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651.

Vapour pressure of a solution containing solution of a sparingly soluble salt A_(2)B_(3) is 31.8 mm of Hg at 40^(circ)C. IF vapour pressure of pure water is 31.9 mm of Hg at 40^(circ) C, calculate K_(SP) of A_(2)B_(3) at 40^(circ)C.

Answer»


ANSWER :`5.672 XX 10^(-6)` ;
Discussion
652.

Which order is improper for acidic strength ?

Answer»

`Cl_(3)C"C"OOHgtCl_(2)CHCOOHgtClCH_(2)COOH`
`CH_(3)-CH-underset(CL)underset(|)CH-COOHgtCH_(3)-underset(Cl)underset(|)CH-CH_(2)-COOHgtunderset(Cl)underset(|)CH_(2)-CH_(2)-CH_(2)-CH_(2)-COOH`

`HCOOHgtCH_(3)COOHgtC_(6)H_(5)COOH`

Solution :(d) The correct order is :
`{:(HCOOHgtC_(6)H_(5)COOHgtCH_(3)COOH),((Ka)17.7xx10^(-5)" "6.3xx10^(-5)" "1.75xx10^(-5)):}`
Discussion
653.

which one of the following statement (s) is/are true for threo-butene-2,3-diol regarding their population of different conformers?

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The most POPULATED conformer will have the HYDROXYL groups of the gauche position.
The most populated conformer will have the hydroxyl groups at the anti position.
All STAGGERED CONFORMATIONS will be equally populated
Relative population of DIFFERENT conformers is not predictable.

Answer :A
Discussion
654.

Which is not an oxyacid of chlorine:

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`HCLO`
`HClO_2`
`HClO_3`
`HClO_5`

ANSWER :D
Discussion
655.

Which is steam volatile ?

Answer»

o-nitrophenol
m-nitrophenol
p-nitropnenol
picric acid

Answer :A
Discussion
656.

Which ion has magnetic moment 5.90BM?

Answer»

`MN^(4+)`
`FE^(3+)`
`CO^(2+)`
`Fe^(2+)`

Answer :D
Discussion
657.

The vapour pressure of pure benzene is 640 mm at 298K. A solution of a solute in benzene shows a vapour pressure of 630 mm at the same temperature. Then the mole fraction of the solute is

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0.016
0.18
`0.20`
`0.25`

ANSWER :A
Discussion
658.

When a co-ordination compound CrCl_(3).6H_(2)O is mixed with AgNO_(3), 2 moles of AgCl are precipitated per mole of the compound. Write structural formula of the complex.

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SOLUTION :Struchlral formula : `[CR(H_(2)O)_(5)Cl]Cl_(2).H_(2)O`
Discussion
659.

When a co-ordination compound CrCl_(3).6H_(2)O is mixed with AgNO_(3), 2 moles of AgCl are precipitated per mole of the compound. Write IUPAC name of the complex.

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SOLUTION :Pentaaquachloridochromium(III)CHLORIDE MONOHYDRATE.
Discussion
660.

Which one of the following is not the example of homogeneous catalysis?

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FORMATION of `SO_3` in the chamber process
Formation of `SO_3` in the CONTACT process
Hydrolysis of an ester in presence of ACID
Decomposition of `KClO_3` in presence of `MnO_2`

Answer :B
Discussion
661.

Which of the following is not react with sulphur

Answer»

`F_(2)`<BR>`Cl_(2)
`Br_(2)`
`I_(2)`

ANSWER :D
Discussion
662.

The temperature at which the r.m.s. velocity of gas molecules is doubled than that at 27^(@)C is :

Answer»

`108^(@)`
`927^(@)C`
`327^(@)C`
`54^(@)C`

Solution :`sqrt(( 3RT)/( M)) = 2 sqrt(( 3R xx 300)/(M))`
or `T = 1200K = 927^(@)C`
Discussion
663.

The relative penetrating power of alpha,beta,gamma and neutron (n) follows the order :

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`alphagtbetagtgammagtn`
`ngtgammagtbetagtalpha`
`betagtalphagtngtgamma`
NONE of these.

Solution :`GAMMA` has MAXIMUM PENETRATING POWER.
Discussion
664.

Which relation is/are correct for an aqueous dilute solution of K_3PO_4 if its degree of dissociation is alpha?

