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3501.

Which of the following are all disaccharides:

Answer»

MALTOSE, SUCROSE, LACTOSE
Maltose, lactose, glucose
Glycogen, lactose, sucrose
Starch, maltose, lactose

Answer :A
Discussion
3502.

Whichone of the followinggives bluecolourwithamyloseandpurplecolour withamylopectin ?

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Tollen' REAGENT
Fehling's solution
lodinesolution
Bromic WATER

ANSWER :C
Discussion
3503.

What is molarity of K^(+)in aqueous solution that contains 17.4 ppm of K_(2)SIO_(4)(174g"mol"^(-1))?

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`2xx10^(-2)M`
`2xx10^(-3)M`
`4xx10^(-4)M`
`2xx10^(-4)M`

SOLUTION :`17.4` ppm MEANS.
`implies17.4` gm per `10^(6)` parts
`implies17.4` mg per `10^(6)mg` water i.e. 1 L water.
`M=2xx(17.4xx10^(-3))/174xx1/1=2xx10^(-4)`
Discussion
3504.

underset"(Oxalic acid)"(H_2C_2O_4) oversetDeltato gas (A)+ gas (B) + liquid (C) Gas (A) burns with a blue flame and is oxidised to gas (B).Gas (B) turns lime water milky . Gas (A) + Cl_2 to (D) overset(NH_3 , Delta)to (E) A,B,C,D,E are respectively

Answer»

`CO_2 , CO, H_2O , HCOONH_2 , COCl_2`
`CO, CO_2 , COCl_2 , H_2O , HCOONH_2`
`CO, CO_2 , H_2O , COCl_2 , NH_2 CONH_2`
`CO,CO_2 , H_2O , NH_2CONH_2 , COCl_2`

SOLUTION :`H_2C_2O_4 oversetDeltato underset"(A)"(CO)+underset"(B)"(CO_2)+ underset"(C)"(H_2O)`
`underset"(B)"(CO_2)+underset"Lime WATER"(CA(OH)_2) to underset"MILKINESS"(CaCO_3)+H_2O`
`underset"(A)"(CO)+Cl_2 to underset"(D)"(COCl_2) underset"-2HCl"overset(2NH_3//Delta)to underset"(E)"(NH_2CONH_2)`
Discussion
3505.

Which of the following compounds can be detected by Molisch's test?

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Sugars
Amines
Primary ALCOHOLS
NITRO compounds

Solution :Molisch.s TEST is used for the DETECTION of CARBOHYDRATES.
Discussion
3506.

What is the emulsifier in milk

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Caesin
Gelatin
Albumin
Soap

Answer :A
Discussion
3507.

The value of log_(10)K for a reaction A hArr B is (Given: Delta_(f)H_(298K)^(Theta) =- 54.07 kJ mol^(-1), Delta_(r)S_(298K)^(Theta) =10 JK^(-1) mol^(-1), and R = 8.314 J K^(-1) mol^(-1)

Answer»

5
10
95
100

Answer :B
Discussion
3508.

What is the name of the reaction between ethanol and ethanoic acid?

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ESTERIFICATION
SAPONIFICATION
Etherification
HYDROXYLATION

SOLUTION :Esterification
Discussion
3509.

[X] + H_(2)SO_(4) rarr [Y] colourless gas with irritatingsmell [Y] + H_(2)SO_(4) + K_(2)Cr_(2)O_(7) rarr Greensolution [X] and[Y] are

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`SO_(3)^(2-),SO_(2)`
`CI^(Theta),HCI`
`S^(2-),H_(2)S`
`CO_(3)^(2-),CO_(2)`

SOLUTION :`[X]+ H_(2)SO_(4) rarr [Y]` colourless gas withirritating smell `[Y] + H_(2)SO_(4) rarr `Greensolution
Sulphite ionsgive sulphidedioxide gaswith sulpharic acid whichturn acidified potassiumdichromate to green
`SO_(3)^(2-) + H_(2)SO_(4) rarr SO_(2) + H_(2)O + SO_(4)^(2-)`
`3SO_(2) + K_(2)Cr_(2)O_(7) + H_(2)SO_(4) rarr K_(2)SO_(4) + underset(Green)((Cr_(2)(SO_(4))_(3))) + H_(2)O`
Discussion
3510.

Which has maximum number of unpaired electrons?

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`ZN^(2+)`
`Fe^(2+)`
`NI^(2+)`
`Cu^(2+)`

Answer :B
Discussion
3511.

