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15651.

Which of the following is non-conducting ?

Answer»

`CoCl_(3).6NH_(3)`
`CoCl_(3).5NH_(3)`
`CoCl_(3).4NH_(3)`
`CoCl_(3).3NH_(3)`

SOLUTION :`(d)[CO(NH_(3))_(3)Cl_(3)]`
Discussion
15652.

The structure of BF_(3) is

Answer»

EQUILATERAL triangle
Pyramidal
Tetrahedral
None

Answer :A
Discussion
15653.

Which structure of proteins remains unaffected by denaturation ?

Answer»

PRIMARY
Secondary
Tertiary
QUATERNARY

SOLUTION :Primary
Discussion
15654.

Which of the following is correct IUPAC name of any compolex compound?

Answer»

Tris(acetylacetonato)iron(III)chloride
Heachloroplatinum(IV)tetraammine dicyano platinate(IV)
Ammine bromochloro methylamine PLATINUM(II)
cis-DICHLORO (ETHYLENEDIAMINE) platinum (II)

Solution :Correct name of (a): tris(acetylacetonato)iron(III)
Correct name of (b): Tetraammine dicyanoplatinum (IV) hexachloroplatinate(IV)
Correact of (d): Dichloro (ethylenediamine) platinum (II)
Discussion
15655.

The strength of H_(2)O_(2) in 11.2 volume solutionof H_(2)O_(2) is

Answer»

1.7
5.1
3.4
8.5

Solution :11.2 volume solution menas that 1 L thissolution liberates 11.2 of `O_(2)` at NTP
`2H_(2)O_(2)rarr2H_(2)O+O_(2)`
22.4 L of `O_(2)` at NTP is PRODUCED from `H_(2)O_(2)`
`=(68)/(22.4)xx11.2=34 G`
strenght =34 g/L
Discussion
15656.

Which of the following pair is having planar structure

Answer»

`SF_(4),XeF_(4)`
`H_(3)O^(+),SO_(2)`
`BF_(3),XeOF_(2)`
`XeF_(4),NO_(3)^(-)`

Answer :D
Discussion
15657.

To remove the acidic impurity, the flux that can be used is

Answer»

`SiO_(2)`
CaO
NaCl
CuO

Answer :B
Discussion
15658.

Which of the following is represented by sols

Answer»

ADSORPTION 
Tyndal EFFECT 
Flocculation 
PARAMAGNETISM 

Solution :Sols shows tyndal effect : Flocculation : In sols adsorption takes place
Discussion
15659.

The substance that sublimes on heating is :

Answer»

`MgCl_2`
AGCL
`HgCl_2`
NaCl

Answer :C
Discussion
15660.

What is the percentage of lanthanoid metal in mischmetall ?

Answer»

`90%`
`20%`
`5 %`
`95 %`

ANSWER :D
Discussion
15661.

The vapour pressure of a solution is proportional to:

Answer»

MOLE FRACTION of SOLUTE
1/(mole fraction of solute)
Mole fraction of solvent
None

Answer :C
Discussion
15662.

Which of the following is aromatic

Answer»




SOLUTION :HUCKLES RULE
Discussion
15663.

Which of the following contains atleast one lone pair in all of its halides ?

Answer»

Cl
N
Se
Xe

Answer :D
Discussion
15664.

Which of the following pairs show coordination isomerism?

Answer»

`[Co(NH_(3))_(6)][Cr(CN)_(6)] and [Cr(NH_(3))_(6)][Co(CN)_(6)]`
`[Co(NH_(3))_(3)(H_(2)O)_(2)Cl]Br_(2) and [Co(NH_(3))_(3)(H_(2)O)Cl*Br]Br*H_(2)O`
`[Pt(NH_(3))_(4)Cl_(2)]Br_(2) and [Pt(NH_(3))_(3)B_(2)]Cl_(2)`
`[Co(NH_(3))_(3)(CN)_(3)][Co(NH_(3))_(3)(CN)_(3)]`

Solution :COORDINATION isomerism OCCURS when both cation and ANION are complex, CAUSED DUE to interchange of ligands between two complex ions of the same complex.
Discussion
15665.

What are the types of colloids based on dispersion medium?

Answer»

Solution : (i) If the DISPERSION medium CONSIDERED as water, then the COLLOIDS are referred as hydrosols (or) aquasols.
(ii) If the dispersion medium is an alcohol, the COLLOID is termed as alcosol. and if benzene is the dispersion medium, it is called benzosol.
Discussion
15666.

