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13001.

Toluene can be converted to benzaldehyde by

Answer»

`CrO_(2)Cl_(2)//CS_(2)`
`CrO_(3)//(CH_(3)CO)_(2)O`
side CHAIN halogenation/hydrolysis
All the above.

Answer :D
Discussion
13002.

Write two uses of ammonia.

Answer»

Solution :AMMONIA is used as a refrigerant
It is used in the MANUFACTURE of NITRIC ACID in Ostwald.s process.
Discussion
13003.

underset("Brown")([(NH_(3))_(5)Co-O-O-Co(NH_(3))_(5)]^(4+)) underset("oxidise")overset([S_(2)O_(8)]^(2-))tounderset("Green")([(NH_(3))_(5)Co-O-O-Co(NH_(3))_(5)]^(+5)) The magnetic moment of green complex is 1.7 BM & for brown complexes magnetic moment is zero. (O-O) is same in all respect in both the complexes. The O.S. of Co in brown complex & green complex respectively are-

Answer»

`{:(III ""III"&"IV""III),("BROWN""green"):}`
`{:(III ""II"&"III""III),("brown""green"):}`
`{:(III ""III"&"III""II),("brown""green"):}`
`{:(III ""IV"&"III""III),("brown""green"):}`

Answer :A
Discussion
13004.

Write the overall rendox reaction which takes place in the galvanic cell, Pt(s)abs(Fe^(2+)(aq), Fe^(3+)(aq))abs(MnO_(4)^(-)(aq), H^(+)(aq),Mn^(2+)(aq))Pt(s)

Answer»

Solution :Oxidation at anode
`Fe^(2+) rarr Fe^(3+)+e^(-) "...(1)"`
REDUCTION at cathode
`MnO_(4)^(-)+8H^(+)+5e^(-) rarr Mn^(2+)+4H_(2)O"...(2)"`
To balance multiply equation `(1) TIMES 5` and equation `(2) times 1`
`5Fe^(2+)+MnO_(4)^(-)+8H^(+) rarr Mn^(2+)4H_(2)O+5Fe^(3+)`
Overall REDOX reaction is
`5Fe^(2+)""_((aq))+MnO_(4(aq))^(-)+8H_((aq))^(+) rarr 5Fe^(3+)""_((aq))+Mn^(2+)""_((aq))+4H_(2)O(l)`
Discussion
13005.

What is the major product of the following reaction ? CH_(3)CH_(2)- overset(O)overset("||")C-H+CH_(3)MgBr overset(H_(2)O //H^(+))rarr

Answer»

1-Butanol
Butanal
2-Butanol
Butanone

Answer :C
Discussion
13006.

The volume of (N)/(10)NaOH require to neutralise 100 ml of (N)/(25) HCl is

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30 ml
100 ml
40 ml
25 ml

Solution :For complete neutralisation,
Milli EQUIVALENT of base=milli equivalent of acid
`N_(1)V_(1)=N_(2)V_(2) implies(1)/(10) xxV_(1)=(1)/(25)xx100,V_(1)=40ml`
Discussion
13007.

What is mole fraction ? Explain in brief.

Answer»

Solution :Definition : The ration between mole of one component of solution and TOTAL MOLES of solution is known as mole fraction of component.
Commonly used symbol for mole fraction is x and subscript used on the right hand side of x denotes the component.
Mole fraction of a component `= ("Number of moles of the component")/("Total number of moles of all the components")`
For example, in a binary MIXTURE, if the number of moles of A and B are `n_(A)` and `n_(B)` respectively, the mole fraction of A will be
`x_(A)=(n_(A))/(n_(A)=n_(B))`
For a solution containing .i. number of components,we have :
`x_(i)=(n_(i))/(n_(1)+n_(2))+.....+n_(i)=(n_(i))/(Sigma n_(i))`
It can be shown that in a given solution sum of all the mole fractions is unity, i.e.,
`x_(1)+x_(2)+ ............. +x_(i)=1`
Mole fraction unit is very useful in relating some PHYSICAL properties of solutions, say vapour pressure with the concentration of the solution and quite useful in describing the calculations INVOLVING gas mixtures.
Discussion
13008.

Which of the followingreduction is notthermodynamically feasible ?

