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2251.

Which is the coordination number in both hcp and ccp arrangements ?

Answer»

12
6
4
8

Answer :A
Discussion
2252.

Which of the following given statement(s) is/are correct for both fluorite and antifluorite structures? (i) coordination number of cation is 8 (ii) Number of formula unit is one unit cell is 4 (iii) 100% tetrahedral voids are occupied (iv) Radius ratio of cation and anion is 0.20

Answer»

(i) and (ii)
(i), (ii) & (iii)
(ii) and (iii)
(i), (ii), (iii) & (IV)

ANSWER :C
Discussion
2253.

The size of particles, in suspension, true solution and colloidal solution, varies in the order

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TRUE solution `gt` SUSPENSION `gt` COLLOIDAL
suspension `gt` true solution `lt ` colloidal
suspension `gt` colloidal `gt` true solution
true solution `gt` colloidal `gt` suspension.

Answer :C
Discussion
2254.

Which of following has highest B.P

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`CH_3-O-CH_3`
`C_2H_5-OH`
`C_2H_5-Cl`
`CH_3-CHO`

ANSWER :B
Discussion
2255.

Which of the following does not contain P-O-P bond

Answer»

Isohypophosphoric ACID
Diphosphorous acid
Diphosphoric acid
HYPOPHOSPHORIC acid

ANSWER :4
Discussion
2256.

The silver salt of a fatty acid on refluxing with an alkyl halide gives an

Answer»

Acids
ESTER
Ether
Amine

Solution :`RCOOAg+R'Itounderset("ester")(RCOOR')+AGI`
Discussion
2257.

Which is not a state function:

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INTERNAL energy
Entropy
Work
Enthalpy

Answer :C
Discussion
2258.

To a solution of substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of NH_(4)OH. However, when HCl is added to the original solution, a white precipitate is formed. The solution contained

Answer»

Lead salt
Silver salt
Mercurous salt
Copper salt

Solution :`Hg_(2)Cl_(2)` is white INSOLUBLE salt.
`Hg_(2)Cl_(2)+2NH_(4)OH to Hg+HGunderset("BLACK")ubrace((NH_(2))Cl+NH_(4)Cl)+2H_(2)O`
Discussion
2259.

What is the volume of 0.1 N-HCl required to react completely with 1.0 gm of pure calcium carbonate

Answer»

`100cm^(3)`
`150CM^(3)`
`250cm^(3)`
`200CM^(3)`

SOLUTION :Given, N=0.1, w=1.0 gm, equivalent weight=53,V=?
`V=(wxx1000)/(Eq.wt.xxN)=(1xx1000)/(53xx0.1)=188.67cm^(3) approx 200cm^(3)`
Discussion
2260.

Which among the followings is most acidic ?

Answer»

ACETIC acid
Formic acid
Chloroacetic acid
Ethanol

Answer :C
Discussion
2261.

TiCl_(4)+Na overset(Delta)to (X)+"compound"

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Van Arkel method
Mond's process
Zone refining method
Parke's method

Solution :`TiCl_(4)+4Na overset(DELTA)to TI+4NaCl`
Ti is obtained is PURIFIED by Van-Arkel process using `I_(2) as TiI_(4)` is THERMALLY unstable.
Discussion
2262.

The standard oxidation potentials of Zn and Ag in water at 25^(@)C are Zn(s) rarr Zn^(2+)+2e, E^(@)=0.76V Ag(s) rarr Ag^(+)+e, E^(@)= -0.80V Which reaction actually takes place ?

Answer»

`ZN^(2+)(aq.)+Ag^(+)(aq.) RARR Zn(s) + Ag(s)`
`Zn(s) + 2Ag^(+)(aq.) rarr Zn^(2+) + 2Ag(s)`
`Zn(s)+2Ag^(+)(s) rarr Zn^(2+) (aq.) + Ag^(+) (aq.)`
`Zn^(2+)+2Ag^(+)(s) rarr 2A^(+)(aq.) + Zn(s)`

Answer :B
Discussion
2263.

