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4301.

Which one of the following species is stable in ferromagnetic?

Answer»

`MnO_(4)^(3-)`
`MnO_(4)^(2-)`
`Cu^(+)`
`Cr^(2+)`

Answer :B
Discussion
4302.

Which one of the following is a poly saccharide ?

Answer»

SUCROSE
CELLULOSE
MALTOSE
Reffinose

Solution :cellulose
Discussion
4303.

Treatment of CS_2 with axcess of Cl_2 gives:

Answer»

`C Cl_4`
`CH_3Cl`
CARBON BLACK
`C_2H_5Cl`

ANSWER :A
Discussion
4304.

Write thebalancedequationfor theereaction when ''a mixture of potassium chlorateacid and sulphuric acid is heated.''

Answer»

SOLUTION :`3KCIO_(3) + 3H_(2)SO_(4) (conc) OVERSET(Delta)(to)3KNHSO_(4) + HCIO_(4) + 2CIO_(2) + H_(2)O`
`(COOH)_(2) overset(conc H_(2)SO_(4))(to) CO + CO_(2) + H_(2)O`
Discussion
4305.

What is the action of bromine in ethanoic acid on anisole?

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SOLUTION :
Discussion
4306.

Which of the following is not the property of crystalline solids ?

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definite geometry
sharp MELTING point
isotropy
anisotropy

Solution :CRYSTALLINE SOLIDS are ANISOTROPIC.
Discussion
4307.

The smaller the ........... value, greater will be precipitation of colloids.

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SOLUTION :FLOCCULATION
Discussion
4308.

Which metal amongthe followinghas the highestpakcingefficiency?

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iron
TUNGSTEN
aluminium
polonium

Solution :Aswe KNOW fcc and HCP crystales have high paking efficiency since iron and tungstenhave bcc while polonium has rhombohedral STRUCTURE so they have LESSER pakcing efficiency but aluminium has fcc structure hence has highest packing efficiency among the given
Discussion
4309.

To dissolve argentite ore which of the following is

Answer»

`NA[AG(CN)_2]`
NaCN
NaCl
HCl

Answer :B
Discussion
4310.

Write the ground state electronic configuration of Fe^3+ ion.

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SOLUTION :`Fe^3+ rarr1s^2 2s^2 2p^6 3s^2 3p^6 3D^5`( Three ELECTRONS- TWO from 4s and one from 3d are removed).
Discussion
4311.

Which of the following catalyst is used for preparing toluene by reacting benzene with methyl chloride ?

Answer»

Ni
Anhydrous `AlCl_(3)`
Pd
Pt

Answer :B
Discussion
4312.

Write the structures of the major products in each of the following reaction: (i). CH_(3)-CH-CH_(2)-Cl+NaIunderset((heat))overset(("acetone"))to (ii). (CH_(3))_(3)CBr+KOHunderset((heat))overset((Ethanol))to (iii). CH_(3)CH(Br)CH_(2)CH_(3)+NaOHoverset("Water")to (iv). CH_(3)CH_(2)Br+KCNoverset("Ethanol (aq)")to (v). C_(6)H_(5)ONa+C_(2)H_(5)Cl to (vi). CH_(3)CH_(2)CH_(2)OH+SOCl_(2)to (vii). CH_(3)CH_(2)CH=CH_(2)+HBroverset(("peroxide"))to (viii). CH_(3)CH=C(CH_(3))_(2)+HBrto

Answer»

SOLUTION :
Discussion
4313.

Which of the following compound is found abundantly in nature?

Answer»

Fructose
Starch
Glucose
Cellulose

Answer :D
Discussion
4314.

Write the structures of the following organic halogen compounds.1-Chloro-4-ehylcyclohexane

Answer»

SOLUTION :
Discussion
4315.

Which is an essential trace element involved in physiology of thyroid glands:

Answer»

Fe
Ca
Na
`I_2`

ANSWER :D
Discussion
4316.

The viable particulate among the following is

Answer»

fumes
ALGAE
smoke
mist

Solution :Algae.
Discussion
4317.

Which of the following are alpha-emitters?

