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5701.

What is the use of platinum foil in the hydrogen electrode ?

Answer»

SOLUTION :It is USED for the in and out FLOW of ELECTRONS.
Discussion
5702.

Which of the following is an example of a complex salt

Answer»

Cuprammoniumsulphate
Ferrous AMMONIUM sulphate
BLEACHING POWDER
POTASSIUM bisulphate

ANSWER :A
Discussion
5703.

Which will not affect the degree of ionization

Answer»

Temperature
Concentration
TYPE of SOLVENT
CURRENT

Solution :Current does not effect the degree of IONIZATION.
Discussion
5704.

What is ZSM-5 ? What is its formula ?

Answer»

SOLUTION :ZMS-5 is a zeolte sieve of molecular porosity 5. Its formula is `H_(X)[(AlO_(2))_(x)(SiO_(2))_(96-x)].[16H_(2)O.`
Discussion
5705.

Which of the following species is /are superoctet molecule ?

Answer»

`AlF_(3)`
`SiCl_(4)`
`XeF_(2)`
`IC l_(3)`

Answer :C::D
Discussion
5706.

Which one is a completely fluorinated polymer ?

Answer»

NEOPRENE
TEFLON
ORLON
PVC

SOLUTION :Teflon
Discussion
5707.

Write the product formed when glucose is treated with HI.

Answer»


ANSWER :A
Discussion
5708.

What are fuel cells ?

Answer»

Solution :The CELLS which convents chemical heat ENERGY into ELECTRICAL energy by the combustion of fuels like `H_2,CH_4,CH_2OH` are called FUEL cells .
Discussion
5709.

Which of the following is nitrating agent?

Answer»

`HNO_(2)`
`AgNO_(3)`
`HNO_(3)`
`KNO_(3)`

ANSWER :C
Discussion
5710.

Which one of the following has the highest molar conductivity?

Answer»

diamminedichloroplatinum (II)
tetraamminedichlorocobalt (III) chloride
potassium HEXACYANOFERRATE (II)
hexaaquachromium (III) chloride

Answer :D
Discussion
5711.

Which of the following transformations is n p type ?

Answer»

`""_(13)^(27)Al+""_(1)^(2)Hto""_(12)^(25)Mg+""_(2)^(4)He`
`""_(4)^(11)B+""_(1)^(1)Hto""_(6)^(11)C+""_(0)^(1)n`
`""_(3)^(7)LI+""_(1)^(2)Hto""_(3)^(8)Li+""_(1)^(1)H`
`""_(13)^(27)Al+""_(0)^(1)nto""_(12)^(27)Mg+""_(1)^(1)H`

Answer :D
Discussion
5712.

Which of the following will form negatively charged colloided solution ?

Answer»

100 ml 0.1 M AG `NO_(3)+` 100 ml 0.1 MKI
100 ml 0.2 M Ag `NO_(3)` + 100 ml 0.1 MKI
100 ml 0.1 M ag `NO_(3)` +100 ml 0.2 MKI
100 ml 0.1 M Ag` NO_(3)` + 200 ml 0.1 MKI

ANSWER :C
Discussion
5713.

To determine molar solubility of an unknown metal hydroxide, M(OH)_(3) in 0.00101M NaOH, Jane adds 0.250g of M(OH)_(3) solid to 200mL of a 0.00101M NaOH solution and stirred for a long time.A cloudy solution is formed. The undissolved hydroxide is separated from the solution by filtratin 25.00mL of filtrate is pipetted into a flask 30mL of water is added adn then the solution is titrated with 0.00444M HCl solution 13mL of HCl is used for this titration. The solubility product of M(OH)_(3) is

Answer»

`4.8xx10^(-9)`
`5.6xx10^(-11)`
`2.1xx10^(-11)`
`5.34xx10^(-12)`

ANSWER :D
Discussion
5714.

The reduction potentials of Zn, Cu, Fe and Ag are in the increasing order:

Answer»

`ZN, CU, FE, Ag`
`Cu, Ag, Fe, Zn`
`Ag, Cu, Fe, Zn`
`Fe, Zn, Cu, Ag`

Answer :C
Discussion
5715.

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

Answer»

Magnesite is the ore of magnesium
A mineral containing ZnS and PbS togetheris separated in froth floatation PROCESS by adding NACN as DEPRESSANT
White bauxite is purified by HALL's process
Extraction of zinc from zinc blende is possible by self reduction

ANSWER :A::B
Discussion
5716.