The total number of fractions (n) obtained in the following reaction is………………

Answer»


ANSWER :4
Discussion
2264.

Which of the following is an example of S_N2 reaction?

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`CH_3Br+OH^(-)rarrCH_3OH+BR^(-)`
`CH_3-underset(Br)underset(|)CH-CH_3OH^(-)rarrCH_3-underset(CH_3)-underset(OH)underset(|)CH-CH_3`
`CH_3CH_2OHoverset(-H_2O)rarrCH_2=CH_2`
`(CH_3)_3C-Br+OH^(-)RARR(CH_3)_3COH+Br^(-)`

Solution :Only `1^(@)` ALKYL halides (i.e. `CH_3Br`) UNDERGO `S_N2` reaction.
Discussion
2265.

The weakest base among NaOH, Ca(OH)_2 , KOH and Zn(OH)_2

Answer»

NaOH
`CA(OH)_2`
KOH
`ZN(OH)_2`

Answer :D
Discussion
2266.

The shielding effect of electrons increases in the order of

Answer»

<P>`F LT d lt p lt s`
`s lt p lt d lt f`
`f GT d gt s lt p`
`s gt p gt d = f`

ANSWER :A::D
Discussion
2267.

Which of the following best describes the emission spectrum of atomic hydrogen

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A discrete series of lines of equal intensity and equally spaced with RESPECT to wavelength
a series of only your lines
a CONTINOUS emissions of RADIATION of all FREQUENCIES
several discrete series of lines with both intensity and spaceing between the lines decreasing as the wave number increases with each series

Answer :D
Discussion
2268.

Which process involves the formation of polystyrene from styrene:

Answer»

Polymerisation
Racemization
Condensation
Reversible reaction

Answer :A
Discussion
2269.

Which of the following can be represented by the configuration [Kr]5s^(2)

Answer»

Ca
Sr
BA
RA

ANSWER :B
Discussion
2270.

Vinegar obtained from canesugar contains

Answer»

Citric ACID
Lactic acid
ACETIC acid
PALMITIC acid

Answer :C
Discussion
2271.

Which of the following does not give diazonium salt with nitrous acid at 273K ?

Answer»

Benzenamine
BENZYL AMINE
p-hydroxy aniline
o-hydroxy aniline

ANSWER :B
Discussion
2272.

What is the approximate percentage of iron in mischmetal?

Answer»


Solution :MISCHMETAL is an alloy which contains RARE earth ELEMENTS (94-95%), iron (5%) and traces of sulphur, carbon, silicon, CALCIUM and aluminium. It is used in gas LIGHTERS, tracer bullets and shells.
Discussion
2273.

Which of the following pairs of substances undergoes S_(N^(2)) substitution reaction faster and why? .

Answer»

SOLUTION :
Discussion
2274.

The standard reduction potential of Cu^(2+)|Cu and Ag^+|Ag electrodes are 0.337 and 0.799 volt respectively. Construct a galvanic cellusing these electrodes so that its standard emf is positive. For what concentration of Ag^(+) will the emf of the cell at 25^@ C be zero if the concentration of Cu^(2+) is 0.01M?

Answer»

Solution :As `E_(AG^+)^@, Ag` is more POSITIVE than `E_(cu^(2+))^@, Cu` the FORMER will acts as cathode and the LATTER, anode. Thus the cell may be represented as
`Cu,Cu^(2+)||Ag^+, Ag`
Further, given that `[Cu^(2+)]=0.01M and E_(cell)=0` we have,
`E_(cell)=E_(Ag)^+, Ag-E_(cu)^(2+), Cu=0`
`{ E_(Ag^+)^@, Ag+ 0.0591/1 log[Ag^+]}- {E_(cu^(2+))^@, Cu+ 0.0591/2 log[Cu^(2+)]}=0`
or `{0.799+ 0.0591/2 log[Ag^+]}- {0.337+ 0.0591/2 log (0.01)}=0`
or `log[Ag^+]=-8.8172=overline9 .1828`
Taking antilog
`[Ag^+]=1.52 times 10^-9 M`
Discussion
2275.

