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3401.

Which of the following reaction does not occur in Bessemer's converter?

Answer»

`2Cu_(2)S+5O_(2) RARR 2CuSO_(4)+2CuO`
`2Cu_(2)S+3O_(2) rarr 2CuO+2SO_(2) uarr`
`2CuFeS_(2)+O_(2) rarr Cu_(2)S+2FeS+SO_(2)`
`FeO+SiO_(2) rarrFeSiO_(3)`

ANSWER :3
Discussion
3402.

Van't Hoff's factor for a solution is less than one . What is the conclusion drawn from it ?

Answer»

SOLUTION :SOLUTE UNDERGOES ASSOCIATION
Discussion
3403.

What is the potential of a hydrogen electrode at pH=10?

Answer»

SOLUTION :`-0.59M`
Discussion
3404.

Which of the following compounds does not undergo mutarotation ?

Answer»

Glucose
Sucrose
Ribose
Fructose

Answer :B
Discussion
3405.

The thresthold frequencey for photoelecric emission of electrons from platinum is 1.3xx10^(15)s^(-1). Which of the following statements is not correct?

Answer»

the number of electrons ejected from the metal surface will DEPEND upon the the intensity of radiation having frequency `le1.3xx10^(15)s^(-1)`.
The radiation having energy `1XX10^(-20)J` will be ABLE to cause photoelectric efect.
If radiation having frequency `1.3xx10^(14)s^(-1)` strikes theplatinum suface, photo-electrons will not be ejected.
The kinetic energy of the emittedelectrons will increasse with increase in frequency provided it is greater than `1.3xx10^(15)s^(-1)`.

Solution :Threshold frequency `v_(0)=1.3xx10^(15)s^(-1)` and threshold energy
`hv_(0)=6.6xx10^(-34)xx1.3xx10^(15)`
`=858xx10^(-19)J`
Therefore OPTION b , c and d are correct. Option A is not correct.
Discussion
3406.

Write two uses of ClO_(2)?

Answer»

SOLUTION :Uses of `ClO_(2)` :
(i) It is used as a bleaching agent in PAPER and textile industry.
(ii) It is used as a GERMICIDE for DISINFECTING water.
Discussion
3407.

What are interstitial compounds ? Why do these compounds have melting points than corres-ponding pure metas ?

Answer»

Solution :Interstitial compounds : they are those compounds of the transition metals which are formed when small ATOMS like H,C or N are TRAPPED inside the interstitial vacant spaces in the crysal LATTICES of the metals Some of the exampes of interstitial compounds point due to the following reasons :
(a) They are very hard.
(b) They are chemically inert.
The presence of the FOREIGN atoms stabilizes the crystal structure.
Discussion
3408.

The decreasing order of strength of the bases, OH^(-), NH_(2)^(-), H-C-=C^(-) and CH_(3)-CH_(2)^(-):

Answer»

`CH_(3)-cH_(2)^(-) GT NH_(2)^(-) gt H-C -=C^(-)`
`H-C-=C^(-) gt CH_(3)-CH_(2)^(-) gt NH_(2)^(-)gt OH^(-)`
`OH^(-) gt NH_(2)^(-) gt H-C-=C^(-) gt CH_(3)-CH_(2)`
`NH_(2)^(-) gt H-C-=C^(-) gt OH^(-) gt CH_(3)-CH_(2)`

Answer :A
Discussion
3409.

What is the equivalent weight of KMNO_(4) in: Neutral medium

Answer»

Solution :EQUIVALENT weight (MASS) (E) of an OXIDISING agent LIKE is given by, Molecular weight of `KMNO_(4)`
`E=("Molecular weight of "KMnO_(4))/(" Change in the oxidation STATE")`
In neutral medium: The oxidation state of Mn in `KMNO_(4)` changes from +7 to +4.
`therefore E_(KMnO_(4))=(158)/(7-4)=52.67`
Discussion
3410.

Write the IUPAC names for : (i) CH_(3)-underset(underset(NH_(2))(|))(CH)-underset(underset(CH_(3))(|))(CH)-CONH_(2)"(ii) " (##U_LIK_SP_CHE_XII_C13_E09_040_Q01.png" width="80%">

Answer»

SOLUTION :(i) 3-Amino-2-methylbutanamide.
(II) 4-Nitroso-N, N-dimethylbenzenamine.
Discussion
3411.

