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17501.

Whichofthefollowingdissolves in ionicsolvents ?

Answer»

`C _6 H_6`
`CH _3 OH `
`C Cl_4`
`C _ 5H _( 12 ) `

Solution :Methanol `(CH _3 OH ) `is solubleinwaterduetoformation ofH -bondbetweenwatermoleculeandmethanol.
Discussion
17502.

Which of the following exhibit geometrical isomerism (M stands for a metal, and a and b are achiral ligands)?

Answer»

`Ma_(2)b_(2)`
`Ma_(2)b_(4)`
`Ma_(5)b`
`Ma_(6)`

Answer :A::B
Discussion
17503.

Which of the following is the unit of eq. conductance ?

Answer»

MHO
mho `CM^(2)`
mho `cm^(-1)`
mho `cm^(-2)`

ANSWER :B
Discussion
17504.

Which of the following reaction will give 1-methoxy -4-nitrobenzene. (a) 4-nitro -1-bromobenzene + sodium methoxide. (b) 4-nitrosodium phenoxide + bromomethane

Answer»

Solution :(a)
(B)
REACTION (A) will not occur since ethers cannot be prepared by treating bromobenzene or iodobenzene with sodium salt of the CORRESPONDING alcohol like sodium methoxide or ethoxide. This is due to the reason aryl halides are much LESS reactive them allayl halides towards NUCLEOPHILIC substitution reaction.
Discussion
17505.

Which of the following is a mismatch :

Answer»

LYOPHILIC COLLOIDS - reversible sols
Associated colloids - micelles
Tyndall effect - SCATTERING of light by colloidal particle
Electrophoresis - movement of dispersion medium under the INFLUENCE of electric field

Solution :Electrophoresis means movement of colloidal PARTICLES under the influence of electric field.
Discussion
17506.

Which of the following statement is not correct

Answer»

CAPROLACTAM is the monomer of nylon-6
Terylene is the monomer of nylon-6
Phenol formaldehyde resin is KNOWN as bakelite
The monomer of natural rubber is BUTADIENE

Answer :D
Discussion
17507.

Whichof the followingreactionsdoes notyieldan amine ?

Answer»

`RX + NH_(3) to `
`RCH= N-OH + H_(2) overset(Ni)to`
`RCN + H_(2) O overset(H^(+))to`
`R-NO_(2) + 4Hoverset(SN + conc.HCl) to `

Solution :Alkylcyanide on acidhydrolysisgivescarboxylicacids.
Discussion
17508.

Write the IUPAC name of following complexes.[Fe(CO)_5]

Answer»

SOLUTION :PENTA CARBONYL IRON (O)
Discussion
17509.

Which molecule has tetrahedral geometry

Answer»

`[CO(NH_3)_6]^(3+)`
`[NI(CN)_4]^(2+)`
`FE(CO)_5`
`[NiCl_4]^(2-)`

ANSWER :D
Discussion
17510.

What is isoelectric point ?

Answer»

SOLUTION :It is the PH of the solution at which there is no NET migration of water ION to an electrode when an ELECTRIC current is passed through it .
Discussion
17511.

Which of the following dissolves in both KCN and NH_3to form a complex ?

Answer»

`CaCl_2`
`AgCl `
`FE(OH)_3`
`PbCl_2`.

ANSWER :B
Discussion
17512.

When acetone is treated with ""^(18)O labeled water and isolating the product after attaining equilibriumgives the product with -------------- number of isotopic oxygen/s.

Answer»


Solution :`CH_3- OVERSET(O ) overset(||)C-CH_3+H_2 O^(18) overset("Tautomerisation")tocH_3- overset(OH) overset(|)C=CH_2 ` onlyoneisotopeof.o.is PRESENT
Discussion
17513.

Whatare elastomers ? Writethe chemical equation to representthe preparation of Buna - S.

