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1751.

The sugar present in fruits is

Answer»

Fructose
Glucose
SUCROSE
Galactose

Answer :A
Discussion
1752.

Which pair of species has same percentage of carbon?

Answer»

`CH_(3)COOH` and `C_(6)H_(12)O_(6)`
`CH_(3)COOH` and `C_(2)H_(5)OH`
`HCOOH_(3)` and `C_(12)H_(22)O_(11)`
`C_(6)H_(12)O_(6)` and `C_(12)H_(22)O_(11)`

Solution :Percentage of carbon in acetic acid `=(24)/(60)xx100=40%`
percentage of carbon in `C_(6)H_(12)O_(6)=(72)/(180)xx100=40%`
Discussion
1753.

Which of the following neutralisation reaction is most exothermic ?

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`NH_4OH`, HCL
`HCl,KOH`
`HCN, NaOH`
`CH_3COOH,NH_4OH`

ANSWER :B
Discussion
1754.

The repeating units of PTFEare:

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`Cl_(2)CH-CH_(3)`
`F_(2)C=CF_(2)`
`F_(3)C-CF_(3)`
`FClC=CF_(2)`

ANSWER :B
Discussion
1755.

Whichof the following statementis correct ?

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Ovalbum is a simplefood reservein egg - WHITE
Bloodproteins thrombinand fibrinogenare involvedin bloodclotting
DENATURATION makesprotein moreactive
Insulin maintainsthe sugarlevel of in THEHUMAN body

Answer :D
Discussion
1756.

When aniline is treated with benzene diazonium chloride at low temperature in weakly acidic medium the final product is

Answer»




SOLUTION :
Discussion
1757.

Write suitable chemical equations to show their natural.

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SOLUTION :(i) As `B_2O_3, SiO_2 and CO_2` are acidic in nature, they react with alkalis to form salts.
`B_2O_3 + 2NaOH underset("Sodium METABORATE")(to 2NaBO_2) + H_2O`
`SiO_2 + 2NaOH underset("Sodium silicate")(to Na_2SiO_3) + H_2O`
`CO_2 + 2NaOH underset("Sodium carbonate")(to Na_2CO_3) + H_2O`
(ii) `Al_2O_3 and PbO_2` reacts with both ACIDS and alklis as they are amphoteric in nature.
`Al_2O_3 and PbO_2` reacts with both acids and alkalis as they are amphoteric in nature.
`Al_2O_3+ 3H_2SO_4 to Al_2(SO_4)_3 + H_2O`
`underset("Alumina")(Al_2O_3) + 2NaoH underset("Sodium aluminate")(overset(Delta)to 2NaAlO_2) + H_2O`
`2PbO_2 + 2H_2SO_4 to 2PbSO_4 + 2H_2O + O_2`
`underset("Lead dioxide")(PbO_2) + 2NaOH underset("Sodium plumbate")(to Na_2PbO_3)to + H_2O`
(iii) `Tl_2O_3` reacts with acids as it is a BASIC oxide.
`Tl_2 O_3 + 6HCl to 2TlCl_3 + 3H_2O`
Discussion
1758.

The value of rate constant for a first order reaction is 2.303xx10^(-2)sec^(-1).What will be the time required to reduce the concentration to(1)/(10)th of its initial concentration?

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10 second
100 second
2303 second
230.3 second

Answer :B
Discussion
1759.

Which one of the following sulphides is yellow

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ZINC sulphide
Cadmium sulphide
Nickel sulphide
Led sulphide

Answer :B
Discussion
1760.

Which one of the following does not exhibit the phenomenon of mutarotation ?

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(-) Fructose
(+) Sucrose
(+) LACTOSE
(+) MALTOSE

Solution :Only monosaccharides , i.e., (-) -fructose , and REDUCING disaccharides , i.e., (+) -lactose and `(+)` - maltose , show MUTAROTATION, Since `(+)`- sucrose is a non -reducing sugar , it does not show mutarotation. THUS , option (b) is correct.
Discussion
1761.

The vapour pressure of pure benzene and pure toluene at a particular temperature are 100 mm and 50 mm repectively. The mole fration of benzene in the vapour phase in contact with equimolar solution os benzene and toluene is:

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0.67
0.75
0.33
0.5

Solution :For equimole solutions, `X_(B)=X_(f)=0.5`
`P_(B)=X_(B)xxP_(B)^(@)=0.5xx100=500mm`
`P_(T)=X_(T)xxP_(T)=0.5xx50-25 mm`
`"TOTAL vapour pressure "(P_("Total")=75MM`
Mole fraction of benzene in the vapour PHASE=
`P_(B)/_("Total")=50/75=2/3=0.67.`
Discussion
1762.

