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5301.

Which of the following is best reducing agent to convert - COOH to - CH_2 - OH

Answer»

Fe+ CONC. HCL
`LiAlH_4`
`NaBH4`
Zn.Hg+ HCl

ANSWER :B
Discussion
5302.

Which of the following ions forms heavy salts?

Answer»

`ZN^(2+)`
`MN^(2+)`
`HG^(2+)`
`Na^(+)`

Solution :Heavier METAL ion `Hg^(2+)` forms heavier salts .
Discussion
5303.

Which acid has P-P linkage?

Answer»

HYPOPHOSPHORIC acid
Pyrophosphoric acid
Metaphosphoric acid
Orthophosphoric acid

Answer :A
Discussion
5304.

What happens when ethyl bromide is treated with alc. KOH?

Answer»

Solution :When ethyl BROMIDE is treated with ALCOHOLIC KOH solution ETHYLENE is formed.
` UNDERSET(ethylbromide)(C_2H_5Br)+KOH_(alc.) rarr KBR +H_2O+underset(ETHYLENE)(C_2H_4)`
Discussion
5305.

Which of the following molecules has both p pi-p piand p pi-d pi bonds

Answer»

`XeO_(2)F_(2)`
`SO_(2)Cl_(2)`
`SO_(3)`
`XeO_(3)`

SOLUTION :
Discussion
5306.

What is sorptio ? Give an example,

Answer»
Discussion
5307.

What would be the product of following reaction?

Answer»




NONE of these

Answer :B
Discussion
5308.

What is the shape of XeF_(6) molecule ?

Answer»

SOLUTION :DISTORTED OCTAHEDRAL.
Discussion
5309.

Which pair of electrolytes could not be distinguished by the products of electrolysis using inert electrodes.

Answer»

1M `CuSO_(4)` solution, `1M CuCl_(2)` solution
1M KCl solution, 1M KI solution
1 M `AgNO_(3)` solution `1M Cu(NO_(3))` solution
1M `CuBr_(2)` solution `1M CuSO_(4)` solution.

Solution :(A) `CuSO_(4)rarrCu+O_(2):CuCl_(2)rarrCu+I_(2)`
(B) `KClrarrH_(2)+Cl_(2):KIrarrH_(2)+I_(2)`
(C) `AgNO_(3)rarrAG+O_(2),:NaClrarrH_(2)+Cl_(2)`
(D) `KClrarrH_(2)+Cl_(2):NaClrarrH_(2)+Cl_(2)`
(E) `CuBrrarrCu+Br_(2):CuSO_(4)rarrCu+O_(2)`
Thus KCl and NaCl solution give the same products at ANODE and CATHODE.
Discussion
5310.

ZnS + 3O_(2) overset(Delta)rarr 2ZnO + 2SO_(2) uarr. The above equation is an example for ________.

Answer»

calcination
reduction
roasting
leaching

Answer :C
Discussion
5311.

Yellow phosphorus in the molecular state exists as :

Answer»

<P>`P_4`
`P_5`
`P_9`
`P_(10)`

ANSWER :A
Discussion
5312.

What is the minimum oxidation state of a d-block element ?

Answer»

SOLUTION :The MINIMUM oxidation STATE of a d-block element is the NUMBER of electrons present in the ns-orbital.
Discussion
5313.

Which law gives a quantitative relation between the pressure and solubility of a gas ?

Answer»

SOLUTION :Henry.s
Discussion
5314.

When CS_(2) layer containing both Br_(2) and I_(2) (2:1) is shaken with excess of chlorine (Cl_(2)) water, the violet colour due to l_(2) disappears and a pale yellow colour appears in the solution.The disappearance of violet colour and appearance of pale yellow colour is due to the formation of:

Answer»

`I_(3)^(-)` and `Br_(2)` respectively<BR>`HIO_(3)` and `BrCl` resectively
`ICI` and `BrCl` respectively
`I^(-)` and `Br^(-)` respectively

Solution :`5Cl_(2)+l_(2)+6H_(2)O to 2HIO_(3) ("COLOURLESS") +10HCl`
`Br_(2)+Cl_(2) hArr 2BrCl` (pale YELLOW)
Discussion
5315.

