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5951.

Which of the following group of molecules can act both as oxidant as well as reductant :-

Answer»

`KM nO_(4), O_(3), SO_(3)`
`HClO_(4), HNO_(3), H_(2)O_(2)`
`HNO_(3), SO_(2), O_(3)`
`HNO_(2), SO_(2), H_(2)O_(2)`

Answer :D
Discussion
5952.

Write the IUPAC name of the following : (CH_(3))_(2)C=CHCOCH_(3)

Answer»

SOLUTION :2 - Methylpent -3- ENE -2- ONE.
Discussion
5953.

To prepare 2-propanol from methyl-magnesium bromide, the other chemical required is

Answer»

HCHO
`CH_(3)CHO`
`C_(2)H_(5)OH`
`CH_(3)COCH_(3)`

ANSWER :B
Discussion
5954.

Which of following amines form N-nitroso derivative when treated with NaNO_(2) and HCI.

Answer»

`CH_(3)NH_(2)`


SOLUTION :Nitrosomine TEST for `2^(@)` amines
Discussion
5955.

The reagent X in the reactions (CH_3)_3C CH=CH_2 underset"THF"oversetX toY underset"NaOH"overset(NaBH_2)to (CH_3)_3-undersetunderset(OH)(|)C-CH-CH_3

Answer»

`H_3O^+`
`HG(CH_3COO)_2`
`OH^-`
HCOOH

Solution :Oxy mercuation-demercuration : with mercuricacetate (in THF) followed by reduction with `NaBH_4//NaOH` is an EXAMPLE of hydration of alkene according to MARKOWNIKOFF's rule
Discussion
5956.

The volume of gas is reduced to half from its original volume. The specific heat will

Answer»

reduced to half
be doubled
remain constant
increased four times

Solution :The specific HEAT of a SUBSTANCE is the heat required to RAISE the temperature of 1 GRAM of a substance by one degree `(1 K or 1^(@)C)`. It is an intensive property and is independent of the volume of the substance.
Discussion
5957.

When petroleum is heated the vapours contain mainly

Answer»

Kerosene
Petroleum ether
Diesel
Machine oil

Solution :DUE to its LOWEST BOILING POINT
Discussion
5958.

What is the maximum number of steroisomers possible for each compound? (a) CH_(3)CH(OH)CH(OH)CH_(2)CH_(3) (b) CH_(3)CH_(2)CH_(2)CH(CH_(3))_(2)

Answer»


ANSWER :`(##GRB_CHM_ORG_HP_C02_E01_316_A01##)`
Discussion
5959.

What happens when PCl_5 is heated?

Answer»

SOLUTION :On HEATING `PCL_5` DECOMPOSES to FORM `PCl_3` and `Cl_2PCl_5iffPCl_3+Cl_2`
Discussion
5960.

Which property of colloidal solution is independent of charge on the colloidal particles ?

Answer»

Electro-osmosis
Tyndall EFFECT
Coagulation
Electrophores

SOLUTION :Tyndall effect is scattering of LIGHT by COLLOIDAL PARTICLES which is independent of charge on them.
Discussion
5961.

Which of the following compounds do not rotate the plane of polarised light in a particular direction? 3-chloropentane (I), 2-bromooctane (II), (+-)-lactic acid (III), N-ethyl-N-methylpropan-1-amine(IV), meso-tartaric acid (V).

Answer»

SOLUTION :I, III, IV and V.
Discussion
5962.

The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by 7^(@)C. The gas is - (R=8.3Jmol^(-1)K^(-1))-

Answer»

a MIXTURE of MONOATOMIC and diatomic
monoatomic
diatomic
triatomic

Answer :C
Discussion
5963.

Total number of atoms present in 25mg of camphor. C_(10)H_(18)O is:

Answer»

`2.57xx10^(21)`
`9.89xx10^(19)`
`2.67xx10^(21)`
`6.02xx10^(20)`

ANSWER :C
Discussion
5964.

