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9851.

What volume of 95% sulphuric acid (density = 1.85 g mL^(-1)) and what mass of water must be taken to prepare 100 mL of 15% solution of sulphuric acid (density = 1.1 g mL^(-1)) ?

Answer»


Solution :Step. Calculation of molarity of 95% `H_(2)SO_(4)` solution.
`"Mass of "H_(2)SO_(4)" in 100 g of solution"=95 g`
`"Density of solution"=1.85 ML^(-1)`
`"Volume of 100 g of solution"=("Mass")/("Density")=((100g))/((1.85"g mL"^(-1)))=54.05 mL`
`"Molarity (M)"=("Mass of "H_(2)SO_(4)"/Molar mass")/("Volume of solution in LITRES")=((95G)//(98"g mol"^(-1)))/(0.05405 L)=17.93 M`
Step II. Calculation of molarity of 15% `H_(2)SO_(4)` solution.
`"Mass of "H_(2)SO_(4)" in 100g of solution"=15g`
`"Density of solution"=1.1" g mL"^(-1)`
`"Volume of 100g of the solution"=("Mass")/("Density")=((100g))/((1.1"g mL"^(-1)))=90.90 mL`
`"Molarity (M)"=("Mass of "H_(2)SO_(4)"/Molar mass")/("Volume of soltuion in litres")=((15g)//98"g mol"^(-1))/((0.0909L))=1.68 M`
Step III.Calculation of volume of 17.93 M solution required.
The volume can be calculated with the help of molarity equation,
`M_(1)V_(1)=M_(2)V_(2)`
`(17.93 M )xx(V_(1))=(1.68 M)xx(100mL)`
`V_(1)=((1.68M)xx(100mL))/((17.93M))=9.37 mL.`
Step IV. Calculation of mass of WATER to be taken.
`"Mass of 100 mL of 15% "H_(2)SO_(4)" to be prepared" =Vxx=d=(100 mLxx1.1"g mL"^(-1))=110g`
`"Mass of 9.37 mL of 95% "H_(2)SO_(4)=Vxxd=(9.37 mLxx1.85"g mL^(-1))=17.33 g`
`"Mass of water to be taken"=(110-17.33)=92.67 g`
Discussion
9852.

What is rate constant of a reaction? Establish the relationbetween the rate constant of a first order reactionwith itshalf-life period. If half-life period of afirst order reaction is T sec, show that after nT sec [1-((1)/(2))^(n)]fraction of initial concentration of reactant has completely reactad.

Answer»

Solution :THIRD part : LET the initial concentration of the reactant A, in first order reaction be `[A]_(0)` . Now , in NTS time , the reaction undergoes n number of half-lives. Therefore, after n NUMBEROF half-lives , concentration of the reactant will be `[A]_(0)//2^(n)` .
`therefore` The AMOUNT of reactant completely reacted
`=[A]_(0)-([A]_(0))/(2^(n))=[A]_(0){1-(1//2)^(n)}`
So , after nT s of time ,`[1-(1//2)^(n)]` fraction of initial concentration of the reactant will completely react.
Discussion
9853.

Which possesses minimum activation energy?

Answer»

BLACK P
White P
Red P
None of these

Answer :B
Discussion
9854.

What will be the e.m.f. of the given cell? Pt|H_(2)(P_(1))|H^(+)(aq)|H_(2)(P_(2))|Pt

Answer»

`(RT)/(F)"ln"(P_(1))/(P_(2))`
`(RT)/(2F)"ln"(P_(1))/(P_(2))`
`(RT)/(F)"ln"(P_(2))/(P_(1))`
none of these

Solution :`R.H.S.:2H^(+)+2e^(-)toH_(2)(P_(2))`
`L.H.S.:H_(2)(P_(1))to2H^(+)+2e^(-)`
Overall REACTION: `H_(2)(P_(1))toH_(2)(P_(2))`
`E=E^(@)-(RT)/(nF)"ln"(P_(2))/(P_(1))=0-(RT)/(2F)"ln"(P_(2))/(P_(1))=(RT)/(2F)"ln"(P_(1))/(P_(2))`
Discussion
9855.

