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12651.

Which of the following is a froth stablizer in the frothfloatation process?

Answer»

FATTY acids
Aniline
PINE oil
Xanthates

Answer :2
Discussion
12652.

The standard e.m.f. of a cell, involving one electron change is found to be 0.591V at 25^(@)C. The equilibrium constant of the reaction is (F=96,500C" "mol^(-1),R=8.314KJ^(-1)" "mol^(-1))

Answer»

`1.0xx10^(10)`
`1.0xx10^(5)`
`1.0xx10^(1)`
`1.0xx10^(30)`

Solution :`E_(cell)=E_(cell)^(o)-(0.0591)/(n)logK_(C)`
At 298K `E_(cell)=0,0=0.591-(0.591)/(n)logK_(C)`
`logK_(C)=(0.591xx1)/(0.0591)=10,K_(c)="anti LOG 10"=1XX10^(10)`
Discussion
12653.

Which of the following halo alkane is most reactive towards SN^1

Answer»

1-chloro PROPANE <BR>1-Bromo propane
2-chloro propane
2-Bromo propane

SOLUTION :`H_3C - oversetunderset(|)(Br)(H)C - CH_3`
Discussion
12654.

Which of the following is/are colourless?

Answer»

 IRON (III) chloride solution
Magnesium iodide solution
Cobalt (11) SULPHATE solution
Silver NITRATE solution 

ANSWER :B::D
Discussion
12655.

Which of the following complex will be paramagnetic ? (Assume all central atom have t_(2g)^(6)e_(g^(0)) configuration).

Answer»

`[FECL(CN)_(4)(O_(2))]^(4-)`
`K_(4)[FeCl(CN)_(6)]Cl`
`K_(4)[(NH_(3))_(6)]Cl_(3)`
`[Fe(CN)_(5)(O_(2))]^(-5)`

SOLUTION :`[overset(+2)Feoverset(-1)Cl(overset(-4)CN)_(4)(underset("paramagnetic")underset(darr)(overset(-1)O_(2)))]^(4-)`
Discussion
12656.

The strength in volumes of a solution containing 30.36 g/l of H_(2)O_(2) is

Answer»

10 volume
20 volume
5 volume
none of these

Solution :E.W. of `H_(2)O_(2) =17: N=30.36/17=1.78 N`
Volume strength =5.6 X normality
=5.6 x 1.78 =10 L
Discussion
12657.

Which of following are correct.

Answer»

`B_(2)H_(6)` in non-planar.
`B_(2)H_(6)` undergo symmetrical cleavage with `PF_(3),CO`and `(C_(2)H_(5))_(3)N`
`B_(2)H_(6)` undergo unsymmetrical cleavage with `NH_(3),CH_(3)NH_(2),(CH_(3))_(2)NH`
`BeH_(2)(s),Ga_(2)Me_(5),Al_(2)Me_(6)`have two TYPE of bonds (`2C-2e` bond as well as `3C-2e` bond)

Solution :STRUCTURE of `Al_(2)Me_(5)`
Discussion
12658.

Which of the following does not have a metal carbon bond ?

Answer»

`K[pt(C_2H_4)Cl_3]`
`Ni(CO)_4`
`Al(OC_2H_5)_3`
`C_2H_5MgBr`

Answer :C
Discussion
12659.

What happen when diborane heated at various temperature?

Answer»

Solution :Diborane isa gas at room temperature with sweet smell and it is EXTREMELY toxic. It is also highly reactive. At high teperatures it forms higher boranes boranes liberating hydrogen.
`5B_(2)H_(6)underset(U-"tube")overset(388 K)(to) 2B_(5)H_(11)+4H_(2)""5B_(2)H_(6)overset(473-523K)(to) 2B_(5)H_(9)+6H_(2)`
`2B_(2)H_(6)overset(198-373K)(to)B_(4)H_(10)+H_(2)""10B_(2)H_(6)overset(523K)(to)2B_(5)H_(9)+2B_(5)H_(9)+2B_(5)H_(10)+11H_(2)`
`5B_(2)H_(6)underset("SEALED Tube")overset(373K)(to)B_(10)H_(14)+8H_(2)""B_(2)H_(6)overset("Red hot")2B+3H_(2)`
Discussion
12660.

