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19501.

When primary amine reacts with chloroform in ethanolic KOH, then the product is

Answer»

an ISOCYANIDE
an aldehyde
a cyanide
an alcohol

Solution :An isocyanide.
Discussion
19502.

Which of the following pairs has the same size ?

Answer»

`Zr^(4+), HF^(4+)`
`ZN^(2+), Hf^(4+)`
`FE^(2+), NI^(2+)`
`Zr^(4+), Ti^(4+)`

Solution :`Zr^(4+) and Hf^(4+)` have similar ionic radii due to lanthaniod contraction.
Discussion
19503.

Which of the following oxidation state si common for all lanthanoids?

Answer»

`+2`
`+3`
`+4`
`+5`

ANSWER :b
Discussion
19504.

Which one of the following characteristics are associated with adsorption?

Answer»

`DeltaG and DeltaH` are negative but `DeltaS` is POSITIVE
`DeltaG and DeltaS` are negative but `DeltaH` is positive
`DeltaG` is negative but `DeltaH and DeltaS` are positive
`DeltaG, DeltaH and DeltaS` all are negative

Solution :Adsorption leads to decreases in randomness ( entropy ) i.e., `DeltaS LT 0` for the adsorption to occur , `DeltaG` should be `-ve `.We know that `DeltaG=DeltaH-TDeltaS` if ` DeltaS` is -ve , `T DeltaS`is +ve .It MEANS that `DeltaG` will becomenegativeonly when `DeltaH` is -ve and `DeltaH gt TDeltaS`
Discussion
19505.

Which of the following amino acids contains a thiol group in the side chain

Answer»

METHIONINE
cysteine
valine
serine

Answer :B
Discussion
19506.

Which of the following is a polymer containing nitrogen

Answer»

TERYLENE 
POLYTHENE 
PVC 
NYLON 

ANSWER :D
Discussion
19507.

Which of the followingether is formed from alcohol and diazomethane ?

Answer»

ETHOXYPROPANE
2-methoxypropane
2-Ethoxypropane
2-Ethoxy-2-methylbutane

ANSWER :B
Discussion
19508.

Zn|Zn^(2+)(a=0.1 M)||Fe^(2+)(a=0.01M)|Fe the emf of the above cell is 0.2905 V Equilibrium constant for thecellreactionis

Answer»

`10^(0.32//0.591)`
`10^(0.32//0.0295)`
`10^(0.26//0.295)`
`10^(0.32//0.295)`

Solution :Forcell `Zn|Zn^(2+)(a=0.1 M)||Fe^(2+) (a=0.01 M)|Fe`
The halfcell reactionare
`I Zn(s) rarr Zn^(2+) (aq)+2e^(-)`
`ii Fe^(2+) (Aq)+2e^(-) rarr Fe(s)`
`Zn(s) +Fe^(2+) (Aq) rarr Zn^(2+)(aq)+Fe(s)`
on applyingNernstequation
`E_(cell) =E_(cell)^(@) =0.2905 +0.295 =0.32 V`
At equilibrium `E_(cell)=0`
`E_(cell)^(@) =(0.0591) /(N ) log_(10) k_(c )`
`0.32 =(0.591)//(2) log_(10)k_(c )` or `k_(c )=10^(0.32//0.295)`
Discussion
19509.

What is known as activation energy? How is activation energy affected by (i) the use of a catalyst ? (ii) a rise in temperature ?

Answer»

Solution :Activation energy is the extra energy that must be SUPPLIED to the reactants so that they can change into products.
(i) Activation energy is LOWERED by the use of a catalyst. This is because the catalyst reacts with the reactants to from an intermediate complex which changes into the product. The FORMATION of intermediate complex involves lower activation energy as it is formed EASILY.
(ii) There is no EFFECT of activation energy with the increase of temperature.
Discussion
19510.

Which solution is used as electrolyte in the extraction of aluminium metal ?

Answer»

`Al_(2)O_(3).H_(2)O`
`Al_(2)O_(3) " and " Na_(3)AlF_(6)` (molten SOLUTION)
`Al_(2)O_(3)`
NONE of these

Solution :Molten solution of `Al_(2)O_(3) " and " Na_(3)AlF_(6)` is used as ELECTROLYTE because `Al_(2)O_(3)` as such is a poor CONDUCTOR of electricity.
Discussion
19511.

Which kind of bond is formed between acetone and chloroform ?

Answer»

SOLUTION :HYDROGEN
Discussion
19512.

