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1201.

What happens when a ketone is reduced ?

Answer»

SOLUTION :`2^@` ALCOHOL is OBTAINED
Discussion
1202.

Which of the following amino acid is basic in nature?

Answer»

Valine
Tyrosine
ARGININE
Leucine

SOLUTION :Arginine AMINO acid is basic in NATURE (Basic due to the presenceof 'NH' groups)
Discussion
1203.

Which of the following pair of metals is purified by Van Arkel method ?

Answer»

GA and In
Zr and Ti
Ag and Au
Ni and Fe

Answer :B
Discussion
1204.

Which of the following options will be correct for the stage of half completion of the reaction A hArr B ?

Answer»

`Delta G^(@)=0`
`Delta G^(@)GT 0`
`Delta G^(@)LT 0`
`Delta G^(@)=-` RT ln 2

Solution :`Delta G^(@)=-2.303` RT log K
At STAGE of half completion of reaction `[A]=[B]`.Therefore, K = 1 and `Delta G^(@)=0`.
Discussion
1205.

What is the value of n in the following equation : Cr(OH)_(4)^(-)+OH^(-) rarr CrO_(4)^(2-)+H_(2)O+n e?

Answer»

3
6
5
2

Answer :A
Discussion
1206.

When one mole of an organic compound X is reacted with an excess of PCl_(5) then two moles of hydrogen chloride are formed. Which of the following compounds could be X?

Answer»

`UNDERSET(OH)underset(|)CH_(2)-underset(OH)underset(|)CH_(2)`
`C_(6)H_(5)CH=O`
`underset(OH)underset(|)CH_(2)-COOH`

Solution :`underset(CH_(2)-OH)OVERSET(CH_(2)-OH)(|) overset(PCl_(5))to underset(CH_(2)-Cl)overset(CH_(2)-Cl)(|)+2HCl`
`underset(OH)overset(CH_(2)-COOH)(|) overset(PCl_(5))to underset(Cl)overset(CH_(2)-COCl)(|)+2HCl`
Discussion
1207.

Which of the following reduction are actually employed in commercial extraction of metals?

Answer»

`Fe_(2)O_(3) + 2Al to Al_(2)O_(3) + 2Fe`
`Cr_(2)O_(3) + 2Al to Al_(2)O_(3) + 2Cr`
`2Na[Au(CN)_(2)] + Znto Na_(2)[ZN(CN)_(4)]+ 2Au`
`Cu_(2)S + Pb to Cu + PbS DARR`

Answer :B::C
Discussion
1208.

When a metal is to be extracted from its ore and the gangue associated with the ore is silica, then

Answer»

an ACIDIC flux is needed
a BASIC flux is needed
both acidic and basic fluxes are needed
Neither of them is needed

Solution :Since silica is acidic impurity the flux must be basic.
`CaO+SiO_(2) to CaSiO_(3)`
Discussion
1209.

What happens when R.B.Cs are placed in 0.1% NaCI solution ?

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SOLUTION :Their SIZE INCRESES.
Discussion
1210.

What is the mass of the precipitate formed when 50 mL of 17.0% solution of AgNO_(3) is mixed with 50 mL of 11.6%NaCl solution?

Answer»

Solution :`" 100 ML of AgNO"_(3)" solution contain AgNO"_(3)=17.0 g`
`THEREFORE"50 mL of AgNO"_(3)" solution will contain AgNO"_(3)=(17.0)/(100)xx50=8.5g`
`"Molar mass of AgNO"_(3)=108+14+3xx16=170" g mol"^(-1)`
`therefore"Moles of AgNO"_(3)" present"=(8.5)/(170)="0.05 mol"`
`"100 mL of NACL solution contain NaCl = 11.6 g"`
`therefore"50 mL of NaCl solution will contain NaCl"=(11.6)/(100)xx50=5.8g`
`"Molar mass of NaCl"=23+35.5=58.5" g mol"^(-1)`
`therefore"Moles of NaCl present "=(58)/(8.5)=" 0.1 mole"`
The reaction taking place will be
`{:(,AgNO_(3),+,NaClrarrAgCl+NaNO_(3)),("Amounts taken","0.05 mole",,"0.1 mole"):}`
Thus, `AgNO_(3)` will be the limiting reagent.
`"AgCl formed = 0.05 mole "=0.05xx143.5g=7.175g`
Discussion
1211.

Write IUPAC names of the following: (i) K_3 [Fe(C_2 O_4)_3] (ii) [Pt(NH_3)_6] Cl_4

Answer»

SOLUTION :(i) Potassium trioxalato FERRATE (III)
(ii) Hexammine PLATINUM (IV) chloride.
Discussion
1212.

Write the reactions of the final alkylation product of aniline with excess of methyl iodide in the presence of sodium carbonate solution.