Which one is an acidic salt

Answer»

`K_(2) SO_(4)`
`NA HSO_(3)`
`Na_(2) SO_(3)`
`Na_(2) SO_(4)`

ANSWER :B
Discussion
12661.

What is the free energy change in dissolving one mole of NaCl with its lattice energyand hydration energy of 777.8 kJ mol^-1 "and"-774 kJ mol^-1 "respectively at" 25^@ C? (Given: DeltaS=0.043 kJ K^-1 mol^-1)

Answer»

`-18.2 KJ mol^-1`
`-36.4 kJ mol^-1`
`-9.1 kJ mol^-1`
`18.2 kJ mol^-1`

ANSWER :C
Discussion
12662.

What simple laboratory test could be performed to distinguish between 1-pentyne and 2-pentyne?

Answer»

the addition of `AG^(+)` in ammonia
the addition of `H_(2)SO_(4)` in `HG^(+2)`
the addition of `Br_(2)` in `C Cl_(4)`
the addition of `H_(2)` on a `PT` catalyst.

Solution :N//A
Discussion
12663.

The stability of +5 oxidation state decreases down the group 15 of the periodic table. Explain this observation giving appropriate reasons.

Answer»

<P>

Solution :All the elements of group 15 have five electrons in the valence shell, TWO in the s-subshell and three in the p-subshell. Therefore, among others, they can show positive oxidation states of +3 (DUE to PARTICIPATION of only p-electrons) and +5 (due to theparticipation of both s- and p-electrons of the valence shell). Now N does not have d- or f-electrons but all other elements have either d- or both d- and f-electrons in the inner shells. Since d- and f-electrons shield the s-electrons of the valence shell more effectively than the p-electrons, therefore, on moving down the group, tendency of s-electrons to participate in bond formation decreases while that of p electrons increases. As a result, among heavier elements of group 15, the electron pair in s-orbital of the valence shell shows reluctance to participate in bond formation. In other words, among heavier elements, only p-electrons participate in bond formation and hence show an oxidation state of +3. This is called inert pair effect. Further, as the number of d- and f-electrons increases down the group, the inert pair effect becomes more and more pronounced. In other words, down the group from As to Bi, the stability of +3 oxidation state increases while that of +5 oxidation state decreases.
Discussion
12664.

Which of the following is not a disproportionation reaction? I. NH_4NO_3 overset(Delta)(rarr) N_2O + H_2O II. P_4 overset(Delta)(rarr) PH_3 +HPO_(2)^(-) III. PCl_5 overset(Delta)(rarr) PCl_3 + Cl_2 IV H_2O_2 rarr O_2 +2e^(-)

Answer»

I, II
I,III,IV
II, IV
I, III

Solution :B) REACTION II is DISPROPORTIONATION, while I, III and IV are not.
Discussion
12665.

Which of the following is an irreversible reaction?

Answer»

`2NH_(3)toN_(2)+3H_(2)`
`PCl_(5)toPCl_(3)+Cl_(2)`
`KClO_(3)toKCl+O_(2)`
`SO_(3)to SO_(2)+O_(2)`

Solution :Irrversible reaction is `KClO_(3) to KCl+O_(2).` POTASSIUM CHLORATE, `KClO_(3)` is obtained by the electrolysis of HOT solution of KCl.
Discussion
12666.

Write the structures of the following compounds (ii) 3-Hydroxybutanal

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_002_S01##)`
Discussion
12667.

Which is the correct order of K for Cus, ZnS and CdS?

Answer»

CUS GT ZNS gt CDS
COS gt Cus gt ZnS
ZnS gt CDS gt Cus
ZnS gt Cus gt Cds

Answer :C
Discussion
12668.