Answer»

SOLUTION :Elastomers : Polymers in whichpolymericchainsare heldtogether by theweakestintermoleuclarforces. They can be stretched DUETO weak forces of attraction . On releasingthe forces, they attain the originalposition . Buna - S can be prepared by reactionof 1,3-butadiene andstyreneinpresenceof sodium as polymerising agent.
`underset("Buta-1,3-diene")(nCH_(2))=CH- CH_(2) +underset("Styrene")underset(C_(6)H_(5))underset(|)(NCH) = CH_(2) overset(NA) to underset("Buna-S")((-CH_(2) - CH =CH-CH_(2) - underset(C_(6)H_(5))underset(|)(CH) - CH_(2)-)_(n)`
Discussion
17514.

Which of the following is least soluble in water at 298 K?

Answer»

`CH_(3)NH_(2)`
`(CH_(3))_(3)N`
`(CH_(3))_(2)NH`
`C_(6)H_(5)NH_(2)`

Solution :(d): Aromatic AMINES are insoluble in WATER. This is due to the larger hydrocarbon PART which tends to retard the FORMATION of H-bond.
Discussion
17515.

Which of the two have almost similar size :

Answer»

`"_22Ti` and `" _40Zr`
`"_41Nb` and `"_73Ta`
`"_39Y` and `"_57La`
`"_20Ca` and `"_31Ir`

ANSWER :B
Discussion
17516.

Two reactions r_(1) and R_(2) have indentical prexponential factors.Activation energy of R_(1) exceeds that of R_(2) by 10 KJ mol^(-1) .If K_(1) and k_(2) are rate constants for reaction R_(1) and R_(2) respectively at 300 K,then ln (K_(2)//K_(1)) is equal to ..........(R=8.314 J mol^(-1)K^(-1))

Answer»

8
12
6
4

Solution :`k_(1)=AE^((-Ea_(1))/(RT)),k_(2)Ae^((-(Ea_(1)-10))/(RT)`
in `[(k_(2))/(k_(1))]=(10)/(RT)=(10)/(8.314xx10^(-3)xx300)=4`
Discussion
17517.

Which has the maximum m.p. ?

Answer»

NaCl
NaF
NaBr
NaI

Answer :B
Discussion
17518.

Which of the following compounds is most reactive towards SN^1reaction

Answer»




Solution :`SN^1`reaction is FAVOURABLE only when STABLE carbocation FORMED as intermediate
Discussion
17519.

Which of the following will not be soluble in sodium hydrogen carbonate ?

Answer»

BENZOIC ACID
o-Nitrophenol
Benzenesulphonic acid
2,4,6-trinitrophenol

Answer :B
Discussion
17520.

Who prepared the first noble gas compound?

Answer»

SOLUTION :N. BARTLETT
Discussion
17521.

The total number of electrons in 18 mL of water ("density = 1 g "mL^(-)1) is

Answer»

`6.02xx10^(23)`
`6.02xx10^(25)`
`6.02xx10^(24)`
`6.02xx18xx10^(23)`

Solution :`"18 mL of "H_(2)O=18" g of "H_(2)O="1 mole of "H_(2)O`
`=6.02xx10^(23)" molecules"`
Electrons present in 1 MOLECULE of `H_(2)O`
`2xx1+8=10`
`therefore" Electrons present in "6.02xx10^(23)` molecules
`=10xx6.023xx10^(23)=6.02xx10^(24)`
Discussion
17522.

What should be age of fossil for meaningful determination of its age ?

Answer»

6 YEARS
6000 years
60,000 years
it can be used to CALCULATE any age

SOLUTION :t (age of fossil ) `ge` 5770 years
Discussion
17523.

Which of the following azeotropes is not correctly matched?