What is [OH^(-1)] of the solution at the equivalence point at 25^(@) C

Answer»

`7xx10^(-6)` M
`5 xx10^(-5)` M
`2xx10^(-8)` M
`4XX10^(-6)` M

Answer :A
Discussion
2276.

What are solvate isomers?

Answer»

Solution :The exchange of FREE solvent molecules such as water , AMMONIA,ALCOHOL etc.. In the crystal lattice with a ligand in the coordination ENTITY willgive different isomers . These type of isomers are called SOLVATE isomers.
Discussion
2277.

The shape of carbanium ion is:

Answer»

Planar
Linear
Pyramidal
None of these

Answer :A
Discussion
2278.

Which one of the following is not used to identify the types of emulsion?

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DYE TEST
viscosity test
conductivity test
TOLLEN's test

Solution :Tollen.s test
Discussion
2279.

When a solid is coverted directly into gaseous state, the process is called sublimation. The entropy change during the process is :

Answer»

zero
negative
positive
may be negative

Answer :C
Discussion
2280.

Unknown compound A C_9H_8O_5 on methylation with (CH_3)SO_4//NaOH forms methyl derivative whose MW is 210. The number of hydroxyl groups is A is

Answer»

FIVE
FOUR
ONE
three

Answer :C
Discussion
2281.

Which of the following reactions is not involved in serpeck's process of leaching of Al_2O_3 from white bauxite ore ?

Answer»

`Al_2O_3+N_2+3Coverset(DELTA)rarr2AlN+3CO`
`SiO_2+Coverset(Delta)rarrSi+2CO`
`Na_2CO_3+Al_2O_3overset(Delta)rarr2NaAlO_2+CO_2`
`2AL(OH)_3overset(Delta)rarrAl_2O_3+3H_2O`

ANSWER :C
Discussion
2282.

Which is the commercial method for the manufactureof phenol ?

Answer»

CUMENE PROCESS
From benzenesulphonic ACID
Raschig's process
DOW's process

ANSWER :A
Discussion
2283.

Write the names of the monomers of the polymer [--NH-(CH_2)_6 - NH-underset(O)underset(||)C-(CH_2)_4-underset(O)underset(||)C--]_n

Answer»

SOLUTION :(i) HEXAMETHYLENEDIAMINE (II) ADIPIC ACID.
Discussion
2284.

which of the compounds give cine substitution produced on reaction with NaNH_(2) in liquid NH_(3)?

Answer»




ANSWER :A::B::D
Discussion
2285.

Which of the following statement is appropriate for physical adsorption ?

Answer»

More energy of activation is required. 
MULTIMOLECULAR LAYERS can be FORMED on the adsorbent. 
There is no special effect of CHANGE in temperature.
It is irreversible. 

SOLUTION :Multimolecular layers can be formed on the adsorbent.
Discussion
2286.

What happen when : an emulsion is centrifuged ?

Answer»

Solution :When an emulsionis centrifuged , de-emulsification occurs. De-emulsification is DEFINED as BREAKING of emulsion into its CONSTITUENTS.
Discussion
2287.

What are the monomers of Nylon 6 and Nylon 6,6

Answer»

SOLUTION :NYLON 6 to caprolactam
Nylon 66 to Hexamethylene DIAMINE and Adipic acid
Discussion
2288.

When I coulomb of electric current is passed the amount of substance deposited or liberated is known as ……………….

Answer»

equivalent MASS
ELECTRO chemical equivalent
MOLAR mass
1Faraday

ANSWER :B
Discussion
2289.

When acetamide reacts with Br_(2) and caustic soda, then we get

Answer»

ACETIC acid
bromoacetic acid
ethylamine
`CH_(3)CH_(2)`

ANSWER :D
Discussion
2290.