To determine molar solubility of an unknown metal hydroxide, M(OH)_(3) in 0.00101M NaOH, Jane adds 0.250g of M(OH)_(3) solid to 200mL of a 0.00101M NaOH solution and stirred for a long time.A cloudy solution is formed. The undissolved hydroxide is separated from the solution by filtratin 25.00mL of filtrate is pipetted into a flask 30mL of water is added adn then the solution is titrated with 0.00444M HCl solution 13mL of HCl is used for this titration. If Jane carelessly added 20mL of water tothe flask instead of 30mL how would this affect the determination of solubility product (K_(sp)) and molar solubility? (1) The value of K_(sp) determined by Jane would be same as true value (2) The value of K_(sp) determined by Jane would be higher than the true value. (3) The value of K_(sp) determined by Jane would be lower as true value. (4) The molar solubility of M(OH)_(3) determined by Jane woud be same as true value. (5) The molar solubility of M(OH)_(3) determined by Jane would be higher than true value. (6) The molar solubililty of M(OH)_(3) determined by Jane would be lower than the true value

Answer»

1 and 4
2 and 5
3 and 6
1 and 6

Answer :A
Discussion
5717.

The vapour pressure of a solution of the liquids A (p^(@)=80m m Hg and X _(A) =0.4) and (p^(@) =120 mn Hg and X _(B) =0.6) is found to be 100 mm Hg. It shows that the solution exhibits

Answer»

<P>positive deviation from ideal behaviour
negative deviation from ideal behaviour
ideal behaviour
positive deviation for lower CONE. and negative for higher cone.

Solution :`p _("TOTAL") = p_(A)^(@)x x _(A) +p_(B)^(@) x x_(B)`
`=80.0 x0.4 +120.0 x0.6 =10` 4M m Hg
Thte observed ` P _("total")` is 100 mm Hg which is less then 104 mm Hg. HENCE the solutio shows negative dcviation.
Discussion
5718.

Which of the following exists as zwitterion?

Answer»

p-aminophenol SALICYLIC acid
salicylic acid
sulphanilic acid
ethanolamine

Answer :C
Discussion
5719.

Write the name and structure of the monomer of neoprene rubber .

Answer»

SOLUTION :CHLOROPRENE (2-chloro-1,3-butadiene),`CH_(2)=C(CI)CH=CH_(2)`.
Discussion
5720.

The total pressure exerted in ideal binary solution is given by P = P_(A)^(@)X_(A) + P_(B)^(@) X_(B) " where " P_(A)^(@) & P_(B)^(@) are the respective vapour pressure of pure components and X_(A) & X_(B) are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Dalton's law of partial pressure. Y_(A) = (P_(A)^(@) X_(A))/(P) If total pressure exerted in an ideal binary solution is given by P = (5400)/(60 + 30Y_(A))mm " of " Hg. The more volatile liquid is

Answer»

LIQUID A
liquid B
both are same
it DEPENDS on the AMOUNT of A and B

Answer :B
Discussion
5721.

Which oth following graph is correct for solubility of O_2 and N_2 in water at 298

Answer»


(##AAK_MCP_16_NEET_CHE_E16_018_Q02##)
(##AAK_MCP_16_NEET_CHE_E16_018_Q03##)

ANSWER :A
Discussion
5722.

The total pressure exerted in ideal binary solution is given by P = P_(A)^(@)X_(A) + P_(B)^(@) X_(B) " where " P_(A)^(@) & P_(B)^(@) are the respective vapour pressure of pure components and X_(A) & X_(B) are their mole fraction in liquid phase. And composition of the vapour phase is determined with the help of Dalton's law of partial pressure. Y_(A) = (P_(A)^(@) X_(A))/(P) If total pressure exerted in an ideal binary solution is given by P = (5400)/(60 + 30Y_(A))mm " of " Hg. If the value of Y_(A) = 0.4 then the value of X_(B) is

Answer»

0.6
0.25
0.4
0.5

Answer :D
Discussion
5723.

To determine molar solubility of an unknown metal hydroxide, M(OH)_(3) in 0.00101M NaOH, Jane adds 0.250g of M(OH)_(3) solid to 200mL of a 0.00101M NaOH solution and stirred for a long time.A cloudy solution is formed. The undissolved hydroxide is separated from the solution by filtratin 25.00mL of filtrate is pipetted into a flask 30mL of water is added adn then the solution is titrated with 0.00444M HCl solution 13mL of HCl is used for this titration. The molar concentration of hydroxide ion in filtrate solution is

Answer»

`0.0015M`
`0.0023 M`
`0.00333M`
`0.00462M`

ANSWER :B
Discussion
5724.

When mercuric iodide is added to the aqueous solution of potassium iodide the:

Answer»

FREEZING POINT is raised
Freezing point is lowered
Freezing point does not CHANGE
BOILING point does not change

ANSWER :A
Discussion
5725.

Which of the following polymers may be classified as step growth polymer-

Answer»

teflon
PVC
polyethene
NYLON 6,6

Solution :nylon 6,6
Discussion
5726.

Which of the following bonds will be non-polar ?

Answer»

N_H
C_H
F-F
O-H

Answer :C
Discussion
5727.