Value of E_(H_(2)O//H_(2)(1atm)Pt) at 298 K would

Answer»

`-0.207V`
`+0.207V`
`-0.414V`
`+0.414V`

Solution :For water at 298K,`[H^(+)]=10^(-7)M`
Reduction reaction is: `H^(+)+e^(-)to(1)/(2)H_(2)`
`thereforeE=-(RT)/(F)"LN"(p_(H_(2))^(1//2))/([H^(+)])=-0.0591"LOG"(p_(H_(2))^(1//2))/([H^(+)])`
`=0.0591"log"(1)/(10^(-7))=-0.4137=-0.414V`
Discussion
15667.

What are amino acids ? Write the correct reaction for formation of peptide bond between amino acids.

Answer»

Solution :Amino acids are bifunctional COMPOUNDS containing a carboxylic acid GROUP and an amino on `alpha`- CARBON.
Discussion
15668.

Write the important structural and functional difference between DNA and RNA.

Answer»

SOLUTION :
Discussion
15669.

What is adsorption, adsorbate, adsorbent and desorption ? Explain with appropriate examples.

Answer»

Solution :Adsorption : The accumulation of molecular species at the surface rather than in the bulk of a solid or LIQUID is termed adsorption.
Adsorbate : The molecular species or substance, which concentrates or accumulates at the surface is termed adsorbate. e.g. PARTICLES of colour.
Adsorbent: The material on the surface of which the adsorption takes place is called adsorbent. eg. charcoal, silica gel, alumina gel, clay, colloids, METALS in finely divided state.
Desorption : The process of removing an adsorbed substance from a surface on which it is adsorbed is called desorption.
It is clear from the above examples that solid surfaces can hold the gas or liquid molecules by virtue of adsorption.
Some examples of adsorption process are as under :
(i) If a gas like `O_(2), H_(2), CO, Cl_(2), NH_(3) or SO_(2)`is taken in a closed vessel containing powdered charcoal it is OBSERVED that the pressure of the gas in the enclosed vessel decreases. The gas molecules concentrate at the surface of the charcoal. I.e., gases are adsorbed at the surface.
(ii) In a solution of an organic dye, say methylene blue, when animal charcoal is added and the solution is well shaken, it is observed that the filtrate turns colourless. The molecules of the dye, thus, accumulate on the surface of charcoal, i.e. are adsorbed.
(iii) Aqueous solution of raw sugar when passed over BEDS of animal charcoal becomes colourless as the colouring substance are adsorbed by the charcoal.
(iv) The air becomes dry in presence of silica gel because the water molecules get adsorbed on the surface of the gel.
Discussion
15670.

Which of the following will give an alkane having same number of carbon atoms on reacting with an alkyl halide ? (A ) RMgX (b) Na + Ether (c ) "LiAIH"_(4) (d) Sn + HCl

Answer»

[A], [C]
[B], [D]
[C], [D]
[A], [D]

ANSWER :C
Discussion
15671.

Which one of the following can be prepared by Gabriel phthalimide synthesis?

Answer»

Aniline
o-Toluidine
4-Bromoaniline
N-Methylethanamine.

Solution :`1^(@)` ALIPHATIC ACID `1^(@)` aralkylamines (but not `1^(@)` AROMATIC amines) can be prepared by GABRIEL phthalimide method. Therefore, benzylamine being a `1^(@)` aralkylamine can be prepared by this method.
Discussion
15672.

Which of the following solids is not an electrical conductor ? (I)Mg_((s)) , (II)TiO_((s)) , (III)I_(2(s)) , (IV)H_2O_((s))

Answer»

(A) only
(B) only
(C) and (D)
(B), (C) and (D)

SOLUTION :Ice and iodine are MOLECULAR solids. Hence, they do not CONDUCT electricity.
Discussion
15673.

Which one of the following is not a sufactant?

Answer»

`CH_3-(CH_2)_15 -underset(CH_3)underset(|)OVERSET(CH_3)overset(|)(N)""^(o+)-CH_3Br `
`CH_3 -(CH_3)_14 -CH_2-NH_2`
`CH_3-(CH_2)_16-CH_2OSO_2-Na^+`
`OHC-(CH_2)_14-CH_2-COO-Na^+`

SOLUTION :Molecule is simply amlne in mature.
Discussion
15674.

Which of the following can not act as an adsorbent?

Answer»

SILICA GEL
Clay
Oxygen gas
Activated CHARCOAL

ANSWER :C
Discussion
15675.

What current is to be passed for 0.25 s for deposition of a certain weight of metal which is equal to its electrochemical equivalent?

Answer»

`4A`
`100A`
`200A`
`2A`

SOLUTION :Electrochemical equivalent is the WEIGHT deposited by 1 coulomb.
`Q=Ixxttherefore1=Ixx0.25` or `I=4A`.
Discussion
15676.

The relation DeltaG=DeltaH-TDeltaS was given by

Answer»

BOLTZMANN
FARADAY
Gibbs-Helmholtz
Thomson

Answer :C
Discussion
15677.