Answer»

`Po^(213)`
`PB^(215)`
`Rn^(222)`
`Ra^(226)`

ANSWER :A::D
Discussion
4318.

Unlike most hydrocarbons, azulene (C_(10)H_(8)) is highly coloured (deep blue), although its is omer, nephthalene does not have significant zwitter-ionic character , azulene does. (i) Draw a reasonance structure of azulene in which five-membered ring is anionic and the seven-membered ring cationic. (ii) Can azulene be considered aromatic ?

Answer»


SOLUTION :N//A
Discussion
4319.

Which polymer is used to prepare synthetic wool ?

Answer»

SBR
PTFE
PAN
PHBV

SOLUTION :PAN
Discussion
4320.

Volume of 0.1 M H_(2)SO_(4) required to neutralize 30 ml of 0.2 N NaOH is

Answer»

30 ml
15 ml
40 ml
60 ml

Solution :`0.1M" of "H_(2)SO_(4) implies0.2N" of "H_(2)SO_(4)`
`thereforeN_(1)V_(1)=N_(2)V_(2)`[N=2M for `H_(2)SO_(4)`]
`0.2xxV_(1)=0.2xx30`
`thereforeV_(1)=30ML`
Discussion
4321.

Treatment of benzene with CO //HCI in the presence of anhydrous AICI_(3)//CuCI followed by reaction with Ac_(2)O //NaOAc gives compound X as the major product. Compound X upon reaction with Br_(2)//Na_(2)CO_(3), followed by heating at 473K with most KOH furnishes Y as the major product. Reaction of X with H_(2)//Pd-C, followed by H_(3)PO_(4) treatment gives Z as the major product. The compound Z is

Answer»




SOLUTION :
Discussion
4322.

When a mixture of iodine , alcohol and aqueous sodium carbonate are heated, the product formed is

Answer»

SODIUM formate and chloroform
Only `CO_(2)`
Iodoform and sodium formate
Ethyl CARBONATE and sodium iodide

Answer :C
Discussion
4323.

Treatment of benzene with CO //HCI in the presence of anhydrous AICI_(3)//CuCI followed by reaction with Ac_(2)O //NaOAc gives compound X as the major product. Compound X upon reaction with Br_(2)//Na_(2)CO_(3), followed by heating at 473K with most KOH furnishes Y as the major product. Reaction of X with H_(2)//Pd-C, followed by H_(3)PO_(4) treatment gives Z as the major product. The compound Y is

Answer»




SOLUTION :
Discussion
4324.

When iodoform is treated with sliver powder it forms :

Answer»

ACETYLENE
ethylene
methane
ethane

Answer :A
Discussion
4325.

Which of the following is terpineol

Answer»

`CH_(3)-underset(CH_(3))underset(|)overset(C_(6)H_(5))overset(|)C-OH_(3)`


Answer :B
Discussion
4326.

What is the coordination number in[Nl(en)_(3)]Cl_(2) ? Explain it.

Answer»

Solution :In `[Ni(EN)_(3)]Cl_(2),` the coordination number of `Nl^(2+)` is also `6`. The ligand "en" represents ETHANE `-1,2-` DIAMINE`(H_(2)N-CH_(2)-CH_(2)-NH_(2))` and it contains two donor atoms (Nitrogen).
Each ligand forms two coordination bonds with nickel. So, totally there are six coordination bonds between them.
Discussion
4327.

Which of the followingsigma- complexes more stable than the sigma -complex of benzene -

Answer»




ANSWER :A::D
Discussion
4328.

Write is a salt bridge ? What is it used for ?

Answer»

Solution :A salt bridge is a U - shaped tube containing concentrated solution of an INERT ELECTROLYTE like `KCl, KNO_3, K_2SO_4`, etc., or a solidified solution of an electrolyte such as agar-agar and GELATINE. It is used,
(i) To complete the electrical circuit by allowing IONS to flow from one solution to the other without mixing the two solutions .
(ii) To maintain the electrical neutrality of the solutions in the two half CELLS.
Discussion
4329.

What is the action of acidified potassium dichromate on hydrogen sulphide ?