The solubility of PbCl_2 at 25^oC is 6.3 xx 10^-3 mol/litre. The solubilityproduct of PbCl_2 at 25^oC is:

Answer»

`(6.3xx10^(-3)) XX (6.3xx10^(-3))`
`(6.3xx10^(-3)) xx (12.6xx10^(-3))`
`(6.3xx10^(-3)) xx (12.6xx10^(-3))^2`
`(12.6xx10^(-3)) xx (12.6xx10^(-3))`

ANSWER :C
Discussion
9856.

Which among the following is not obtained by treating aqueous silver nitrate with hypophosphorous acid?

Answer»

`H_3PO_3`
`AG`
`HNO_3`
`H_3PO_4`

ANSWER :A
Discussion
9857.

Which are called biomolecules :

Answer»

Carbohydrate
Protein
Lipids
All

Answer :D
Discussion
9858.

Which of the following is not a constitutent of RNA?

Answer»

RIBOSE
PHOSPHATE
ADENINE
PYRIDINE

ANSWER :D
Discussion
9859.

Which of the following are outer orbital octahedral complexes ?

Answer»

`[FeF_(6)]^(3-)`
`[FE(CN)_(6)]^(-4)`
`[Fe(CN)_(6)]^(3-)`
`[Fe(H_(2)O)_(6)]^(2+)`

Solution :`F^(-) & H_(2)O` are weak ligand no pairing of electrons forms octer orbital OCTAHEDRAL complex,
Discussion
9860.

Which of the following used for the conversion of 2-hexyne into trans-2-hexene

Answer»

`H_2//Pd//BaSO_4`
`H_2,PtO_2`
`NaBH_4`
`Li-NH_3//C_2H_5OH`

Solution :The parial REDUCTION of alkynes by active metal in LIQUID AMMONIA takes place through trans vinylic anion which ultimately produces trans alkene.
2-hexyne gives trans-2-hexene on TREATMENT `Li//NH_3 CH_3-CH_2-CH_2-C-=C-CH_3+H_2overset(Li//NH_3)to underset"trans-2-hexene"(CH_3-CH_2-CH_2-overset(H)overset|C-undersetunderset(H)(|)C-CH_3)`
Discussion
9861.

Which of the following statement are correct

Answer»

Quenched STEEL is mild steel
Nitriding is HEATING iron in atmosphere of `N_(2)`
stainless steel is produced by heating wrought iron in only moltes chromium
mild steel is obtained by annealing

Solution :Quenched steel is hard and brittle, nitriding is heating of iron in the presence of `NH_(3)`
To make stainless steel iron ore is heated in the presence of molten chromium, silicon, nickel.
By anaealing mild steel is obtained which containing low % of CARBON and shows properties like elasticity
Discussion
9862.

Which of the following is an example of vic-dihalide?

Answer»

Dichloromethane
1,2-Dichloroethane
Ethylidene chloride
Allyl chloride

Answer :B
Discussion
9863.

Which of the following has dsp^(2) hybridization and is diamagnetic in nature ? (P) Na_(4)[Cr(CO)_(4)""(Q) [Ni(DMGH)_(2)] (R ) [PtHBr(Pet_(3))_(2)]""(S) [Ag(SCN)_(4)]^(3-) (T) [AuBr_(4)]^(-)

Answer»

P, Q, S only
P, R, S, T only
Q, R, T only
R, T only

Solution :(P) [CR`(CO)_(4)]^(4-)` has `d^(10)` CONFIG. `sp^(3)` hyb.
Discussion
9864.

The species presents in thesolutionwhen CO_(2) is dissolvesin water are

Answer»

`CO_(2),H_(2)CO_(3),HCO_(3)^(Θ),CO_(3)^(2-)`
`H_(2)CO_(3),CO_(3)^(2-)`
`CO_(3)^(2-),HCO_(3)^(Θ)`
`CO_(2),H_(2)CO_(3)`

SOLUTION :
Discussion
9865.