Which is highly soluble in water:

Answer»

Methanal
Propanal
Propanone
Butanone

Answer :A
Discussion
5316.

Which of the following exists as a zwitterion?

Answer»

p-Aminophenol
Salicylic ACID
Sulphonilic acid
p-Aminoacetophenone

Solution :Sulphonilic acid EXISTS as ZWITTERION.
Discussion
5317.

Which of the following is less reactive than benzene towards electrophilic substitution reaction ?

Answer»

NITROBENZENE
ANILINE
BROMOBENZENE
CHLOROBENZENE

ANSWER :A
Discussion
5318.

The solubility of H_2Sgas in water at STP.195m .Calculate its Henry's law constant at STP

Answer»

SOLUTION :SOLUBILITY of `H_2S` at STP = 0.195m,
i.e., 0.195 moles of `H_2S` is DISSOLVED in 1000g (1kg) of water
Number of moles in 1000g `H_2O` = 1000/18 = 55.55
`therefore` Mole fraction of `H_2S` inthe solution (x) =` 0.195/(0.195+55.55)` = `0.195/55.745`= 0.0035
STP pressure =1 BAR
Applying Henry.s law,`P_(H_2S)= K_H xx x_(H_2S) therefore K_H of H_2S = P_(H_2S)/x_(H2S)` = 1 bar/0.0035 = 285.7 bar
Discussion
5319.

Which reagent is generally used for the separation of 1^(@), 2^(@) " and " 3^(@) amines ?

Answer»

`AcCl`
Benzene sulphonyl CHLORIDE `(BSC)`
`(COOC_(2)H_(5))_(2)` as WELL as BSC
`HNO_(2)`

Solution : Benzene sulphonyl chloride This is called as Hinsber'g reagent.
Discussion
5320.

Which of the following halides will be most reactive in S_(N)1 reaction and S_(N)2 reactions, respectively

Answer»

(I), (II)
(II), (I)
(I), (III)
(III), (I)

ANSWER :D
Discussion
5321.

Which does not disproportionate when reacts with NaOH?

Answer»

<P>`Cl_(2)`<BR>`P_(4)`
 `Br_(2)`
 `F_(2)`

Answer :D
Discussion
5322.

The thermal stability order for group 14 halides is :

Answer»

`CX_4 gtSiX_4gtGeX_4gtSnX_4`
`SnX_4gtGeX_4gtSiX_4gtCX_4`
`SiX_4gtCX_4gtGeX_4gtSnX_4`
NONE of the above

Answer :A
Discussion
5323.

What is the effect of denaturation on the structure of proteins?

Answer»

Solution :During denaturation, secondary and tertiary structures of PROTEINS are DESTROYED but primary structure remains unchanged. As a result of denaturation, the GLOBULAR proteins (soluble in `H_(2)O`) are converted into fibrous proteins (insoluble in `H_(2)O`) and their biological activity in LOST.
Discussion
5324.

The suffix for alcohols, aldehydes and ketones, according to IUPAC system are respectively :

Answer»

`-"ane",-"ald,"-"keto"`
`-"al,"-"al,"-"Ket"`
`-"ol",-"al",-"ONE"`
`-"ol",-"DE",-"ne"`.

ANSWER :C
Discussion
5325.

Which halogen has the highest heat of hydration:

Answer»

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

ANSWER :D
Discussion
5326.

When graphite is heated with vapour of M (metals like K,Pb,Cs) it forms C_(x)M. The value of x is

Answer»


Solution :8C (Graphite) +K `overset(573K) to C_(8)K`.
VALUE of X=8
Discussion
5327.

Write the molecular formula and structural formula for the following molecules. (a) Nitric acid (b) dinitrogen pentoxide (c ) phosphoric acid (d) phosphine

Answer»

SOLUTION :
Discussion
5328.

Which of the following relations for expressing volume of a sample of NOT correct?

Answer»

`1L = 10^(3) ML`
`1 dm^(3) = 1 L `
` 1L = 10^(3) m^(3)`
` 1L = 10^(3) cm^(3)`

Solution :`1L =10^(-3)m^(3)=10^(3)cm^(3)=1dm^(3)=10^(3)ml`
Discussion
5329.

What is the second step in Cannizaro reaction mechanism?

