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15001.

Which of the following orders regarding relative stability of free radicals is correct

Answer»

`3^(@) lt 2^(@) lt 1^(@)`
`3^(@) gt 2^(@) gt 1^(@)`
`1^(@) lt 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) lt 1^(@)`

Solution :Due to the increasing no. of hyperconjugative structures FREE RADICAL stabilise as following `3^(@) gt 2^(@) gt 1^(@)`.
Discussion
15002.

When S in the form of S_(g) is heated at 1000K, the initital pressure of 1 atm falls by 30% at equilibrium. This is because of conversion of some S_(g) to S_(2)(g) The K_(p) of the reaction is 0.011 "atm"^(-3)

Answer»

<P>`2.96 "atm"^(3)`
`1.71"atm"^(3)`
`204.8"atm"^(3)`
NONE of these

Solution :`S_(g)(g)hArr4S_(2)(g)`
`t-t_("eqm")1 "atm"-0.3"atm" 1.2"atm"`
`k_(p)=((1.2)^(4))/(0.7)=2.96 "atm"^(3)`
=0.7atm
Discussion
15003.

The two compounds pentaamminesulphatocobalt (III) bromide and pentamminesulphatocobalt (III) chloride represent :

Answer»

LINKAGE isomerism
ionization isomerism
Coordination isomerism
No isomerism

Solution :MOLECULAR FORMULA are DIFFERENT.
Discussion
15004.

What do you understand by the term glycoside linkage ?

Answer»

Solution :The ethereal or OXYGEN linkage through which two monosaccharides are JOINED together by the LOSS of a water molecule to form a molecule of DISACCHARIDE is called the GLYCOSIDIC linkage. The glycosidic linkage in maltose molecule is shown below :
Discussion
15005.

Which ion has the lower magnetic moment ?

Answer»

`Cu^(2+)`
`Ni^(2+)`
`CO^(3+)`
`Fe^(2+)`

Answer :A
Discussion
15006.

Various methods have been employed for protecting iron from rusting. Which of the following is incorrect:

Answer»

Zinc plating is more permament than chrome plating
Zinc protects IRON but gets CORRODED itself
Tin plating is cheap but unrealiable
None

Answer :B
Discussion
15007.

The stainless steel developed in india contains the following special components :

Answer»

VANADIUM and COBALT
NICKEL and magnesium
Maganese and chromium
Aluminium and ZINC

Answer :C
Discussion
15008.

What are the limitations of VB theory?

Answer»

Solution :Limitations of VB theory
(i) It doesnot explainthe colour of thecomplex.
(ii) It considersthe spin only magnetic momentsand does not considerthe othercomponentsof magneticmoments.
(iii)it does not providea quantitativeexplanationas to whycertainas to why certaincomplexes are innerorbitalcomplexesand theotherare outerorbitalcomplexesfor thesame metal. For EXAMPLE, ` [Fe(CN)_(6)]^(4-)` is diamagnetic ( lowspin )whereas ` [FeF_(6)]^(4-)`is paramagntic (high spin).
Discussion
15009.

Which possesses highest lattice energy?

Answer»

NaCl
LiF
Csl
KF

Answer :B
Discussion
15010.

Two solutions A and B are separated by seimpereneable membrane . If liquid flows from A and B then :

Answer»

A is more CONCENTRATED than B
A is LESS concentrated thanB
Both SOLUTIONS have some concentration
None

Answer :B
Discussion
15011.

Write the main reason for the stability of colloidal sols.

Answer»

SOLUTION : Stability of COLLOIDAL sols is because of same and equal charge on all the colloidal PARTICLES.
Discussion
15012.

Which of the following compounds is aromatic alcohol?

Answer»

A, B, C, D
A, D
B, C
A only

Answer :C
Discussion
15013.

Which has maximum dipole moment?

Answer»




Solution :`vecmu_("net")=sqrt(mu_(1)^(2)+mu_(2)^(2)+2mu_(1)mu_(2)costheta)`
Discussion
15014.