Which among the foJlm.ving will show maximum osmotic pressure?

Answer»

`1M NaCl`
`1 M M gCl_(2)`
`1 M (NH_(4)) _(3) PO _(4)`
`1 M Na_(2) SO_(4)`

Solution :Vant Hoff factor `I =4` in case of `(NH_(4)) _(3) PO_(4),`
`(NH_(4)) _(3) PO _(4) HARR 3 OVERSET(+) N H _(4)+ PO_(4) ^(3-)`
Discussion
9866.

Which of the following orders are correct as per the properties mentioned against each ?

Answer»

`SiO_(2) lt As_(2)O_(3) lt P_(2)O_(3) lt SO_(2)""` Acid strength
`AsH_(3) lt PH_(3) lt NH_(3)""` Enthalpy of vapourisation
`S lt O lt Cl lt F""` More negative electron gain enthalpy
`H_(2)O GT H_(2)S gt H_(2)Se gt H_(2)TE""` Thermal stability

Solution :Acid strength increases in the order : `SiO_(2) lt As_(2)O_(3) lt P_(2)O_(3) lt SO_(2)` and thermal stability decreases in the order : `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te.
Thus, optio (a) and (d) are CORRECT.
Discussion
9867.

Transition metals are widely used as catalysts in industrial processes. Name any two industrial processes in which transition elements are used as catalysts.

Answer»

Solution :FE - Haber process, NI - Hydrogenation of oil
Discussion
9868.

To carry out above convertion reagent used in decreasing order.

Answer»

`Na//liq.NH_(3),CHBr_(3)//NAOH(DELTA)`
`H_(2)//Pd-CaCO_(3),CHBr_(3)//NaOH(Delta)`
`Na//liq.NH_(3),CHBr_(3)//NaOH`
`H_(2)//Pd-CaCO_(3),CHBr_(3)//NaOH`

Solution :(B)
Discussion
9869.

Which of the following complex is example of strongest reducing agent ?

Answer»

`[Co(CN)_(6)]^(-3)`
`[Co(CN)_(6)]^(-4)`
`[Ag(CN)_(2)]^(-1)`
`[Cu(CN)_(4)]^(-3)`

ANSWER :B
Discussion
9870.

Which of the following gives iodoform on heating with a solution of I_2 containing Na_2CO_3 ?

Answer»

ETHYL ALCOHOL
Acetone
Ethyl alcohol as WELL as Acetone
Methyl alcohol

Answer :B
Discussion
9871.

Which of the following reagents would distinguish cis-cyaclopentane-1-2-diol from the trans-isomer?

Answer»

`MnO_(2)`
Aluminium isopropoxide
ACETONE
Ozone

Solution :A cyclic ketal contains a five-membered RING. Since TWO fused five membered rings are more stable if the fusion is cis, THEREFORE, cis-cyclopentane-1,2-diol forms a stable ketal with acetone but trans isomer does not react.
Discussion
9872.

Which one of the following has the minimum boiling point ?

Answer»

Isobutane
1-Butyne
1-Butene
n-Butane

Solution :BOILING point ORDER : Alkyne `GT` Alkene `gt`Alkane (for same NUMBER of CARBONS)
Discussion
9873.

Why can't the molecularity of a reaction be equal to zero?

Answer»

SOLUTION :As per the definition, molecularity of a reaction is the NUMBER of molecules taking PART in an elementary STEP. AT least a SINGLE molecule is needed for the reaction to take place.
Discussion
9874.

There are three isomeric tetracarboxylic acid. Which of these form two isomeric monoanhydrides ?

Answer»

<P>only P
only P and Q
only Q
P, Q and R

Answer :A
Discussion
9875.

Which of the following are aerosols ?

Answer»

Smoke
Fog
Milk
BUTTER

SOLUTION :Milk is EMULSION. Butter is gel. Smoke and fog have GAS (air) as the disperrsoion MEDIUM and hence are aerosol.
Discussion
9876.