Answer»

`HNO_(3)(68%)+H_(2)O(32%)`: Maximum BOILING azeotrope, boiling point = 393.5 K
`H_(2)O(43%)+HI(57%)`: Minimum boiling azeotrope, boiling point = 290 K
`C_(2)H_(5)OH(95.5%)+H_(2)O(4.5%)`: Minimum boiling azeotrope, boiling point = 351.15 K
Chloroform `(93.2%)+C_(2)H_(5)OH(6.8%)`: Minimum boiling azeotrope, boilingpoint = 332.2 K

Answer :B
Discussion
17524.

Which of the following can act as reducing agent ?

Answer»

`[CO(NH_(3))_(6)]^(+2)`
`[Co(NH_(3))_(6)]^(+3)`
`[Co(NH_(3))_(4)]^(+2)`
All of these

Solution :`[Co(NH_(3))_(6)]^(2+) to [Co(NH_(3))_(6)]^(3+)+E^(-)`
Discussion
17525.

Which of the following statements about low density polythene is FALSE /

Answer»

It is used in the manufacture of BUCKETS , dust-bins etc.
Its synthesis REQUIRES HIGH pressure
It is a poor conductor of electricity
Its synthesis requires dioxygen or a peroxide initiator as a catalyst.

Answer :A
Discussion
17526.

Writethe equationinvolvingthe preparationof aceticacidfromacetaldehyde.

Answer»

Solution :Preparationaceticacid fromacetaldehyde.
`underset("Aceta ldehyde")(CH_(3) - CHO+ )CO OVERSET("Rh//Ir complex")(to) CH_(3) underset("Acetic ACID ")(-COOH)`
Discussion
17527.

Which of the following will be favoured by high pressure?

Answer»

`PCL_5 HARR PCL_3 +CL_2`
`N_2+O_2 hArr 2NO`
`N_2+3H_2 hArr 2NH_3`
`H_2+I_2 hArr 2HI`

ANSWER :C
Discussion
17528.

Which one of the following materials is suitable for water purification

Answer»

Silicons
Zeolites
Asbestos
Quartz

Solution :Permanent hardness of water can be removed by permutit method. It includes the use of complex INORGANIC salts like `Na_2Al_(2)Si_(2)O_(8).xx H_(2)O`. (zeolites) which have property of exchanging cations such as `CA^(++),MG^(++)` with sodium salt ions.
Discussion
17529.

Write the defination of specific rotation.

Answer»


Answer :Specific rotation is the number of degrees of rotation observed if a 1-dm (10-cm) tube is used and the COMPOUND has concentration `1gm//mL.`Thus specific rotation `[alpha]` is
`[alpha]_(t)^(lambda) = (THETA)/(t xx C)`
Where, `[alpha]` = Specific rotation;`thetea` = observed angle of rotation (DEGREE)
l = Pathlength (dm);C = concentration (gm/ml)
`lambda` = wavelength (nm);t = temperature `(25^(@)C)`
Discussion
17530.

Which of the following will givereadily a hydrocarbon :

Answer»

`RCOOKoverset(eIectrolysis)RARR`
`RCOOAgundersetrarr(I_2)`
`CH_3CH_3overset(Cl_2)UNDERSET(HV)rarr`
`(CH_3)_2C Cl_2undersetrarr(C_2H_5OH)`

ANSWER :A
Discussion
17531.

Which of the following is not correct representation of H-bond?

Answer»




All are correct

Solution :Between `H_(2)O` and `NH_(3), O-H` BOND being more POLAR, form H-bond with l.p. of `NH_(3)`.
Discussion
17532.

When NaOH is added to CuSO_(4) solution, a pale blue precipitate is obtained. On adding aqueous ammonia solution, the precipitate dissolves to give a deep blue solution. If the solution is made acidic with dilute nitric acid, the solution turns pale blue again. Explain each step with the reaction taking place.