Which of following react same manner with H - CHO " and " C_(6)H_(5) - CHO ?

Answer»

FEHLING's SOLUTION
`CH_(3) - MgX`
`NH_(3)`
dil . `NaOH`

Answer :B
Discussion
3412.

Which is (are) ore) of aluminium

Answer»

Cryolite
Bauxite
Malachite
CUPRITE

SOLUTION :Cryolite `-Na_(3)AlF_(6) ""` Bauxite -`Al_(2)O_(3)2H_(2)O`
Malchite `-CuCO_(3)Cu(OH)_(2)""` Cuprit `-Cu_(2)O`
Discussion
3413.

When magnesium is burnt in air, compounds of magnesium formed are magnesium oxide and:

Answer»

`MgCO_3`
`MG(NO_2)_2`
`Mg(NO_3)_2`
`Mg_3N_2`

ANSWER :D
Discussion
3414.

Which alkyl halide is used as a methylating agent?

Answer»

`CH_(3)Cl`<BR>`C_(2)H_(5)Br`
`C_(2)H_(5)l`
`CH_(3)l`

ANSWER :A::D
Discussion
3415.

The smelting of iron in the blast furnace involves all the following processes EXCEPT_________

Answer»

oxidation
reduction
decomposition
sublimation

Answer :D
Discussion
3416.

Which gives black precipitate on reaction with CS_2followed by addition of HgCl_2?

Answer»

`(CH_3)_3C CH_2NH_2`
`(C_2H_5)_2NH`
`(CH_3)_3N`
All of these

Solution : Only `1^@` AMINES UNDERGO Hofmann.s Mustard oil REACTION and thus GIVE a black ppt. of Hgs.
Discussion
3417.

Which statement is incorrect about final major product (X)?

Answer»

It can not decolourise `Br_(2)` water
OZONOLYSIS of (X) can give TWO type of PRODUCTS
X gives same product on reaction with NBS and reaction of X with (i) (a) `BH_(3)`.THF,(b) `H_(2)O_(2)//OH^(-)` and then (ii) `P//Br_(2)`
It can not form salt on reaction with `NaOH`

Solution :N//A
Discussion
3418.

Which one is stable at cooking temperature ?

Answer»

SUCROLOSE
Saccharin 
Aspartame
Alitame 

SOLUTION :Sucrolose
Discussion
3419.

Whichsubstanceis not presentis nucleicacid ?

Answer»

CYTOSINE
ADENINE
THYMINE
GUANIDINE

ANSWER :D
Discussion
3420.

Whichof the followingis acetylatting agent ?

Answer»

`CH_(3)COCl`
`CH_(3)CONH_(2)`
`(CH_(3)CO)_(2)O`
`CH_(3)COONa`

ANSWER :C
Discussion
3421.

Which of the following is the sweetest?

Answer»

Glucose
Fructose
Maltose
Sucrose

Answer :B
Discussion
3422.

Which of the following are arranged in the decreasing order of dipole moment ?

Answer»

`CH_(3)Cl, CH_(3)BR, CH_(3)F`
`CH_(3),Cl, CH_(3)F, CH_(3)Br`
`CH_(3)Br, CH_(3)Cl, CH_(3)F`
`CH_(3)Br, CH_(3)F, CH_(3)Cl`

Solution :`CH_(3)Cl GT CH_(3)F gt CH_(3)Br`
Discussion
3423.

Which of the following statements are correct about this reaction ?

Answer»

The given reaction follows `S_(N)2` MECHANISM.
(ii) and (iv) have opposite configuration.
(ii) and (iv) have same configuration.
The given reaction follows `S_(N)1` mechanism.

Solution :The given reaction follows `S_(N)2` mechanism as it passes through TRANSITION state and the configuration in (iv) is inversed.
Discussion
3424.

Which one is not characteristic of alcohols ?

Answer»

They are lighter than water
Their B.P. rise uniformly with increasing molecular MASS
Lower MEMBERS are INSOLUBLE in water but solubility increases REGULARLY
Lower members have pleasent odour and burning test

ANSWER :C
Discussion
3425.