Answer»

`(DeltaP)/P^@ = ("Molality" xx 18 xx (1+3alpha))/1000`
`DeltaT_(F(obs))=K_f xx "molality" xx (1+alpha)`
`(DeltaP)/P^@ = (DeltaT_(f(obs))xx18)/(K_f xx 1000)`
`M_w` of `K_3PO_4 = M_(w_(obs))xx(1+3alpha)`

Solution :`{:(K_3PO_4 , to , 3K^(+) +, PO_4^(3-)),((1-alpha),,3alpha,alpha):}`
Total no. of particles = `1-alpha + 3alpha + alpha = 1+ 3alpha`
`(DeltaP)/P^@=x_2=n_2/n_1=(n_2xxM_(w_1)xx1000)/(W_1xx1000)=("Molality" xx M_(w_1))/1000`
For electrolyte , `(DeltaP)/P^@= ("Molality" xx 18)/1000xx(1+3alpha)` ...(i)
(`M_(w_1)` = 18 , for `H_2O` )
`DeltaT_(f(obs))=K_fxx"molality"xx(1+3alpha)` ....(ii)
Dividing eq. (i) by (ii)
`(DeltaP)/P^@=(DeltaT_(f(obs))xx18)/(K_f xx 1000)`
`i=(1+3alpha)="Normal molecular weight"/"Observed molecular weight"`
Therefore, molecular weight of `K_3PO_4=M_(w(obs))xx(1+3alpha)`
Discussion
665.

Which of the following is used in Nylon-6 ?

Answer»

ADIPIC ACID
Caprolectum
Ethyne
Ethene

Solution :Caprolectum
Discussion
666.

Write tests to distinguish between (i) Phenol and carboxylic acid (ii) Formic acid and acetic acid

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Solution :(i) `NaHCO_(3)` test , (II) TOLLEN's reagent test.
Discussion
667.

Write the name of reducing agent to obtain iron from Fe_(2)O_(3) at high temperature.

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Solution :Coke is used as a reducing agent to OBTAIN iron from `Fe_(2)O_(3)` at high temperature.
`Fe_(2)O_(3) +3C to 3CO +2Fe`.
Discussion
668.

Which one of the following is used as painkiller?

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Iodoform
chloropicrin
MORPHINE
coffeine

Solution :morphine
Discussion
669.

Write the hybridisation and magnetic behaviour of the complex [Ni(CO)_(4)]. [At. no. of Ni = 28)

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SOLUTION : Under the influence of ligands
`sp^(3)` HYBRIDISATION
THUS the type of hybridisation of orbitals of the central metal will be `sp^(3)`.
As there are no unpaired electrons in the metal ATOM, the complex `[Ni(CO)_(4)]` is diamagnetic.
Discussion
670.

The sterile gauze (or cotton) used in medicine is obtained by oxidising cellulose with

Answer»

NITROGEN
`KMnO_(4)`
Nitrogen dioxide
potassium chlorate

ANSWER :C
Discussion
671.

Write the products of the following reaction: (i). CH_(3)-underset(Cl)underset(|)(C)H-CH_(3)overset(Na//Ether)to? (ii). CH_(3)CH_(2)-B r overset(AgCN)to?

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SOLUTION :(i). `underset("2,3-Dimethylbutane")(CH_(3)-underset(CH_(3))underset(|)(C)H-underset(CH_(3))underset(|)(C)H-CH_(3))`
(ii).`underset("Elhyl isocyanide")(CH_(3)-CH_(2)-N underset(RARR)(=)C)`
Discussion
672.

What is the product of the following reaction?

Answer»




ANSWER :A
Discussion
673.

What are t_(2g) and e_(g) orbitals ?

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Solution :In a free TRANSITION metal ion, the five d-orbital are degenerate. When it forms a complex, the degeneracy is split. In an octahedral field, THREE d-orbitals having LOWER energy are CALLED `t_(2g)` orbitals and the remaining two d-orbitals of higher are called `e_(G)` orbtials.
Discussion
674.

Which shows only -1 oxidation state?

Answer»

I
F
Cl
Br.

Answer :B
Discussion
675.

What are fillers and what role do they play in soap ?

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SOLUTION :Some substances are ADDED to soap to make it more useful for PARTICULAR applications. For example, sodium rosinate is added to LAUNDRY soap to increase its foaming CAPACITY. Glycerol is added in shaving soaps to prevent it from drying.
Discussion
676.

Which of the following compound is not an antacid.

Answer»

Aluminimum hydroxide
PHENELZINE
Cimetidine
RANITIDINE

ANSWER :B
Discussion
677.