Answer»

Solution :`Cu^(2+)(aq)+2OH^(-)(aq)rarrunderset("Pale blue PPT.")(Cu(OH)_(2)(s))`
`Cu(OH)_(2)+4 NH_(3)RARR[Cu(NH_(3))_(4)]^(2+)(aq)+2OH^(-)(aq)`
`[Cu(NH_(3))_(4)]^(2+)(aq)+underset(("from " HNO_(3)))(4H_(3)O^(+))rarrunderset("Pale blue solution")([Cu(OH)_(4)]^(2-))+4NH_(4)^(+)(aq)`
Discussion
17533.

The volume of water to be added N/2 HCl to prepare 500cm^(3) of (N)/(10) solution is

Answer»

`450cm^(3)`
`100cm^(3)`
`45cm^(3)`
`400cm^(3)`

Solution :As `N_(1)V_(1)=N_(2)V_(2)`
`(N)/(2)XXV=(N)/(10)xx500`
V=100 `cm^(3)`
From 100ml of `(N)/(2)HCl` to 500 ml `(N)/(10)HCl`
WATER added=500-100=400ml.
Discussion
17534.

What is the role of the following chemicals in food? Sodium benzoate

Answer»

SOLUTION :FOOD PRESERVATIVE
Discussion
17535.

Which of the following can be considered as the monomer of natural rubber ?

Answer»




ANSWER :A
Discussion
17536.

Which of the following lanthanoid ions is diamagnetic (At. No. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

Answer»

`YB^(2+)`
`CE^(2+)`
`Sm^(2+)`
`Eu^(2+)`

Solution :Dimagnetic - no unpaired electron present
`Yb^(2+)=70[Xe]6s^(@)4 F^(14)5d^(@)` unpaired `e^(-)`=zero.
Discussion
17537.

The standard reduction potentials E^(@) for OCl^(-)//Cl^(-) and for Cl^(-)//1//2 Cl_(2) are 0.86 V and -1.10 volt respectively. The E^(@) value of OCl^(-)//1//2 Cl_(2) will be :

Answer»

`+ 1.96 V`
`- 1.96 V`
`+ 0.24 V`
`- 0.24 V`

Solution :`{:(OCL^(-)+H_(2)O+e^(-) rarr Cl^(-)+2OH^(-)""E_(red)^(@)=0.86 V ),(""Cl^(-) rarr 1/2 Cl_(2)+e^(-)""E_("OXI")^(@)=-1.10 V),(ulbar(OCl^(-)+H_(2)O rarr 1/2 Cl_(2) +2OH^(-) ""E^(@))=0.86+(-1.10)):}`
Discussion
17538.

Toluene reacts with halogen in presence of Iron (III) chloride giving ortho and para halo compounds. The reaction is

Answer»

FREE RADICAL ADDITION reaction
electrophilic ELIMINATION reaction
nucleophilic SUBSTITUTION reaction
electrophilic substitution reaction.

Answer :D
Discussion
17539.

Which of the followingis an additional polymer?

Answer»

NYLON-`6,6`
Dacron
High-density polythene
Nylon-`6,6`

ANSWER :C
Discussion
17540.

Which of the following is the correct order for strenght of C-X bond

Answer»

`CH_(3)F gt CH_(3) Cl gt CH_(3) BR gt CH_(3) I`
`CH_(3)F gt CH_(3)Cl gt CH_(3)Br gt CH_(3)I`
`CH_(3)I gt CH_(3)F gt CH_(3)Cl gt CH_(3)Br`
`CH_(3)Cl gt CH_(3)Br gt CH_(3)F gt CH_(3)I`

Solution :Smaller the BOND length, higher is the bond dissociation ENERGY.
Discussion
17541.

Which of the following reaction occurs at the cathode during the working of alkaline dry cell ?

Answer»

ZN is converted into ZNO
`MnO_(2)` is converted into `Mn_(2)O_(3)`
`Zn` is converted into `Zn^(2+)`
`Mn_(2)O_(3)` is converted into `MnO_(2)`

Solution :During alkaline DRY cell `MnO_(2)` is converted into `Mn_(2)O_(3)` at cathode .
Discussion
17542.