Write I.U.P.A.C name of (i) [Co(NH_(3))_(5)Cl]Cl_(2) (ii) [Co(en)_(2)Cl(ONO)]^(+)

Answer»

SOLUTION :(i) pentaamminechloridocobalt (III) CHLORIDE (II) chloridobis(ethane-1, 2-diamine) nitritocobalt (III) ION
Discussion
3426.

When 5.1g of solid NH_4HS is heated at 637K in a closed vessel of volume SL, the given equilibrium establishes: NH_4HS(s)--NH_3(g)+H_2(g)+H_2S(g)+H_2S(g). If 3.06g of NH_4HS remains at equilibrium, then find the value of K_p

Answer»

Solution :Amount of `NH_4HS` DISSOCIATED`=(5.1-3.06)g=2.04g`
2.04g of `NH_4HS=(2.04)/(51)-=0.04mol" of "NH+4HS`
`NH_4HS(s) At equilibrium:0.04 mol0.4 MOL
`K_c=[NH_3][H_2S]=((0.04)/(5))((0.04)/(5))`
`=6.4xx10^(-5)mol^2*L^(-2)`
`K_p=K_c(RT)^(/_\n)=K_c(RT)^2`
`=6.4xx10^(-5)(0.0821xx637)^2=0.175`
Discussion
3427.

What is the oxidation number of phosphorus in H_(3)PO_(2) molecule ?

Answer»

<P>

SOLUTION :If x is the O.N. of P in `H_(3)PO_(2)`, then 3(+1) + x + 2 (-2) = 0 or x = +1.
Discussion
3428.

The zig-zag motion of colloidal particles is called _____

Answer»

SOLUTION :Brownian MOVEMENT.
Discussion
3429.

Unit of resistivity is _________.

Answer»

OHM metre
siemen
`SM^(-1)`
mho

Answer :A
Discussion
3430.

Write the structures of the major products in the following reactions : (i) CH_(3)CH = C(CH_(3))_(2) + HBr to(ii) C_(6)H_(5)ONa + C_(2)H_(5)Cl to

Answer»

Solution :(i) `CH_(3) - CH= C(CH_(3))_(2) + HBr to underset("2-Bromo -2-methylbutane")(CH_(3) - CH_(2) - underset(Br)underset(|)overset(CH_(3))overset(|)C - CH_(3))`
(II) `C_(6)H_(5)ONa + C_(2)H_(5)CL to underset("ETHOXYBENZENE")(C_(6)H_(5)OC_(2)H_(5)) + NaCl `
Discussion
3431.

What is 'anhydrone'?

Answer»

ANHY. CaO
Anhy.`CaCl_2`
Anhy. `MgCl_2`
Anhy. `MgClO_4`

SOLUTION :Ahydrous is anhy. `MgClO_4`.
Discussion
3432.

What is the relationship between enthalpy (H) and internal energy (E) ?

Answer»


ANSWER :H=E +PV
Discussion
3433.

Write structures of the following compounds. (i) 2-chloro-3-methylpentane (ii) 1,4-Dibromobut-2-ene

Answer»

SOLUTION :`H_(3) OVERSET(1)C-underset(Cl)underset(|)overset(H)overset(|)(""^2C)-underset(CH_3)underset(|)overset(H)overset(|)(""^3C)-underset(H)underset(|)overset(H)overset(|)(""^4C)-underset(H)underset(|)overset(H)overset(|)(""^5C)-H`
`Br-underset(H)underset(|)overset(H)overset(|)(""^1C)-underset(H)underset(|)(""^(2)C)=underset(H)underset(|)(""^(3)C)-underset(H)underset(|)overset(H)overset(|)(""^4C)-Br`
Discussion
3434.