What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes ?

Answer»

Solution :LYOPHILIC colloids : These colloids are solvent loving and form stable colloidal SOLUTIONS on mixing the dispersed phase and the dispersion medium.
Lyophobic colloids : These colloids are solvent repelling. They don.t form the colloidal solution easily on mixing the dispersed phase and the dispersion medium. These are prepared by SPECIAL methods.
Lyophobic colloids are easily coagulated on the addition of SMALL amounts of ELECTROLYTES.
Discussion
9877.

The region containing water vapour is

Answer»

thermosphere
stratosphere
TROPOSPHERE
mesosphere

Solution :Troposphere CONTAINS WATER VAPOUR.
Discussion
9878.

Which one of the following exhibits geometrical isomerism?

Answer»

1,2-dibromopropene
2,3-dimethylbut-2-ene
2,3-dibromobut-2-ene
2-methylbut-2-ene

Answer :A::D
Discussion
9879.

Which of the following reaction takes place through SN^2mechanism ?

Answer»

`CH_3 -CH_2 -O-CH_2 - CH_3 + HI to CH_3CH_2I + CH_3CH_2OH`
`CH_3 - CH_2 - OH + HBr overset(DELTA)(to) CH_3CH_2Br + H_2O`
`(CH_3)_3C - OH + HI to (CH_3)_3C - I + H_2O `
both 1 and 2

Answer :D
Discussion
9880.

Which of the following is used for the seperation of ZnS and PbS during the froth flotation process?

Answer»

KCl
KCN
`NH_(4)NO_(3)`
NONE of these

Answer :2
Discussion
9881.

When CH_2=CH-Br is reacted with HBr then the product formed is A and when CH_2=CH-COOH is treated with HBr then the product formed is C. Hence here

Answer»

A is `undersetunderset(Br)|CH_2-undersetunderset(Br)|CH_2`

C is `CH_3-undersetunderset(Br)|CH-COOH`
C is `undersetunderset(Br)|CH_2-CH_2-COOH`

SOLUTION :When `CH_2=CH-Br` is treated with HBr then the carbocation formed is `CH_3 overseto+CH-Br` which is resonance STABILIZED, hence A is `CH_3underset"Br"UNDERSET"|"CH-Br` while when `CH_2=CH-COOH` is REACTED with HBr then the carbocation formed is `overseto+CH_2-CH_2-COOH` Hence C is `undersetunderset(Br)(|)CH_2-CH_2COOH`
Thus (b) and (d) are correct whereas (a) and (c ) are incorrect
Discussion
9882.

Which of the products will be major product in the reaction given below? Explain. CH_(3)CH=CH_(2)+HI to underset((A))(CH_(3)CH_(2)CH_(2)I)+underset((B))(CH_(3)CHICH_(3))

Answer»

Solution :The given reaction is an example of electrophilic addition reaction in which a proton ADDS first to form a carbocation which is then ATTACKED by `I^(-)`

Since `2^(@)` carbocation is more stable than `1^(@)` carbocation, therefore, 2-iodopropane (B) is the major product and 1-iodopropane (A) is the minor product.
The same conclusion can be drawn from Markovnikov's rule which states that the major product is OBTAINED by addition of the NEGATIVE part of the adding molecule to that carbon atom of the double bond which carries lesser number of HYDROGEN atom. thus, 2-iodopropane (B) is the major product while 1-iodopropane (A) is the minor product.
Discussion
9883.

Which of the following aryl amines will not form a diazonium salt on reaction with sodium nitrite in hydrochloric acid?

Answer»

N, N-Dimethylaniline
p-Amino acetophenone
4-Chloro-N-methyl aniline
N-Ethyl-2-methyl aniline

Solution :`1^(@)` AMINES are REACTIVE
Discussion
9884.

Which of the following reactions is/are wrong?

