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1.

Which of the following compounds is not cleaved by HI even at 525 K ?

Answer»

`C_6H_5OCH_3`
`(PH)_(2)O`
`C_6H_5OC_(3)H_7`

SOLUTION :NA
Discussion
2.

To a 25 mL H_(2)O_(2) solution excess of an acidified solution of potassium iodide was added. The iodine liberated required 20 " mL of " 0.3 N sodium thiosulphate solution Calculate the volume strength of H_(2)O_(2) solution.

Answer»


ANSWER :1334
Discussion
3.

The suggested mechanism of a reaction is : (a) A+BhArrD("fast) "(b)A+Drarr2C("slow")Write the balanced equation of the reaction if its experimentally deduced rate equation is , rate k=[A]^(2)[B] Find the intermediate formed during the course of the reaction . Does the predicted rate law from the mechanism match the experimental rate law ?

Answer»

Solution :The overall reaction is the sum of the reaction (a) and (b) i.e.,`2A+Brarr2C`
Here the intermediate is D.
Now , `A+BhArrD,`
`k=([D])/([A][B]) ("K = RATE constant")""...[1]`
Rate EQUATION of the slowest step
`k=[A][D]=k[A]xxK[A][B]`
`=kK[A]^(2)[B]=k'[A]^(2)[B]`(where , kK=k')
Yes , the predicted rate LAW from the mechanism MATCHES the EXPERIMENTAL rate law.
Discussion
4.

Which of these changes with time for a first-order reaction A Rate of reaction B . Rate constant C . Half-life

Answer»

A only
C only
A and B only
B and C only

ANSWER :a
Discussion
5.

What is the hybridisation of central atom in the product obtained along with hydrofluoric acid when complete hydrolysis of Xenon Hexa Fluoride takes place ?

Answer»

`SP^(3)d^(2)`
`sp^(3)d`
`sp^(3)`
`dsp^(3)`

ANSWER :C
Discussion
6.

Which of the following amino acid forms sulphide bond in polypeptide

Answer»

Arg
Cys
Leu
Gly

Answer :B
Discussion
7.

Which of following pair is Diastereomers:

Answer»




ANSWER :B
Discussion
8.

What is the major product of the following reaction CH_3C-=C-CH_2-CH_3overset("1 mole of " Cl_2)to

Answer»


`CH_3-CH_2-undersetunderset(CL)|oversetoverset(Cl)|C-CH_2CH_3`

`CH_3-undersetunderset(Cl)|oversetoverset(Cl)|C-undersetunderset(Cl)|oversetoverset(Cl)|C-CH_2CH_3`

ANSWER :D
Discussion
9.

Which polymer is used in petrol tank linings ?

Answer»

Buna-S
Buna-N
POLYCHLOROPRENE
NATURAL rubber

Solution :Buna-N
Discussion
10.

Which of the following carbohydrates are branched polymer of glucose ?

Answer»

Amylose
Amylopectin
Cellulose
GLYCOGEN

SOLUTION :(B) and (D)
Amylose and Glycogen are branched POLYMER of D-glucose
Discussion
11.

The stability of ferric ionis due to

Answer»

half-filled d-orbitals
half-filled f-orbitals
compltetly filled d-orbitals
completely filledf-orbitals

Solution :`FE(Z= 26) = 3d^(6)4S^(2)`
`:. Fe^(3+) = 3d^(5)` . Thus`,Fe^(3+)` ION isquite stabledue to half-filledd-orbitals.
Discussion
12.

Two important physical evidences supporting the synergic bonding in non-classical complexes are bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behaviour of a spring and obeys Hook's law. overline(v)=(1)/(2pic)sqrt((k)/(mu))cm^(-1) where, k=force force constant of the bond which is directly proportional to bonnd strength of CO mu=reduced mass of ligand overline(v)=stretching frequency of the CO bond c=velocity of light Q. In which of the following ligand, sigma-bond order does not change during synergic bonding in their respective complexes:

Answer»

CO
`N_(2)`
`CH_(2)=CH_(2)`
`PE t_(3)`

SOLUTION :As `PE t_(3) ` accepts `M overset(PI)toL` back bonding into non-axial d-ORBITAL of phosphorus annd it FORMS `Moverset(pi)toL` bond using its non-bonding molecular orbital.
Discussion
13.