Answer»

`Cr_(2)O_(3) + 2AL toAl_(2)O_(3) + 2Cr`
`AI_(2)O_(3) + 2Cr toCr_(2)O_(3) + 2Al`
`3TiO_(2) + 4AI to 2 Al_(2)O_(3) + 3Ti`
None of these

Solution :` AI_(2)O_(3) + 2Cr to Cr_(2)O_(3) + 2AI `
Discussion
13009.

Which of the following is the strongest Lewis acid

Answer»

`BI_(3)`
`B Br_(3)`
`BCl_(3)`
`BF_(3)`

Solution :Larger the SIZE of halogen atom less is the back donation of electrons into empty 2P ORBITAL of B.
Discussion
13010.

When a steady current of 2A was passed through two electrolytic cells A and B containing electrolytes ZnSO_4 and CuSO_4 connected in series, 2g of cu were deposited at the cathode of cell B. How long did the current flow? What mass of Zn was deposited at cathode of cell A?

Answer»

Solution :Suppose the current flowed for t seconds
Total charge =`2A times ts =2t` coulomb
Thus, 2 FARADAY or `2 times 96500` coulombs charge is required to deposit 1 mole of copper
`2 times 96500` coulombs deposit =63.5g of copper
2t coulombs deposit= `63.5/(2 times 96500) times 2t=(63.5t)/96500 G`
Also `(63.5t)/96500 g=2g`
or `t=(2 times 96500)/63.5=3039 seconds`
Mass of Zn deposited
According to Faraday.s second law
`(Mass of zi nc)/(Eq. weight of Zn)=(Mass of copper)/(Eq. weight of copper)`
or `(Mass of zi nc)/(65//2)=2/(63.5//2)`
or Mass of zinc =`(2 times 65)/63.5=2.047g`
Discussion
13011.

What will be the EMF of the following electrode concentration cel at 25^(@)C Hg-Zn(C_(1)M)|Zn^(2+)(CM)|Hg-Zn(C_(2)M) If the concentrations of zinc amalgam are 2 g per 100 g of mercury and 1 g per 100 g of mercury in the aniodic and the cathodic compartments respectively.

Answer»

SOLUTION :The half-cell reaction are
At anode: `Zn(C_(1))TOZN^(2+)(C)+2E^(-)`
`underset("At anode:"Zn^(2+)(C)+2e^(-)toZn(C_(2)))`
net reaction: `Zn(C_(1))toZn(C_(2))`
Thus, it is a CONCENTRATION cell for which
`E_(cell)=(0.0591)/(2)"log"(C_(1))/(C_(2))=(0.0591)/(2)"log"(2)/(1)=(0.0591)/(2)xx0.3010=8.89xx10^(-3)V`
Discussion
13012.

Which would be the product formed when 1-bromo-3-chloro cyclobutane reacts with two equivalents of metallic sodium in ether

Answer»




SOLUTION :
Discussion
13013.

When electriccurrentis passedthroughacidifiedwaterfor 1930s 1120 mL of H_(2)gas is collected(at sTP) at the cathode what is the curent passed in amperes

Answer»

0.05
0.5
5
50

Solution :ELECTROLYSIS of watertakes places as follws
`H_(2)O rarr H^(+) + OH^(-)`
Giventime t = 1930 S
Numberof moles of hydrogen collected
`=(1120xx10^(-3))/(22.4)` MOL = 0.05 mol
`because`1 moleof hydrogenis deposited 2 MOLESOF electron `therefore`0.05 molesof hydrogen willl be deposited
` = 2 xx0.05 = 0.10`moleof electrons
chargeQ= nF = `0.1 xx965000`
Charge Q = it
`0.1 xx96500 =i xx1930`
`i=(0.1 xx96500)/(1930)=5.0 A`
Discussion
13014.

Which one of the following compounds undergoes bromination on its aromatic ring (electrophilic aromatic substitution) at the fastest rate?

Answer»




ANSWER :B
Discussion
13015.

Which mechanism is followed in the synthesis of polystrene?

Answer»

FREE RADICAL POLYMERISATION
cationic polymerisation
Anionic polymerisation
`SN^(1)` mechanism

Solution :free radical polymerisation
Discussion
13016.

Which is not a colloid?