The total number of alcohols (including stereoisomers) possible with the formula C_(5)H_(12)O is

Answer»

`8`
`10`
`11`
`9`

Solution :Draw the five CARBON atoms in sequence and then positionsthe `OH` giving three structural isomers.
`underset(underset(underset("Diethylcarbinol")(n-"Pentylalchol"))(Pentan-1-ol(1^(@))))(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)OH) underset(C^(2)"is chiral"(+,-))underset("methylpropylcarbinol")underset("Pentan-2-ol(2^(@)))(CH_(3)overset(**)CH(OH)CH_(2)CH_(2)CH)`
`underset("Diethylcarbinol")underset("Pentan-3-ol")(CH_(3)CH_(2)CH(OH)CH_(2)CH_(3))`
Draw four carbon atoms in sequence and then position `CH_(3)` and `OH` to give four structural isomers.
`underset("Isobutylcarbinol")underset(3-"Methylbutan-1-ol"(1^(@)))(CH_(3)overset(CH_(3))overset(|)(CH)CH_(2)CH_(2)OH)underset(C^(2) "is chiral"(+,-))underset("Methylisopropylcarbinol")underset(3-"Methylbutane-2-ol(2^(@)))(CH_(3)overset(CH_(3))overset(|)(CH)underset(OH)underset(|)overset(**)(CH)CH_(3))`
`CH_(3) underset("Dimethylethylcarbinol") underset (t -"Pentylalcohol") underset(3-"Methylbutan"-2-ol(3^(@))) (underset(OH)underset(|) overset(CH_(3))overset(|)(C)CH_(2)CH_(3)) , underset("C^(2) is chiral(+ ,-)") underset("Sec-Butylcarbinal") underset(2-"Methylbutan"-1-ol(1^(@)))(HOCH_(2)overset(CH_(3))overset(|**)(CH)CH_(2)CH_(3))`
With three sequential carbon atoms, there is just one structural isomer :
`CH_(3) - underset(t-"Butylcarbinol") underset("Neopentylalcohol") underset(2 ,2-"Dimethylpropan"-1-ol(1^(@)))(underset(CH_(3)) underset(|) overset(CH_(3)) overset(|)(C)-CH_(2)-OH)`
Thus, a total of eleven alcohols (including stereoisomers) is POSSIBLE
Discussion
3435.

Write the atomic number of the element in which the filling of 3d subshell in the atom just starts.

Answer»

SOLUTION :SCANDIUM (Z = 21).
Discussion
3436.

The standard emf of a galvanic cell involving 3 moles of electrons in a redox reaction is 0.59V. The equilibrium constant for the reaction of the cell is

Answer»

`10^(25)`
`10^(20)`
`10^(15)`
`10^(30)`

Solution :`E_(cell)^(@)=(0.0591)/(n)logK""thereforelogK=(0.59xx3)/(0.0591)=30thereforeK=10^(30)`
Discussion
3437.

Which of the following is not correctly matched ore and its metal ?

Answer»

Siderite - IRON
MALACHITE - Copper
Pyrolusite - Manganese
Willemite - LEAD

ANSWER :D
Discussion
3438.

Which statement are correct about following :

Answer»

it is sucrose.
Due to pressure of heme ACETAL LINKAGE it is non-reducing sugar.
Left SIDE unit is `alpha`-D-glucose and right side unit is `BETA`-D-fructose.
Due to absence of heme acetal linkage it can't SHOW mutarotation.

Solution :N//A
Discussion
3439.

Why amines are basic in nature ?

Answer»

SOLUTION :Because the lone PAIR of electrons on the NITROGEN atom can be DONATED to electron DEFICIENT species.
Discussion
3440.

What [H_(3)O^(+)] must be maintained in a satured H_(2)S solutions of precipitate Pb^(2+) but not Zn^(2+) form a solution in which each ion is present at a concentration of 0.01M? (K_(sp) of H_(2)S=1.1xx10^(-22),K_(sp) of ZnS=1.0xx10^(-21),sqrt(11)=3.3)

Answer»

Solution :For `ZnS` not to be precipitate from a solution of `Zn^(2+)` and `Pb^(2+),IP_(ZnS)ltK_(sp(ZnS))`
`[Zn^(2+)][S^(2-)] ltK_(sp) of ZnS`
`[10^(-2)][S^(2-)] lt1.0xx10^(-21):.[S^(2-)lt10^(-19)M`
so at `[S^(2-)]=10^(-19)M` or less no PRECIPITAION of `ZnS` will occur.
`H_(2)S HARR 2H^(+)+S^(2-)`
`:.[H^(+)]^(2)[S^(2-)]=K_(sp(H_(2)S))=1.1xx10^(-22):.[H^(+)]_(min)^(2)=1.1xx10^(-22)`
`[H^(+)]_(min)^(2)=11xx10^(-4):.[H^(+)]_(min)=3.3xx10^(-22)`
Thus if `[H^(+)=3.3xx10^(-2)M` or more the precipitaion of `ZnS` will not take PLACE and only `PbS` will precipitate .
Discussion
3441.