Vapourpressureof puresolventand itssolutionat certaintemperatureare 600mm and600 mmof HgRespectivelyif 3.6xx10^(-3)kgof soluteisthemolarmassof solute( solvent=BenzeneC= 12, H=1 )

Answer»

`78.0 G MOL ^(-1)`
`58.5 g mol ^(-1)`
`72.0g mol ^(-1)`
`156 g mol ^(-1)`

ANSWER :A
Discussion
15015.

Which of the following halide ions are oxidised by MnO_(2)?

Answer»

`CL^(-)`<BR>`Br^(-)`
`F^(-)`
`I^(-)`

ANSWER :A::B::D
Discussion
15016.

Why are Zn,MnNi,Co not precipitated n the group III as hydroxides?

Answer»

Solution :The solubility PRODUCTS of hydroxides of Zn, Mn, Ni and Co are very high for this purpose they require high CONCENTRATION of `OH^(ɵ)` ions. This is not possible in the group III as `NH_(4)Cl` suppresses the ionisation of `NH_(4)OH` DUE to common ION effect.
Discussion
15017.

Under what conditions does a sturated solution become unsaturated.

Answer»

SOLUTION :By INCREASING the TEMPERATURE and by DILUTING the solution.
Discussion
15018.

Which one of the following electrolytes has the same value of van't Hoff factor (i) is that of Al_2(SO_4)_3 (if all are 100% ionised) ?

Answer»

`AL(NO_3)_3`
`K_4[FE(CN_6)]`
`K_2SO_4`
`K_3[Fe(CN_6)]`

ANSWER :B
Discussion
15019.

Transition elements form alloys easily because they have

Answer»

same number of shells
same ELECTRONIC configuration
nearly same atomic size
same atomic weight

Answer :C
Discussion
15020.

Which one is explosive ?

Answer»

`NH_4NO_3 +AL` POWDER
`PCl_5`
`PB(NO_3)_2`
`C_6H_5NO_2`

ANSWER :A
Discussion
15021.

Which of the following will be able to show geometrical isomerism ?

Answer»

`MA_(2)B_(2)`- Tetrahedral
MABCD - Tetrahedral
`MA_(3)B` - Square planar
MABCD - square planar

Solution :Tetrahedral complexes donot show any geometrical isomerism. Square planar complexes of the TYPE `MA_3B` ALSO donot show any geometrical isomerism. However, MABCD does exhibit geometrical isomerism . In establishing the position of one of the ligands (say A) in the square plane is kept fixed and the remaining three is kept in the TRANS position one by one. As a RESULT, following STEREOISOMERS or geometrical isomers are possible.
Discussion
15022.

The strongest reducing agent of the alkali metal is

Answer»

Li
Na
K
Cs

Solution :Li is a more REDUCING AGENT COMPARE to other element.
Discussion
15023.

The sand stone in some iron ores is removed by:

Answer»

Carbon FILTERS
COMPRESSED air
Limestone
sulphide acid

Answer :C
Discussion
15024.

Which of the following hormones contains iodine ?

Answer»

Insulin
Thyroxine 
ADRENALINE 
TESTOSTERONE 

ANSWER :B
Discussion
15025.

Which of the following is not a common component of Photochemical Smog?

Answer»

Ozone
Acrolein
Peroxyacetyl nitrate
CHLOROFLUOROCARBONS

Solution :The oxidised hydrocarbons and ozone in presence or HUMIDITY cause photochemical smong. Hydrocarbons `+O_(2),NO_(2),NO,O,O_(3),` PEROXIDES, formaldehyde, peroxyacetyl-nitrate (PAN), acrodein etc.Hence chlorofluorocarbons are not commoncomponent of photochemical smog.
Discussion
15026.