Which of the following pair possess same volume?

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`ZR^(4+), HF^(4+)`
`Zn^(2+), Hf^(4+)`
`Fe^(2+), Ni^(2+)`
`Zr^(4+), TI^(4+)`

ANSWER :A
Discussion
3512.

Which group of metals is known as Pt-metals?

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FE,CO,Ni
Ag,AU,Cu
Zn,Cd,Hg
Ru,Rh,Pd

Answer :D
Discussion
3513.

Tritium emits:

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`alpha-rays`
`beta-rays`
`gamma-rays`
Neutrons

Answer :B
Discussion
3514.

Which is most reactive towards an electrophilic reagent-

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SOLUTION :PRESENCE of electron - donating group in the aromtic ringfacilitates electrophilic substitution. +R effect of -OH `("which is believed to exist partly as" - overset(-)(O)"group in aqueous solution")gt - OCH_(3)`. Hence , - OH group INCREASES the electron density of aromatic ring to a greater extent than `-OCH_(3)` group. Due to this reason compound ( c ) is most reactive towards electrophilic reagent.
Discussion
3515.

Which of the following is a paramagnetic molecules?

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`ClO_(2)`
`OC l_(2)`
`Cl_(2)O_(7)`
`OF_(2)`.

Answer :A
Discussion
3516.

What is the outer shell electronic configuration of chalcogens?

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SOLUTION :`ns^2 np^4` where N is the NUMBER of the OUTERMOST SHELL.
Discussion
3517.

The unit of entropy is

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`J MOL^(-1)`
`J K mol^(-1)`
`J K^(-1) mol^(-1)`
` J^(-1) K^(-1) mol^(-1)`

Answer :C
Discussion
3518.

The unit of electrochemical equivalent is

Answer»

SOLUTION :gram/coulomb
Discussion
3519.

The reduction alkyl cyandie withsodium andalcohol is called .

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Mendiusreduction
Clemmensomsreduction
Catalyticreduction
NONE of these

Solution :It is a Mendiusreductionwhichconvert - CN groupto `- CH_(2) - NH_(2)` GROUP.
Discussion
3520.

Which of the following has lowest knocking property

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Olefins
Straight CHAIN PARAFFINS
AROMATIC hydrocarbons
Branched chain paraffins

Answer :C
Discussion
3521.

The spin only magnetic moment of [MnBr_(4)]^(2-) is 5.9 BM. Predict the geometry of the complex ion.

Answer»

Solution :As the coordination number of `Mn^(2+)` in the given given complex is 4, the geometry can be either tetrahedral (`sp^(3)` hybridisation) or square planar (`dsp^(2)` hybridisation).
In `[MnBr_(4)]^(2-)`, Mn is in +2 state, i.e., its configuration is [Ar] `3d^(5).mu=5.9` BM means that the number of unpaired ELECTRONS in the complex = 5 (because `mu=sqrt(N(n+2)BM)`. Thus, all the five d-electrons REMAIN unpaired. Hence, the hybridisation will be `sp^(3)` (and cannot be `dsp^(3)`). THEREFORE, geometry is tetrahedral (and cannot be square planar).
Discussion
3522.

The standard electrode potentials of Zn, Ag and Cu are - 0.76 V, +0.80 V and +0.34 V respectively . Which is correct :

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Ag can OXIDISE ZN and CU
Ag can REDUCE Zn and Cu
Zn can reduce Ag and Cu
Cu can oxidise Zn and Ag

Answer :A
Discussion
3523.

Which factor will shift the following equilibrium in forward direction ?AgCl(s) rarr Ag^(+)(aq) + Cl^(-)(aq)

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Addition of`NH_(3)(AQ)`
Addition of`AgNO_(3)(aq)`
Addition ofNaCl(aq)
Addition ofAgCl(s)

Solution :`CO_(2)(G) + C(s) rarr 2CO(g)`
This is case of HETEROGENEOUS equilibrium.C(s) being SOLID is not considered.Total pressure of `CO_(2)` and CO GASES.
`P_(CO_(2)) + P_(CO) = P_(total)`
`0.5-p+2p = 0.8`
P = 0.3 atm
`P_(CO_(2)) = 0.5 - 0.3 = 0.2 atm`
`P_(CO) = 2p = 0.6 atm`
`K_(p) = P^(2)_(CO)/P_(CO_(2))= (0.6 xx 0.6 )/0.2 = 1.8 atm`
Discussion
3524.

Which of the following mineral does not contain Al?

