH(NH_(2)) CO OH`
`C_(6)H_(5)CONH CH_(2) CO OH`
`HO OC - CH_(2) - CH_(2) - CO - CO OH`

Answer :B
Discussion
8375.

Which is ( are ) insoluble in water ?

Answer»

`PbSO_(4)`
`PbCrO_(4)`
`CaF_(2)`
`Ag_(2)S`

SOLUTION :`PbSO_(4), PbCrO_(4), CaF_(2)` and `Ag_(2)S` are almost insoluble
Discussion
8376.

Which of the following reaction could safely be used to relate configuration? (i) (+)-CH_(3)CH_(2)CHOHCH_(3)overset(Na)rarr CH_(3)CH_(2)CH(ONa)CH_(3)overset(C_(2)H_(5)Br)rarr C_(2)H_(5)-O-CH(CH_(3))CH_(2)CH_(3) (ii) (+)-CH_(3)CH_(2)underset(O)underset(||)C-.^(18)OCH(CH_(3))C_(2)H_(5)+OH^(-)rarrCH_(3)CH_(2)COO^(-)+CH_(3)CH_(2)CH^(18)OHCH_(3) (iii) (+)-CH_(3)CH(OH)CH_(2)Br+NaCNrarr CH_(3)CH(OH)CH_(2)CN (iv) (-)-C_(6)H_(5)CH(OC_(2)H_(5))CH_(2)OH+Hbrrarr C_(6)H_(5)(OC_(2)H_(5))CH_(2)Br

Answer»

(i),(ii),(iii)
(i),(ii),(iii),(IV)
(i),(iii)
(ii),(iv)

Solution :In these reactions NONE of the bonds to chiral carbon is broken and thus the CONFIGURATION AROUND the chiral carbon is retained.
Discussion
8377.

Which of the following is acidic

Answer»

`CH_(3)OH`
`C_(6)H_(5)OH`
`(CH_(3))_(2)CHOH`
`CH_(3)CH_(2)OH`

SOLUTION :Due to the resonance stabilisation of phenoxide ION.
Discussion
8378.

Two g of hydrogen diffuse from a container in 10 minute. How many gram of oxygen would diffuse through the same container in the same time under similar conditions:

Answer»

5 g
4 g
6 g
8 g

Answer :D
Discussion
8379.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K. If the value of A is 4xx10^(10)s^(-1) calculate k at 318 K and E_(a).

Answer»

Solution :At `10%` completion x = 0.10a.
Substituting the values in the FIRST order equation, we get
`k_(298K) =(2.303)/(t_(1))"log"(a)/(a-0.10a)= (2.303)/(t)"log"(10)/(9)=(2.303)/(t)(0.0458)=(0.1055)/(t)`
or `t_(1)=(0.1055)/(k_(298K))`
At 25% completion x = 0.25 a.
Substituting the values in the first order equation, we get
`k_(308K)=(2.303)/(t_(2))"log"(a)/(a-0.25a)=(2.303)/(t_(2))"log"(4)/(3)=(2.303)/(t_(2))(0.125)=(0.2879)/(t_(2))`
or `t_(2)=(0.2879)/(k_(308K))`
But `t_(1)=t_(2)`
Hence, `(0.1055)/(k_(298K))=(0.2879)/(k_(308K)) or =(k_(308K))/(k_(298K))=2.7289`
Substituting the values in Arrhenius equation, we get
`"log"(k_(308K))/(k_(298K))=(E_(a))/(2.303R) ((T_(2)-T_(1))/(T_(1)T_(2)))`
`therefore log(2.7289)=(E_(a))/(2.303xx8.314J K^(-1)"mol"^(-1)) xx ((308-298)K)/(298K xx 308K)`
or `0.4360=(E_(a))/(2.303xx8.314)xx(10)/(298xx308)`
or `E_(a)=76.623"kJ mol"^(-1)`.
Calculation of k at 318 K.
`logk=logA-(E_(a))/(2.303RT)=log(4xx10^(10))-(76623JK^(-1)"mol"^(-1))/(2.303xx8.314"J K"^(-1)"mol"^(-1)xx318K)`
`=10.6021-12.5843= -1.9822`
or `k="Antilog"(-1.9822)="Antilog"(bar2.0178)=1.042xx10^(-2)s^(-1)`.
Discussion
8380.

Which hetero cyclic base is absent in DNA ?

Answer»

Adanine
Guanine
Uracil
Thymine

Answer :C
Discussion
8381.

Which of the following statements regarding thiosulphate ion is incorrect

Answer»

Shape of theiosulphat ion is tetrahedral
The TWO sulphur ATOMS in thiosulphate ion are equivalent
There is S - S bond in thiosulphate ion
with IODINE thisoulphate ion is tetrathionat ion

Answer :B
Discussion
8382.

Which of the following statements "is"//"are" wrong?