Which of the following combination of bond pair (b.p.) and lone pair (l.p.) give same shape ? (i) 3 b.p.+1 l.p. (ii) 2 b.p.+2 l.p. (iii) 2 b.p.1 l.p. (iv) 2 b.p. + 0 l. p. (v) 3 b.p. +2 l.p. (vi) 2 b.p.+3 l.p.

Answer»

II and iii
iv and v
iv and vi
iii and vi

Solution :
Discussion
15027.

Which of the following compound is used in gas lighter?

Answer»

`CeO_(2)`
PYROPHORIC misch metal
Nichrome
Nitinol

Answer :B
Discussion
15028.

Which of the following statement is correct about the half life period?

Answer»

It is proportional to initial concentration for zeroth order
Average life= 1.44 half life for first order REACTION.
Time to COMPLETE `75%` reaction is thrice of half life period in second order reaction.
`99.9%` of reaction takes place in 100 minutes for the case when rate constant is `0.0693 min^(-1)`

Solution :(a,b,C,d) are all CORRECT answers.
Discussion
15029.

Write the structure of chlorophenylmethane.

Answer»

SOLUTION :
Discussion
15030.

What arereducingand non - reducingsugars ?

Answer»

SOLUTION :(i) Reducing sugars : Thosecarbonydrateswhichcontianfree aldehydeor ketonic GROUPAND reducesFehling.ssoluiton and Tollen.sreagent are calledreducingsugars. Allmonosacchaideswhetheraldoseor ketoneare reducingsugares.
(II) Non - reducingsugars : Cabohydrateswhich do not reduce Tollen.sreagentand Fehling.ssolutionarecallednon - reducingsugars.ExampleSucrose. Theydo not havefree ALDEHYDEGROUP .
Discussion
15031.

Which one of the following sets of quantum numbers represents the highest energy level in an atom?

Answer»

n=4,l=0m=o,s=`+(1)/(2)`
n=3,l=1,m=1s=`+(1)/(2)`
n=3,l=2,m=-2,`s=+(1)/(2)`
n=3,l=0m=0,s=`+(1)/(2)`

Solution :The ORBITAL with HIGHEST (n+l) VALUE will have the highest ENERGY .In the GIVEN sets n=3 ,i=2,m=3=-2,s=+1/2 have n+l=5 i.e., 3d orbital has the highest energy.
Discussion
15032.

Calcium Hydroxide is also known as ?

Answer»

MILK of lime
Milk of magnesia
Milk Water
none

Answer :A
Discussion
15033.

Which of these have no unit

Answer»

ELECTRONEGATIVITY
ELECTRON affinity
Ionisation energy
Excitation potential

Solution :Electronegativity is the property of a BONDED ATOM. The relative tendency of an atom to attract the shared pair of electron TOWARD itself is called electronegativity.
Discussion
15034.

The word Buna is derived by combining first two letters of .........and with first two letters of ........

Answer»

SOLUTION :BUTADIENE, NATRIUM.
Discussion
15035.

When we can apply magnetic field in concentration of ores?

Answer»

Both ORES and gange possess ATTRACTION TOWARDS magnetic field. 
Both ores and gange do not possess attraction towards magnetic field. 
Either ores or gange, any one possess attraction towards magnetic field. 
None of the above. 

ANSWER :C
Discussion
15036.

Whichof 0.1M HCl and 0.1 M KCl do you expect to have greater molar conductance and why?

Answer»

Solution :Compare to 0.1 M HCl and 0.1 M KCl, 0.1 M HCl has greater MOLAR conductance.
`"Molar conductance of 0.1 M HCl "=39.132xx10^(-3)"Sm"^(2)"mol"^(-1)`
`"Molar conductance of 0.1 M KCl"=12.896xx10^(-3)"Sm"^(2)"mol"^(-1)`
Because, `H^(+)` ion in AQUEOUS solution being smaller size than `K^(+)` ion and `H^(+)` ion have greater MOBILITY than `K^(+)` ion. Which mobility of the ion increase, conductivity of that ions also increases. Hence, 0.1 M HCl solution has greater molar conductance than 0.1 M KCl solution.
Discussion
15037.

