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18701.

Using standard electrode potentials, predict the reaction, if any, that ocurs between Fe^(3+)(aq) and I^(-)(aq) E_(Fe^(3+)(aq)//Fe^(2+)(aq))^(@)=0.77V,E_(I_(2)//2I^(-)(aq))^(@)=0.54V

Answer»

Solution :`2FE^(3+)+2I^(-)2Fe^(2+)I_(2),E_(CELL)^(@)+E_(2I^(-)//I_(2))^(@)=0.77+(-0.54)=+0.23V`
Discussion
18702.

What is Rochelle salt ?

Answer»

Solution :Alkaline solution of COPPER Sulphate containing SODIUM POTASSIUM tartrate is called as ROCHELLE SALT, which is a complexing agent.
Discussion
18703.

Which of the compounds with molecular formula C_(5)H_(10) yields acetone on ozonolysis ?

Answer»

2-Methyl-1-butene
2-Methyl-2-butene
3-Methyl-1-butene
CYCLOPENTANE

SOLUTION :`underset("2-Methyl-2-butene")(CH_(3) - underset(CH_(3))underset(|)(C) = CH - CH_(3)) underset(Zn, H_(2)O)overset(O_(3))rarr underset("ACETONE")(CH_(3) - underset(CH_(3))underset(|)(C) = O) + CH_(3)CHO`
Discussion
18704.

The standard potential at 25^(@)C for the following half reaction are given against them Zn^(2+)+2etoZn,E^(@)=-0.762V Mg^(2+)+2etoMg,E^(@)=-2.37V When zinc dust is added to the solution of MgCl_(2)

Answer»

`ZnCl_(2)` is formed
Zinc DISSOLVES in the solution
No reaction takes place
Mg is precipitated

Solution :
this type of reaction does not OCCUR because
`Mg^(2+)E^(o)=-2.37V` while `ZN^(2+)E^(o)=-0.76V`.
Discussion
18705.

What happens when : (a) (CH_(3))_(3)C-OH is treated with Cu to 573 K, (b) Anisole is treated with CH_(3)Cl/anhydrous AlCl_(y). (c ) Phenol is treated with Zn dust ? Write chemical equations in support of your answer.

Answer»

Solution :(a) `(CH_(3))_(3)C-OH` is treated with Cu at 573 K
`(CH_(3))_(3)C-OH` undergoes dehydration
`CH_(3)-OVERSET(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-OH overset(Cu)underset(573K)RARR CH_(3)-overset(CH_(3))overset("|")"C "=CH_(2)`
(B) Anisole is treated with `CH_(3)Cl`/ANHYDROUS `AlCl_(3)`

(c ) Phenol is treated with zinc dust
Discussion
18706.

When sodium chloride solution is electrolysed, the gas that is liberated at the cathode is

Answer»

Oxygen
Hydrogne
Chlorine
Air

Answer :B
Discussion
18707.

The unit of the a reaction is ..............

Answer»

SOLUTION :`"MOL L"^(-1)s^(-1)`
Discussion
18708.

Which of the following statement is correct for an ideal solution ?

Answer»

The value of `Delta H` and `Delta V` will not be ZERO.
Vapour pressure of such solution is EITHER higher or lower than PREDICTED by Raoult's law.
Mixture of Phenol and ANILINE is an example of an IDEAL solution.
The value of `Delta H` and `Delta V` will be zero.

Answer :D
Discussion
18709.

What is the state of hybridization of carbon and nitrogen atoms in alkyl amines?

Answer»

SOLUTION :In ALKYL AMINES, nitrogen as well as carbon are `sp^3` HYBRIDIZED.
Discussion
18710.

What change in molar energy (in J) would be associated with an atomic transition giving rise to a radiation of 1 Hz frequency: (h=66xx10^(-34) Js) Report your answer after multiplying by 10^10

Answer»


ANSWER :4
Discussion
18711.

Waxes are long chain compounds of

Answer»

Acids
Alcohols
Esters
Ethers

Solution :EAX are LONG CHAIN ESTER.
Discussion
18712.

Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?

Answer»

`H_(2)` (excess)/PT
`LiAlH_(4)` in ether
`FE and HCl`
Sn and HCl

Solution :`LiAlH_(4)//`ether reduces aryl nitro COMPOUNDS to AZO compounds i.e.,
`underset("Nitrobenzne")(2C_(6)H_(5)NO_(2)) overset(LiAlH_(4)//"Ether")to underset("Diazobenzene")(C_(6)H_(5)N=NC_(6)H_(5))`
Discussion
18713.