Which one of the following condition will increase the voltage of the cell represented by the equation : Cu_((s))+2Ag_((aq))^(+)hArr Cu_((aq))^(+)+2Ag_((s))

Answer»

increase in the DIMENSION of CU electrode
increase in the dimension of AG electrode
increase in the dimension of `Cu^(2+)` ions
increase in the dimension of `Ag^(+)`ions

Solution :Since reduction occurs at Ag electrode, hence increase in the concentration of `Ag^(+)` or DECREASE in concentration of `Cu^(2+)` will increases the voltage.
Discussion
5728.

Which of the following ferromagnetic ?

Answer»

Ni
CO
`Fe_(3)O_(4)`
All are CORRECT

SOLUTION :Ni, Co and`Fe_(3)O_(4)` allare FERROMAGNETIC.
Discussion
5729.

The weight in grams of a non-volatile solute (molar mass = 60) to be dissolved in 90g of water to produce a relative of V.P. of 0.02 is

Answer»

4
8
6
10

Solution :`(p_(1)^(o)-p)/p_(1)^(o) = x_(2) = (W_(2)//M_(2))/(W_(1)//M_(1)) = (W_(2) XX M_(1))/(W_(1) xx M_(2))`
`0.02 = (W_(2) xx 18 xx 10^(-3) KG mol^(-1))/(90 xx 10^(-3) kg xx 60 xx 10^(-3) kg mol^(-1))`
`:. W_(2) = (0.02 xx 60 xx 90 xx 10^(-3))/18 kg = 6 xx 10^(-3) kg = 6g`
Discussion
5730.

Which of the following ions is coloured in aqueous solution ?

Answer»

`Lu^(3+) (Z=71)`
`SC^(3+) (Z=21)`
`LA^(3+) (Z=57)`
`Ti^(3+) (Z=22)`

Answer :D
Discussion
5731.

When excess sodium thiosulphate is added to AgBr, the product formed is

Answer»

`Ag_2S_2O_3`
 `NA[AG(S_2,O_3)]`
 `Na_3[AgBr_4]`
 `Na_3[Ag(S_2O_3)_2]`

ANSWER :D
Discussion
5732.

Which of the following is natural polymer ? Buna-S, Proteins, PVC

Answer»

SOLUTION :PROTEINS.
Discussion
5733.

Two electrochemical cells, Zn^(2+)|Zn^(2+)||Cu^(2+)|Cu and Fe|Fe^(2+)||Cu^(2+)|Cu are connected in series. What will be the net e.m.f. of the cell at 25^(@)C ? Given : E^(@) of Zn^(2+)|Zn=-0.76" V", Cu^(2+)|Cu=+0.34" V",Fe^(2+)|Fe=-0.41" V"

Answer»

`+1.85" V"`
`-1.85" V"`
`+0.83" V"`
`-0.83" V"`

Solution :(a) emf of the cell,`Zn(s)|Zn^(2+)(aq)||CU^(2+)(aq)|Cu(s)` is :
`E_(Cu^(2+)//Cu)^(@)-E_(Zn^(2+)//Zn)^(@)=+0.34-(-0.76)=1.10" V"`
emf of the cell, `Fe(s)|Fe^(2+)(aq)||Cu^(2+)(aq)|Cu(s)` is :
`E_(Cu^(2+)//Cu)^(@)-E_(Fe^(2+)//Fe)^(@)=+0.34-(0.41)=0.75" V"`
Since the two electrodes are connected in SERIES, the net emf of cell is :
`=1.10+0.75=+1.85" V"`
Discussion
5734.

Which one of the followingstatement regarding photochemicalsmogis notcorrect ?

Answer»

Photochemicalsmogis formed by the combinationof SMOKE, dustand fogcontainingsulphur dioxide from polluted air.
Photochemicalsmogcausesirritation ineyes and THROAT
CARBON monoxidedoesnot play any role in photochemical smogformation
Photochemical smogis oxidisingin nature.

Solution :Classicalsmogis FORMEDBY the combinationof smoke,dust and fogcontainingsulphurdioxidefrompolluted air.
Discussion
5735.

What are correct statements ?

Answer»

Metals SOLS POSSESS '-ve' CHARGE on scattered particle 
`FeCl_3` on dissolving in hot water gives a +ve sol 
Mixing two opposite sols causes coagulation 
Prolonged electrolysis stabilises a sol 

Solution :`FeCl_3` in hot water +ve sol, metal sols are -ve sols
coagulation takes PLACE with MUTUAL coagulation
Discussion
5736.

Write the IUPAC name of the isomer of the following complex : [Pt(NH_(3))_(2)Cl_(2)]

Answer»

SOLUTION :ISOMERS of `[PT(NH_(3))_(2)Cl_(2)]` are
Cis / trans-diamminedichloridoplatinum(II)
Discussion
5737.