Answer»

Solution :The reaction takes place in the following steps :

`overset(+)(2[C_(6)H_(5)NH_(2)CH_(3)])I^(-)+Na_(2)CO_(3) rarr underset("N-Methylaminline")(2C_(6)H_(5)NHCH_(3))+CO_(2)+2NaI`
`""C_(6)H_(5)NHCH_(3) underset(Na_(2)CO_(3))overset(CH_(3)I)(rarr)underset("N, N-Dimethylaniline")(C_(6)H_(5)N(CH_(3))_(2))`

`overset(+)(2C_(6)H_(5)N(CH_(3))_(3))I^(-)+Na_(2)CO_(3) rarr underset("N,N,N,-Trimethylanilinium CARBONATE")(overset(+)([C_(6)H_(5)N(CH_(3))_(3)])_(2)CO_(3)^(2-)+2NaI)`
Discussion
1213.

When HCl gas is passed through saturated solution of BaCl_2 a white ppt. is obtained.This is due to:

Answer»

IMPURITIES in `BaCl_2`
Impurities in HCl
Precipitation of `BaCl_2`
FORMATION of complex

Answer :B
Discussion
1214.

Which of the reaction can be employed for the preparation of unsymmetrical ether?

Answer»

DEHYDRATION of alcohols
Williamson's SYNTHESIS
Dehydration of CARBOXYLIC acid
Dehydrogenation of alcohols

Answer :B
Discussion
1215.

Which of the following is/are not example of thermite reaction ?

Answer»

`3Mn_3 O_4 + 8Al to 4Al_2 O_3 + 9Mn`
`Cr_2 O_3 + 2AL to Al_2 O_3 + 2Cr`
`2Cu_2 O + Cu_2 S to 6Cu + SO_2`
`2HgO + HGS to 3Hg + SO_2`

ANSWER :C::D
Discussion
1216.

The rate constant of a reaction has the units as that of rate of reaction . The reaction order is

Answer»

0
1
2
3

Answer :A
Discussion
1217.

Vapour phase nitration of alkane gives

Answer»

NITROALKANE
dinitroalkane
trinitroalkane
tetraintrioalkne

ANSWER :A
Discussion
1218.

Uracil base is present in

Answer»

DNA
RNA
`BETA`-D-ribose
`beta`-D-deoxyribose

Answer :B
Discussion
1219.

When 48250 C of electricity is passed through an aqueous solution of NiI_(2) (at.mass of Ni = 58.8) , the weight of nickel metal deposited be

Answer»

7.3 gm
14.7 gm
22.0 gm
29.4 gm

Solution :96500 C will deposit 1 gm equivalent i.e. `(58.8)/(2) [("At. Mass")/("valency")]` G of Nickel
`therefore` 48250 C will DEPOSITS `= (48250)/(96500) xx (58.8)/(2) = 14.7` g
Discussion
1220.

What volume of 36 N and 1N sulphuric acid must be mixed to get 1L of 6N sulphuric acid

Answer»

96.7 ML of 36 N + 903.3 ml of 1N
142.8 ml of 36 N + 857.2 ml of 1N
903.3 ml of 36 N + 96.7 ml of 1N
100 ml of 36 N + 900 ml of 1N

Solution :LET volume of 36 N `H_(2)SO_(4)=x` litre and volume of `1 N H_(2)SO_(4)=(1-x)` litre.
Both these acids on mixing should give 6 equivalents of `H_(2)SO_(4)`
`:.36x+(1-x)=6` or `35x=5`
or `x=(5)/(35)=1/7 L=(1000 ml)/(7)=142.8`ml
`:.` 142.8 ml of 36N `H_(2)SO_(4)` and857.2 ml of 1N `H_(2)SO_(4)` should be mixed.
Discussion
1221.

Which is most explosive?

Answer»

`PCl_(3)`
`NH_(3)`
`AsH_(3)`
`SbH_(3)`.

Answer :B
Discussion
1222.

The surface of copper gets tarnished by the formation of copper oxide. N_(2) gas was passed to prevent the oxide formation during heating of copper at 1250 K. However, the N_(2) gas contains 1 mole % of water vapour as impurity. The water vapour oxidises copper as per the reaction given below 2Cu(s)+H_(2)O(g)rarrCu_(2)O(s)+H_(2)(g)P_(H_(2)) is the minimum partial pressure of H_(2) (in bar) needed to prevent the oxidation at 1250 K. The value of ln(P_(H_(2))) is_____ (Given : total pressure = 1 bar, R (universal gas constant)= 8 JK^(-1) mol^(-1), ln(10) = 2.3, Cu(s) and Cu_(2)O(s) are mutually immiscible.At 1250K :2Cu(s)+1//2O_(2)(g)rarrCu_(2)O(s),DeltaG^(theta)=-78,000J mol^(-1)H_(2)(g)+1//2O_(2)(g)rarrH_(2)O(g),DeltaG^(theta)=-1,78,000 J mol^(-1), G the Gibbs energy