Answer»

CHLOROPHYLL
Egg
Ruby GLASS
Milk

Solution : Chlorophyll
Discussion
13017.

Which is the most abundant carbohydrate in a plant kingdom ?

Answer»

GLYCOGEN
CELLULOSE
Starch
Galactose

SOLUTION :Cellulose
Discussion
13018.

What volume of acetylene at NTP will be produced from 100 g of CaC_2 when reacts with excess of water ?

Answer»


ANSWER :35 L of ACETYLENE
Discussion
13019.

Two beakers 1 and 2 containing 0.15 moles of napthalein (C_(10H_(8)) in 100gm of benzene and 31 gram of glucose in 100gm of benzene respectively , areplaced under a tightly sealed bell-jar at 298K . Calculate the weight fraction of naphthalein at equilibrium by assuming ideal behaviour

Answer»

`0.70`
`0.085`
`0.35`
`0.17`

ANSWER :D
Discussion
13020.

Y overset(Delta, 205^@ C) larr Ca SO_4. 2H_2 O overset(Delta, 120^@ C) larr X. X and Y are respectively -

Answer»

PLASTER of PARIS, DEAD BURNT plaster
dead burnt plaster, plaster of paris
CaO and plaster of pairs
plaster of paris, MIXTURE of gases

Answer :A
Discussion
13021.

Thestrutures of carbocation and carbanion are respectively-

Answer»

LINEAR and PLANAR
TRIGONAL planar and trigonal pyrmidal
tetrahedral and trigonal planar
trigonal PYRAMIDAL and tetrahedral

Answer :B
Discussion
13022.

Which is most reactive towards electrophilic reagent?

Answer»




ANSWER :A
Discussion
13023.

Which among the following can act as reducing agent (A)SnCl_(2), (B)CO and (C)PbCl_(2)?

Answer»

(A) and (B)
`(B) and (C)
(C) and (A)
Only (B)

Solution :Lead in +2 oxidation is stable while SN and C are both stable in +4 oxidation.
Discussion
13024.

Which one of the following ligand is capable of forming a low spin as well as a high spin complex ?

Answer»

CO
`F^(-)`
`NH_(3)`
`CN^(-)`

SOLUTION :CO and `CN^(-)` are strong LIGANDS and `F^(-)` is a WEAK LIGAND whereas `NH_(3)` is neither very weak nor very strong ligand.
Discussion
13025.

Which of the following has the highest pK_(b) value?

Answer»




ANSWER :A
Discussion
13026.

Using the standard electrode potentials, predict if the reaction between the following is feasible : (a) Fe^(3+) (aq) and I^(-)(aq), (b) Ag^(+) (aq) and Cu(s) (iii) Fe^(3+) (aq) and Br^(-) (aq), (d) Ag (s) and Fe^(3+) (aq) ( c) Br_(2)(aq) and Fe^(2+) (aq). Given standard electrode potentials: E_(1//2, I_(2))^(@) =0.541 V, E_(Cu^(2+),Cu)^(@) = 0.34 V E_(1//2,Br_(2),Br^(-))^(@) = 1.09 V, E_(Ag^(+)//Ag)^(@)= 0.80 V E_(Fe^(3+),Fe^(2+))^(@) = 0.77 V

Answer»

SOLUTION :A REACTION FEASIBLE if emf of the cell constituted is +ve
(a) `Fe^(3+)(aq) + I^(-)(aq) to Fe^(2+)(aq) +1/2 I_(2), i.E, Pt | It | I^(-) (aq) || Fe^(3+) (aq) | Fe^(2+) (aq) | Pt`
`therefore E_("cell")^(@) = (E_(Fe)^(3+), Fe^(2+)) - (E_(1//2I_(2),I^(-))^(@)) = 0.77 - 0.54 = 0.23 V` (feasible)
(b) `Ag^(+)(aq) + Cu to Ag(s) + Cu^(2+)(aq)`, i.e. `Cu | Cu^(2+)(aq) || Ag^(+) (aq) | Ag`
`E_("cell")^(@) = 0.77 - 1.09 = -0.32 V` (not feasible)
(d) `Ag(s) + Fe^(3+) (aq) to Ag^(+) + Fe^(2+)` (aq)
`E_("cell")^(@) = 0.77 - 0.80 =-0.03 V` (not feasible)
( e) `1/2Br_(2)(aq) + Fe^(2+) (aq) to Br^(-) + Fe^(3+)`,
`E_("cell")^(@) = 1.09 - 0.77 = 0.32 V` (feasible)
Discussion
13027.