Which of the following pairs has the same ionic are:

Answer»

`Fe^(2+),Ni^(2+)`
`Zr^(4+),Ti^(4+)`
`Zr^(4+),Hf^(4+)`
`Zn^(2+),Hf^(4+)`

SOLUTION :`Hi^(4+) and Zr^(4+)` are present in group 4 (d-block). DUE to LANTHANOID contraction, these have same sizes.
Discussion
19513.

When 0.04 faraday of electrcity is passed through a solution of CaSO_4. Then the weight of Ca^(2+) metal deposited at the cathode is

Answer»

0.2 gm
0.4 gm
0.6 gm
0.8 gm

SOLUTION :`CA^(++)+2e^(-)toCa`
`E_(Ca)=(40)/(2)=20`
`W_(Ca)=E_(Ca)XX`No.of faradays=`20xx0.04=0.8gm`
Discussion
19514.

When glucose reacts with bromine water , the major product is :

Answer»

GLUCONIC ACID
Saccharin acid
Sorbitol
GALACTOSE

ANSWER :A
Discussion
19515.

Which acts as negative catalyst:

Answer»

LEAD tetraethyl as antiknock compound
Glycerol in DECOMPOSITION of `H_2O_2`
ETHANOL in oxidation of CHLOROFORM
All

Answer :D
Discussion
19516.

Which kind of voids are surrounded by six spheres ?

Answer»

SOLUTION :OCTAHEDRAL
Discussion
19517.

X-ray diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of 3.608 xx 10^(-8) cm. In a separate experiment, copper is determined to have a density of 8.92 g//cm^3 calculate the atomic mass of copper.

Answer»


Solution :Z=4 for FCC structure, `a=3.608 xx 10^(-8)` cm, d=8.92 g `cm^(-3)`, `N_A=6.023 xx 10^(23)`, M = ?
`M = (N_A xx d xx a^3)/(Z) =( 6.023 xx 10^(23) xx 8.92 xx (3.608)^3 xx 10^(-24))/(4)= 63.08 g mol^(-1)` or M = 63.1 u
Discussion
19518.

What is the end product which is obtained on the nitration of toluene

Answer»

o-nitrotoluene
p-nitrotoluene
2,4-dinitrotoluene
2,4,6-trinitrotoluene

Solution :
Discussion
19519.

What is the difference between multimolecular and marcromolecular colloids ? Give one example of each. How are associated colloids different from these two types of colloids ?

Answer»

Solution :Multimolecular and Macromolecular colloids ? GIVE one example of each. How are associated colloids different from these TWO types of colloids?
Multimilecular and Macromolecular colloids.
DIFFERENCE between associated colloids and macromolecular colloids. Multimolecular colloids are due to large size of the MOLECULES themselves (e.g., starch) so large that their size lies in the colloidal range. However, associated colloids are formed by electrolytes so that they dissociate into ions and these ions associated together to from ionic micelles whose size lies in the colloidal range, e,g., soaps. This happens above a particular concentration (called critical micellisation concentration) and above a particular temperature,called Kraft temperature.
Discussion
19520.

When the same charge is passed through the solutions of different electrolytes in series, the amountsof elements deposited in the electrodes are in the ratio of their

Answer»

atomic NUMBERS
atomic weights
specific GRAVITIES
EQUIVALENT weights
Discussion
19521.

What is corrosion? Describe the electrochemical phenomenon of rusting of iron

Answer»

SOLUTION :CORROSION is the process of slowly EATING away of the metal due to attack of the atmospheric gases on the surface of the metal resulting into the formation of compounds such as OXIDES, sulphides, carbonate, etc. the corrosion of iron is called rusting. Accrording the theory of rusting impure iron surface behaves as a small electrochemical CELL in the presence of water containing dissolved oxygen or `CO_(2)`.
Discussion
19522.

Which amount of chlorine gas liberated at anode, if 1 ampere current is passed for 30 minutes from NaCl solution?

Answer»

`0.66` moles
`0.33` moles
`0.66` g
`0.33`g

Solution :`2CL^(-) to Cl_2 + 2e^(-)`
`Q = It "" ` Amonut of current passed `= 1 xx 30 xx 60 = 1800 C`
The amount of `Cl_2` liberated by passing 1800 coulomb of electric charge
`=(1 xx 1800 xx 71)/(2 xx 96500)`
`= 0.66 g`.
Discussion
19523.

When cumene is oxidised in the presence of air followed by treatment with dilute acid, the products obtained are

Answer»

BENZOIC ACID and Methanol
Phenol and Acetone
Benzoic acid and Acetone
Phenol and Acetaldehyde

Answer :B
Discussion
19524.

Which does not react with cold water :

Answer»

SiC
AlN
`CaC_(2)`
`Al_(4)C_(3)`

SOLUTION :SiC : Covalent network SOLID do not REACT with water.
Discussion
19525.