The structure of methyl phenyl ether is :

Answer»

`CH_(3)OC_(2)H_(5)`
`CH_(3)COC_(6)H_(5)`
`CH_(3)OC_(6)H_(5)`
`C_(6)H_(5)OC_(6)H_(5)`.

Answer :C
Discussion
15038.

which of the given compounds would undergo S_(N^(1)) reaction faster and why?

Answer»

SOLUTION :COMPOUND (B) would UNDERGO `S_(N^(1))` reaction faster because benzyl carbocation formed in the slow or rate determining step is RESONANCE stabilised while no resisnace is possible in the possible in the compound (A). For the resonating structure of benzyl carbocation.
Discussion
15039.

What is blue vitriol? How it is prepared?

Answer»

SOLUTION :Cupric sulphate `(CuSO_4cdot5H_2O)` is blue vitriol.
Preparation: It is prepared by dissolving cupric oxide in dilute sulphuric ACID. The solution is concentrated by EVAPORATION. Then blue crystals of copper sulphate pentahydrate SEPARATE out on cooling.
Discussion
15040.

Which of the following does not have alpha hydrogen ?

Answer»

FORMALDEHYDE
Acetadehyde
Dimethyl ACETALDEHYDE
ACETONE

ANSWER :A
Discussion
15041.

Which of the following is a fully flourinated polymer ?

Answer»

NEOPRENE
TEFLON
THIOKOL
PVC

Answer :B
Discussion
15042.

The 'Y' shaped protein molecules involved in the immune system are called:

Answer»

Antigen
Immunoglobulin
Pathogens
None of the above

Answer :B
Discussion
15043.

Which does not have a carboxyl group ?

Answer»

BENZOIC acid
Ethanoic acid
Pieric acid
Aspirin

Answer :C
Discussion
15044.

Which one of the following reagents will reduce diethyl ether to ethane and ethanol ?

Answer»

`NA // LIQ. NH_3`
COLD HI
`H_2SO_4`
`Al_2O_3//` heat

Answer :A
Discussion
15045.

What is the quantity of electricity (in coulombs) required to deposit all the silver from 250 ml of 1M AgNO_3 solution ? (Ag = 108)

Answer»

2412.5
24125
4825
48250

Answer :B
Discussion
15046.

The starting material for the manufacture of PVC is obtained by reacting HCI with ........................

Answer»


ANSWER :ACETYLENE
Discussion
15047.

Which monosaccharide units are present in starch , cellulose and glycogen and which linkages. Link these units ?

Answer»

SOLUTION :All these polysaccharides are made up of GLUCOSE units. In starch and glycogen. `alpha`-GLYCOSIDIC LINKAGES are presnet while in cellulose , `beta`-glycosidic linkages are present between glucose units.
Discussion
15048.

Two pieces of cotton wool soaked separetely in aqueous solution of NH_(3)and HCl are placed at opposite ends of a close glass tube as shown in diagram Select nearest position where white solid is formed

Answer»

I
II
III
White solid does not formed

SOLUTION :Volatile NATURE of `NH_(3)(H"bond")ltHCl(v.w.f)`
`NH_(3)+HClrarrNH_(4)Cl("white solid")`
Discussion
15049.

Write the structures of monomers used and one use of the following polymers: Buna-N.

Answer»

SOLUTION :`CH_(2) = UNDERSET("(1,3-Butadiene)")(CH) - CH = CH_(2) and CH_(2) = underset("(acrylonitrile)")underset(CN)underset(|)(CH)` are monomers of Buna - N.
ITIS usedin makingautomoblie tyres.
Discussion
15050.

Which of the following molecules involve sp^(3)d^(2) hybridisation ?

Answer»

1. `PF_(5)`
2. `IF_(7)`
3. `NF_(3)`
4. `SF_(6)`

ANSWER :D
Discussion