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6801.

Which of the following react with dil. H_(2)SO_(4).?

Answer»

`CaCO_(3)`
`KNO_(2)`
`Na_(2)S`
`ZnSO_(3)`

Solution :All these SALTS react with dil.`H_(2)SO_(4)`
Hence,(A),(B),(C) and (D) are the correct ANSWERS.
Discussion
6802.

Two samples of DNA , A and B have melting temperatures (T_m) 340 and 350 K respectively. Can you draw any conclusion from these data regarding their base content ?

Answer»

SOLUTION :We KNOW that CG base pair has three H-bonds and AT base pair has two H-bonds, therefore, CG base pair is more stable than AT base pair. Since sample B has higher melting TEMPERATURE than sample A, therefore, sample B has higher CG content as compound to sample A.
Discussion
6803.

There are four complexes of Ni. Select the complex(es) which will be attracted by magnetic field: (I) [Ni(CN)_4]^(2-) (II) [NiCl_(4)]^(2-) (III) Ni(CO_(4)) (IV) [Ni(H_(2)O)_(6)]^(2+)

Answer»

I only
IV only
II, III and IV
II and IV

Answer :D
Discussion
6804.

What is an ambidentate group?

Answer»

SOLUTION :It is an ION or group which can ATTACK from both SIDES, e.g., `C -= N^(-)`
Discussion
6805.

Which of the following is /are organometallic compound(s) ? 1) C_(2)H_(5)MgI 2) C_(2)H_(5)ONa 3) (CH_(3)COO)_(2)Ca 4) CH_(3)COOK

Answer»

only 1
only 1 and 2
only 1, 3
all of these

Answer :A
Discussion
6806.

Which of the following are not thermosetting polymers ?

Answer»

BAKELITE
POLYSTYRENE
PVC
Melmac

Answer :B::C
Discussion
6807.

What is AZT ? To which use is it being put?

Answer»

SOLUTION :AZIDOTHYMIDINE USED for AIDS VICTIMS.
Discussion
6808.

Which is not true for ozone ?

Answer»

It oxidizes LEAD sulphide
It oxidizes POTASSIUM iodide
It oxidizes mercury
It cannot ACT as BLEACHING agent

Answer :D
Discussion
6809.

What is the composition of colloidion solution ?

Answer»

SOLUTION :`4%` solution of NITROCELLULOSE in a MIXTURE of ALCOHOL and ether .
Discussion
6810.

Which of the following halide of group 13 elements does not exists:

Answer»

THALIUM (I) iodide
Thalium (III) iodide
Thalium (I) triiodide
Bis-aluminium (III) iodide

Solution :Because of INERT PAIR EFFECT.
Discussion
6811.

Which of the following elements does not show alltropy?

Answer»

Nitrogen
Bismuth
Antimony
Arsenic

Solution :Nitrogen does not show ALLOTROPY due to its weak N__N single bond. Therefore, ability of nitrogen to form polymeric structure or more then ONE structure or BECOME LESS. Hence , nitrogen does not show allotropy.
Discussion
6812.

Xenon forms fluoride easily. Explain.

Answer»

Solution :FLUORINE is highly ELECTRONEGATIVE. When it reacts with xenon ATOM, energy is RELEASED and helps to form fluoride easily.
Discussion
6813.

Volatile metals are purified by:

Answer»

Liquation
Distillation
Cupellation
Electrolysis

Answer :B
Discussion
6814.

Which of the following is not a peroxy acid ?

Answer»

Perphosphoric acid
Pernitric acid
Perdisulphuric acid
PERCHLORIC acid

SOLUTION :Perchloric acid `(HClO_(4))` does not contain a peroxide bond.
Discussion
6815.

What is electrical conductance of a solution ? How is it measured experimentally ?