Answer»

Solution :`K_(2)Cr_(2)O_(7)+4H_(2)SO_(4) +3H_(2)S rarr K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+7H_(2)O+3S`
Discussion
4330.

The total amount of energy in the universe is fixed, but:

Answer»

MATTER is increasing
Gravitation is decreasing
Disorder is increasing
Lightening is increasing

Answer :C
Discussion
4331.

When O_3 is passed through an aqueous solution of KI, the pH of the resulting solution is

Answer»

7
6.8
2.8
`10-14`

SOLUTION :`O_(3) + 2KI + H_2O to 2KOH + I_2 + O_2`
Discussion
4332.

Weight ratio of roasted ore, coke and lime stone fed into the blast furnace in the manufacture of cast iron is

Answer»

`8:1:4`
`6:4:1`
`8:4:1`
`8:4:3 `

ANSWER :C
Discussion
4333.

Which of the following hydride is capable of showing conformations

Answer»

`NH_(2) - NH_(2)`
`B_(2)H_(6)`
`CH_(4)`
NONE of these

Answer :A
Discussion
4334.

Which of the following gases exist more abundantly in nature than the others

Answer»

HELIUM
Neon
ARGON
Krypton

Solution :`{:("Gas",,"(Abundance in air by volume (ppm))"),("Helium",,"5.2"),("Neon",,"18.2"),("Argon",,"93.4"),("Krypton",,"1.1"),("XENONE",,"0.09"):}`
Discussion
4335.

Which of the following oxide has the maximum basicity?

Answer»

`La_(2)O_(3)`
`Pr_(2)O_(3)`
`Sm_(2)O_(3)`
`Gd_(2)O_(3)`

Answer :A
Discussion
4336.

The resistance of 0.01 N solution of an electrolyte waw found to be 210 ohm at 298 K, when a conductivity cell with cell constant 0.66 cm^(-1) is used. The equivalent conductance of solution is:

Answer»

`314.28` mho `cm^(2)EQ^(-1)`
`3.14` mho `cm^(2)eq^(-1)`
`31.428` mho `cm^(2)eq^(-1)`
`0.314` mho `cm^(2)eq^(-1)`

Answer :A
Discussion
4337.

Which of the following is a colligative property?

Answer»

MOLAR mass
Osmotic pressure
Viscosity
Optical activity

Answer :B
Discussion
4338.

What is the name of the following reaction : RCOCl + H_(2) overset(pd-BaSO_(4))to RCHO + HCl

Answer»

STEPHEN reaction
Rosenmund reaction
Etard reaction
Aldol condensation

Answer :B
Discussion
4339.

What is LDPE? Give its preparation and uses.

Answer»

Solution :(i) LDPE is low density poly ethylene. It is formed by heating ethene at` 200^(@)` to `300^(@)C` under oxygen as a catalyst. This reaction follows FREE radical mechanism. The peroxide formed from oxygen acts as a free radical initiator.
` underset("(ethene)")(nCH_2=CH_2) underset(1000 atm)overset(200^(@) - 300^(@)C)to underset("(POLYTHENE)")((--CH_(2)-CH_(2)--)_n)`
(ii) LDPE is USED as insulation for CABLES, making toys.
Discussion
4340.

Which of the following would act as Bronsted acid?

Answer»

`NaBH_(4)`
`B_(2)H_(6)`
`SiH_(4)`
`HCo(CO)_(4)`

SOLUTION :`HCo(CO)_(4)to[(Co(Co_(4)))]^(-)+H^(+)`
Discussion
4341.

What are bio degradable polymers? Give examples.

Answer»

Solution :`implies` The materials that are readily DECOMPOSED by micro organisms in the ENVIRONMENT are called biodegradable.
`implies ` Natural polymers DEGRADE on their own after certain period of time but the synthetic polymers do not.
`implies`The biopolymers which disintergrates by themselves in biological SYSTEMS during a certain period of time by enzymatic hydrolysis and to some extent by oxidation are called biodegradable polymers.
Examples:
(i) Polyhydroxy butyrate (PHB)
(ii) Polyhydroxy butyrate-co-B- hydroxyl valerate (PHBV)
(iii) Polylactic acid (PLA)
Discussion
4342.