Answer»

Beilstein test is RELIABLE test for halogens in organic compounds
In LASSAIGNE's test for N, Prussian blue COLOUR is due to the formation of ferro-ferri cyanide
When FeCl3 solution is added to the Lassaigne's extract, ablue solution is obtained, which indicates the presence of both N and S
Molecular mass of an ACID = `"Equivalent mass" xx "acidity"`

Solution :a) Urea and thio urea also GIVEN Beilstein test
b) In Lassaigne.s test, prussion blue colour is due to formation of Ferri Ferro cyanide
c) In Lassaigne.s test, blood red color given due to presence of N and S
Discussion
8383.

Which of the following compounds will have the highest melting point and why ?

Answer»

SOLUTION :Will have highest melting POINT due to its SYMMETRICAL STRUCTURE.
Discussion
8384.

Which one of the following is the metal deficiency defect ?

Answer»

`FEO`
`ZNO`
`KCI`
`NACI`

ANSWER :A
Discussion
8385.

What is conductivity cell constant ? Give a note on conductivity cell constant (""^(*)G).

Answer»

SOLUTION :* The quantity `((l)/(A))` is called cell constant denoted by the symbol `G^(**)(G^(**)=((l)/(A)))`
Where, l=distance between two ELECTRODES of cell , A=cross sectional area
* If we know land A. Measurement of l and A is not only inconvenient but also unreliable.
* (A) Measurement of cell resistance :
* Only one type of conductivity cell is used during the routine experiments.
* The cell constant is usually determined by measuring the resistance of the cell containing by measuring the resistance of the cell containing solution whose conductivity is already known.
* For this purpose, we generally use KCl solutions whose conductivity is known accurately at various concentrations and at different temperatures.

* 0.1 M KCl solution is to be filled in conductivity cell and then resistance of cell can be MEASURED, By this was cell constant can be measured.
* (B) Procedure: By filling the concentration cell with known concentration of KCl and then it is attached with Wheatstone bridge by attaching with AC current source.
* (C) Calculation of cell constant `G^(**):(G^(**)=((l)/(A))=Rkappa)`
Where, R=resistance of KCl solution experimental VALUE.
`kappa`=conductivity of KCl obtained from the table.
`G^(**)`=cell constant, whose calculation can be done at laboratory temperature.
Note: by this way cell constant can be measured and it is used to measure the conductivity of any solution.
Discussion
8386.

The reagent used to distinguish between acetaldehyde and benzaldehyde is

Answer»

TOLLENS reagent
Fehling's SOLUTION
2,4 – dinitrophenyl hydrazine
semicarbazide

Solution :Fehling.s solution
Discussion
8387.

Which of the following has a branched chain structure?

Answer»

Amylopectin
Amylose
Cellulose
Nylon

Answer :A
Discussion
8388.

What are X and Y in the following reaction sequence C_(2)H_(5)OH overset(Cl_(2))toX overset(Cl_(2))toY

Answer»

`C_(2)H_(5)Cl, CH_(3)CHO`
`CH_(3)CHO, CH_(3)CO_(2)H`
`CH_(3)CHO,"CC"l_(3)CHO`
`C_(2)H_(5)Cl,"CC"l_(3)CHO`

Answer :C
Discussion
8389.

The substance added in water in the froth floatation process is

Answer»

Olive oil
PINE oil
Coconut oil
None of the above

Solution :Pine oil is FOAMING agent. Now another substance scollector such as POTASSIUM ethyl exnthate or amyl xanthate orare ADDED.
Discussion
8390.

The tetrahedral crystal field splitting is only ....... of the octahedral splitting.

Answer»

`1//2`
`2//9`
`4//9`
`5//9`

SOLUTION :`Delta_(t)=(4)/(9)Delta_(E)` (t=tetrahedral, 0-octahedral)
Discussion
8391.

Writeshortnotes on (i) Negativecatalyst (ii) Phasetransfer catalyst

Answer»