Answer»

Solution :The reciprocal of resistance (R ) is known as conductane (c )
`l/R=k xx(l)/(l//A)`
`c=k xx(l)/(l//A)`
`to` The conductance or the current conducting capacity of an electrolytic solution can be expressed as
i) Specific conductance (k), ii) Molar conductivity `(^^_(m))`
i) Specific conductance : The conductance of the solution enclosed between two parallel electrodes of unit area of cross section separated by unit distance is CALLED specific conductance (k).
ii) Molar conductivity `(^^_(m)):` The conductivity of a volume of solution containing one gram molecular weiht of the electrolyte placed between two parallel electrodes separated by a distance of unit length of 1 meter is called molar conductivity `(^^_(m))`
Relation between conductivity and molar conductivity :
`^^_(m) =k/c,therefore c=` CONSTANT
Measurement of electrical conductance :
`to` The resistance of a metallic wire can be measured with a WHEATSTONE bridge.
`to` In measuring the resistance of an electrolytic solution tow problems are identified.
i) On PASSING direct current (DC) through the solution charges the composition of the solution due to electrolysis.
ii) A solution cannot be connected to the mmeasuring bridge like a metallic wire.
` to` ii) A solution cannot be connected to the measuring bridge like a metallic wire.
`to` First proble solved by using AC instead of DC.
`to` Second problem solved by using specilly designed vessel called conductivity cell.

By using above cells,
Resistance `R=(l)/(k xxA)`
l = distance between electrodes : A = Area of cross section, k = conductivity `l/A` = cell constant `=G^(**)`
`therefore G^(**)=l/A =Rxxk`
The cell constant `(G^(**))` is determinded by measuring the resistance of the cell containing a solution whose conductivity is already known
`to` Cell constant once determined, used for measuring the resistance (or) conductivity.
`to` The set up for the measurement of the resistance is shown in following figure.
Unknown resistance `R_(2) =(R_(1)R_(4))/(R_(3))`
Conductivity of solution `(k) =("Cell constant " (G^(**)))/(R)`
Molar conductivity `^^_((m))=k/c =(k (S CM ^(-1)))/(1000(Lm^(-3))xx"Molarity (moles//lit)")`
Discussion
6816.

Which of the following conditions is favourable for the production of ammonia by Haber's process

Answer»

HIGH concentration of reactants
LOW temperature and high pressure
CONTINUOUS removal of AMMONIA
All of these

ANSWER :D
Discussion
6817.

Which is the incorrect statement.

Answer»

Density decreases in case of crystals with Schottky's DEFECT
NaCl[s] is insulator, silicon is semiconductor , sivler is CONDUCTOR, quartz is piezo electric crystal.
Frenkel defect is favoured in those ionic COMPOUNDS in which sizes of CATION and anions are almost equal.
`FeO_(0.98)` has non stoichiometric metal deficiency defect.

Solution :In Frenkel defect the radius of cation MUST be very less than anion.
Discussion
6818.

Which of the followingis resistant to boiling aqua-regia

Answer»

Polythene
Perspex
Teflon
Bakelite

Solution :Teflon is flexible, inert to SOLVENTS and to BOILING with acids EVEN to aqua-regia and is STABLE upto 598 K
Discussion
6819.

Two different electrolytic cells filled with molten Cu(NO_(3) )_( 2) and molten A1(NO_(3) )_( 3) respectively are connected in series. When electricity is passed 2.7 g Al is deposited on electrode. The mass of Cu deposited on cathode will be:

Answer»

`190.5` G
`9.525` g
`63.5` g
`31.75` g

Answer :C
Discussion
6820.

Write the names associated with the following reactions : (a) RCONH_(2)+Br_(2)+4NaOH rarr RNH_(2)+Na_(2)CO_(3)+2NaBr+2H_(2)O (b) ArN_(2)^(+)X^(-) overset(CuCN//KCN)(rarr)ArCN+N_(2) (c) R-NH_(2)+CHCl_(3)+3KOH overset("Heat")R-NC+3KCl+3H_(2)O (d) ArN_(2)^(+)X overset(Cu//HCl)(rarr) ArCl+N_(2)+CuX

Answer»

SOLUTION :
Discussion
6821.