When a catalyst increases the rate of a chemical reaction, the rate constant:

Answer»

Increases
Decreases
Remains constant
Becomes infinite

Answer :A
Discussion
13028.

To measure the quantity of MnCl_(2) dissolved in an aqueous solution, it was completely converted to KMnO_(4) using the reaction, MnCl_(2)+K_(2)S_(2)O_(8)+H_(2)Orarr KMnO_(4)+underset("(equation not balanced)")(H_(2)SO_(4)+HCl) Few drops of concetrated HCl were added to this solution and gently warmed. Further, oxalix acid (225 g) was added in portions till the colour of the permanganate on disappeared. The quantity of MnCl_(2) (in mg) present in the intial solution is _____ (Atomic weights in "g mol"^(-1):Mn=55, Cl=35.5)

Answer»


Solution :`(126)underset("a MOLE")(MnCl_(2))+K_(2)S_(2)O_(8)+H_(2)Orarrunderset("a mole")(KMnO_(4))+H_(2)SO_(4)+HCl`
`C_(2)O_(4)^(-)+MnO_(4)^(-)OVERSET(H^(+))rarrCO_(2)`
`m_(eq)" of "C_(2)O_(4)^(-)=m_(eq)" of "MnO_(4)^(-)`
`2xx0.225//90=axx5`
`a=1xx[55+71]`
`=126mg`
Discussion
13029.

Total number of configurational isomers of tartaric acid is

Answer»

2
3
4
5

Solution :.
Discussion
13030.

Which one amongthe following pairs of ions cannot be separated by H_2S in diluteHCl ?

Answer»

`Al^(3+), Cu^(2+)`
`Zn^(2+), Cu^(2+) `
`Ni^(2+), PB^(2+) `
`Sn^(4+),Bi^(3+)`

Solution :Both BELONG to GROUP II .
Discussion
13031.

The work required to raise a mass of 0.5 kg through a height of 1 m is

Answer»

4.9 J
49 J
490 J
4900 J

Answer :A
Discussion
13032.

Which one of the following solution has highest equivalent conductance?

Answer»

0.1 M NaCl
0.05 M NaCl
0.005 M NaCl
0.25 M NaCl

Answer :C
Discussion
13033.

Which of the following will be most stable diazonium salt RN_2^(+)X^(-)?

Answer»

`CH_(3)CH_(2)N_(2)^(+)X^(-)`
`C_(6)H_(5)N_(2)^(+)X^(-)`
`C_(6)H_(5)CH_(2)N_(2)^(+)X^(-)`
`CH_(3)N_(2)^(+)X^(-)`

Answer :B
Discussion
13034.

Which of the following represents the correct state of existence of sulphanilic acid ?

Answer»




NONE of these

Solution :Sulphanilic acid EXISTS as ZWITTER ion or BIPOLAR ion or Doubly charged ion.
Discussion
13035.

The standard reduction potential of the electrode Cl^(-) L CuCl is E^@ = 0.137volt. Calculate K_(sp)of CuCl at 298 K. (E_(Cu^(+), cu)^@ = 0.521 "volt") .

Answer»

SOLUTION :`3.19 xx 10^(-7) ("mol"//L)^2`
Discussion
13036.

Which of the following statementsis not correct ?

Answer»

Some antisepticscan be added to SOAPS .
Dilute SOLUTIONS of some disinfectants can be USED as ANTISEPTIC .
Disinfectants are ANTIMICROBIAL drugs .
Antiseptic medicinescan be ingested .

Solution :Antiseptic medicines cannot be ingested .
Discussion
13037.

Whatis the structural featurecharacterising reducing sugar ?

Answer»

SOLUTION :Carbohyrates which can reduce Tollen.s reagentsor Fehlingsolution are classified as reducingsugar . STRUCTURAL featureis that the redcuingsugars CONTAINS a FREE aldehydic or ketonicgroup .
Discussion
13038.