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CRYOLITE
MICA
Feldspar
Fluorspar

ANSWER :D
Discussion
3525.

Which one of the following is an intermediate product in Stephen's reaction?

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AMINES
Amides
IMINES
Amino ACID

SOLUTION :Imines
Discussion
3526.

What are antifertility drugs ? Name the constituents of an oral contraceptive.

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Solution :Drugs used to check pregnancy in women to control birth rate. ORAL CONTRACEPTIVES contains a mixture of SYNTHETIC estrogen and PROGESTERONE DERIVATIVES.
Discussion
3527.

Which of the following spices is not a pseudo halide.

Answer»

`CNO^-`
`RCOO^-`
`OCN^-`
`N N N^-`

ANSWER :B
Discussion
3528.

Which of the following metal is highest electropositive (metallic) in nature?

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Be
Rb
Mn
Tl

Solution :RUBIDIUM is most electropositive in nature.
(a) `Cr:4s^(1)3d^(5)" `(each d-orbital has `1e^(-)`)
(b) `FE^(3+):4s^(0)3d^(5)`(each d-orbital has `1e^(-)`)
(c) `Cu^(+):4s^(0)3d^(10)`(each d-orbital has `2e^(-)`)
Discussion
3529.

Which of the following reaction does not yield an amine :

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`R-X+ NH_3`

`R-CN + H_2Ooverset (H^+) RARR`

ANSWER :C
Discussion
3530.

Which of the following is most corrosive salt chemical ?

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`FeCl_(2)`
`PbCl_(2)`
`Hg_(2)Cl_(2)`
`HgCl_(2)`

Solution :`HgCl_(2)` is a highly poisonous in nature. So it heats rapidly and so it corrod faster.
Discussion
3531.

Which of the following is a pair of functional isomers ?

Answer»

`CH_(3) COCH_(3) , CH_(3) CHO`
`C_(2) H_(5) CO_(2) H , CH_(3) CO_(2) CH_(3)`
`C_(3) H_(5) CO_(2) H , CH_(3) CO_(2) C_(2) H_(5)`
`CH_(3) CO_(2) H , CH_(3) CHO`

Answer :B
Discussion
3532.

What is the IUPAC name of H_(2)C = CH – CH_(2)OH ?

Answer»

Prop-2-en-1-ol
Prop-1-en-3-ol
1-Hydoxypropene
Allyl alcohol

Solution : Prop-2-en-1-ol
Discussion
3533.

Which of the following stateement are correct ?

Answer»

Ammonium salts on reaction with strong alkalies PRODUCE a non-inflamble gas
FAC-`[Co(NO_3)_3(dien)]` is non-chiral
Solid potassium dichromate and concentrated `H_2SO_4`liberates chlorine gas with solid sodium chloride
The increasing order of paramagnetic properties amongst`VCl_3, VOSO_4 , Na_3VO_4, [V(H_2O)_6]SO_4. H_2O` is `Na_3VO_4 lt VOSO_4 lt VCl_3 lt [V(H_2O)_6] SO_4. H_2O`

Solution :(A)`NH_4^(+)+OH^(-)toNH_3uarr+H_3O`
(B) The statement is correct ,non-chiral because there is mirror plane through the metal bisecting the dilen LIGAND.
(C )`4Cl^(-)(s)+Cr_(2)O_(7)^(2-)(s)+6H^(+)("conc.")to2CrO_2Cl_2uarr` (deep red) +`3H_2O(l)`
(D)`VCl_3 , ._23V^(3+), [Ar]^(18)3d^(2)`=2 unpaired electrons
`VO^(2+) , V^(4+) , [Ar]^(18)3d^(2)`=1 unpaired electron
`[VO_4]^(3-) , V^(3+), [Ar]^(18)3d^(0)`=no unpaired electron
`[V(H_2O)_6]^(2+), V^(2+), [Ar]^(18)3d^3`=3 unpaired electrons
Discussion
3534.

Write the IUPAC names of the following compounds:

Answer»

SOLUTION :.
Discussion
3535.

Which of the following is not an example of organochlorine which shows biomagnification?

Answer»

Endrin
DDT
`HClO_4`
Dieldrin

Answer :C
Discussion
3536.

Which are the properties of sols ?

Answer»

Adsorption
Tyndall effect
Flocculation
Paramagnetism

Answer :A::B::C
Discussion
3537.

Which of the following statement regarding difference between lithium and other alkali metals is incorrect ?