What should be the correct IUPAC name for diethylbromomethane?

Answer»

1-Bromo-1, 1-diethylmethane
3-BROMOPENTANE
1-Bromo-1-ethylpropane
1-Bromopentane

Solution :`overset(5)(C)H_(3)overset(4)(C)H_(2)-overset(4)(C)HBr-overset(2)(C)H_(2)overset(1)(C)H_(3)` - bromopentane.
Discussion
5965.

Which of the following is most stable diazoniom salt ?

Answer»

`CH_(3)N^(+)_(2)X^(-)`
`C_(6)H_(5)N^(+)_(2)X^(-)`
`CH_(3)CH_(2)N^(+)_(2)X^(-)`
`C_(6)H_(5)CH_(2)N^(+)_(2)X^(-)`

Answer :B
Discussion
5966.

What type of colloids is formed when gas is despersed in a liquid ? Given an example.

Answer»

SOLUTION :From, e.g., FORTH.
Discussion
5967.

What is nickel-cadmium cell ? State its one merit and one demerit over storage cell. Write the overall reaction that occurs during discharging of this cell.

Answer»

Solution :Nickel-cadmium cell is a SECONDARY cell and it is rechargeable.
Merit : It has a longer life than the storage cell.
Demerit : It is more EXPENSIVE to MANUFACTURE.
The overall reaction when the discharging takes place is as under :
`Cd(s) + 2Ni(OH)_(3) to CDO (s) + 2Ni(OH)_(2) (s) + H_(2)O (L)`
Discussion
5968.

When acetic acid reacts with calcium , a gas is evolved . The gas is :

Answer»

`H_(2)`
`CO_(2)`
CO
`N_(2)`.

Solution :`2CH_(3)COOH+Cato(CH_(3)COO)_(2)Ca+H_(2)`
Discussion
5969.

The vapour pressure of a solvent in a solution is lower than that of pure solvent, at the same temperature. A higher temperature is needed to raise the vapour pressure up to the atmospheric pressure, when boiling begins. However, increase is small, like 0.1 "mol"kg^(-1) aqueous sucrose solution boils at100.05^(@)C. Sea water, an aqueous solution, which is rich inNa^(+) andCl^(-) ions, freezes about 1^(@)C lower than frozen water. At the freezing point of a pure solvent, the rates at which two molecules stick together to form the solid and leave it to return to liquid state are equal when solute is present. Fewer solvent molecules are in contact with surface of solid. However, the rate at which the solvent molecules leave the surface of solid remains unchanged. That is why temperature is lowered to restore the equilibrium. The freezing point depression in an ideal solution is proportional to molality of the solute. The freezing point of benzene solution was 5.4^(@)C. The osmotic pressure at 10^(@)C is (freezing point of pure benzene =5.5^(@)C) (K_(f) for benzene =5.12^(@) kg"mol"^(-1), assume molality of molarity of benzerne solution)

Answer»

0.25 atm
0.45 atm
0.65 atm
0.85 atm

Solution :`PI=((DeltaT_(F))/(K_(f)))R.T.implies{:(T=283K)/(R=0.0821):}`
Discussion
5970.

Which one of the following does not get oxidised by bromine water

Answer»

`Fe^(+2)` to `Fe^(+3)`
`CU^(+)` to `Cu^(+2)`
`MN^(+2)` to `MnO_(4)^(-)`
`Sn^(+2)` to `Sn^(+4)`

Answer :C
Discussion
5971.