Which type pf 'defect has the presence of cations in the interstitial sites ?

Answer»

FRENKEL defect
Metaldeficiency defect
Schottky defect
Vacancy defect

Answer :A
Discussion
14.

Which of the following reagents can be used to convert primary amides into primary amines containing the same number of carbon atoms?

Answer»

`Br_(2) + NaOH`
`LiAlH_(6)`
both of these
none of these

Solution :Reduction with `LiAlH_(4)` converts `CONH_(2)` of amides to `CH_(2)NH_(2)` giving `1^(@)` amines with same number of carbon atoms as the amide. In contrast, `Br_(2)+NaOH` will BRING about Hofmann bromamide reaction giving `1^(@)` amines with one carbon atom less than the parent amide.
For example,
`RCONH_(2)overset(LiAlH_(4))rarr RCH_(2)NH_(2)`
`RCONH_(2)overset(Br_(2)+NaOH)rarr RNH_(2)`
Discussion
15.

Two important physical evidences supporting the synergic bonding in non-classical complexes are bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behaviour of a spring and obeys Hook's law. overline(v)=(1)/(2pic)sqrt((k)/(mu))cm^(-1) where, k=force force constant of the bond which is directly proportional to bonnd strength of CO mu=reduced mass of ligand overline(v)=stretching frequency of the CO bond c=velocity of light Q. In which of the following complex stretching frequecy for CO ligand is least as well as bond energy of M-C bond is higher.

Answer»

(dien) `Mo(CO)_(3)`
`(Et_(3)P)_(3)Mo(CO)_(3)`
`(F_(3)P)_(3)Mo(CO)_(3)`
`(Cl_(3)P)_(3)Mo(CO)_(3)`

Solution :Dienn is not `pi`-ACID ligannd while `PF_(3),PC l_(3),PE t_(3)` are `pi`-acid ligands, THEREFORE extent of `Mo overset(pi) to CO` back BONDING in (dien) `Mo(CO)_(3)` is maximum in order of DISPERSE incrased electron density at Mo: while in other complexes al ligands participate in `M overset(pi) to I`. back bonding.
Extent of back bonding `alphaMo-CO` bond order `prop(1)/("STRETCHING frequency of CO")`
Discussion
16.

Which carbohydrate is used in silvering of mirrors:

Answer»

Sucrose
Starch
Glucose
Fructose

Answer :B
Discussion
17.

Two important physical evidences supporting the synergic bonding in non-classical complexes are bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behaviour of a spring and obeys Hook's law. overline(v)=(1)/(2pic)sqrt((k)/(mu))cm^(-1) where, k=force force constant of the bond which is directly proportional to bonnd strength of CO mu=reduced mass of ligand overline(v)=stretching frequency of the CO bond c=velocity of light Q. In Mn_(2)(CO)_(10) carbonyl complex, the d-orbital of Mn-atom which can not be involved in synergic bonding betwee Mn and CO ligands:

Answer»

`d_(xz)`
`d_(XY)`
`d_(YZ)`
none of these

Solution :As `d_(xy)` forms `DELTA`-bondin `Mn_(2)(CO)_(10)`
Discussion
18.

Which is the incorrect order of bond angle :-

Answer»

`BF_(3) GT NH_(3) gt H_(2)O`
`BF_(3) LT BCl_(3) lt Bl_(3)`
`H_(2)O gt H_(2)S gt H_(2)Se`
`NO_(2) lt NO_(2) lt NO_(2)`

Solution :Bond angle of `BF_(3)=BBr_(3)=BCl_(3)`
Discussion
19.

The standard heats of formation in Kcal mol^(-1) of NO_(2)(g) and N_(2)O_(4)(g) are 8.0 and 2.0 respectively. The heat of dimerization of NO_(2) in Kcal is. Given : 2NO_(2)(g)hArr N_(2)O_(4)(g)

Answer»

10
`- 6.0`
`- 12.0`
`- 14.0`

Solution :`DeltaH_("REACTION")=DeltaH_(f)^(@)(N_(2)O_(4))-2DeltaH_(f)^(@)(NO_(2))`
`=2-2(8)=-14 kcal`.
Discussion
20.

Which one is the correct statement?