Which of the following can be enthalpy of neutralisation of a weak acid and a strong base?

Answer»

`-57.1 kJ`
`58.1 kJ`
`-56.1 kJ`
`114.2 kJ`

SOLUTION :The magnitude of ENTHALPY of neutralisation of weak acid and STRONG base is always LESS than -57.1 kJ. THUS it can be -.51 kJ
Discussion
17543.

Which one of the following sequence of groups in AMP ?

Answer»

SUGAR - BASE - phosphate
Base - sugar - phosphate
Phosphate - base - sugar
Phosphate - ACID - sugar

Answer :B
Discussion
17544.

Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be

Answer»

100 ml
20 ml
40 ml
60 ml

Solution :`{:(,NH_(3(g)),+,HCl_((g)),rarr,NH_(4)Cl_((s))),(t=0,20 ml,,40 ml,,0),(t=t,0,,20 ml,,"solid"):}`
Final volume `=20` ml.
Discussion
17545.

While giving labelled diagram of dry cell write reactions taking place at cathode and at anode.

Answer»

Solution :Primary cells are those in which the electrode reactions cannot be reversed by an external electric energy source. In these cells, the reaction occurs only once and after use they become dead. Therefore, they are not chargeable.
(a) Dry cell. The dry cell was invented by G. Leclanche. It consists of a zinc cylinder. This is filled with a paste of `NH_(4)CL` and little of `ZnCl_(2)` in the form of paste in water. The zinc cylinder acts as anode. The cathode is a carbon rod. The carbon rod is surrounded by a BLACK paste of manganese dioxide `(MnO_(2))` and carbon powder.
When the cell is operating, zinc loses electrons and `Zn2^(+)` ions dissolve in the electrolyte. The electrons pass. around the external circuit and are taken up at cathode. This causes DISCHARGE of `NH_(4)^(+)` ions from the electrolyte.
The reactions occurring at the electrodes are GIVEN below :
At anode
`ZntoZn^(2+)+2e^(-)`
At cathode

`2NH_(4)^(+)(aq)+2MnO_(2)(s)+2e^(-)toMn_(2)O_(3)(s)+NH_(3)+H_(2)O`
It gives a voltage of about 1.5 V.
(ii) Uses. The dry cells are used in torches, toys, flash lighters, calculators, tape-recorders and in many other devices.
Discussion
17546.

What is the formula of a substance with mass percentage of 35.79% for S, 62.92% for O and 1.13% for H?

Answer»

`H_(2)SO_(3)`
`H_(2)SO_(4)`
`H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(8)`

ANSWER :C
Discussion
17547.

Total number of nodal planes are same in

Answer»

3S, 4d
4s, 3p
5s, 4d
4s, 4p

Answer :D
Discussion
17548.

Which of the following is antiferromagnetic ?

Answer»

`CrO_2`
`Ti_2O_3`
`VO_2`
`FEO`

ANSWER :D
Discussion
17549.

Which of the following isomerism in exhibited by[Co(NH_(3))_(2)(H_(2)O)Cl_(2)]Cl

Answer»

Ionisation
GEOMETRICAL
HYDRATE
Optical

Solution :`[Co(NH_(3))_(2)(H_(2)O)Cl_(2)]Cl` similar to `[Ma_(2)b_(2)c_(2)]^(npm)` formula will exhibit
a) Hydrate isomerism
b) Geometrical isomerism c) Cis form has one optical isomer
If different ion to `Cl^(-)` is PRESENT out side the square BRACKETS, it will also exhibit IONIZATION isomerism.
Discussion
17550.

Which of the following is least reactive towards nucleophilic substitution reaction?

Answer»

`C_(6)H_(5)CH_(2)CL`
`C_(6)H_(13)Cl`
`C_(6)H_(5)Cl`
`C_(3)H_(7)Cl`

Answer :C
Discussion