The vapour pressure of a solvent in a solution is lower than that of pure solvent, at the same temperature. A higher temperature is needed to raise the vapour pressure up to the atmospheric pressure, when boiling begins. However, increase is small, like 0.1 "mol"kg^(-1) aqueous sucrose solution boils at100.05^(@)C. Sea water, an aqueous solution, which is rich inNa^(+) andCl^(-) ions, freezes about 1^(@)C lower than frozen water. At the freezing point of a pure solvent, the rates at which two molecules stick together to form the solid and leave it to return to liquid state are equal when solute is present. Fewer solvent molecules are in contact with surface of solid. However, the rate at which the solvent molecules leave the surface of solid remains unchanged. That is why temperature is lowered to restore the equilibrium. The freezing point depression in an ideal solution is proportional to molality of the solute. The freezing point iof a 5% by mass CH_(3)COOH (aq.) solutin is -1.8^(@)C. Th vasn't Hoff factor is (K_(f) of water =1.86)

Answer»

1.1
1.2
1.3
None of the above

Solution :`DeltaT_(F)=iK_(f)mimplies1.8=ixx1.86xx(5//60)/(95xx10^(-3))`
`i=1.1`
Discussion
5972.

The vapour pressure of a solvent in a solution is lower than that of pure solvent, at the same temperature. A higher temperature is needed to raise the vapour pressure up to the atmospheric pressure, when boiling begins. However, increase is small, like 0.1 "mol"kg^(-1) aqueous sucrose solution boils at100.05^(@)C. Sea water, an aqueous solution, which is rich inNa^(+) andCl^(-) ions, freezes about 1^(@)C lower than frozen water. At the freezing point of a pure solvent, the rates at which two molecules stick together to form the solid and leave it to return to liquid state are equal when solute is present. Fewer solvent molecules are in contact with surface of solid. However, the rate at which the solvent molecules leave the surface of solid remains unchanged. That is why temperature is lowered to restore the equilibrium. The freezing point depression in an ideal solution is proportional to molality of the solute. Whene 250 m,g of eugenol is added to 100 gm of camphor (K_(f)=37.9), it lowered the freezing point by 0.62^(@)C, the molar mass of eugenol is

Answer»

`1.6xx10^(2)`gm/mole
`1.6xx10^(4)` gm/mole
`1.6xx10^(3)` gm/mole
200 gm/mole

Solution :`M_("SOLUTE")^(@)=(W_("solute")xxK_(F)xx1000)/(W_("solvent")xx(DeltaT_(f)))`
Discussion
5973.

The vapour pressure of a solvent in a solution is lower than that of pure solvent, at the same temperature. A higher temperature is needed to raise the vapour pressure up to the atmospheric pressure, when boiling begins. However, increase is small, like 0.1 "mol"kg^(-1) aqueous sucrose solution boils at100.05^(@)C. Sea water, an aqueous solution, which is rich inNa^(+) andCl^(-) ions, freezes about 1^(@)C lower than frozen water. At the freezing point of a pure solvent, the rates at which two molecules stick together to form the solid and leave it to return to liquid state are equal when solute is present. Fewer solvent molecules are in contact with surface of solid. However, the rate at which the solvent molecules leave the surface of solid remains unchanged. That is why temperature is lowered to restore the equilibrium. The freezing point depression in an ideal solution is proportional to molality of the solute. An aqueous solution of 0.1 "mol" kg^(-1) concentration of sucrose should have freezing point of (K_(f)=1.86)

Answer»

`-0.186^(@)C`
`1.86^(@)`
`0.186^(@)C`
`-1.86^(@)C`

SOLUTION :`DeltaT_(F)=mk_(f)=0.1xx1.86=0.186`
`T_(f)=-0.186`
Discussion
5974.

When Zn piece is kept inCuSO_4 solution copper gets prectipitated because :

Answer»

STANDARD reduction potential of zinc is more than copper
Standard reduction potential of zinc is less than copper
Atomic NUMBER of zinc is LARGEST than copper
Atomic number of zinc is LOWER than copper

Answer :B
Discussion
5975.

What are general anaesthetics? Give example.

Answer»

Solution : (i) General ANAESTHETICS are drugs cause a CONTROLLED and reversible loss of consciousness by AFFECTING central NERVOUS system. e.g., propofol, iso flurane.
(ii) They are often used for MAJOR surgical procedures.
Discussion
5976.