Answer»

Attack of OH on CARBONYL carbon
Acid BASE reaction
Protonation of carbonyl oxygen
HYDRIDE ION transfer

Solution :Hydride ion transfer
Discussion
5330.

Which of the following metals) can be obtained by electrolysis of their aqueous salt solutions

Answer»

Ag
Mg
Cu
Zn

Solution :Electropositive metals cannot obtained by the electrolysis of their AQUEOUS SALT SOLUTIONS, i.e., salt slution of NA, k, Mg.
Discussion
5331.

Which concentration plot is linear for a first order reaction?

Answer»

[A] versus TIME
In [A] versus time
log [A] versus `1/"time"`
SQUARE root of [A] versus time.

SOLUTION :b) it is the correct ANSWER
Discussion
5332.

Which of the followingg are correct?

Answer»

Electrolysis of dilute NaOH solution given `H_(2)` at CATHODE and `O_(2)` at anode.
Electrolysis of sulphuric acid (dilute or concentrated) GIVES `H_(2)` at cathode and `O_(2)` at anode.
Electrolysis of aqueous KF solution gives fluorine at the anode
oxidation of copper anode occurs in the electrolysis of aqueous copper sulphate solution using solution copper electrodes.

Solution :(B) is wrong because electrolysis of concentrated `H_(2)SO_(4)` does not GIVE `O_(2)` at the anode. (c) is wrong because electrolysis of aqueous KF solution gives `O_(2)` at the anode and not `F_(2)`.
Discussion
5333.

Which of the following is neutral oxide?

Answer»

`N_(2)O_(4)`
`N_(2)O_(5)`
NO
`N_(2)O_(3)`

Answer :C
Discussion
5334.

Which is the correct increasing order of boiling points of the following compounds ?1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane

Answer»

BUTANE `LT` 1-Chlorobutane `lt` 1-Bromobutane `lt` 1-IODOBUTANE
1-Iodobutane `lt` 1-Bromobutane `lt` 1-Chlorobutane `lt` Butane
Butane `lt` 1-Iodobutane `lt` 1-Bromobutane `lt` 1-Chlorobutane
Butane `lt` 1-Chlorobutane `lt` 1- Iodobutane `lt` 1-Bromobutane

ANSWER :A
Discussion
5335.

The standard state Gibbs energies of formation of C (graphite) and C (diamond) at T=298 K are Delta_(f)G^(@)[C("graphite")]=0"kJ mol"^(-1) Delta_(f)G^(@)[C("diamond")]=2.9"kJ mol"^(-1) The standard state means that the pressure should be 1 bar and substance should be pure at a given temperature. The conversion of graphite to dimond reduces its volume by 2xx10^(-6) m^(3) mol^(-1) . If C (graphite) is converted to C isothermally at T=298 K, the pressure at which C (graphite) is in equilibrium with C (diamond) is (1J=1 kg m^(2)s^(-2),1 Pa=1kg m^(-1)s^(-2), 1bar=10^(5) Pa)

Answer»

`58001` BAR
`1450` bar
`14501` bar
`29001` bar

Solution :`DeltaG=VDeltap-SDeltaT,AsDeltaT=0,DeltaG=VDeltap`
`:.G_(gr)-G_(gr)^(@)=V_(gr)DeltaP "and"G_(dim)-G_(dim)^(@)=V_(dim)DeltaP`
`:.(V_(dim)-V_(gr))DeltaP=(G_(dim)-G_(gr))+(G_(gr)^(@)-G_(dim)^(@))`
at eqb. `G_(dim)=G_(gr)`
`:.(V_(dim)-V_(gr))DeltaP=G_(dim)^(@)-G_(gr)^(@)=2.9xx10^(3)`
CALCULATE `Deltap,i.e.,p-p_(0)`,"then p"i.e.,(p_(0)=1).`
Discussion
5336.

What is the difference between haxachlorobenzene and benzene hexachloride?

Answer»


Iodide ion `(I^(-))` is a stronger nucleophile than BROMIDE ion `(Br^(-))` because iodine is less electronegative and therefore, electron pair can be more readily released by `I^(-)` ion than by `Br^(-)` ion.