Which of the following alcohols will yield the corresponding alkyl chlride on reaction with concentrated HCl at room temperature ?

Answer»

`CH_(3)CH_(2)-CH_(2)-OH`
`CH_(3)CH_(2)-underset(CH_(3))underset("|")("C ")H-OH`
`CH_(3)CH_(2)-underset(CH_(3))underset("|")("C ")H-CH_(2)OH`
`CH_(3)CH_(2)-overset(CH_(3))overset("|")underset(CH_(3))underset("| ")("C")-OH`

SOLUTION :`3^(@)` alcohols are more reactive TOWARDS HCl because of formation of `3^(@)` CARBOCATION whereas, the reaction of `1^(@)` and `2^(@)` alcohol with HCl requires catalyst.
Discussion
6822.

Which halogen shows some metallic character ?

Answer»

`F_2`
`Br_2`
`I_2`
`Cl_2`

SOLUTION :Iodine with large atomic SIZE, low ionisation enthalpy and ELECTRONEGATIVITY show some metallic property. It is SOLID and has metallic lustre.
Discussion
6823.

Which of the following compounds can form a zwitterion ?

Answer»

BENZOIC acid
Acetanilide
Aniline
Glycine

Answer :D
Discussion
6824.

What is the S.I. unit of density ?

Answer»

SOLUTION :`"KG m"^(-3)`
Discussion
6825.

The vapour pressure of pure benzene at a certain temperature is 0.500 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass "78 g mol"^(-1)). The vapour pressure of the solution then is 0.845 bar. What is the molar mass of the solid substance ?

Answer»

SOLUTION :Here, we are GIVEN that `w_(2)=0.5 g, w_(1)=39.0g, M_(1)="78 g mol"^(-1)`
`p^(@)="0.850 BAR, "p_(s)="0.845 bar"`
SUBSTITUTING these VALUES in the formula, `(p^(@)-p_(s))/(p^(@))=(n_(2))/(n_(1))=(w_(2)//M_(2))/(w_(1)//M_(1))=(w_(2)M_(1))/(w_(1)M_(2))`, we get
`=("0.850 bar"-"0.845 bar")/("0.850 bar")=(0.5 gxx"78 g mol"^(-1))/(39.0g xxM_(2))`
`"or"M_(2)=(0.5xx78)/(39.0)xx(0.850)/(0.005)" g mol"^(-1)="170 g mol"^(-1)`
Discussion
6826.

Wtite the molecular composition of the following ores and mentions it metal magnitude, calamine and bauxite.

Answer»

SOLUTION :
Discussion
6827.

Which of the metals doesnot corrode inspite of favourable standard electrode potential?

Answer»

`Ti`
`Al`
both (1) and (2)
`Fe`

SOLUTION :Aluminium , a very ACTIVE metal, reacts rapidly with `O_(2)` form the air to form a surface layer of aluminium oxide, `Al_(2)O_(3)`, that is so thin that it is trasparent. This very tough, hard substance is inert to `O_(2), H_(2)O`, and most other corrosive agents in the environment. In this way objects made of `Al` form their own protective layers and need not be treted further to inhibit corrosion. However, acid rain ENDANGERS structural `Al` by dissolving this `Al_(2)O_(3)` (amphoteric oxide) coating.
Similarly `Ti` (which is often used tomake sports bikes) does not corrode becuase of a hard, impenetrable layer of `TiO_(2)` that adheres to the surgace and protects THEMETAL form further oxidation.
Discussion
6828.

Which of the following is an ester ?

Answer»

Soap
Seed oil
Glycerine
Kerosene oil

Answer :B
Discussion
6829.

What is flux? How is it useful ?