Solution :(i) Negativecatalyst : In certain reactions , presenceof certainsubstances, decreases , the rate of the reaction. Ethanol is anegative catalystfor the followingreactions.
Eg :
(i) ` 4CHCl_(3) + 3O_(2) to 4COCl_(2)+ 2H_(2)O+ 2Cl_(2)`
Ethanaldecreasesthe rateof the reaction
(ii) ` 2H_(2)O_(2) overset("Glycerine")to 2H_(2)O + O_(2)`
Int he decomposition of hydrogen peroxide,diluteacidor glycerol acts as a negative catalyst
(iii) PhaseTransfercatalysis :Supposethe reactant of a reaction is presentin onesolventand the other reactant is presentin an another solvent. The reaction between them is very slow,if the solventsare immisible . As thesolventsfrom separate phases, the REACTANTS have to migrateacross the boundary to react. But migration of reactants acrossthe boundaryis noteasy.For such SITUATIONS a third solventis added which is miscible with both . So, the phaseboundary is eliminated reactantsfreelymix react fast.but forlargescaleproductionof anyproduct, use of thirdsolvent is not convenient as it MAYBE exprensive.for suchproblems phasetransfer catalyst( a phosetransferreagent) to facilitatetransportof a reactantin onesolventto the othersolventwherethe second reactant is present . As the reactantsare now brought together, theyrapidlyreactand fromthe product.
Examples :
Substitution of ` CI^(-) and CN^(-)` in thefollowingreaction.
` underset(" organic phase")(R-CI) + underset("AQUEOUS phase")(NaCN) to underset( " orgainc phase")`
R-Cl = 1- chloroocatane
R -CN=1 - cyanooctane
Bydirect heatingof two phase mixture of organic1- chlorooctane with aqueoussodium cyanide for several days, 1 -cyanoocatane is not obtained. However,if a small amountof quaternary ammoniumsaltliketetraalkyl ammoniumchloride is added, a rapid transition of 1-cyanoocatane occursin about100% yieldafter1 or 2hours.in this reaction,the tetraalkylammoniumcation, whichhashydrophobic and hydrophilicends, TRANSPORTS CN fromthe aqueous phaseto the organicphasethe aqueousphaseto the orgainc phase usingits hydrophilic ends and facilitates the reaction with 1- chloroocatne as shown below :
`underset( "aqueous phase")NaCH +R_(4)N^(+)CI^(-) tounderset(" It movesto organicphase ")(R_(4) N^(+)CN^(-) + CI^(-)) `
` underset( " Bothin organicphase") ( R_(4)N^(+)CN^(-)+ R-CI) tounderset( " organic phase") ( R- CN)+ underset(" It movesto aqeouesphase,releases Cl- again picksup CN- and transports it")( R_(4) N^(+)CI^(-))`
so phasetransfer catalyst,speeds up thereaction by transportingone reactantfromone phaseto another.
Discussion
8392.

Which of the following will form two isomers with semicarbazide?

Answer»

Benzaldehyde
Acetone
Benzoquinone
Benzophenone

Solution :`C_(6)H_(5)CH=O+H_(2)NNHCONH_(2)RARR`
`C_(6)H_(5)CH=NNHCONH_(2)`
Discussion
8393.

The reagents ammonium chloride and aqueous ammonia will precipitate

Answer»

`BI^(+3)`
`PB^(+2)`
`MG^(2+)`
`FE^(+3)`

Solution :`Bi^(+3), Pb^(+2), Fe^(+3)`
Discussion
8394.

Which of the following is (are) correct:

Answer»

CALOMEL is mercuric chloride
Calomel is widely used as an antispetic
Calomel is used medically as purgative
Calomel is freely soluble in water.

Solution :`Hg_(2) + (NO_3)_2 + 2HCL RARR Hg_2Cl_2 darr+2HNO_3`
`Hg_2 + (NO_3)_2 + 2NaCl rarr Hg_2Cl_2 darr + 2NaNO_3` (white ppt)
It is used asx purgative in medicine and making calomel electrode.
Discussion
8395.

Which are correct reactions'?

Answer»



`CH_3-CH_2-Cl + NH_(3(l)) to CH_3-CH_2-NH_2`
None of these

Solution :(a) and (b) are ELIMINATION reactions while (c) is nucleophilic substitution bimolecular reaction.
Discussion
8396.

When orange solution containing Cr_(2)O_(7)^(2-) ion is treated with an alkali, a yellow solution is formed and when H^(+) ions are added to yellow solution, an orange solution is obtained. Explain why does this happen?

Answer»

Solution :orange COLOUR `Cr_(2)O_(7)^(2-)` ion and yellow colour `CrO_(4)^(2-)` are inter-convertible depending on the PH of MEDIUM.
`underset(("orange colour"))(Cr_(2)O_(7)^(2-)) underset(H^(+))overset(""^(-)OH)HARR underset(("yellow colour"))(CrO_(4)^(2-))`
Discussion
8397.

Which of the follwing is /are sedative?

Answer»

VALIUM
Pebicilln
perhydrol
Dettol

Answer :A
Discussion
8398.

Two amino acids say A, B react to giv

Answer»

two DIPEPTIDES
THREE dipeptides
FOUR dipeptides
only ONE

Solution :only one
Discussion
8399.

Which of the following (having comparable molecular masses) has highest boiling point ?Alcohols,Ethenes,Phenols,Hydrocarbons.

Answer»

Alcohols
Ethens
Phenols
Hydrocarbons

Answer :A
Discussion
8400.

Write the products of oxidation of glucose with : Nitric acid

Answer»

Solution :`underset("Glucose")underset(CH_(2)OH)underset("|")overset("CHO")overset("|")(("CHOH")_(4)) + [O] overset(HNO_(3))to underset("Saccharic acid")underset(COOH)underset("|")overset("COOH")overset("|")(("CHOH")_(4))`
Discussion