Solution :
Hexachlorobenzene is a substituted compound obtained by replacing all the hydrogen atoms in BENZENE with chlorine atoms. On the other hand, benzene hexachloride is an addition compound formed when three MOLES of chloride ADD on one mole of benzene under reaction conditions.Out of `Br^(-) and I^(-)` ions, which is a stronger nulcleophile?
Discussion
5337.

Which of the following is an example of intensive property?

Answer»

Enthalpy
Energy
Mass of substance
Surface tension

Answer :D
Discussion
5338.

What is the name of the alloy obtained by the combination of 95% lanthanoid metal and 5% iron and traces of S, C, Ca and Al ?

Answer»

SOLUTION :Misch METAL
Discussion
5339.

Which among the following has same equivalent and molar conductance

Answer»

`H_(2)SO_(4)`
`CH_(3)COOH`
`NACL`
`Na_(2)SO_(4)`

Answer :C
Discussion
5340.

Which of the following are used as chlorinating agents in organic synthesis of compounds ? (Like acid converted to acid chloride)

Answer»

`SOCl_(2)`
`SO_(2)Cl_(2)`
`PCl_(3)`
`PCl_(5)`

Answer :A::B::C::D
Discussion
5341.

Which of the following will give yellow precipitate on shaking with an aqueous NaOH followed by adification with dilute HNO_(3) and addition of AgNO_(3) solution.?

Answer»




NONE of these

Solution :
Discussion
5342.

Though fructose is a keto hexose, it is a reducing sugar. Why?

Answer»

Solution :In AQUEOUS basic solution like Fehling.s solution or Tollen.s reagent, fructose undergoes Lobry de Bruyn van Ekenstein rearrangement. The REACTION leads to form a MIXTURE of D-glucose, D-mannose and D-fructose. Hence fructose acts as REDUCING SUGAR
Discussion
5343.

Which of the following statements is INCORRECT for pair of elements Zr-Hf?

Answer»

Both possess same NUMBER of valence electrons.
Both have identcial atomic SIZES.
Both have almost identical ionic RADII.
Both of these belong to same period of periodic table.

Solution :These are chemical twins
Zr belongs to 5th period and 4TH group.
Hf belongs to 6th period and 4th group.
Discussion
5344.

Which of the following act as catalyst in the oxidation of alcohol into acetic acid?

Answer»

pepsin
diastase
micoderma
urease

Solution :micoderma
Discussion
5345.

Which of the following ether is in liquid state at room temperature ?

Answer»

`CH_(3)-O-CH_(3)`
`C_(2)H_(5)O-C_(2)H_(5)`
`CH_(3)-OC_(2)H_(5)`
None of these

Solution :At room TEMP. diethyl ETHER is in gaseous state and hence during contineous etherification it is contineousely PASSED through condensor and OBTAINED into liquid state.
Discussion
5346.

Which of the following is pseudo halogen compounds

Answer»

`C_(2)N_(2)`
`BrF_(5)`
`ICN`
`HCN`

Solution :`C_(2)N_(2)` is pseudohalogen .
Discussion
5347.

When 0.1 mol CoCl_(3)(NH_(3))_(5) is treated with excess to AgNO_(3), 0.2 mol AgCl are obtained. The conductivity of solution will solutions of following complex entities :

Answer»

1 : 3 electrolyte
1 : 2 electrolyte
1 : 1 electrolyte
3 : 1 electrolyte

Solution :`[Co(NH_(3))_(5)CL]Cl_(2)implies1:2` electrolyte
Discussion
5348.

What happens when acetone reacts with : Sodium bisulphite

Answer»

SOLUTION :
Discussion
5349.

Towards litums, Aniline is

Answer»

ACIDIC 
Basic 
Neutral 
BLEACHING agent 

ANSWER :C
Discussion
5350.

Whichstatementinincorrectformetal- ligandcomplex ?

Answer»

Largerthe valueif ionisationpotentialofcentralmetal, strongeris THEBOND
Greaterthedipolemomentof LIGAND, morestableismetalligandbond
Greaterthe CHARGEON ligand , morestrongeris thebond
LARGER theligand, lessstableis themetal-ligandcomplex .

SOLUTION :Largerligandsformmorestablemetal- ligandcomplex .
Discussion