Answer»

a.`MeCH_(2)I overset(AgNO_(2))(rarr)MeCH_(2)NO_(2) overset(HNO_(2))(rarr)Me-underset(N. OH)underset(||)(C )-NO_(2)overset(overset(ɵ)(OH))(rarr)` Blue colour
b.`Me_(2)CHI overset(AgNO_(2))(rarr)Me_(2)CHNO_(2) overset(HNO_(2))(rarr)Me_(2)-underset(N=O)underset(|)(C )-NO_(2)overset(overset(ɵ)(OH))(rarr)` Blood red colour
c.`Me_(3)C-I overset(AgNO_(2))(rarr)Me_(3)C-overset(O)overset(uarr)(N)=Ooverset(HNO_(2))(rarr)No REACTION overset(overset(ɵ)(OH))(rarr)` Colourless solution
d.`Me_(3)C-Ioverset(AgNO_(2))(rarr)Me_(3)C-O-N=O overset(HNO_(2))(rarr) "No reaction" overset(overset(ɵ)(OH))(rarr)` Colourless solution

Solution :The reaction in `(a), (b)`, and `(d)` are wrong, but the reaction (c ) is CORRECT.
In `(a)`, in the end the colour is blood red.
In `(b)`, in the end the colour is blue.
In `(d), RX` with `AgNO_(2)` gives `RNO_(2)` (nitro alkane) and not `R-O-N=O` (alkyl NITRITE).
`Me_(3)C-I overset(AgNO_(2))(rarr) Me_(3)C-NO_(2)`.
So the worng reactions are `(a), (b)`, and `(d)`
Discussion
9885.

Define Ebullioscopic constant.

Answer»

Solution :The elevation in boiling point of solvent containing 1 mole of non-volatile solute in 1kg solvent is CALLED edullioscopic constant or molar elevation constant and is denotad by `K_b` < BR> `DeltaT_b = K_b` when molality(m) `= 1,`
since` DeltaT_b = K_bm`
Discussion
9886.

Which of the compounds HCHO(I),CH_3CH_2CHO(II),CH_3COCH_3(III) and HCOOC_2H_5 (IV) will give a secondary alcohol on reaction with excess Grignard reagent , followed by hydrolysis ? Select the correct answer using the codes given below

Answer»

II only
III only
I and IV
II and IV

Answer :D
Discussion
9887.

Which one of the following can be explained by the adsorption theory?

Answer»

HOMOGENEOUS CATALYSIS
Acid-base catalysis
HETEROGENEOUS catalysis
Enzyme catalysis

SOLUTION : Heterogeneous catalysis
Discussion
9888.

Using Raoult's law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions. (ii) NaCl(s) and H_(2)O(l)

Answer»

Solution :(ii) As solute NaCl is non-volatile, vapour pressure of SOLVENT in solution is equal to vapour pressure of solution, i.e., `P_("total") or P_("SOLN")=p_(H_(2)O)=x_(H_(2)O)xxp_(H_(2)O)^(@)`
Discussion
9889.

Which one of the following reactions of xenon compound is not feasible ?

Answer»

`XeO_3 + 6HF toXeF_6 + 3H_2O`
`3XeF_4 + 6H_2O to 2Xe + XeO_(3) + 12HF + 3/2O_(2)`
`2XeF_2 + 2H_2O to 2Xe + 4HF + O_2`
`XeF_6 + RBF toRb+[XeF_7]^-`

SOLUTION :`XeF_6` spontaneously hydrolyse to give `XeO_3` and HF. HENCE, reverse REACTION is not possible.
Discussion
9890.

Which of the following oxides of nitrogen will be the most stable one?

Answer»

`2NO_(2(g))iffN_(2(g))+2O_(2(g)),K=6.7xx10^(16)molL^(-1)`
`2NO_((g))iffN_(2(g))+O_(2(g)),K=2.2xx10^(30)molL^(-1)`
`2N_(2)O_(5(g))iff2N_(2(g))+5O_(2(g)),K=1.2xx10^(24)molL^(-1)`
`2N_(2)O_((g))iff2N_(2(g))+O_(2(g)),K=3.5xx10^(33)molL^(-1)`

Solution :Lower the equilibrium constant, greater is the stablity.
Discussion
9891.