Write the formulae for the following coordination compounds : (i) Tetraamminediaquacobalt (III) chloride. (ii) Ptassium tetracyanonickelate (II). (iii) Tris (ethane-1,2-diamine) chromium (III) chloride. (iv) Amminebromidochloridonitrito-N-platinate (II). (v) Dichlorobis (ethane-1,2-diamine)platinum (IV) nitrate. (vi) Iron (III) hexacyanoferrate(II)

Answer»

SOLUTION :`(1)` `[Co(NH_(3))_(4)(H_(2)O)_(2)]Cl_(3)` `(ii)` `K_(2)[Ni(CN)_(4)]``(III)` `[CR(EN)_(3)]Cl_(3)`
`(iv)``[Pt(NH_(3))BrCl(NO_(2))]-``(V)``[PtCl_(2)(en)_(2)](NO_(3))_(2)``(iv)` `[Fe4[Fe(CN)_(6)]_(3)`
Discussion
15678.

Which of the following is/are correct for reactions of first order ?

Answer»

`K=(1)/(t)ln(C_(0)//C_(1))`
`t=(2.303)/(k)log[a//(a-x)]`
`A_(0)=[A]E^(-KT)`
`t_(1//2)=(ln2)//k`

Answer :A::B::D
Discussion
15679.

Which method cannot be used to remove hardness of water ?

Answer»

CLARK's method
By ADDING WASHING SODA
CALGON process
Filtration

Answer :D
Discussion
15680.

Which from of iron is least ducite ?

Answer»

HARD steel
CAST iron
Mild steel
Wrought iron

ANSWER :B
Discussion
15681.

Which metal is most readily corroded in moist air:

Answer»

Copper
Iron
Silver
Nickel

Answer :B
Discussion
15682.

Write the balanced chemical equations involved in the preparation of KMnO_4 from pyrolusite ore (MnO_2). OR Write the balanced ionic equations showing the oxidising action of acidified dichromate [Cr_(2) O_(7)^(2-) ] solution with (i) Iron (II) Ion and (ii) Tin (II) ion.

Answer»

SOLUTION :`2MnO_(2) + 4KOH + O_(2) to 2K_(2) MnO_(4) + 2H_(2) O`
`3MnO_(4)^(2-) + 4H^(+) to 2MnO_(4)^(-) + MnO_(2) +2H_(2) O`
OR
(i) `Cr_(2) O_(7)^(2-) + 14H^(+) +6Fe^(2+) to 2Cr^(3+) +6Fe^(3+) + 7H_(2)O`
(ii) `Cr_(2) O_(7)^(2-) +14H^(+) + 3SN^(2+) to 2Cr^(3+) +7Sn^(4+) +7H_(2) O`
Discussion
15683.

The reagent that has action on glass is

Answer»

Aquar REGIA
HYDROFLUORIC ACID Oleum
Oleum
Funing NITRIC acid

Answer :B
Discussion
15684.

Which of the following is not planar ?

Answer»

`[NI(CN)_(4)]^(2-)`
`[PtCl_(4)]^(2-)`
`[Pd(CN)_(4)]^(2-)`
`[ZN(CN)_(4)]^(2-)`

Solution :`[Zn(CN)_(4)]^(2-)` is TETRAHEDRAL.
Discussion
15685.

Which of the following do not form polyhalide ions ?

Answer»

F
CI
Br
I.

Solution :F cannot form POLYHALIDE IONS. This is DUE to the absence of d-subshell in its VALENCE shell.
Discussion
15686.

When a lead storage battery is charged, it acts as

Answer»

an ELECTROLYTE cell
a galvenic cell
a daniel cell
a and B both

Answer :A
Discussion
15687.

Write the name of the cell which is generally used in inverters. Write the reactions taking place at the anode and the cathode of this cell.

Answer»

SOLUTION :Lead storage battery is USED in INVERTERS.
`{:("Reactions",),("Anode", Pb(s) + SO_(4)^(2-) (AQ) to PbSO_(4)(s) + 2e^(-)),("Cathode",PbO_(2)(s) +SO_(4)^(2-)(aq) + 4H^(+)(aq) + 2e^(-) to PbSO_(4)(s) + 2H_(2)O(l)):}`
Discussion
15688.

Total number of e^(-) that can be accommodated in all orbitals having principal quantum number 3 & azimuthal quantum number 0 is :

Answer»

2
4
6
8

Answer :A
Discussion
15689.

Which of the following is used as a preservative to protect processed food ?

Answer»

SODIUM TRIPOLYPHOSPHATE
Saccharin
Diclofenac sodium
Sod. Metabisulphite

ANSWER :d
Discussion
15690.

Which of the following M^(2+) ions have stable configuration ?