Answer»

Solution :Flux is a substance which combines with gangue (impurities) present in ROASTED ORE to form easily FUSIBLE material CALLED slag.
Flux + Gangue `to` Slag
Thus, flux helps to remove impurities from the roasted or calcinedore.
Discussion
6830.

When a glycine sol is prepared in NaOH the sol is

Answer»

Positive
Neutral
Negative
Can’t be said

Answer :C
Discussion
6831.

Which allotrope of sulphur is thermally stable at room temperature ?

Answer»

SOLUTION :Yellow rhombic SULPHUR is THERMALLY stable at ROOM temperature.
Discussion
6832.

We can drive any thermodynamically forbidden reaction in the desired direction by coupling with:

Answer»

HIGHLY EXOTHERMIC REACTION
highly enodthermic carbon
highly exergonic reaction
highly endergonic reaction

Answer :C
Discussion
6833.

What is the shortest wavelength in Bracket series of He^(+) spectrum ?

Answer»

`(100)/(9R_(H))`
`(16)/(R_(H))`
`(25)/(R_(H))`
`(9)/(R_(H))`

Solution :Shortest wavelength of Bracket series is correspond to `oo rarr 4` transition `n_(1) = 4, n_(2) = oo`
`(1)/(lambda_("min")) = R_(H) XX 2^(2) ((1)/(4^(2)) - (1)/(oo^(2))) rArr lambda_("min") = (4)/(R_(H))`
Discussion
6834.

Which is main component of starch ?

Answer»

GLUCOSE
Fructose
(A) and (B) both
Maltose

Solution :Glucose
Discussion
6835.

Which of the following is most solublein water ?

Answer»

Normal BUTYL ALCOHOL
isobutyl alcohol
Tertiary butyl alcohol
Secondary butyl alcohol

ANSWER :C
Discussion
6836.

Which compound will react with an aqueous solution of Ag(NH_3)_2^+ OH^-

Answer»

`CH_3 - C -= C - CH_3`
`CH_3CH_2C -= CH`
`CH_3-CH_3`
`CH_2=CH_2`

ANSWER :A
Discussion
6837.

Which of the following has highest solubility in water

Answer»

F
Br
Cl
I

Solution :Halogens are no polar molecules do not desolves in WATER `F_(2)` react with water REALITY FORMING mixture of `O_(2)` & `O_(3) : 2F_(2) + 2H_(2)O rarr 4HF + O_(2) , 3F_(2) + 3H_(2) Orarr 6 HF + O_(3)`
Discussion
6838.

Which of the following sets of compounds correctly ltbr. Illustrate the law of reciprocal proportions?

Answer»

<P>`P_(2)O_(3), PH_(3), H_(2)O`
`P_(2)O_(5), PH_(3), H_(2)O`
`N_(2)O_(5), NH_(3), H_(2)O`
`N_(2)O, NH_(3), H_(2)O`

Solution :
Similarly CHECK for other cases
Discussion
6839.

Which compound is generally used in making optical glasses such as Crooke's lenses which protect eyes against UV light ?

Answer»

Solution :LANTHANUM OXIDE `(La_(2) O_(3))`
Discussion
6840.

XePtF_6 (yellow solid) was prepared by J.Thomson. true/false

Answer»

SOLUTION :Berlettc
Discussion
6841.

The solution in which the light is scattered by the particles is :

Answer»

suspension
colloidal SOLUTION
true solution
NONE of these

Answer :B
Discussion
6842.

Which is cheaper : 40% hydrochloric acid at the rate of 50 paise per kilogram of 80%H_(2)SO_(4) at the rate of 25 paise per kilogram to completely neutralize 7 kg of caustic potash?