The salt bridge contains a agar-agar gel mixed with an inert electrolyte such as .............................. .

Answer»

SOLUTION :`KCL (or) Na_2SO_4`
Discussion
5977.

What would be the height of column in barometer if water ("density" = 1000 Kg//m^(3)) is used instead of mercury for measuring atmospheric pressure?

Answer»

Solution :Density of MERCURY if `13.56 g//cm^(3)` and density of water is `1g//cm^(3)`. Using pascal’s LAW we can SAY `rho_(1)gh_(1)= rho_(2)gh_(2)` which MEANS `13.56 xx (9.8) xx 76 = 1× (9.8)xx h_(2)`. Here, `h_(2) = 1030.56` cm
Discussion
5978.

Which of the following species will be least stable?

Answer»




SOLUTION :
Discussion
5979.

The secondary valency of platinum in tetraamminedichloroplatinum (IV) chloride is :

Answer»

`+4`
`+2`
3
6

Solution :Secondary VALENCY corresponds to the coordination number of the CENTRAL metal atom or ion . Pt (IV) in `[Pt (NH_(3))_(4) Cl_(2) ]Cl_(2)` i.e., tetrammine dichloro-platinum (IV) chloride have coordination number (i.e., secondary valency) six .
Discussion
5980.

Write the aromatic structures of all isomers with the formula C_7H_8O.

Answer»

Solution :There are FIVE aromatic STRUCTURAL ISOMERS for the formula `C_7H_8O`.
Discussion
5981.

Which reagent is not used to replace -OH group from alcohol by -Cl atom ?

Answer»

`PCl_(5)`
`SOCl_(2)`
`PCl_(3)`
`Cl_(2)`

Answer :D
Discussion
5982.

What are the ultimate products of digestion of proteins?

Answer»

SOLUTION :AMINO ACIDS.
Discussion
5983.

What is the formula of the first noble gas compound prepared by N.Bartlett?

Answer»

SOLUTION :`XePtF_6`
Discussion
5984.

Which of the following factors may be regarded as the cause of lanthanoid contraction ?

Answer»

Effective shielding of one Jr4/electrons by another in subshell.
Poor shielding of one of 4f electrons by another in the subshell.
Increase in NUCLEAR CHARGE outweighs the imperfect shielding by /-electrons.
Poorer shielding of 5D electrons by 4/electrons.

Solution :On account of the very diffused shapes of f - orbitals, 4f electrons shield each other QUITE POORLY from the nuclear charge.
Discussion
5985.

Which of the following is not correct description?

Answer»

`SO_(2)-sp_(2)` hybridised sulphur - angular shape - one LONE pair over sulpur - one `(dpi-p PI)` and one `(p pi-p pi)` bond
`SO_(3)^(2-)-sp^(3)` hybridised sulphur - PYRAMIDAL shape - one `(dpi-p pi)` bond
`SO_(4)^(2-)-sp^(3)` hybridised sulphur - TETRAHEDRAL shape - TOW `(dpi-p pi)` bonds
`SO_(3)-sp^(3)` hybridised sulphur-planar triangle shape - two `(p pi=p pi)` and one `(dpi-p pi)` bonds

Answer :D
Discussion
5986.

Which of the following complex compounds is not coloured

Answer»

`Na_2[CuCl_4]`
`Na_2[CdCl_4]`
`K_4[FE(CN)_6]`
`K_3[Fe(CN)_6]`

ANSWER :B
Discussion
5987.

Which of the following componds undergoes hydrolysis to form propyne

Answer»

`Al_4C_3`
`Mg_2C_3`
`B_4C`
`La_4C_3`

ANSWER :B
Discussion
5988.

What happens when acetaldehyde reacts with Fehling.s solution ?

