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6051.

While testing BO_(3)^(3-)there is a green edged flame on heating the salt with conc. H_(2)SO_(4) and CH_(3)OH, green colour is of

Answer»

`(CH_(3))_(3)B`
`(CH_(3)O)_(3)B`
 `B_(2)O_(3)`
`H_(3)BO_(3)`

ANSWER :B
Discussion
6052.

van't Hoff factor (i)

Answer»

Is less than one in CASE of dissociation
is more than one in case of association
i=NORMAL molecular mass /obervedmolecular mass
i=observed molecular mass/normal molecular mass

Solution :`i = "observed colligative PROPERTIES"/"normal colligative properties"`
`"(colligative properties)" prop 1/"MOLAR mass"`
Discussion
6053.

Which of the following solvent may be used instead of ether in the preparation of Grignard reagent:

Answer»

`THF`
`C_6H_5OCH_3`
`C_6H_5N(CH_3)_2`
All are CORRECT

ANSWER :D
Discussion
6054.

What is the commonality between the antibiotic arsphenamine and azodye?

Answer»

Solution :Arsphenamine is also known as salversan. It is a SYNTHETIC ORGANIC arsenic compound that was previously used for treating syphilis Arsphenamine possess `-As = As-` linkage.
Azodyes are used to promote epithelial growth in the treatment of ulcers, BURNS and other WOUNDS. Many azodyes possess `- N = N -` linkage like arsphenamine which possess `- As = As -` linkage.
Discussion
6055.

Thespacebetweenthe outermostfilledenergy bandand thenextempty bandis called____.

Answer»

VALENCEBAND
Conductionband
forbidden zone
hydride GAP

ANSWER :C
Discussion
6056.

What isthe roleofcryolitein themetallurgy ofaluminium ?

Answer»

Solution :The ROLE ofcryolite in the metallurgyof aluminium istwo- fold :
(i) Fusedalumina`(Al_2 O_ 3 ) ` is abadconductorofelectricitybuttheadditionofcryolite` (NaAlF_ 6 )`MAKES itgoodconductor. As ARESULT,aluminiumcan beobtainedbyelectrolysis.
(ii) Themeltingpoint of purealuminaisveryhigh (2323 K ) BUTTHE additionofcryolitelowersthemeltingpointthemixtureto around1140 K. As aresult,electrolysisiscarriedoutat amuchlowertemperature (1173 K ) whichsaves LOT ofelectricity.
Discussion
6057.

Very pure nitrogen can be obtained by the thermal decomposition of ........

Answer»

Barium azide
Sodium azide
Either a or B
None

Solution :Very pure NITROGEN is OBTAINED by decomposition of sodium (or) Barium AZIDES
`2NaN_(3)overset(Delta)rarr 3Na+3N_(2) , Ba(N_3)_2overset(Delta)rarrBa+3N_2`
Discussion
6058.

Which of the following statements is correct ?

Answer»

MAJOR PRODUCT is FORMED at a
major product is formed at b
major product is formed at C.
Reaction does not TAKE place.

Answer :C
Discussion
6059.

Why bleaching action of sulphur dioxide is temporary?

Answer»

Solution :In presence of water, sulphur dioxide bleaches coloured wool, silk, sponges and staw into colourless due to its reducing property.
`SO_(2)+2H_(2)RARR 2H_(2)SO_(4)+2(H)`
`underset("(Coloured)")(X)+2(H)rarr underset("Coloulress")(XH_(2))`
However, the bleached product (colourless) is allowed to stand in AIR, it is reoxidised by atmopheric oxygen to its ORIGINAL COLOUR. Hence bleaching action of sulphur dioxide is temporary.
Discussion
6060.

Which of the following is the correct electronic configuration of Sc (Z = 21)?

Answer»

`[AR] 3d^(3)`
`[Ar] 3d^(1) 4s^(2)`
`[Ar] 3d^(2) 4s^(1)`
`[Ar] 4s^(2) 4p^(1)`

SOLUTION :`[Ar] 3d^(1) 4s^(2)`
Discussion
6061.