Answer»


Solution :`2Cu(s)+(1)/(4)O_(2)(g)rarr1Cu_(2)O(s)""DeltaG^(@)=-78 kJ`
`[H_(2)(g)+(1)/(2)O_(2)rarrH_(2)O(g)""DeltaG^(@)=-178 kJ]XX(-1)`
Hence,`2Cu(s)+H_(2)O(g)rarrCu_(2)O+H_(2)(g)DeltaG^(@)=+100 kJ`
`DeltaG=DeltaG^(@)+RT LN Q`
`0=+100+(8)/(1000)xx1250ln.(P_(H_(2)))/(P_(H_(2)O))`
`-(100xx1000)/(8)=1250ln.P_(H_(2))/(((1)/(100)xx1))`
`ln P_(H_(2))=-14.6`
Discussion
1223.

Which of the following is not a unidentate ligand ?

Answer»

`NH_(3)`
`H_(2)O`
`Cl^(-)`
`NH_(2CH_(2)CH_(2)NH_(2)`

ANSWER :D
Discussion
1224.

Which one of the following will most readily be dehydrated in acidic conditions ?

Answer»




ANSWER :A
Discussion
1225.

Which of the following does not decolourise iodine ?

Answer»

`Na_(2)SO_()`
`Na_(2)S_(2)O_(3)`
`NaCl`
`NAOH`

SOLUTION :NaCl does not decolourise IODINE
Discussion
1226.

The solution of (B) on reaction with zinc gives a precipitate of metal (D).

Answer»

Solution :`(A) -Ag_(2)S` (B) `-NaAg(CN)_(2)`
(C) `-Na_(2)SO_(4)` (D) `Ag`
(E) `AgCl` (F) `-Ag(NH_(3))_(2)Cl`
`2NaAg(CN)_(2)+Zn rarr Na_(2)Zn(CN)_(4)+underset((D))(2Ag)`
Discussion
1227.

The two electron have the following set of quantum numbers : P = 3,2,-2, + 1/2 Q = 3,0,0, + 1/2 Which of the following statement is true ?

Answer»

<P>P has greater energythan Q
P and Q represent same electron
P and Q have same energy
P has lesser energy than Q

Solution :From the GIVEN quantum numbers , it can be inferred that :
P electron BELONGS to 3d orbital.
Q electron belongs to 3s orbital .
Hence , P has greater energy than Q .
Discussion
1228.

When excess of KI is added to copper sulphate solution is formed;

Answer»

CUPROUS IODIDE is FORMED
`I_2` is liberated
Potassium SULPHATE is formed
All

Answer :D
Discussion
1229.

Value of standard electrode potential for the oxidation of Cl^(-) ions is more positive than that of water, even then in the electrolysis of aqueous sodium chloride, why is Cl^(-) oxidised at anode instead of water ?

Answer»

Solution :* Usually, the electrode with less potential undergoes OXIDATION REACTION.
(i) `Cl_((aq))^(-)to (1)/(2) Cl_(2(g))+e^(-),E_(cell)^(Theta)=1.36V`
(ii) `2H_(2)O_((l)) to O_(2(g))+4H_((aq))^(+)+4e^(-),E_(cell)^(Theta)=1.23V`
* According to above reaction, water has low `E_(cell)^(Theta)` value, should be get oxidized but oxidation of `Cl^(-)` is observed.
* Due to over potential of OXYGEN reaction (i) is possible ut reaction (ii) is not possible. for oxidation of water over potential is REQUIRED, water has low potential so it will not give oxidation reaction but `Cl^(-)` give oxidation and get converted into `Cl_(2)`.
Discussion
1230.

Two vitamins absorbed from intestine along wit fats are

Answer»

A and D
A and C
A and B
D and C

Answer :A
Discussion
1231.

Write IUPAC name for [Pt(NH_(3))_(2)Cl_(4)]^(2-).

Answer»

SOLUTION :Diamminctetrachloridoplatinum(II) ION.
Discussion
1232.

The shape of CH_3^(+) and CH_3^(-) is respectively

Answer»

plner,planer
plner,pyramidal
pyramidal,pyramidal
pyramidal,planer

Answer :B
Discussion
1233.

The second ionisation energy is maximum for :

Answer»

Boron
Beryllium
Magnesium
Aluminium

Answer :A
Discussion
1234.

The E_(M^(3+)|M^(2+))^(0) values for Cr, Mn, Fe and Co are -0.41, +1.57V, + 0.77 and +1.97V respectively. Forwhich one of these metals the change in oxidation sate from +2 to +3 is easiest?

Answer»

Co
Mn
Fe
Cr
Discussion
1235.

Which of the following statement is true for proteins?