White phosphorous reacts with caustic soda to give phosphine and sodium hypophosphite. In this reaction phosphorous undergoes

Answer»

OXIDATION
REDUCTION
Both
NONE of these

ANSWER :3
Discussion
18714.

Which of the following is the biodegradable polymer of polymide class?

Answer»

DEXTRON
NYLON -2-Nylon-6
Nylon-6,6
PHBV

Answer :B
Discussion
18715.

Which of the following statements is not correct for the reaction : 4A + B rarr2C +2D

Answer»

the rate of disappearance of B is one - fourth the rate of disappearance of A.
the rate of appearance of C is one - HALF the rate of disappearance of B .
the rate of formation of D is one -half the rate of consumption of A .
the rate of formation of C and D are EQUAL .

SOLUTION :(B) The rate of appearance of C is double the rate of disappearance of B is correct .
Discussion
18716.

Walls of stomach secrets acids to make the stomach acidic and for the digestion of food, when the acid is secreted in excess it leads to indigestion, heart burn, (or) gastric ulcers. The chemicals which are used to neutralize the excess acid present in the gastric juice and to raise the pH ofstomach upto an appropriate level are called antacids. Antacids does not contains

Answer»

NaOH
`Mg(OH)_2`
`AL(OH)_3`
`NaHCO_3`

Solution :NaOH is not an ANTACID
Discussion
18717.

Walls of stomach secrets acids to make the stomach acidic and for the digestion of food, when the acid is secreted in excess it leads to indigestion, heart burn, (or) gastric ulcers. The chemicals which are used to neutralize the excess acid present in the gastric juice and to raise the pH ofstomach upto an appropriate level are called antacids. The acid secreted in stomach?

Answer»

`H_2SO_4`
`HCL`
`HNO_3`
`H_3PO_4`

SOLUTION :HCl SECRETED in STOMACH
Discussion
18718.

The temperature of a certain mass of a gas is increased from 50 to 51^(@)C at same pressure . The volume of the gas

Answer»

remains same
will increase by `1//`273th of its volume at 273K
will increase by `1//273K` of its volume at `50^(@)C`
will increase by an AMOUNT `( 50)/( 51) xx ( 1)/( 273)`

Answer :B
Discussion
18719.

Walls of stomach secrets acids to make the stomach acidic and for the digestion of food, when the acid is secreted in excess it leads to indigestion, heart burn, (or) gastric ulcers. The chemicals which are used to neutralize the excess acid present in the gastric juice and to raise the pH ofstomach upto an appropriate level are called antacids. Which acts as natural antacid ?

Answer»

MILK
Butter
HONEY
CURD

SOLUTION :Milk is ANTACID
Discussion
18720.

Which of the following are pseudohalide ions?

Answer»

`SCN^(-)`
`OCN^(-)`
`CN^(-)`
`ICl_(2)^(-)`

ANSWER :A::B::C
Discussion
18721.

Which reaction involves oxidation nor reduction ?

Answer»

`Cr_2 0_7^(2-)`
`NO_3^(-)`
`OCL^-`
`S_2^(-)`

ANSWER :C
Discussion
18722.

Which is incorrectly matched : - {:("Metals","Refining method"),(Ge,"Liquation"),(Sn,"Polling"),(Zn,"Distillation"),(Al,"Electro-refining"):}

Answer»

1
2
3
4

Solution :GE is REFINED by ZONE REFINING
Discussion
18723.

Which of the processes is used in thermite welding?

Answer»

`TiO_2 + 4NA to TI + 2Na_2O`
`2AL + Fe_(2)O_3 to Al_2O_3 + 2FE` 
`SnO + 2C to Sn + 2Co`
`Cr_2O_3 + 2Al to Al_2O_3 + 2Cr` 

Answer :D
Discussion
18724.

Which one of the following is formed when benzaldehyde reacts with acetic anhydride?

Answer»

Cinnamaldehyde + Acetaldehyde
Cinnamic acid + ACETIC acid
Benzyl alcohol + Benzoic acid
BENZAL ANILINE + Acetic acid

SOLUTION :Cinnamic acid + Acetic acid
Discussion
18725.