Which of the following elements hasthe highest electronegativity ?

Answer»

F
He
Na
Ca

Answer :A
Discussion
19526.

Which is corrent Lewis structure with formal charge on particular atom?

Answer»




SOLUTION :Lewis structure has OCTET rule FOLLOWED for all the ATOMS.
Discussion
19527.

Which has maximum freezing point ?

Answer»

1 molar of NACL solution
1 molar of KCL solution
1 molar of `CaCl_2` solution
1 molar of urea solution

Answer :D
Discussion
19528.

When benzene diazonium chloride solution is boilded, it yields

Answer»

Benzene
Aniline
Phenol
Chlorobenzene

Solution :
Discussion
19529.

Which of the following polymer is used for coating as a thin layer on the inner side of nonsticky untensil ?

Answer»

BAKELITE
PVC
Buna-S
Teflon

Answer :D
Discussion
19530.

Which is least stable in aqueous medium?

Answer»

`Fe^(2+)`
`Co^(2+)`
`Ni^(2+)`
`MN^(2+)`

Solution :`Fe^(2+)(3D^(6))` is readily oxidised to `Fe^(3+)(3d^(5))` in AQUEOUS solution which is more STABLE
Discussion
19531.

What is the time in sec) required for depositing all the silver present in 125 ml of 1M AgNO_3solution by passing a current of 241.25 amperes ? (1F=96500 coulombs)

Answer»

10
50
1000
100

Answer :B
Discussion
19532.

Which of the following are example of synthetic rubber ?

Answer»

POLYCHLOROPRENE
POLYACRYLONITRILE
Buna-N
cis-polyisoprene

Answer :A::C
Discussion
19533.

Which one of the following pair is the strongest pesticide

Answer»

666 and ether
D.D.T. and 666
Chloroform and BENZENE hexachloride
ISOCYANIDES and alcohol

Answer :B
Discussion
19534.

What are alloys ? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

Answer»

Solution :Alloys : A alloy is a HOMOGENEOUS mixture of two or more metals or non-metals. It is prepared by blending the metals (and / or non-metal) in molten state.
An important alloy containing lanthanoid metal (-95%) iron (-5%), traces of S, C, CA and AL is misch metal.
MISCHMETAL is used in Mg-based alloy to PRODUCE bullets, shell and lighter flint.
Discussion
19535.

Which compound does not form iodoform with alkali and iodine ?

Answer»

ACETONE
ETHANOL
Diethyl KETONE
Isopropyl alcohol

Answer :3
Discussion
19536.

Which acts as poison for Pd-charcoal in Lindlar's catalyst ?

Answer»

`BaSO_4`
Quinoline
Both (a) and (B)
None

Answer :C
Discussion
19537.

Which will lead to a change in the rate constant K of a reaction:

Answer»

A CHANGE in the pressure
Change in temperature
Change in the VOLUME of the REACTION vessel
All

Answer :B
Discussion
19538.

The standard potential of the following cell is 0.23 V at 15^@C and 0.21V at 35^@C (Pt) H_2(g) |HCl(aq)|AgCl(s)|Ag(s) Calculate Delta H^@ and Delta S^@ for the cell reaction by assuming that these quantities remain unchanged in the range 15^@ to 35^@C

Answer»

Solution :`(DeltaG^@)_(298)=-nFE^@=-1 times 96500times 0.23=-22195 J =-22.195 kJ`
`(DELTA G^@)_(398)=-1 times 96500 times 0.21=-20265 J=-20.265 kJ`
Now we have
H^@-T DeltaS^@`
`therefore -22.195 =Delta H^@-288 Delta S^@`
and `-20.265 =Delta H^@-308.Delta S^@`
for these equations, we GET
`Delta H^@=49.98 kJ`
`Delta S^@=-96.50kJ`
Discussion
19539.

Write the IUPAC name of major product formed in Friedel-Crafts acyfation of a anisole

Answer»

SOLUTION :4 METHOXY ACETOPHENONE
Discussion
19540.

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH^(-) ion- (a) CH_(3)-underset(C_(2)H_(5))underset(|)(C)HBr (b) CH_(3)underset(C_2H_5)underset(|)overset(Br)overset(|)(C)-CH_(3) (c) CH_(3)underset(C_2H_5)underset(|)(C)H-CH_(2)Br.

Answer»

(a)
(a),(B),(c)
(b),(c)
(a),(c)

Solution :Hint: The compound (a) CONTAINS a chiral carbon attached to HALOGEN, so it reacts with `OH^(-)` to FORM racemic alcohol.
Discussion
19541.

Why can’t aluminium be reduced by carbon ?