Answer»

`EU^(2+)` only
`Eu^(2+)and Yb ^(2+) ` only
`Yb^(2+)` only
`Yb^(2+)and SM^(2+)` only

Answer :B
Discussion
15691.

Why aniline is weaker base than cyclohexylamine?

Answer»

SOLUTION :The lone PAIR of electrons on nitrogen in aniline is delocalized due to resonance with benzene ring. THUS, electron density on `-NH_2` group in aniline is DECREASED. There is no such effect in cyclohexylamine. Therefore, aniline is a WEAKER base than cyclohexylamine.
Discussion
15692.

What is the molecular formula of the alkane, the 5.6 litre of which weight 11 gat STP

Answer»

`C_6H_14`
`C_4H_10`
`C_3H_8`
`C_2H_6`

SOLUTION :Molecular mass can be OBTAINED by the victor mayer process.
Molecular mass =`"WEIGHT"/"V ml."xx22400=11/5600xx22400`=44
Discussion
15693.

Which molecule \ion among the following cannot act as a ligand in complex compounds?

Answer»

`CH_(4)`<BR>`CN^(-)`
CO
`Br^(-)`

Solution :`CH_(4)` does not have LONE pair.
Discussion
15694.

The solution containing 4.0 gm of a polyvinyl chloride polymer in 1 litre of dioxane was found to have an osmotic pressure 6.0xx10^(-4) atmosphere at 300K, the value of R used is 0.082 litre atmosphere "mole"^(-1)K^(-1). The molecular mass of the polymer was found to be

Answer»

`3.0xx10^(2)`
`1.6xx10^(-5)`
`5.6xx10^(4)`
`6.4xx10^(2)`

SOLUTION :`pi V=(w)/(m)RT`
`THEREFORE 6xx10^(-4)xx1=(4)/(m)xx0.0821xx300 , m = 1.64xx10^(5)`
Discussion
15695.

What happens to the reduction potetial up on dilution of the electrolyte ?

Answer»


ANSWER :
Discussion
15696.

When acidified K_(2)Cr_(2)O_(7) solution is added to Sn^(2+) salts then Sn^(2+) changes to ……

Answer»

Sn
`Sn^(3+)`
`Sn^(4+)`
`Sn^(+)`

SOLUTION :`Cr_(2)O_(7)^(2-) + 3Sn^(2+) + 14H^(+) RARR 3Sn^(4+) + 2Cr^(3+) + 7H_(2)O`
Discussion
15697.

Which one of the following should be subjected to reductive ozonolysis to get only formal dehyde?

Answer»

`CH -= CH`
`CH_3 - CH = CH_2`
`CH_2 = CH_2`
`CH_3 - CH_3`

SOLUTION :`CH_2 = CH_2`
Discussion
15698.

Two organic compounds A and B both containing only carbon and hydrogen, on quantitative analysis gave the same percentage composition by weight : C=(12//13)xx100% , H=(1//13)xx100% A decolourises bromine water but B does not. A and B respectively are

Answer»

`C_(2)H_(2) and C_(6)H_(6)`
`C_(6)H_(6) and C_(2)H_(2)`
`C_(2)H_(4) and C_(2)H_(6)`
`C_(2)H_(2) and C_(2)H_(6)`

Solution :Determine the EMPIRICAL formula of the two compounds
`C : H= ((12)/(13)xx100): ((1)/(13)xx100)=92.3 : 7.7`
`=(92.3)/(12): (7.7)/(1)=7.7 : 7.7 =1 : 1`
`therefore` The empirical formula of the two compounds is CH. Thus the molecular formula of A and B will be the simple multiple of CH, i.e. `C_(2)H_(2),C_(3)H_(3),C_(4)H_(4),C_(6)H_(6)`. etc.
Thus options (c ) and (d ) are discarded. Further since A decolourises bromine water and B does not, A and B should be `C_(2)H_(2)` (acetylene) and `C_(6)H_(6)` (benzene) respectively.
Discussion
15699.

The standard reduction potential for the reaction Sn^(4+)+2e^(-) rarr Sn^(2+) is + 0.15V. Calculate the free energy change of the reaction.

Answer»

Solution :`Sn^(4+)+2E^(-) RARR Sn^(2+) ""E^(@)=0.15V`
Given : N = 2 ELECTRONS
F = 96495 coulombs
Formula : `DeltaG=-nFE^(@)`
Solution : `DELTA G=-2 times 96495 times 0.15`
`""=28.948`
Free energy = -28.948 kJ.
Discussion
15700.

Which of the following is least stable?

Answer»

`NH_4^(+)`
`SbH_4^(+)`
`PH_(4)^(+)`
`AsH_4^(+)`

ANSWER :B
Discussion