Which of the following is not a colligative property.

Answer»

LOWERING of vapour pressure
Freezing POINT
Osmotic pressure
ELEVATION of boiling point

Answer :B
Discussion
18726.

The typical reactions of olefinic bond are :

Answer»

ELECTROPHILIC ADDITION
Electrophilic SUBSTITUTION
NUCLEOPHILIC addition
Nucleophilic substitution

ANSWER :A
Discussion
18727.

When lead storage battery discharges

Answer»

`PbSO_(4)` is consumed
`SO_(2)` is FORMED
`H_(2)SO_(4)` is consumed
Pb is formed

SOLUTION :USE of `H_(2)SO_(4)` to react to form `PbSO_(4) therefore` DECREASE in concentration.
Discussion
18728.

The sum of the oxidation numbers of all the carbons in C_(6)H_(5)CHO is

Answer»

`+2`
0
`+4`
`-4`

Solution :In BENZALDEHYDE all CARBON atoms SHOW -4 oxidation state.
Discussion
18729.

Which of the following give azo dye test ?

Answer»

`C_6H_5NH_2`
`C_6H_5CH_2OH`
`CH_3CH_2NH_2`
`CH_3CH_2OH`.

ANSWER :A
Discussion
18730.

Which hologen can be purified by sublimation:

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

ANSWER :D
Discussion
18731.

When carbon are trapped into the crystal of iron, the defect is known as :

Answer»

Schottky DEFECT
Frenkel defect
Stoichiometric DEFECTS
INTERSTITIAL defect

Solution :It is a FACT.
Discussion
18732.

The staring substane for the preparation of CH_(3) is

Answer»

`CH_(3)OH`
`C_(2)H_(5)OH`
`CH_(3)CHO`
`(CH_(3))_(2)CO`

Answer :A
Discussion
18733.

Which among the following compound will exhibit optical isomerism

Answer»

Tert-butylamine
Sec-butylamine
Isobutylamine
n-butylamine

SOLUTION :To exhibit optical ISOMERISM, the compound must have the chiral centre.

Secondary AMINE has two DIFFERENT alkyl groups DIRECTLY attached to nitrogen atom.
Discussion
18734.

Yeast cell derive their energy from glucose by

Answer»

Glycolysis
Respiration formation
Formation
None of these

Answer :A
Discussion
18735.

Why are transition elements knows as d-block elements ?

Answer»

SOLUTION : Because the last electron ENTERS (n-1) d-orbital, i.e., d-orbital of the PENULTIMATE shell.
Discussion
18736.

Which polymer is used in the preparation of hose-pipe ?

Answer»

POLYSTYRENE
NEOPRENE
Teflon
Orlon

SOLUTION :Neoprene
Discussion
18737.

What is the role of coke in the extraction of iron from its oxides?

Answer»

Solution :Coke is USED as a reducing agent to OBTAIN metal OXIDE. Coke at a higher TEMPERATURE is ALSO converted to CO which again acts as reducing agent.
Discussion
18738.

What is phosphoresence ?

Answer»


Solution :White PHOSPHOROUS glows in the DARK DUE to OXIDATION which is called as phosphoresence.
Discussion
18739.

Whichreducingagentisemployedtogetcopperfrom theleachedlowgradecopperore?

Answer»

SOLUTION :Althoughzinc ` (E_(ZN^(2+)//Zn) =- 0*76V)`, iron` (E_(Fe^( 2 + )//Fe) =- 0*44 V)` and` H_2 (E^(@)_(H^(+)//H _2 ) = 0*00V)`all thethreecanbe USEDTO getcopperfromtheleachedlowgrade copper,yetscrapironbeingmuchcheaperthan zinc and` H _2`gas isusuallyused.
`"" Cu^( 2+ ) (aq) +Fe (s) to Cu(s) + Fe ^( 2 + ) (aq) `
Discussion
18740.

underset((2)H^(o+)//H_(2)O)overset((1) PhMgBr)to product (3^(@) alcohol) Number of equivalent of PhMgBr consumed in above reaction is/are:

Answer»

`1`
`2`
`4`
`3`

Answer :C
Discussion
18741.

Which of the following amino acid is neutral ?

Answer»

GLYCINE
ASPARTIC ACID
Lysine
Arginine

Solution :Glycine
Discussion
18742.