Which does not represent a concentration cell?

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`PT|H_(2)|HCl||CHl|Pt|H_(2)`
`Pt|H_(2)|HCl||Cl_(2)|Pt`
`Zn|Zn^(2+)||Cu^(2+)|Cu`
`Fe|Fe^(+2)||Cu^(2+)|Cu`

Solution :NET REDOX CHANGE is zero.
Discussion
1763.

Which of the following orders is correct regarding the basic strength of substituted aniline ?

Answer»

p-nitroaniline `GT` p-aminobenzaldehyde `gt` p-bromoaniline
p-nitroaniline `LT` p-bromoaniline `lt` p- aminobenzaldehyde
p- Nitroaniline `lt` p - aminobenzaldehyde `lt` p - bromoaniline
p - Nitroaniline `gt` p - aminobenzaldehyde `gt` p - bromoaniline

Solution :Electron domating groups `UARR b.c. uarr`
Discussion
1764.

Three-fourth of a reaction is completed in 32 minutes. What is the half life period of this reaction ?

Answer»

SOLUTION :16 MINUTES.
Discussion
1765.

Which of the following complex among the given options is not the hydrate isomer of others ?

Answer»

`[CO(H_(2)O)_(4)(NO_(2))_(2)]Cl_(2).H_(2)O`
`[Co(H_(2)O)_(3)(NO_(2))_(2)]Cl_(2).H_(2)O`
`[Co(H_(2)O)_(6)]Cl(NO_(2))_(2)`
NONE of these

Answer :B
Discussion
1766.

Which of the following is a 3^@ amine ?

Answer»

Triethylamine
t-butylamine
N-Methylaniline
Ethylamine

Answer :A
Discussion
1767.

What would the molecular of a gas have to be if the pressure of the gas is to fall one-half of its value in a vertical of a 1 metre ? (T = 25^(@)C). What type of molecules have molecular weight of this magnitude ?

Answer»

Solution :We have,
`2.303 log""(p)/(p_(0) = -(Mgh)/(RT)`
p = p(suppose)
`p_(0) = 2P`
`g = 981 cm//s^(2)`
h = 100 cm
`R = 8.314 xx 10^(7) erg. K^(-1)"mole"^(-1)`
`T = 25 + 273 = 298 K`.
`therefore 2.303 log""(P)/(2P) = (M xx 981 xx 100)/(8.314 xx 10^(7) xx 298)`
M = 17500
Molecules with such a high value of molecular weight must be those of a polymer.
Discussion
1768.

When NaCl is added to the reaction mixture of an oiland caustic soda, the soap is thrown out because

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NaCl is an IONIC compound
soap isinsoluble in the presence of chloride IONS
the SOLUBILITY product of NaCl DECREASES in the presence of soap
the solubility product of the soap is EXCEEDED due to the increased concentration of `Na^+` ions

Answer :D
Discussion
1769.

Which one of the following is employed as a Tranquillizer drug?

Answer»

Mifepristone
Promethazine
Valium
Naproxen

Answer :C
Discussion
1770.

The regular arrangement of the ions throughout the crystal is called a………………

Answer»

SOLUTION :CRYSTAL LATTICE
Discussion
1771.

The standard EMF of the cell: Ni|Ni^(2+)||Cu^(2+)|Cu, is 0.59 volt. The standard electrode potential (reduction potential) of copper electrode is 0.34 volt. Calculate the standard electrode potential of nickel electrode.

Answer»


Solution :`E_(CELL)^(@)=E_(CU^(2+)//Cu)^(@)-E_(NI^(2+)//Ni)^(@),therefore0.59=0.34-E_(Ni^(2+)//Ni)^(@)` or `E_(Ni^(2+)//Ni)^(@)=0.34-0.59=-0.25V`
Discussion
1772.

The structure of rhombic sulphur

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SOLUTION :
Discussion
1773.

Which of the following statement is correct? Galvanic cell converts

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METAL from its ELEMENT STATE changes to the combined state
Electrical energy into CHEMICAL energy
Electrolyte into identical ions
Chemical energy into electrical energy

Answer :D
Discussion
1774.

Ytterbium show +2 oxidation state, in which of the following configuration ?