What is not applicable to ozone ?

Answer»

It is a BENT MOLECULE with bond angle approximately `117^@`
It has FOUR lone pairs of electrons in one of its Lewis formula
The two O-O bond LENGTHS are EQUAL
It is an allotrope of oxygen.

Answer :B
Discussion
3442.

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

Answer»

Solution :(i) `CHCl_(3)` : For a binary solution having both components as volatile liquids (viz. `CHCl_(3)` and `CH_(2)Cl_(2)`), the total pressure will be
`p=x_(1)p_(1)^(0)+x_(2)p_(2)^(0)`
`= p_(1)^(0)+1-x_(2)p_(2)^(0)`
`= (p_(1)^(0)-p_(2)^(0))x_(1)+p_(2)^(0)`
p = total vapour pressure of the given MIXTURE / binary solution of the given volatile liquids.
`p_(1)=` partial vapour presure of component 1 (i.e., `CHCl_(3)`)
`p_(2)=` partial vapour pressure of component 2 (i.e., `CH_(2)Cl_(2)`)
(ii) `NaCl_((s))`and `H_(2)O_((l))` : For a solutioncontaining non - volatile solute i.e., `NaCl_((s))`and `H_(2)O_((l))`, the Raoult.s LAW is applicable only to vaporisable component (1) i.e., `H_(2)O_((l))` and total vapour pressure is written as `p=p_(1)=x_(1)p_(1)^(0)` where `p_(1)^(0)p_(1)` oreresents the vapour pressure of pure `H_(2)O_((l))`
Discussion
3443.

Which compounds on Clemmenson reduction give propane

Answer»

Solution :`underset("Acetone")(CH_(3)-underset(O)underset(||)(C)-CH_(3))underset(HCL[H])overset(Zn//Hg)tounderset("Propane")(CH_(3)CH_(2)CH_(3))`
Discussion
3444.

Which of the following contitutes irreversible colloidal system in water as dispersion medium?

Answer»

CLAY
Platinum
`Fe(OH)_(3)`
All of these

Solution :All are IRREVERSIBLE COLLOIDAL systems.
Discussion
3445.

whichof the followingaminewillshowcarbylaminereaction?

Answer»




ANSWER :A
Discussion
3446.

When treated with ammonical cuprous chloride, which one among the following forms copper derivative ?

Answer»

`C_(2)H_(6)`
`C_(2)H_(2)`
`C_(2)H_(4)`
`C_(6)H_(6)`

Answer :B
Discussion
3447.

Which one of the following statement s regarding benzyl chloride is not correct-

Answer»

It produces a white precipitate with `AgNO_(3)` solution
It is an AROMATIC COMPOUND in which the side chain is subsituted.
It takes PART in the nuclephilic substitution reaction.
it is less REACTIVE than vinyl chloride.

Answer :D
Discussion
3448.

White blood cells act :

Answer»

as defence against INFECTION
as source of energy
for transport of molecular OXYGEN from lunds to tissues
for BLOOD clotting.

ANSWER :A
Discussion
3449.

Which of the following will best convert nitobenzene into 3-fluorobromobenzene .

Answer»

`F_(2)//AlCl_(3),Zn//HCl,NaNO_(2)//HCl-0^(@)C,CuBr` .<BR>`SnCl_(2)//HCl,Br//FeBr_(2),NaNO_(2)//HBF_(4)-0^(@)C,heat` .
`SnCl_(2)//HCl,NaNO_(2)//HBF_(4)-0^(@)C,heat,Br_(2)//FeBr_(3)` .
`Br_(2)//FeBr_(3)SnCl_(2)//HCl,NaNO_(2)//HBF_(4))^(@)C,heat`.

Answer :D
Discussion
3450.

Which of the following is a true peroxide ?

Answer»

`PbO_2`
`CO_2`
`SO_2`
`BaO_2`

ANSWER :D
Discussion