Answer»

(+) TARTARIC ACID and mesotartaric acid are TAUTOMERS
(+) tartaric acid and mesotartaric acid are diasterioisomers.
(+)tartaric acid and (-) tartaric acid are diasterioisomers.
(+) tartaric acid and mesotartaric acid are enantiomers.

Answer :B
Discussion
21.

whichof the following is notamongshortcomings ofbohr'smodal?

Answer»

bohrtheorycouldaccountfor thefinelinesin theatomicspectrum
BOHR theorywasunableto ACCOUNTFOR thespliiting of thespectrallinesin the pressenceof MAGNETICFIELD
bohrtheoryfailedfor HEATOM
It didnot giveinformationaboutenergylevel

ANSWER :D
Discussion
22.

Which of the following is (are) not acceptable freezing point (s) of a one molal aqueous solution ifthe solute undergoes trimerisation to any extent ? (K_(F) of water =1.86K kg "mol"^(-1))

Answer»

`-0.82^(@)C`
`-0.52^(@)C`
`-0.92^(@)`
`-0.42^(@)C`

ANSWER :B::D
Discussion
23.

What is the correct order of melting points of elements of first transition series?

Answer»

`Mn gt CR gt V gt Ti`
`Ti gt V gt Cr gt Mn`
`Cr gt Mn gt V gt Ti`
`Cr gt V gt Ti gt Mn`

Answer :D
Discussion
24.

What is Henderson equation ?

Answer»

Solution :HENDERSON equation is an equation which is used to determine the PH of an acid buffer with the help of the dissociation constant `K_a` oftheweak acid and concentration of the acid and the SALT used.
`pH=pK_a+log.(["Salt")]/(["acid"])`
For a basic buffer `pOH=pK_(b)+log.(["salt"])/(["BASE"])`
Discussion
25.

Which reaction yields the greatest quantity of chlorine from a given quantity of hydrochloric acid

Answer»

WARMING CONC. HCl with `MnO_2`
Warming conc. HCl with `PbO_2`
Warming conc. HCl with `KMnO_4`
TREATING BLEACHING powder with HCl

Answer :D
Discussion
26.

ZnO is colourless at room temperature , while yellow when hot. Why ?

Answer»

SOLUTION :ZnO is colourless at ROOM temperature . When it is heated , it becomes YELLOW in colour . On HEATING , it loses oxygen and thereby forming free `Zn^(2+)` ions . The excess `Zn^(2+)` ions move to interstitial sites and the electrons ALSO occupy the interstitial positions .
Discussion
27.

Which of the following reagent is used for the separation of acetaldehyde from acetophenone.

Answer»

`NH_(2)OH`
`NaOH_(2)`
`NaHSO_(3)`
`C_(6)H_(5)NHNH_(2)`

Solution :N//A
Discussion
28.

Which of the following products is formed by the reaction of manganese (II) ions salt with peroxodisulphate (S_2O_6^(2-))?

Answer»

`Mn_2O_7`
`Mn_3O_4`
`MnO_4^(2-)`
`MNO^(-)`

SOLUTION :`2MN^(2+)+5S_2O_8^(2-)+8H_2Oto2MnO_4^(-)+10SO_4^(2-)+16H^+`
Discussion
29.

Write main differences between the properties

Answer»

SOLUTION :
Discussion
30.

Whichon reactionwith nitrousacidgivesyellowoilyliquid ?

Answer»

ETHYL AMINE
Ethyl METHYLAMINE
Ethyl DIMETHYL amine
Ethyl TRIMETHYL amine

Solution :Secondaryamine
Discussion
31.

Which base is not present in nucleic acids?

Answer»

CYTOSINE
ADENINE
THYMINE
GUANIDINE

ANSWER :D
Discussion
32.

Which of the following alkaline earth metal ion has lowest ionic mobility in aqueous solutions ?

Answer»

`MG^(2+)`
`CA^(2+)`
`SR^(2+)`
`Ba^(2+)`

ANSWER :A
Discussion
33.

What is a ligand ?

Answer»

Solution :A ligand is an ION or a molecule that can donate ONE of more UNSHARED pairs of ELECTRONS towards a metal ion in a COMPLEX.
Discussion
34.

Which of the following does not give flame test?