Which of the following properties are same for a metal and its hydride-

Answer»

hardness
metallic lustre
electrical conductance
magnetic property

Answer :A::B::C::D
Discussion
12669.

Which of the following has square planar structure

Answer»

 `[NICI_(4))]^(2-)`
`[Ni(Co)_(4)]`
 `[Ni(CN)_(4)]^(2-)`
None of the above

Solution :`[Ni(CN)_(4)]^(2-)`has square planar STRUCTURE HENCE, (C) is the correct ANSWER.
Discussion
12670.

Then A may have :

Answer»

`CO_(3)^(2-), BR^(-)`
`Br^(-), S^(2-)`
`CH_(3)CO O^(-), S^(2-)`
`CH_(3)CO O^(-), SO_(3)^(2-)`

ANSWER :D
Discussion
12671.

Which of the following state is/are correct?

Answer»

ADDITION of HBR to conjugated pentadine OCCURS at a faster RATE than isolated pentadiene
Addition of `Br_(2)` to ethyne occurs at a slower rate than addition of ethene
Addition of one mol of HBr to 1,3-butandiene at room temperature gives 1,4-dibromo but 2-ene as the major product 1,4-dibromo but 2-ene as the major product
All the above statement are correct.

Solution :All the statement are correct.
Discussion
12672.

What is the coordination number of each sphere in: (i) Hexagonal close packed structure and

Answer»

SOLUTION :Coordination, number of each SPHERE in (i) HEP is 6
Discussion
12673.

Treatement of ammonia with excess of ethyl chloride will yield

Answer»

DIETHYLAMINE
METHYLAMINE
tetraethylammoniumchloride
ETHANE

ANSWER :C
Discussion
12674.

Write the structure of the major organic product in each of the following reactions :CH_(3)CH_(2)CH_(2)Cl+NaI + overset(" acetone ")underset(" heat ")rarr

Answer»

SOLUTION :`CH_(3)CH_(2)CH_(2)-I`
Discussion
12675.

The standard reduction potentials for the two half-cell reactions are given below : Cd^(2+) (aq) + 2e^(-) to Cd(s) , E^(0) = -0.40 V ""Ag^(+)(aq) + e^(-) to Ag(s) , E^(0) = 0.80 V The standard free energy change for the reaction 2Ag_((aq))^(+) + Cd_((s)) + Cd_((aq))^(2+)is given by

Answer»

`115.8 KJ `
`-115. 8 kJ`
`-231.6 kJ`
`231.6 kJ `

ANSWER :C
Discussion
12676.

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product (s) obtained is (are)

Answer»




SOLUTION :It is CANNIZZARO REACTION
Discussion
12677.

Which one is protein fibre:

Answer»

Cotton
Rayon
Silk
Polyester

Answer :C
Discussion
12678.

Which among the following molecular formuale represents urotropine?

Answer»

`C_(6)H_(12)N_(4)`
`C_(6)H_(12)N_(4)O_(2)`
`C_(6)H_(24)H_(4)`
`C_(6)H_(24)N_(4)O_(2)`

Answer :A
Discussion
12679.

Which one of the following properties is not shown by NO?

Answer»

It is diamangetic in gaseous STATE.
It is a NEUTRAL OXIDE.
It combines with OXYGEN to form nitrogen dioxide.
Its bond order is 2.5.

Solution :NO is paramagnetic in gaseous state because it has one unpaired electron. However, it dimerises at low temperature to become diamagnetic. It combines with `O_(2)` to form `NO_(2)` and is neutral oxide and has bond order of 2.5.
Discussion
12680.

Which scientist awarded the Noble prize in the field of physiology and medicine ?

Answer»

ALEXANDER Fleming
Howard Florey
Ernst BORIS Chain
All of the GIVEN 

SOLUTION :All of the given
Discussion
12681.

Which pairs of the salts woulg have identical solubilities in methanol ?