When an element forms an oxide in which oxygen is 20% of the oxide by mass, the equivalent mass of the element will be:

Answer»

32
40
60
128

Answer :A
Discussion
2291.

Which group out of -NO_2 and -C_6H_5 is an o-/p- directing group and which one is a m-directing group ?

Answer»

SOLUTION :`-NO_2tom-"DIRECTING", -C_6H_5to` o-/p directing.
Discussion
2292.

Which of the following substance does not produce Triodomethane with the mixture of alkali and I_(2) ?

Answer»

Ethanol
Dimethyl KETONE
Propan-1-ol
Ethanal

Solution :(A) `CH_(3)CH_(2)OH_((l))+3Na_(2)CO_(3(aq))+4I_(2(aq))to CHI_(3)+4H_(2)O+5NaI+HCOONa+3CO_(2)`
(B) `CH_(3)COCH_(3)overset(NaOH+I_(2))underset((NaOI))RARR CH_(3)COONa+CHI_(3)`
(C ) `CH_(3)CH_(2)CH_(2)OH overset(NaOH+I_(2))underset((NaOI))rarr` not a reaction.
(D) `CH_(3)CHO : 3CH_(3)-overset(O)overset("||")("C")-Hoverset(NaOH+I_(2))underset((NaOI))rarr 3CH_(3)COONa+CHI_(3)`
Discussion
2293.

Volume of 0.2 M H_(2)SO_(4) solution contain 20 millimoles of the solute is

Answer»

`10 cm^(3)`
`100 cm^(3)`
`20 cm^(3)`
`200 cm^(3)`

SOLUTION :0.2 MOL, i.e., 200 millimoles are PRESENT in 1000 cc. Hence, 20 milimoles will be present in 100c.
Discussion
2294.

Which of the following does not form cage compounds ?

Answer»

Ar
Ne
Xe
Kr

Solution :Neon due to its small SIZE does not FORM cage compounds.
Discussion
2295.

Which of the following is more volatile : o-nitrophenol or p-nitrophenol?

Answer»

Solution :The ISOMER o-nitrophenol with LOWER BOILING point is more volatile.
Discussion
2296.

Which control the secretion of all hormones

Answer»

kidney
liver
heart
pituitary gland

Answer :D
Discussion
2297.

which of the following reaction doesn't give benzene

Answer»

`C_(6)H_(5)N_(2)Cl UNDERSET(H_(2)O)overset("boiling")to`
`C_(6)H_(5)N_(2)Clunderset(DELTA)overset(C_(2)H_(5)OH)to`
`C_(6)H_(5)N_(2)Cl+H_(3)PO_(2)+H_(2)Oto`
All of these

Solution :`C_(6)H_(5)N_(2)Cl underset(H_(2)O)overset("boiling")toC_(6)H_(5)OH+N_(2)+HCl`
Discussion
2298.

Which of the following reactions is shown by alkynes

Answer»

Addition
SUBSTITUTION
POLYMERIZATION
All of these

Solution :Addition - `CH-=CH+3H_2 OVERSET"Ni"to CH_3-CH_3`
Substitution - `CH-=CH+Na to CH -= C^(-) Na^(+) +1/2H_2`
Polymerization -`3CH-=Chunderset"Polymerization"overset"hot Cu tube"to UNDERSET"Benzene"(C_6H_6)`
Discussion
2299.

Various phenol derivatives, tincture of iodine (2- 3%) I_2 in (water I alcohol) and some dyes like methylene blue are

Answer»

antiseptics
disinfectants
analgesics
antipyretics

Solution :Antiseptic drugs CAUSE DESTRUCTION of micro-organism that PRODUCE septic disease e.g. Dettol, Savlon, BORIC acid, Phenol, lodofonn, `KMnO_4` and some dye such as methylene blue, genation VIOLET
Discussion
2300.

The reducing agent in electrolysis of alumina

Answer»

`CaF_2`
`Na_2AIF_6`
GRAPHITE 
`Al_2O_3`

SOLUTION :Graphite anodes ACT as reducing AGENT.
Discussion