Which of the following structures represents the peptide chain ?

Answer»

`-overset(H)overset(|)(N)-underset(O)underset(||)(C)-underset(H)underset(|)(N)-overset(|)underset(|)(C)-NH-overset(O)overset(||)(C)-NH-`
`-overset(H)overset(|)(N)-underset(O)underset(||)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-`
`-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-`
`-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-underset(H)underset(|)(N)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-overset(H)overset(|)(N)-underset(O)underset(||)(C)-overset(|)underset(|)(C)-overset(|)underset(|)(C)-`

SOLUTION :The peptide chain contains the sequence
`-overset(H)overset(|)(N)-overset(|)underset(|)(C)-underset(O)underset(||)(C)-overset(H)overset(|)(N)-overset(|)underset(|)(C)-overset(O)overset(||)(C)-`
Thus , option (c) is correct.
Discussion
678.

Total number of functional groups present in following compound:

Answer»

SOLUTION :FUNCTIONAL group `-overset(O)overset(||)C-O` (Ester)
`-underset(O)underset(||)C-` (KETONE)
`-N-`(AMINE)
`-OH`
`-underset(O)underset(||)C-OH`
Discussion
679.

Tube A +HNO_2 to "blue solution" overset(NaOH)to"red solution." "Tube B"+HNO_2 to"No reaction". "Tube C "+HNO_2 to "blue solution "overset(NaOH)toNo reaction. Tube A, B and C contains_____________.

Answer»

PRIMARY, SECONDARY and TERTIARY NITROALKANES respectively
primary, tertiary andsecondary nitroalkanes respectively
secondary, tertiary and primary nitroalkanes respectively
tertiary, secondary and primary nitroalkanes respectively

Answer :B
Discussion
680.

What will be the charge on colloidal solutions in the following cases ? Give reasons for the origin of charge

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Solution :(i) `I^(-)` ions are adsorbed on AgI, forming NEGATIVELY charged colloid .
(ii) `AG^(+)` ions are adsorbed on AGL , forming positively charged colloid.
REASON for origin of charge is the perferential adsorption of common ions of the ELECTROLYTE present in excess.
Discussion
681.

What is phosgene?

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SOLUTION :When carbon monoxide is TREATED with chlorine in presence of light or CHARCOAL, it forms a POISONOUS gas carbonyl chloride, when is also known as PHOSGENE.
`CO+Cl_(2)+underset(("Phosgene"))(COCl_(2))`
Discussion
682.

What is theeffectof denaturationon the structureof proteins ?

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Solution :DURINGTHE denaturationprocess`2^@` and `3^@` structureof protein are destroyedby `1^(@)`structureremains INTACT . For EXAMPLE:curdlingof milk .
Discussion
683.

What is the coordination number of aluminium in mineral cryolite ?

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SOLUTION :CRYOLITE is `3NaF. AIF_3` or `Na_3[AIF_6]`. It gives that COORDINATION number of ALUMINIUM is six.It can expand its covalency by using empty d-orbitals.
Discussion
684.

Which one of the following metals can be extracted by aluminothermit process

Answer»

Manganese
Iron
Chromium
MAGNESIUM

Solution :In aluminothermite process AL is reducing agent. It reduces oxides of LESS EP metal oxides into METALS like Fe, Cr Mn etc.
`{:(Cr_(2)O_(3)+2Al to 2Cr+Al_(2)O_(3)+"heat"),(Fe_(2)O_(3)+2Al to 2Fe+Al_(2)O_(3)+"heat"),(3Mn_(3)O_(4)+8Al to 8Mn+Al_(2)O_(3)+"heat"):}`
Discussion
685.

Which of the following is correct distance of edge in crystal unit in ZnS ?

Answer»

`a = B NEC `
`a = b = C`
`a NE b = c`
`a ne b ne c`

ANSWER :B
Discussion
686.

Zero magnetic moment will be shown by the compound

Answer»

`[Cr(NH_(3))_(6)]^(3+)`
`[Ag(CN)_(2)]^(-1)`
`[FE(CN)_(6)]^(3-)`
`[CoF_(6)]^(3-)`

Answer :A::B::C
Discussion
687.

Which of the following name is impossible :

Answer»

Potassium tetrafluoridoxido chromate (VI)
Barium tetrafluoridochromate (II)
DICHLOROBIS (UREA) copper (II)
All the impossible

Solution :(i) `K[CrF_(4)O]`oxidation state of CR is +6 not possible
Discussion
688.