Answer»

Solution :A RED precipitate of cuprous oxide will be FORMED.`CH_3CHO+2Cu(OH)_2+NaOHrarrCH_3COONa+Cu_2O+3H_2O'
Discussion
5989.

Which of the following aquated metal ions has the highest paramagnetism?

Answer»

`[CR(H_(2)O)_(6)]^(3+)`
`[Fe(H_(2)O)_(6)]^(2+)`
`[CU(H_(2)O)_(6)]^(3+)`
`[ZN(H_(2)O)_(2)]^(2+)`

ANSWER :B
Discussion
5990.

The units of molality are

Answer»

`"moles. Lit"^(-1)`
`"moles. ML"^(-1)`
`"moles.Kg"^(-1)`
`"G equivalents kg"^(-1)`

ANSWER :C
Discussion
5991.

Which of the following isare) considered as an organometallic compound :

Answer»

Zeise's SALT
Ferrocene
cis-platin
Grignard reagent

Solution :Cis- platin is the cis isomer of `[Pt(NH_(3))_(2)Cl_(2)]` compounds with direct metal CARBON bonds are organometallics.
Discussion
5992.

Which halogen formsan oxyacid that containsthe halogenatom in tripositiveoxidation state?

Answer»

fluorine
chlorine
BROMINE
LODINE

SOLUTION :The oxyacid of chlorineatom has tripositiveoxidation state ofCI
e.g `HCIO_(2)` , cI is in +3 oxidation state
Discussion
5993.

Ultra filtration is the process of separating colloidal particles from the solvent and soluble solutes by

Answer»

centrifugation.
ultraviolet RADIATIONS.
SPECIALLY PREPARED FILTERS.
None of these

Solution : specially prepared filters.
Discussion
5994.

Write equations for the prepration of NaHCO_3?

Answer»
Discussion
5995.

Which antibiotic is supposed to be toxic towards certain strains of cancer cells ?

Answer»

SOLUTION :SULPHITE.
Discussion
5996.

Which of the following statements are true with respect to DNA ?

Answer»

SUGAR COMPONENT of nucleotide is deoxyarabinose
Sugar component of a nucleoside is deoxyribose.
In nucleotides, the base is attached to sugar moiety by PHOSPHODIESTER LINKAGE.
The sugars of DNA have L-configuration.

SOLUTION :Sugar component of nucleotide is deoxyribose.
Discussion
5997.

Which of the following is a natural fibre?

Answer»

Starch
CELLULOSE
Rubber
Nylon-6

Solution :Cellulose
Discussion
5998.

Which of the following is an example of homogeneous catalysis reaction? 1) 2SO_(2(g))+O_(2(g))overset(NO_((g)))to2SO_(3(g)) 2) Hydrolysis of aqueous sucrose solution in the presence of aquesous mineral acid 3) 2H_(2)O_(2(1))overset(Pt_((s)))to2H_(2(1))+O_(2(g)) 4) Hydrolysis of liquid ester in the presence of aqueous mineral acid

Answer»

2 and 4
2 and 3
1, 2 and 3
1, 2 and 4

Answer :D
Discussion
5999.

Which of the following metals present as impurity passes into solution during electrorefining of copper ?

Answer»

Zinc
Silver
Gold
Platinum.

SOLUTION :Zinc present as IMPURITY passes into the solution SINCE it is more REACTIVE than COPPER.
Discussion
6000.

Which one of the following reaction would produce secondary alcohol?

Answer»

`C_(6)H_(5)overset(O)overset(||)C CH_(3)overset(1.CH_(3)MgBr)underset(2.H^(+))rarr`
`C_(6)H_(5)overset(O)overset(||)C CH_(3)overset(1.LiAlH_(4))underset(2.H^(+))rarr`
`CH_(3)CHOoverset(LiAlH_(4))rarr`
`CH_(3)overset(O)overset(||)C CH_(3)overset(1.OH^(-))underset(2.Br_(2))rarr`

ANSWER :B
Discussion