Answer»

They ACT as antibodies
They act as hormones
They CATALYZE the BIOCHEMICAL reaction
all of these

Answer :D
Discussion
1236.

Which of the following is lyophobic colloidol solution?

Answer»

JELLIES 
GELATIN 
Curd 
Milk 

SOLUTION :Jellies are LYOPHOBIC
Discussion
1237.

Which of the following statement (s) is (are) correct?

Answer»

The electronic configuration of Cr is `[Ar] 3d^(5), 4s^(1)` (Atomic No. of Cr=24)
The magnetic QUANTUM NUMBER may have a NEGATIVE value
In silver atom 23 electrons have spin of one type and 24 of the opposite type (Atomic No. of Ag=47)
The oxidation state of nitrogen in `HN_(3)` is -3

Solution :Only D is wrong because oxidation state of N in `HN_(3)` is -1/3.
Hence A,b and C are the correct ASWER.
Discussion
1238.

When meta-disubstituted benzene A(C_(6)H_(4)X_(2)) is further converted into B(C_(6)H_(4)X_(3)) number of isomers of B formed is ......

Answer»


ANSWER :3
Discussion
1239.

Which compound led to the discovery of compounds of noble gases ?

Answer»

SOLUTION :The formation of `O_(2)^(+)[PtF_(6)]^(-)` during the REACTION of `PtF_(6)` on `O_(2)` LED to the DISCOVERY of COMPOUNDS of noble gases.
Discussion
1240.

Which of the following compounds is most basic

Answer»




SOLUTION : compound is most BASIC DUE to localized LONE pair of electron on nitrogen atom while other COMPOUNDS have delocalized lone pair of electron.
Discussion
1241.

What is the basis of classification of cations into different group ?

Answer»

Solution :The DIFFERENT cations are classified under six groups depending upon the DIFFERENCE in the SOLUBILITIES of their chlorides, sulphide HYDROXIDES and carbonates at different pH values.
Discussion
1242.

What happens when a colloidal sol of Fe(OH)_(3) is mixed with that of As_(2)S_(3) ?

Answer»

Solution :`FE(OH0_(3)` sol being positively charged WHEREAS `As_(2)S_(3)` being NEGATIVELY charged, their charges are NEUTRALIZED on mixing. Hence, their mutual precipitation (coagulation) occurs.
Discussion
1243.

Which of the following gas has least solubility in water ?

Answer»

He
NE
Ar
Xe

Answer :D
Discussion
1244.

Which one of the following does not influence the rate of reaction?

Answer»

Pressure
Concentration of reactant
Temperature
Molecularity

Answer :D
Discussion
1245.

Which of the following is an example of associated colloid ?

Answer»

SOAP in water
protein in water
rubber in BENZENE
`AgNO_(3)` in water

ANSWER :A
Discussion
1246.

Using anhydrous AlCl_3 as catalyst, which one of the following reaction produces ethylbenzene (PhEt)

Answer»

`H_2C=CH_2+C_6H_6`
`H_3C-CH_3+C_6H_6`
`H_3C-CH_2OH+C_6H_6`
`CH_3-CH=CH_2+C_6H_6`

SOLUTION :`C_6H_6+H_2C=CH_2underset(95^@"PRESSURE")OVERSET(AlCl_3, HI)to C_6H_5CH_2CH_3`
Discussion
1247.

Which of the following order of H-bond strength is not correct :-

Answer»

`HF GT H_(2)O gt NH_(3) gt H_(2)S`
`D_(2)O gt H_(2)O`
`H_(2)O gt H_(2)O_(2)`
`HF_(2)^(-) lt (HF)_(2)`

Solution :H-bond STRENGTH `prop` E.N. of ATM
`underset("symmetrical H-bond") ("In HF ---HF" underset(DARR)lt F^(-)"---H"-F to)` H-bond strength
Discussion
1248.

What is the value of (2.303RT)/(F) at 298K temperature ?

Answer»

`0.0296`
`0.59`
`0.0831`
`0.059`

SOLUTION :For, `(2.303RT)/(F)|" Where, "R=8.314, " "T=298K and F=96500C`
`THEREFORE (2.303xx8.314xx298)/(96500)=0.059`
Discussion
1249.

Which one is correct statements

Answer»

Basicity of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 3 RESPECTIVELY
ACIDITY of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 3 respectively
Acidity of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 2 respectively
Basicity of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 2 respectively

Answer :D
Discussion
1250.

Which of the following is not used as a food prevative ?

Answer»

SODIUM salt of benzoic acid
Sodium salt of sorbic acid
Sodium salt of PROPANOIC acid
Sodium salt of PALMITIC acid

Solution :Sodium benzoate is the most important food preservative. Sodiumsalts of few more acids WHICHCAN be used as presevativesare sorbic acid and propanoic acid .
Discussion