Answer»

`F ^(0)`
`f ^(7)`
`f ^(14)`
`f ^(8)`

Answer :C
Discussion
1775.

Which can oxidise Br^- to Br_2

Answer»

`I^-2`
`Cl_2`
KI
HI

Answer :B
Discussion
1776.

Which of the following is used in dating archaeolo gical findings?

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`""_(92)^(235)U`
`""_(6)^(14)C`
`""_(1)^(3)H`
`""_(8)^(18)O`

Answer :B
Discussion
1777.

Which of the following reactions possess highest Delta Hvalue

Answer»

`CH_3Br to CH_3^(+) + Br^(-)`
`CH_3CH_2Br to CH_3CH_3^+`
`CH_3 - undersetoverset(|)(CH_3)(C )H - Br to CH_3-CH^(+) - CH_3 +Br^-`
`(CH_3)_3 C - Br to (CH_3)_3 C^(+) + Br^(-)`

Solution :ENERGY REQUIRE by aryl halide that forms stable carbocation (when C-X bond BREAKS) is less thanthe aryl halide that forms less stable carbocation `""^(+)CH_3`is stable more `Delta H`is required
Discussion
1778.

Three faradays electricity was passed through an aqueous solution of irono (II) romide. The weight of iron metal (at. At.=56) deposited at the cathode (in gm) is

Answer»

56
84
112
168

Solution :`FE^(2+)+2E^(-)TOFE,E_(Fe)=(56)/(2)=28`
`W_(Fe)=E_(Fe)xx"Number of faraday"=28xx3=84gm`
Discussion
1779.

Which metal is used for making dry cell ?

Answer»

Fe
Al
Zn
Mg

Answer :C
Discussion
1780.

Which prevent rancidity of fats

Answer»

ASPIRIN
butylated p-hydroxy anisole
saccharin
phenol

Answer :B
Discussion
1781.

Write the structure of the major organic product in each of the following reactions :C_(6)H_(5)ONa+C_(2)H_(5)Cl rarr

Answer»

Solution :`C_(6)H_(5)-O-C_(2)H_(5)`
Discussion
1782.

What is formed if calcium acetate is heated at 400^@C ?

Answer»

SOLUTION :ACETONE is FORMED
Discussion
1783.

Which of the following is/are aldol condensation?

Answer»

`CH_(3)CHO+CH_(3)CHO overset(OH^(-))to CH_(3)CHOHCH_(2)CHO`
`CH_(3)CHO+CH_(3)COCH_(3)overset(OH^(-))toCH_(3)CHOHCH_(2)COCH_(3)`
`HCHO+HCHO overset(OH^(-))to CH_(3)OH+HCOONa`
`C_(6)H_(5)CHO+C_(6)H_(5)CHO overset(OH^(-))toC_(6)H_(5)CH_(2)OH+C_(6)H_(5)COONA`

Answer :A::B
Discussion
1784.

Which of the following are electrophile?

Answer»

`CN^(-)`
`BF_(3)`
`NO_(2)^(+)`
`AlCl_(3)`

ANSWER :B::C::D
Discussion
1785.

Which of the following is a Heterocyclic compound.

Answer»





SOLUTION :`Heterocylic `RARR` at least ONE Hetroatom is present in the RING.
Discussion
1786.

Thermal decomposition of zinc nitrate gives:

Answer»

ZN
ZnO
`Zn(NO_2)_2`
NO

Answer :B
Discussion
1787.

Which of the following does not reduce Benedict's solution?

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Glucose
Fructose
SUCROSE
Aldehyde

SOLUTION :Sucrose being a non-reducing SUGAR does not REDUCE Benedict.s solution.
Discussion
1788.

X, Y, Z in the above reaction are

Answer»

CYCLOHEXANE, CYCLOHEXANOL, Cyclohexanoic acid
Cyclohexane, CYCLOHEXANONE, ADIPIC acid
Cyclohexane, Cyclohexanal, Cyclohexanoic acid
Cyclohexane, Cyclohexanone, Cyclohexanoic, Cyclohexanoic acid

Solution :
Discussion
1789.

Why are the ionization energies of 5 d elements than 3d elements ?

Answer»

SOLUTION :In the 5d series, after lanthanum `( Z= 57)` , there is langthanoid contraction.In each group, the SIZEOF 5d element is smaller while nuclear charge is greater than 3d element. Hence, IONIZATION ENERGIES of 5 delements are greater than 3d elements.
Discussion
1790.

Which of the following is FALSE regarding actinoids?