Which of the following statements about H_(3)BO_(3) is not correct ?

Answer»

It has a layer structure in which planar `BO_(3)` UNITS are joined by H-bonds
It is a strong tribasic acid
It is prepared by acidifying an aqueous solution of borax
It does not ACT as proton donor but acts as LEWIS acid by accepting hydroxyl ion.

Answer :B
Discussion
18743.

Which of the following diagram is correctly related to the Parke's process for the extraction of Ag form pb-Ag alloy?

Answer»

`AG-pb OVERSET("HEATING with "O_(2)) UNDERSET (("Cupellation"))rarr pure Ag`
`Ag-pb overset(" Distillaiton") rarr Pb_((G)) " and " Ag_((s))`
`Ag-pb overset("molted") underset ("Zn")rarr Zn-pb ` layer and Ag layer
`Ag-pb overset("molted") underset ("Zn")rarr Zn-Ag ` layer andpblayer

Answer :4
Discussion
18744.

Which of the following has longest C-O bond length ? (Free C-O bond length in CO is 1.128Å)-

Answer»

`Ni(CO)_(4)`
`[Co(CO)_(4)]^(Ѳ)`
`[FE(CO)_(4)]^(2-)`
`[MN(CO)_(6)]^(+)`

ANSWER :C
Discussion
18745.

Which of the follwoing statements is correct with reference to the ferrous and ferric ions:

Answer»

`Fe^(3+)` GIVES brown colour with POTASSIUM FERRICYANIDE
`Fe^(3+)` gives red colour with potassium thiocyanate
`Fe^(2+)` gives brown colour with ammonium thiocyanate
None of these

Answer :B
Discussion
18746.

What inspired N. Bartlett for carrying out reaction between Xe and PtF_(6) ?

Answer»

Solution :Neil Bartlett observed that `PtF_(6)` reacts with `O_(2)` to yield an IONIC solid, `O_(2)^(+) PtF_(6)^(-)`
`O_(2)(g) + PtF_(6)(g) rarr O_(2)^(+) [PtF_(6)]^(-)`
In this reaction, `O_(2)` gets oxidised to `O(2)^(+)` by `PtF_(6)`.
SINCE the first ionization enthalpy of Xe (1170 kJ `mol^(-)`) is fairly close to that of `O_(2)` molecule (1175 kJ `mol^(-)`), Bartlett thought that `PtF_(6)` should also OXIDISE Xe to `Xe^(+)`. This inspired Bartlett to CARRY out the reaction between Xe and `PtF_(6)`. When Xe and `PtF_(6)` were mixed, a rapid reaction took place and a red solid with the formula, `Xe^(+)PtF_(6)^(-)` was obtained.
`Xe + PtF_(6) overset(278 K) rarr Xe^(+)[PtF_(6)]^(-)`
Discussion
18747.

The solubility product of BaSO_(4) at 25^(@)C is 1.0 xx 10^(-9). What would be the concentration of H_(2)SO_(4) necessary to precipitate BaSO_(4) from a solution of 0.01 M Ba^(2) ions

Answer»

`10^(-9)`
`10^(-8)`
`10^(-7)`
`10^(-6)`

Solution :`BaSO_(4) hArr underset(underset(0.01)((S)))(Ba^(++)) + underset((S))(SO_(4)^(--))`
`K_(SP) = S^(2) = S xx S = 0.01 xx S`
`S_((SO_(4)^(2-))) = (K_(sp))/(S_((Ba^(++)))) = (1 xx 10^(-9))/(0.01) = 10^(-7)` mole/litre.
Discussion
18748.

The tendency to show complex formation is maximum in …….. Elements :

Answer»

s-block
p-block
d-block
f-block

Answer :C
Discussion
18749.

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25^@C. The equilibrium constant of the reaction would be

Answer»

`1.0 XX 10^10`
`2.0 xx 10^11`
`4.0 xx 10^12`
`1.0 xx 10^2`

ANSWER :A
Discussion
18750.

When trans-butene is reacted with Br_2 then product formed is -

Answer»

<BR>
meso-compounds
both B and C

Solution :With trans-but-2-ene, the PRODUCT of `Br_(2)`addition is optically inactive due to the FORMATION of SYMMETRIC meso-compounds.
Discussion