Answer»

I & IV
I & III
I & II
II & IV

Solution :Enantiomers have same SOLUBILITY in optically inactive SOLVENTS so (I) & (IV) have same solubility because are enantiomers
`I to` R-R-Configuration, `II to` S-S-Configuration
Discussion
12682.

Which is correct about zero order reaction

Answer»

Rate of reaction depends on decay CONSTANT
Rate of reaction is independent of CONCENTRATION
Unit of rate constant is `"concentration"^(-1)`
Unit of rate constant is `"concentration"^(-1) "time"^(-1)`

SOLUTION :For ZERO order reaction , rate of reaction is independent of concentration R = k `["Reactant"]^(0)`
Discussion
12683.

Which is used as a Tranquilizer ?

Answer»

Equamine
Naproxin
Phenol
Tetracycline

Answer :A
Discussion
12684.

Which of the following is not a condensation (step growth) polymer?

Answer»

Melamine-formaldehyde RESIN
BAKELITE
POLYTHENE
Polyester

Solution :Polythene is an ADDITION POLYMER.
Discussion
12685.

Which one is the derivatives of barbituric acid ?

Answer»

Veronal
Amytal
Luminal
All of the GIVEN 

SOLUTION :All of the given
Discussion
12686.

What should be the value of 1/n in the Freundlich adsorption isotherm, to show that adsorption can be independent of pressure ?

Answer»

<P>

Solution :ZERO should be the value of 1/n in the frenadlich adsorption isotherm, to show that adsorption can be INDEPENDENT of pressure.
`"i.e.,"=(x)/(m)=K_(1)p^(1//n)"where"1//n=0`
`(x)/(m)=KP^(@)""rArr ""(x)/(m)alphaK`
Discussion
12687.

The widely used PVC is a polymerised product of:

Answer»

`CH_2=CH_2`
`CH_2=CCl_2`
`CH_2ClCH_2Cl`
`CH_2=CHCl`

ANSWER :D
Discussion
12688.

What weight of ferrous ammonium sulphate is needed to prepare 100 ml of 0.1 normal solution (mol. wt. 392)

Answer»

39.2 GM
3.92 gm
1.96 gm
19.6 gm

SOLUTION :`W=(0.1xx100xx392)/(1000)=3.92 G`
Discussion
12689.

What amount of solid acetate should be added into 1 litre of the 0.1 M CH_(3)COOH solution so that the resulting solution has pH almost equal to pK_(a) (CH_(3)COOH) = 4.74.

Answer»

`12 gm`
`5 gm`
`10 gm `
`14.924 gm`

Solution :Since the resulting solution be acidic BUFFER , one may use Henderson equation.
`PH = pK_(a) + log .([CH_(3)COO^(-)])/([CH_(3)COOH]) `
LET n mol of `CH_(3)COONa` be added to do so
or , `pH = 4.74 + log[((n(mol))/(v(L)))/((0.1(mol))/(v(L)))] " or , " 5 = 4.74 + log [n/(0.1)]`
or, `log . n/(0.1) = 0.26 "or," n/(0.1) = " antilog " 0.26 = 1.8197`
`:. n = 0.1897 mol ~= 0.182 ` mol
amount of sodium acetate = `0.182 xx 82 gm = 14.924` gm
Discussion
12690.

Write the final product(s) in each of the following reactions : (a) CH_(3)-overset(CH_(3))overset("|")underset(CH_(#))underset("|")"C "-O-CH_(3)+HI rarr (b) CH_(3)-CH_(2)-underset(OH)underset("|")"CH"-CH_(3) overset(Cu//573K)rarr (c) C_(6)H_(5)-OH overset((i)CHCl_(3)+aq. NaOH) underset((ii)H^(+))rarr.

Answer»

Solution :The FINAL product of the reactions (a), (B) and (c ) are given below :
(a) `underset("t-Butyl IODIDE")(CH_(3)-underset(CH_(3))underset("|")overset(CH_(3))overset("|")"C "-I and CH_(3)OH`
(b) `underset("Butanone")(CH_(3)-CH_(2)-overset(O)overset(||)C-CH_(3))`
(c)
Discussion
12691.