Answer»

ACTINOIDS show variable OXIDATION states due to the availability of 5f, 6D and 7s-orbitals.
Np and Pu exhibit `+7`oxidation state.
Nobelium is very STABLE in `+2` oxidation state due to `f^7`configuration.
When the oxidation number increases to `+6`, the actinoid ions form OXYGENATED ions.

Answer :C
Discussion
1791.

Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p).n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers (20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta-rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha-particleor by emitting a positron or by K-electron capture. ""_(13)^(27)Al is a stable isotope , ""_(13)^(29)Al is expected to disintegrate by-

Answer»

`ALPHA`-EMISSION
`BETA`-emission
positron emission
proton emission

Answer :B
Discussion
1792.

Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p).n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers (20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta-rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha-particleor by emitting a positron or by K-electron capture. beta-particle is emiited in radioactivity by

Answer»

CONVERSION of PROTON to NEUTRON
from outermost orbit
conversion of proton to neutron
`beta`-PARTICLE is not emitted

Answer :C
Discussion
1793.

Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p).n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers (20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta-rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha-particleor by emitting a positron or by K-electron capture. Consider the following nuclear reactions, ""_(92)^(238)M to _(y)^(x)N+2_(2)^(4)He, ""_(y)^(x)N to _(B)^(A)L+2beta^(+) The number of neutrons in the element L is

Answer»

`142`
`144`
`140`
`146`

ANSWER :B
Discussion
1794.

When during electrolysis of a solution of AgNO_(3) 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

Answer»

`10.8g`
`21.6g`
`108g`
`1.08g`

Solution :No. of MOLES of SILVER `= (9650)/(96500) =1/10` moles
`THEREFORE` MASS of silver deposited `=1/10 xx108 =10.8g`
Discussion
1795.

Which of the following gases is used for the welding

Answer»

Methane
Ethane
Acetylene
Ethene

Solution :`2CH-=CH+5O_2 to 4 CO_2 + 2 H_2O DeltaH =1300 KJ`
The combustion of acetylene is HIGHLY exothermic and the heat produced during the combustion can be USED for WELDING purposes in the form of oxy acetylene flame
Discussion
1796.

Which group is always taken as substituent in IUPAC nomenclature of compound ?

Answer»

`-NH_2`
-CN
`-NO_2`
-COOH

Answer :C
Discussion
1797.

To an acidified solution, a pinch of Na_(2)O_(2) is added and shaken. What is observed?

Answer»

Blue colour
Orange colour changing to green
COPIOUS EVOLUTION of oxygen
Bluish-green precipitate

Solution :`underset("orange")(Cr_(2)O_(7)^(2-))+10H^(+)+2Na_(2)O_(2) to (##BLJ_VKJ_ORG_CHE_C08_E04_013_S01##) +8Na^(+)+5H_(2)O`
In the absence of ether or amyl ALCOHOL, `CrO_(3)` in acidic medium decomposes to `Cr^(3+)` with evolution ofoxygen.
Discussion
1798.

What is trueaboutH _ 2S _ nO_ 6( polythionicacid)?

Answer»

TOTALS - S BOND =N
No. of S with 'O' state=n - 1
No. of S with+ 5 state=n - 2
No. of` d _(pi)-p _(pi)`bond=4

Answer :D
Discussion
1799.

There values of E_(0) of some reactions are given {:(I_(2),+,2e^(-),rarr,2I^(-),E_(0)=0.54"volts"),(Sn^(+4),+,2e^(-),rarr,SN^(2+),E_(0)=0.152"volts"),(Cl_(2),+,2e^(-),rarr,2Cl^(-),E_(0)=1.36"volts"),(Fe^(+3),+,e^(-) ,rarr,Fe^(2+),E_(0)=0.76"volts"),(Ce^(+4),+,e^(-),rarr,Ce^(3+),E_(0)=1.6 "volts"):} Hence

Answer»

`Fe^(3+)` oxidizes`Ce^(+3)`
`Ce^(4+` can OXIDIZE `Fe^(2+)`
`Sn^(2+)` will REDUCE `Fe^(3+)` to `Fe^(2+)`
`Cl_(2)` will be liberated from KCI by passing `I_(2)`.

Answer :B,C
Discussion
1800.

A hydride of nitrogen which is acidic in nature is :

Answer»

`NH_(3)`
`N_(3)H`
`N_(2)H_(2)`
`N_(2)H_(4)`

ANSWER :B
Discussion