To neutralise completely 20 mL ofO. I M aqueous solution of phosphorous acid (H_(3)PO_(3)), the value of 0.1 M aqueous KOH solution required is

Answer»

40 ML
20 mL
10 mL
60 mL

Solution :`N _(1) V_(1) =N_(2) V_(2) (H_(3) PO_(3)` is DIBASIC ` therefore M =2N `)
`20xx0.2 =0.1 xxV`
`therefore V = 40 ml`
Discussion
689.

When lead accumulator is charged it behaves as:

Answer»

an electrolytic cell
a GALVANIC cell
a DANIEL cell
none of these

Answer :A
Discussion
690.

What is deemulsification? Explain about the various techniques of deemulsification.

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Solution :Emulsion can be separated into two SEPARATE layers. This process is CALLED Deemulsification.
Various deemulsification techniques are GIVEN below:
(a) Distilling of one component
(b) Adding an ELECTROLYTE to destroy the charge.
(c) Destroying the emulsifier using chemical methods.
(d) Using solvent extraction to remove one component.
(e) By freezing one of the components.
(f) By APPLYING centrifugal force.
(g) Adding dehydrating agents for water in oil type.
(h) Using ultrasonic waves.
(i) Heating at high pressures.
Discussion
691.

Which of the following is the common oxidation state for Lanthanoids ?

Answer»

4
2
1
3

Answer :D
Discussion
692.

Which of the following oxide is reduced by an acceptance of electrons ?

Answer»

`Fe_2O_3`
`Al_2O_3`
`ZnO`
`PbO`

SOLUTION :`Al_2O_3` is reduced to aluminium by ELECTROLYSIS. i.e. acceptance of ELECTRONS.
Discussion
693.

Which among the given compounds will give thermal elimination ?

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`CH_3-CH_2-Br`
`CH_3-CH_2-OH`
`{:(""OCOCH_3),(""|),(CH_3-CH_2-CH-CH_3):}`
All of these

Answer :C
Discussion
694.

The tris (Ethylene diamine) Cobalt (III) cation [Co(en)_(3)]^(3+) can have

Answer»

Three stereo isomers, all chiral and optically active
TWO chiral stereo isomers (ENANTIOMERS)
Three stereo isomers all chiral
Two stereo isomers both achiral

Solution :`[M(A A)_(3)]^(npm)` FORMULA will have two optical isomers.
Discussion
695.

The value of heat of formation of SiO_(2) and MgO are 48.24 and 34.7 kJ respectively. The heat of reaction : 2Mg + SiO_(2) rarr 2MgO + Si is :

Answer»

21.16 kJ
`-21.16 kJ`
13.62 kJ
`-13.62 kJ`

SOLUTION :`Delta H = 2 Delta H_(F) (MgO) + Delta H_(f) (Si) - 2 Delta H_(f) (Mg) - Delta H_(f) (SiO_(2))`
`= 2 xx 34.7 + 0 - 2 xx 0 - 48.24`
= 21.16
Discussion
696.

What are d-block elements ?

Answer»

Solution :The d-block elements are defined as elements WHOSE ATOMS in the ground state or their ions in COMMON OXIDATION state have partially FILLED d-subshell
Discussion
697.

Which of the following is/are paramagnetic ?

Answer»

`[Fe(CN)_(6)]^(4-)`
`[Ni(CO)_(4)]`
`[Ni(CN)_(4)]^(2-)`
`[CoF_(6)]^(3-)`

Solution :`[CoF_(6)]^(3-) implies SP^(3)d^(2),d^(6)` CONFIG.
Discussion
698.

Which of the following compounds will exhibits geometrical isomerism?

Answer»

1-Phenyl-2-butene
3-Phenyl-1-butene
2-Phenyl-1-butene
1, 1-Diphenyl-1-propane

ANSWER :A
Discussion
699.

Which one of the phrases would be incorrect to use?

Answer»

A MOLE of an ELEMENT
A mole of a COMPOUND
An ATOM of an element
An atom of a compound

ANSWER :D
Discussion
700.

What is Deltan for combustion of 1 mole of benzene, when both the reactants and the products are gas at 298 K

Answer»

0
`3//2`
`-3//2`
`1//2`

Solution :`C_(6)H_(6(G))+(15)/(2)O_(2(g))rarr6CO_(2(g))+3H_(2)O_((g))`
`Deltan=6+3-1-(15)/(2)=+(1)/(2)`.
Discussion