Answer»

 Na
Sr
 K
Zn

Answer :D
Discussion
35.

Volume of 0.1 M NaOH needed for the neutralisation of 20 ml of 0.05 M oxalic acid is :

Answer»

10 ml
15 ml
20 ml
30 ml

Answer :C
Discussion
36.

Which of the following can give monohydricalcohols ?

Answer»

ALKYL HALIDES
ALDEHYDES
ALKENES
All of these

ANSWER :D
Discussion
37.

Which statements is nottrueamongthe following

Answer»

AMINES are bases.
Amines turn red LITMUS blue.
Trimethylamine is less BASIC than dimethylamine.
Amines YIELD alcohols on AQUEOUS hydrolysis.

Answer :D
Discussion
38.

Which of the following compound does not exist ?

Answer»

`IF_(7)`
`FCl_(5)`
`ClF_(3)`
`IF_(3)`

ANSWER :B
Discussion
39.

Which of the following compound results into benzene nitrile on its dehydration

Answer»

BENZOIC acid
Benzamide
Benzophenone
Benzoyl chloride

Solution :`C_(6)H_(5)CONH_(2) underset(DELTA)overset(P_(2)O_(5))toC_(6)H_(5)CN+H_(2)O`
Discussion
40.

Which of the following solvent will have highest solubility of KCl ?

Answer»

`C_6 H_6(D=0)`
`(CH_3)_2, CO (D=2)`
`CH_3OH (D = 32)`
`C Cl_4` (D=0).

SOLUTION :More is DEC value, more is solubility
Discussion
41.

When a solid changes into liquid, the entropy :

Answer»

increases
remains the same
decreases
becomes ZERO

ANSWER :A
Discussion
42.

Which of the following ions has smallest radii ?

Answer»

`MN^(2+)`
`NI^(2+)`
`Ti^(2+)`
`V^(2+)`

SOLUTION :Ionic radii is general decrease along a period.
Discussion
43.

Which of the following compounds will not gave Lassaigne's test for nitrogen ?

Answer»

`NH_(2)NH_(2)`
`C_(6)H_(5)NHNH_(2)`
`PhN=NPh`
`NH_(2)CONH_(2)`

Solution :In hydrazine, NITROGEN is not directly attached to carbon. Therefore it does not give Lassagine.s test.
Discussion
44.

Whatvolume of10 % (w/v) solutionof Na_(2)CO_(3) will be requiredto neturalise100 mL of HCl solutioncontaining 3.65 g of HCl ?

Answer»


Solution :`10% Na_(2)CO_(3)(w//v)" solution has NORMALITY "=(10//53)/(100)xx1000=1.89 N""("Eq. wt. of "Na_(2)CO_(3)=(106)/(2)=53)`
`"Normality of HCL solution "=(3.65//36.5)/(100)xx1000=1N`
`{:(" "N_(1)V_(1)=N_(2)V_(2)),((Na_(2)CO_(3))(HCl)),(1.89xxV_(1)=1xx100"or"V_(1)=100//1.89=52.9mL):}`
Discussion
45.

Which scientist shows di-helix structure of DNA ?

Answer»

Amil Fischer
WATSON and Crick
DR. Khurana
MICHEL Farade

Solution :Watson and Crick
Discussion
46.

Which of the following factor affect th rate of the reaction

Answer»

VOLUME
PRESSURE
CONC
all the above

ANSWER :C
Discussion
47.

Which is not the pair of enantiomers ?

Answer»




ANSWER :D
Discussion
48.

Which of the following is not one of the products formed in the reaction? 2CH_3 - CH_2 -- CI+ 2Na -rarr^(dry ethanol)

Answer»

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

ANSWER :D
Discussion
49.

What is the packing fraction of ._(26)^(56)Fe (Isotopic mass = 55.92066)

Answer»

`- 14.167`
`173.90`
`-14.187`
`-73.90`

Solution :PACKING fraction `= ("ISOTOPIC mass - Mass NUMBER")/("Mass number") xx 10^(4)`
Discussion
50.

What is a peptide bond ?

Answer»

SOLUTION :The covalent bond `-NH-CO-`FORMED `-NH_2` group of one amino acid and `-COOH` of the other with elimination of a molecule of `H_(2)O` is called a peptide bond.
Discussion