Answer»

Lithium is MUCH softer than other alkali metals.
Unlike other alkali metals, it forms `Li_(2)O` mainly in air.
Lithium nitrate on heating gives `Li_(2)O` whereas other alkali metal nitrates decompose to give CORRESPONDING nitrites.
LiF and `Li_(2)O` are COMPARATIVELY less SOLUBLE in water than corresponding COMPOUNDS of other alkali metals.

Answer :A
Discussion
3538.

The specific conductivity of N/50 solution of KCl at 298 K is 0.002765 S cm^(-1). If the resistance of the same solution placed in the cell is 2000 ohms, what is cell constant?

Answer»


SOLUTION :CELL CONST.`kappa//G=kappaxxR`.
Discussion
3539.

Which of the following does not give N - ethyl cyclopentylamine as major product?

Answer»




SOLUTION :
Discussion
3540.

Which of the following is not correct with respect to bond length of the species ?

Answer»

`C_(2)gt C_(2)^(2-)`
`B_(2)^(+)gt B_(2)`
`N_(2)^(+)gt N_(2)`
`O_(2)gt O_(2)^(-)`

Solution :Bond ORDERS :
`C_(2)=2, C_(2)^(2-)=3, B_(2)^(+)=0.5, B_(2)=1`
`Li_(2)^(+)=0.5, Li_(2)=1, N_(2)^(+)=2.5, N_(2)=3, O_(2)=2.0, O_(2)^(-)=1.5`.
Discussion
3541.

Which of the following reactions is not associatedwith the Solvay process of manufacture of sodium carbonate?

Answer»

`CO_2+ H_2O to H_2CO_3`
`NH_3 + H_2CO_3 to NH_4HCO_3`
`NACL+ NH_4HCO_3 to NaHCO_3 + NH_4Cl`
`2NAOH + CO_2 to Na_2CO_3 + H_2O`

ANSWER :D
Discussion
3542.

Which of the following is not ture for a lithium battery?

Answer»

Lithium METAL is the anode
`TiS_(2)` is the cathode
Molten `LI` SALT is the electrolyte
During operation, `Li^(+)` ions migrate thorugh the electro-lyte from the anode to the cathode while ELECTRONS flow externally from the anode to the cathode to complete the circuit.

Solution :`Li` BATTERY is a solid state battery because the electrolyte is made of a polymer material that permits the passage of ions but not of electrons.
Discussion
3543.

Which of the following metals acts as a sacrificial anode for iron articles ?

Answer»

Cu
Zn
Ag
SN

ANSWER :B
Discussion
3544.

The value of B in Debye-Huckel and Onsager equation is ……………. .

Answer»

`B = (8.20 xx 10^5)/(3sqrt(DT))`
`B = (8.20 xx 10^(-5))/(sqrt(DT))`
`B = (82.4)/(sqrt(DT)ETA)`
`B = (82.4)/(3sqrt(DT))`

ANSWER :A
Discussion
3545.

Which of the following is obtained when 1-halobutane is heated withAgNO_(2)

Answer»




ANSWER :A
Discussion
3546.

Which of the following is diamagnetic and tetrahedral ?

Answer»

`[Ni(CN)_(4)]^(2-)`
`[NiCl_(4)]^(2-)`
`[Ni(CO)_(4)]`
both (B) and (C )

Answer :C
Discussion
3547.

Which of the following pair is correctly matched

Answer»

CURTIUS REACTION,CARBOXYLIC acid
Hoffmann rearrangement hydrazoic acid
Schmidt reaction-carboxylic acid
Lossen rearrangement acid chloride

Answer :C
Discussion
3548.

Which one of the following pairs of complexes has the effective atomic number equal to 36 for the transition element ?

Answer»

`[CO(NH_(3))_(6)]Cl_(3):K_(3)[Fe(CN_(6))]`
`[Co(NH_(3))_(6)]Cl_(3):[Co(Co)_(4)]
`[Fe(CO)_(5)],K_(4)[Fe(CN)_(6)]`
`[Fe(CO)_(5)],K_(3)[Fe(CN)_(6)]`

Answer :C
Discussion
3549.

The shapes of MnO_(4)^(-) ion and the hybridization of Mn in MnO_(4)^(-) is :

Answer»

TETRAHEDRAL, `SP^(3)`
tetrahedral, `d^(3)s`
square planar , `dsp^(2)`
square planar , `sp^(3)`

Answer :B
Discussion
3550.

Write the structure of the product obtained when glucose is oxidised with nitric acid.

Answer»

SOLUTION :
Discussion