Treatement of cyclobutyl methylamine with nitrous acid does not give

Answer»




ANSWER :D
Discussion
5738.

Which of the following has the maximum number of unpaired electrons

Answer»

`MG^(+2)`
`Ti^(+3)`
`V^(+3)`
`FE^(+2)`

Answer :D
Discussion
5739.

To a sample of an element X (at. wt. 70) another element Y (at. wt. 120) is to beadded as an impurity. The ratio of the atoms in the mixture is to be 1:10^(-7). How many grams of Y will be required for 35 g of X?

Answer»

SOLUTION :`6.0 XX 10^(-6) G`
Discussion
5740.

Calculate the value of van't Hoff factor for a dilute solution of K_(2)SO_(4) in water.

Answer»

SOLUTION :`K_(2)SO_(4)to2K^(+)+SO_(4)^(2)`
` ALPHA=1, n=3, alpha=(i-1)/(n-1)`
`1=(i-1)/(3-1)`
i=2+1=3.
Discussion
5741.

Which one of the following charrs when warmed with concentrated H_2SO_4 ?

Answer»

CARBOHYDRATES
Proteins
Fats
Hydrocarbon.

Solution :Carbohydrates GET CHARRED DUE to DEHYDRATION
Discussion
5742.

Which of following compound causes red rashed, if it comes in direct contact with skin ?

Answer»

`C Cl_(4)`
`CHCl_(3)`
`CH_(3)Cl`
`CH_(2)Cl_(2)`

ANSWER :D
Discussion
5743.

The reason for exceptionally high boiling point of water is

Answer»

Its HIGH specific heat
Its high dielectric constant
Low ionization of water molecules
HYDROGEN BONDING in the molecules of water

Solution :Hydrogenbonding increases the boiling point of compound.
Discussion
5744.

Which of the following has largest number of significant figures?

Answer»

11.309
1.00004
615
9.035

Answer :B
Discussion
5745.

Which of the following does not give amine ?

Answer»

`RX+NH_(3)rarr`
`RCONH_(2)+4[H]OVERSET(LiAlH_(4))rarr`
`RCN+H_(2)Ooverset(H^(+))rarr`
`RCH=NOH+[H]overset(Na)UNDERSET(C_(2)H_(5)OH)rarr`

Answer :C
Discussion
5746.

Which of the following reactions would proceed inn the forward direction ?

Answer»

`[Co(NH_(3))_(6)]^(3+)+3en iff [Co(en)_(3)]^(3+)+6NH_(3)`
`2Na[Al(OH)_(4)]+CO_(2) rarr 2AL(OH)_(3)+Na_(2)CO_(3)+H_(2)O`
`AlN+H_(2)O rarr Al(OH)_(3)+NH_(3)`
all of the above

Solution :If the `DeltaG rarr`Negative, reaction proceed in the forward DIRECTION.
(a) `[Co(NH_(3))_(6)]^(3+)+3 en iff [Co(en)_(3)]^(3+)+6NH_(3)` stability of `[Co(en)_(3)]^(3+) gt [Co(NH_(3))_(6)^(3+)`
(B) `2Na[Al(OH)_(4)]+CO_(2) rarr 2Al(OH)_(3)+Na_(2)CO_(3)+H_(2)O` Precipitation reaction
( c) `AlN+H_(2)O rarr Al(OH)_(3)+NH_(3)` Evolved gas.
Discussion
5747.

The state of hybridization of the central atom is not the same as in the others :

Answer»

<P>`B` in `BF_(3)`
`O` in `H_(3)O^(+)`
`N` in `NH_(3)`
`P` in `PCl_(3)`

ANSWER :A
Discussion
5748.

When RNA is hydrolysed , there is no relationship among the quantities of different bases obtained ? What does this fact suggest about the structure of RNA ?

Answer»

Solution :A DNA molecule has two strands in which the FOUR complementary bases pair each other , i.e., cytosine (C) always pairs with guanine (G) while thymine (T) always pairs with adenine (A) . THEREFORE , when a DNA molecule is hydrolysed , the molar amounts of cytosine is always equal to that of guanine and that of adenine is always equal to that of thymine. Since in RNA there is no RELATIONSHIP between the quantities of four bases (C,G,A and U) obtained, therefore , the base - pairing principle ,i.e., A pairs with U and C pairs with G is not followed. Therefore , UNLIKE , DNA , RNA has a single strand.
Discussion
5749.

Which of the following gains electrons more easily

Answer»

`X ^(-) (Cl^(-) , Br^(-), I^(-))`
`OH^(-)`
`H^(-)`
NONE

ANSWER :D
Discussion
5750.

What is the coordination number of atoms:In a body-centred cubic structure?

Answer»

Solution :in a BODY cebterd CUBIC STRUCTURE coordition number is 8
Discussion