Answer»


Answer :Al is STRONGER REDUCING AGENT than CARBON.
Discussion
19542.

The standard potential of the following cell is 0.23 V at 15^@C and 0.21V at 35^@C (Pt) H_2(g) |HCl(aq)|AgCl(s)|Ag(s) Calculate the solubility of AgCl in water at 25^@C Given: E_(Ag^+,Ag)^@=0.80V at 25^@C

Answer»

Solution :In the given cell
`E_(cell)^@=E_(AgCl,Cl^-)^@-E_(H^+,H_2)^@`
`0.22=E_(AgCl,Cl^-)-0`…..(AVERAGE VALUE of `E_(cell)^@` is considered )
or `E_(AgCl,Cl^-)=0.22`
Let us now consider the following cell to calculate `K_(sp) (AgCl)`
`Ag=Ag^+ +e, E^@=-0.8` (given)
`AgCl+e=Ag+Cl^(-),E^@=0.22` (calculated)
`therefore` for the cell REACTION `AgCl=Ag^+ +Cl^-`
`E_(cell)=(E_(AgCl,Cl^-)^@-E_(Ag^+,Ag)^@)-0.0591/1 log[Ag^+][Cl^-]`
At equilibrium `E_(cell)=0 and R.Q=K_(sp)`
`therefore E_(AgCl,Cl^-)^@-E_(Ag^+,Ag)^@=0.0591 log K_(sp)`
`0.22-0.8=0.0591 log K_(sp)`
`therefore K_(sp)=1.535 times 10^-10`
`therefore` solubility of `AgCl=sqrt(K_(sp))=sqrt(1.535 times 10^-10)`
`=1.239 times 10^-5 mol e//L`
Discussion
19543.

When n-butyl magnesium bromide is treated with water, the product is _______.

Answer»

isobutane
n-butane
n-butyl alcohol
isobutyl alcohol

Answer :B
Discussion
19544.

Which of the following pairs form the same osazone ?

Answer»

Glucose and fructose
Glucose and GALACTOSE
Glucose and ARABINOSE
Lactose and maltose

ANSWER :A
Discussion
19545.

Write IUPAC name of the following : .

Answer»

SOLUTION :3,5 Dimethylphenylethanoate
Discussion
19546.

Which reagent is used to convert ethylene glycol to ethylene?

Answer»

HI
`I_2`
`PI_3`
CONC. `H_2SO_4`

SOLUTION :`PI_3`
Discussion
19547.

The species having bond order different from that in CO is :

Answer»

`NO^(-)`
`NO^(+)`
`CN^(-)`
`N_(2)`

Solution :`CO : KK(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2p_(X)))^(2)(pi_(2p_(y)))^(2)(sigma_(2p_(z)))^(2)`
`B.O=(8-2)/(2)=3`
`NO^(-):KK(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2p_(x)))^(2)(pi_(2p_(y)))^(2)(sigma_(2p_(z)))^(2)(pi_(2p_(x))^(**))^(1)(pi_(2p_(y))^(**))^(1)`
`B.O.=(8-4)/(2)=2`
`NO^(+):KK(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2p_(x)))^(2)(pi_(2p_(y)))^(2)(sigma_(2p_(z)))^(2)`
`B.O.=(8-2)/(2)=3`
`CN^(-): KK(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2p_(x)))^(2)(pi_(2p_(y)))^(2)(sigma_(2p_(z)))^(2)`
`B.O.=(8-2)/(2)=3` `N_(2):KK(sigma_(2s))^(2)(sigma_(2s)^(**))^(2)(pi_(2p_(x)))^(2)(pi_(2p_(y)))^(2)(sigma_(2p_(z)))^(2)`
`B.O.=(8-2)/(2)=3`
`therefore NO^(-)`has different BOND order.
Discussion
19548.

Which group CANNOT be introduced in an aromatic ring by the nucleophilic substitution of halide group?

Answer»

`-OH`
`-NH_2`
`-CN`
`-H`

ANSWER :C
Discussion
19549.

Which type of isomerisms are possible with the molecular formula Co(NO_2)_3. 2H_2NCH_2CH_2NH_2.

Answer»

Solution :Linkage, geometrical and optical isomerisms are possible.Due to the PRESENCE of AMBIDENTATE LIGAND.
`NO_2,` it exhibits linkage isomerism.` [Co(en)_2(NO_2)_2]NO_2`can exhibit geometrical isomerism and its cis ISOMER is optically active.
Discussion
19550.

Which can not be used as acylating agent:

Answer»

`RCOBr`
`(RCO)_2O`
`RCH_2COCl`
`RCONH_2`

ANSWER :D
Discussion