Answer»


SOLUTION :`underset(56kg)(KOH)+underset(36.5kg)(HCl)rarrKCl+H_(2)O`
`"PURE HCl required for 7 kg KOH "=(36.5)/(56)xx7=4.5625kj`
`40%" HCl acid required "=(100)/(40)xx4.5625=11.40625kg`
`"Cost "=11.40625xx50p=Rs.5.70p.`
`underset(2xx56kg)(2KOH)+underset(98kg)(H_(2)SO_(4))rarr K_(2)SO_(4)+2H_(2)O`
Proceed as above to calculate the cost of `80% H_(2)SO_(4).`
Discussion
6843.

The structure of the intermediate product formed by the oxidation of toluene with CrO_(3) and acetic anhydride, whose hydrolysis gives benzaldehyde is_____.

Answer»

SOLUTION :`C_(6)H_(5)CH(OCOCH_(3))_(2)`
Discussion
6844.

Vapour presure of chloroform (CHCI_(3)) and dichloromethane (CH_(2)CI_(2)) at 25^(@)C are 200 mm Hg and 41.5 mm Hg respectively Vapour pressure of the solution obtained by mixing 25.5 g or CHCI_(3) and 40g of CH_(2)CI_(2) at the same temperature will and 40 g of CH_(2)CI_(2) at the same temperature will be (("Molecular mass of" CHCI_(3) = 119.5 u and molecular mass 0 CH_(2)CI_(2) = 85 u)

Answer»

173.9 mm Hg
615.0 mm Hg
347.9 mm Hg
90.64 mm Hg

Solution :`p^(o)CHCI_(3) = 200 mm Hg, p^(o)CH_(2)CI_(2) = 41.5 mm Hg`
`"Moles of "CHCI_(3) "Mass"/"Molecular mass"=25.5/119.5 = 0.213`
`"Moles of " CH_(2)CI_(2) = 40/85 = 0.470`
`X_(CHCI_(3)) = 0.213/(0.213 + 0.470) = 0.31`
`X_(CH_(2)CI_(2))= 0.470/(0.213 + 0.470)=0.69`
`P_(T) = P^(o_(CHCI_(3))) X_(CHCI_(3)) + P^(o_(CH_(2)CI_(2)))X_(CH_(2)CI_(2)`
`P_(T) = 200 xx 0.31 + 41.5 xx 0.69 `
`P_(T) = 62 + 28.63 = 90.63`
Discussion
6845.

Which of the following series contains only electrophiles?

Answer»

`H_(2)O,SO_(3),H_(3)O^(+)`
`CH_(3)-CONH_(2)`
`CH_(3)CH_(2)OH`
`CH_(3)CH=CH_(2)`

Answer :C
Discussion
6846.

Which compound on reaction with ethyl magnesium bromide and water will form 2-methyl-2-butanol ?

Answer»

`C_(2)H_(5)COCH_(3)`
`CH_(3)COOCH_(3)`
`CH_(3)CH_(2)CHO`
`CH_(3)COCH_(3)`

ANSWER :D
Discussion
6847.

Which of the following numbers have same significant figures?

Answer»

0.06
0.6
6
60

Answer :A::B::C::D
Discussion
6848.

Which one of the following is used as a hypnotic?

Answer»

Acetaldehyde
Formalin
PARALDEHYDE
Formaldehyde

SOLUTION :Paraldehyde
Discussion
6849.

Which of the following can adsorb large volume of hydrogen gas?

Answer»

Finely divided PLATINUM
Finely divided nickel
Colloidal palladium
Colloidal platinum

SOLUTION :Order of adsorption of `H_(2)` (occulusion ) is colloidal palladium gt palladium gt platinum gt Gold gt nickel.
Discussion
6850.

Which of the following statements (are) correct ?

Answer»

Nitration of phenol is faster than PHENYL acetate.
Reaction of phenoxide ION is faster than para cyano phenoxide With `PhCH_(2)CL`.
Base catalysed hydrolysis of p-nitrophenyl acetate is faster than phenyl acetate.
Acid catalysed ESTERIFICATION of phenol is faster than p-nitro phenol.

Answer :A,B,C
Discussion