What is the use of Salol ?

Answer»

ANTISEPTIC
ANALGESIC
ANTIPYRETIC
NONE of these

ANSWER :A
Discussion
13039.

Why boiling point of water is increased on addition of sodium chloride into it ?

Answer»

SOLUTION :When NaCl (or any other non-volatile solute) is dissolved in water, vapour pressure of water DECREASES (because some of the solvent molecules on the SURFACE and replaced by the molecules of the solute which are non-volatile). The solution has to be heated more to make vapour pressure equal to the external pressure. Hence, BOILING point is increased.
Discussion
13040.

Write the reactions of alcohols with hydrogen halides

Answer»

Solution :`to` With hydrogen halides, the alcohols react to form alkyl halides. The difference in the reactivities of three classes of alcohols with HCl distinguishes from ONE another.
`to` The alcohol reacts with Lucas REAGENT (conc. HCI and `ZnCl_(2)`) while their halides are immiscible and produce turbidity in solution. In case of tertiary alcohols, the turbidity is produced immediately as they form halides easily. Primary alcohols do not produce turbidity at room temperature.
`to` The reaction of tertiary alcohols take PLACE by `S_(N)l` mechanism whereas primary and secondary alcohols reacts by `S_(N)2` mechanism.
`(CH_(3))_(3)C-OH overset(ZnCl_(2)//HCl) to (CH_(3))_(3)C- Cl+ H_(2)O`
Discussion
13041.

Which of the following is insoluble in dil. HNO_2 but soluble in aqua regia?

Answer»

HGS
PbS
`Bi_(2)S_(3)`
CuS

Solution :HgS is INSOLUBLE in dil. `HNO_(3)` but soluble in aqua REGIA.
`3HgS +2HNO_(3) + 6HClto 3HgCl_(2)+2NO+4H_(2)O+5S`
Discussion
13042.

The structure of iron pentacarbonyl is:

Answer»

SQUARE PLANAR
TRIGONAL bipyramidal
Triangular
None

Answer :B
Discussion
13043.

Which complex is obtained on reaction of Ag with NaCN ?

Answer»

`[AG(CN)_(2)]^(2-)`
`[Ag(CN)_(2)]^(-)`
`[Ag(CN)]^(-)`
`[Ag(CN)_(3)]^(-)`

ANSWER :B
Discussion
13044.

The root mean square speed of gas molecules

Answer»

INCREASES with molar MASS
decreases with temperature
increases with temperature
increases with temperature as WELL as molar mass

Answer :C
Discussion
13045.

Which of the following pair of protein is globular protein ? P-kertain, Q-Insulin, R-myosin, S-albumin

Answer»

<P>P, R
Q, R
R, S
Q, S

Answer :D
Discussion
13046.

Which interhalogen compound is identified by spectroscopic method ?

Answer»

ICL
IF
CIF
BrCl

Answer :B
Discussion
13047.

Which element in the first transition series shows the maximum number of oxidation states ?

Answer»

SOLUTION :MANGANESE
Discussion
13048.

What is the unit for rate constant for pseudo first order reaction ?

Answer»

L `MOL^(-1)sec^(-1)`
`sec^(-1)`
mol `"LT"^(-1)sec^(-1)`
`L^(2)mol^(-2)sec^(-1)`

Answer :A
Discussion
13049.

What happen when: (a) Green Vitriol is strongly heated. , (b) FeSO_(4) reacts with potassium ferricyanide. (c ) Fe_(2)O_(3) is fused with soda ash. , (d) Salts of iron (III) reacts with NH_(4)SCN. (e ) Zinc oxide and cobalt oxide is fused. ,(f) Malachite is made to react with dilute H_(2)SO_(4) (g) copper sulphate is exposed to air for longer period Lunar caustic is made to react with sodium hydroxide and then product is dried. (i) Silver nitrate reacts with excess iodine. Potassium dichromate reacts with cold and concentrated H_(2)SO_(4)

Answer»


SOLUTION :N//A
Discussion
13050.

Which has the highest f.p. at 1 atm ?

Answer»

`0.1` M NaCl solution
`0.1 M BaCl_(2)` solution
`0.1M` SUGAR solution
`0.1 M FeCl_(3)` solution

Answer :C
Discussion