What happens when SO_2 is passed through caustic soda solution ?

Answer»

SOLUTION :`NaHSO_3` and `Na_2SO_3` is FORMED .
`NAOH + SO_2 RARR NaHSO_3`
`2NAOH + SO_2 rarr Na_2SO_3 + H_2O`
Discussion
4343.

What is co-ordination entity ?

Answer»

SOLUTION :It contains central metal atom bonded by ligands.
EXAMPLE : `(CoCl_3 (NH_3)_3]` is a co-ordination entity in which Co is SURROUNDED by `NH_3` molecules and `CI^-` IONS.
Discussion
4344.

Which of the following reagents cannot be used to distinguish between pentanal and pentan-2-one ?

Answer»

TOLLEN's REAGENT
Fehling solution
`I_2" in" NaOH `
`Br_2` in `C Cl_4`

ANSWER :D
Discussion
4345.

What is osmotic pressure ? Explain and derive equation.

Answer»

Solution :The flow of the solvent from its side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution. This pressure that just stops the flow of solvent is CALLED osmotic pressure `(pi)` of the solution. In SHORT, the pressure which stops the spontaneous flow of solvent is known as osmotic pressure `(pi)` of the solution.
The flow of solvent from dilute solution to the concentrated solution across a semipermeable membrane is due to osmosis. The important point to be kept in MIND is that solvent molecules always flow from lower concentration to higher concentration of solution. The osmotic pressure has been found to depend on the concentration of the solution.

Osmotic pressure is a colligative property as it depends on the number of solute molecules and not on their identity. For dilute solutions, osmotic pressure is proportional to the molarity, C of the solution at a given temperature T. Thus ,
`therefore pi = " CRT" therefore pi = (n_(2))/(V)RT`
Here, `pi` is the osmotic pressure, R is the gas constant and V is the VOLUME of solution.
V is volume of a solution in litres containing `n_(2)` moles of solute. If `w_(2)` grams of solute, of molar MASS, `M_(2)` is present in the solution, then `n_(2)=(w_(2))/(M_(2))`
`therefore pi V=(w_(2)RT)/(M_(2))`
Thus, knowing the quantities `w_(2), T pi` and V we can calculate the molar mass of the solute.
Discussion
4346.

Which of the following is INCORRECT about insulin?

Answer»

It CONTAINS 51 amino acids.
It is a peptide hormone.
It CONTROLS PROTEIN metabolism in the body.
It lowers the blood sugar.

Answer :C
Discussion
4347.

Which of the following statements is not true regarding hexagonal and cubic close-packed structures-

Answer»

for both structures COORDINATION number is the same
both structures have the same packing efficiencies
packing efficiency of HEXAGONAL close-packed structure is LESS than that of cubic close-packed structure
the number of particles per UNIT cell in hexagonal close-packed structure is more than that in cubic close-packed structure

Answer :C
Discussion
4348.

Which of the following is not true about the ionic solids?

Answer»

Bigger ions form the close-packed STRUCTURE. 
Smaller ions occupy either the TETRAHEDRAL or the octahedral VOIDS depending upon their size. 
Occupation of all the voids is not necessary. 
The fraction of octahedral or tetrahedral voids occupied depends upon the RADII of the ions occupying the voids.

Solution :`("r void")/("r sphere") = 0.414` [Octahedral void)
`("r void")/("r sphere") = 0.225` (Tetrahedral void)
Discussion
4349.

The volume of atoms present in body centred cubic unit cell of a metal of atomic radius r is,

Answer»

`(16)/(3)pi r^(3)`
`(8)/(3) pi r^(3)`
`(12)/(3)pi r^(3)`
`(24)/( 3) pi r^(3)`.

ANSWER :B::C
Discussion
4350.

Which mechanism is followed in the conversion of ethanol to bromoethane by HBr?

Answer»

`SN^(1)` MECHANISM
`SN^2` mechanism
`E_1` mechanism
`E_2` mechanism

SOLUTION :`E_1` mechanism
Discussion