Which of the following shows electromeric effect:

Answer»

Aldehyde
Alakane
Alkyl amines
Alkyl halides

Answer :A
Discussion
9892.

Writethe reactionof Cl_2 with water

Answer»

SOLUTION :`2CI_2 +2H_2O OVERSET(HV ) to 4HCI +O_2`
Discussion
9893.

Which of the following is a gem dihalide?

Answer»

`CH_(3)CHBrCHBrCH_(3)`
`BrCH_(2)CH_(2)Br`
`CHBR=CHBr`
`CH_(3)CHBr_(2)`

Solution :Gem dihalides have HALOGEN ATOMS on the same carbon atoms.
Discussion
9894.

When benzoic acid is treated with PCl_(5) at 100^(@)C, it gives

Answer»

BENZOYL chloride
o-chlorobenzoic acid
p-chlorobenzoic acid
Benzyl chloride

Answer :A
Discussion
9895.

Which of the following decreases with dilution ?

Answer»

Conductance
Specific conductance
Cell constant
None of these.

Answer :B
Discussion
9896.

What is emf of Pt|H_(2(P1))|H_((aq))^(+)||H_((aq))^(+)|H_(2(P2))|Pt cell ?

Answer»

`(RT)/(F)"LN"(P_(1))/(P_(2))`
`(RT)/(2F)"ln"(P_(2))/(P_(1))`
`(RT)/(2F)"ln"(P_(1))/(P_(2))`
`(RT)/(F)"ln"(P_(2))/(P_(1))`

Solution :`(RT)/(2F)"ln"(P_(2))/(P_(1))`
Discussion
9897.

Using Raoult's law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions. (i) CHCl_(3)(l) and CH_(2)Cl_(2)(l)

Answer»

Solution :(i) As both the components are VOLATILE, in the solution
`p_(CHCl_(3))=x_(CHCl_(3))xxp_(CHCl_(3))^(@)"and"p_(CH_(2)Cl_(2))xxp_(CH_(2)Cl_(2))^(@)`
`P_("total")orP_("SOLN")=x_(CHCl_(3))p_(CHCl_(3))^(@)+x_(CH_(2)Cl_(2))p_(CH_(2)Cl_(2))^(@)=x_(CHCl_(3))p_(CHCl_(3))^(@)+(1-x_(CHCl_(3)))p_(CH_(2)Cl_(2))^(@)``=(p_(CHCl_(3))^(@)-p_(CH_(2)Cl_(2))^(@))x_(CHCl_(3))+p_(CH_(2)Cl_(2))^(@)`
Discussion
9898.

Write one chemical reaction each to illustrate the following : (i) Hoffmann Bromamide reaction. (ii) Gabriel phthalimide reaction.

Answer»

Solution :(i) Hoffmann bromamide reaction :
`UNDERSET("Ethanamide")(CH_(3)-overset(overset(O)(||))(C)-NH_(2))+Br_(2)+4KOH rarr underset("Metanamine")(CH_(3)NH_(2))+K_(2)CO_(3)+2KBr+2H_(2)O`
(ii) Gabriel Phthalimide reaction :
Discussion
9899.

Which of the following is/are correct order :- (A)Thermal stability = BeSO4 lt MgSO_4 lt CaSO_4 lt SrSO_4 (B) Melting point = NaCl gt KCl gt RbCl gt CsCl (C) Solubility = LiOH lt NaOH (D) Lattice energy = KF gt KCl gt KBr gt KI

Answer»

A and B
B and D
A, B and D
A, B, C and D

ANSWER :D
Discussion
9900.

Which of the following complex ion has a magnetic moment same as [Cr(H_(2)O)_(6)]^(3+)?

Answer»

`[MN(H_(2)O)_(6)]^(4+)`
`[Mn(H_(2)O)_(6)]^(3+)`
`[Fe(H_(2)O)_(6)]^(3+)`
`[Cu(H_(3)N)_(4)]^(2+)`

ANSWER :A
Discussion