Which of the following statement is incorrect :

Answer»

`O_2` is paramagnetic , `O_3` is also paramagnetic
`O_2` is paramagnetic , `O_3` is diamagnetic
`B_2` is paramagnetic , `C_2` is also paramagnetic
Different observation is FOUND in their BOND length when NO `to NO^(+)` and `COTOCO^+`

SOLUTION :`O_2`=paramagnetic (2 unpaired electrons in antibonding `pi`-ORBITAL)
`O_3`=diamagnetic
`B_2`=paramagetic (2 unpaired electrons)
`C_2`=diamagnetic molecule.
NO `to NO^(+)`(bond length decreases )
CO `to CO^(+)`(bond length decreases )
Discussion
12692.

Which of the following statements is correct ? (i) Copper is extracted by hydrometallury from low grade ores. (ii) In electrolytic reductionof alumina , graphite is acting as anode and steel vessel with lining of carbon acts as cathode. (iii) In Hall-Heroult process, aluminium is obtained at anode and COand CO_(2) are produce at cathode

Answer»

(i) only
(i) and (II) only
(ii) and (iii) only
All of these

Solution :In Hall-Heroult process,
At cathode : `Al_("(MELT)")^(3+)+ 3e^(-) to Al_((L))`
At anode : `C_((s)) + O_("(melt)")^(2-) to CO_(2(g)) + 4e^(-)`
`C_((s)) + 2O_("(melt)")^(2-) to CO_(2(g)) + 4e^(-)`
Discussion
12693.

Write the formulasfor following coordination compounds : (1) Tris ( ehtane -1,2-diammine) cobalt (III) sulphate (2) Potassiumtrioxalatoaluminate(III) (3) Hexacaronylchromium (0)

Answer»

SOLUTION :(1) `[Co(en)_(3)]_(2)(SO_(4))_(3)`
(2) `K_(3)[AL(C_(2)O_(4))_(3)]`
`Cr(CO)_(6)`
Discussion
12694.

Which of the following does not have P pi-d pi bonding

Answer»

`NO_(3)^(-)`
`SO_(3)^(2-)`
`BO_(3)^(3-)`
`CO_(3)^(2-)`

SOLUTION :
Discussion
12695.

Write the conditions for maximum work done by the system.

Answer»

Solution :Conditions for maximum work done by the system are :
(i) Anychange taking PLACE in it is thermodynami- cally REVERSIBLE manner.
(ii) The change in the system takes place in an infinite NUMBER of steps.
(iii) The driving force of the change is infinitesimally GREATER than the opposing force.
(iv) The system is in mechanical EQUILIBRIUM with its surroundings.
Discussion
12696.

Which of the following is a narcotic analgesic ?

Answer»

Ibuprogen
ASPIRIN
PARACETAMOL
MORPHINE

ANSWER :D
Discussion
12697.

Which of the following statements about electron capture is/are correct ?

Answer»

<P>An outer shell VALENCE electron is used
The electron is used to convert a proton to a neutron
In electron capture decay , the MASS NUMBER remains unchanged
In electron capture decay , the atomic number decreases by one

Solution :`""_(+1) P^(1) + ""_(-1) e^(0) to ""_(0) N^(1)` , So `.Z.` decrease by 1 unit and A remains same
Discussion
12698.

Which catalyst used in Lucas test ?

Answer»

ANHYDROUS `ZnCl_(2)`
Hydrous `ZnCl_(2)`
Anhydrous `ZnSO_(4)`
Hydrous `ZnSO_(4)`

SOLUTION :Anhydrous `ZnCl_(2)`
Discussion
12699.

The vapour pressure of benzene and its solution with a non-electrolyte are 640 and 600 mm respectively. The molality of the solution is -

Answer»

0.8
0.86
0.09
0.95

Answer :B
Discussion
12700.

Which metal is extracted by electrolytic reduction ?

Answer»

IRON
Copper
Silver
Aluminium

Answer :D
Discussion