The term (-(dc)/(dt)) in a rate equation refers to the

Answer»

CONCENTRATION of the reactant
DECREASE in concentration of the reactant with TIME
INCREASE in concentration of the reactant with time
Velocity constant of the reaction

Solution :`-(DC)/(dt)` refers as decrease in concentration of the reactant with time .
Discussion
6062.

Which of the following set of Quantum numbers is not possible?

Answer»

n=4,l=3,M2,s=+1/2
n=4,l=2,m=+2,s=-1/2
n=4,l=2,m=-2,s=+1/2
n=4,l=1,m=-2,s=-1/2

Solution :If l-1 then PERMISSIBLE VALUES of m=-1,0,+1
Discussion
6063.

Which of the following cannot be used in Friedel-Craft's reaction

Answer»

`FeCl_3`
`FeBr_2`
`AlCl_3`
NaCl

Solution :All cations are expected to act as LEWIS acid SINCE they are electron deficient in nature . However, cation such as `Na^+, K^+` etc (inert gas CONFIGURATION ) have a very little tendency to accept electrons. Therefore, they do not act as Lewis acids in Friedel-Craft's REACTION
Discussion
6064.

Which of the following statements is not correct for a lyophobic solution?

Answer»

It can be EASILY solvated
It carries charges
The coagulation of this sol is IRREVERSIBLE in nature
It is LESS stable in a solvent

Answer :A
Discussion
6065.

This pollutant causes burning sensation of throat and eyes and vomiting sensation

Answer»

Hydrogen sulphide
Sulphur
Hydrogen cyanid
Arsenic substances

Solution :Hydrogen sulphide POLLUTANT is eliminated from refineries and chemical industries. They PRODUCE burning sensation of throat and EYES and VOMITING sensation
Discussion
6066.

The value of n in the molecular formula Be_(1)Al_(2)Si_(6O_(18) is

Answer»

Solution :`FeS_(2)to2SO_(2)to2SO_(3)toH_(2)S_(2)O_(7)to2H_(2)SO_(4)`
1 mol of `FeS_(2)` = 2 mol of `H_(2)SO_(4) = 2 xx 98 gm H_(2)SO_(4)`
`therefore`Moles of `FeS_(2)=(5.52xx1000)/(120)`moles of `FeS_(2)=(5.52xx1000)/(120)xx298`
=9kg of `H_(2)SO_(4)`
Discussion
6067.

Which of the following reagents can be used as 'P' ?

Answer»

`O_3`
EXCESS `Cl_2` water
CONC. `HNO_3`
HCl

Solution :`O_3, Cl_2` water and conc. `HNO_3` being strong oxidants will OXIDISE sulphur (present in eq. suspension of WHITE solid) into `H_2SO_4`.
Discussion
6068.

Write the formula of anoxoanion of manganese(Mn) in which it shows the oxidation state equal toits group number. or Writethe formulaof an oxoanion of chromium (Cr) in which it shows the oxidation state eqaul to its group number.

Answer»

SOLUTION :`MnO_(4)^(-)`(permanganate ion). Oxidation state of `Mn= +7`
Group NUMBER of Mn`=7`
`Cr_(2)O_(7)^(2-)` ( dichromate ion) . Oxidationstate of `Cr= + 6` Group number of Cr=6
Discussion
6069.

Which of the following compounds is the strongest acid ?

Answer»




SOLUTION :E.W.G `UARR` a.c `uarr`
Discussion
6070.

Two elements gallium and oxygen combine to form a compund Ga_(2)O_(3) which among the followingis the valaencyof gallium?

Answer»

is not a base
is not an acid
is neither an acid nor a base
must be PURE water

Solution :pure water is neutal i.e neither acidic h or BASIC hence does not SHOW CHANGE COLOUR of litmus
Discussion
6071.

The species having tetrahedral shape is:

Answer»

`[PdCl_4]^(2-)`
`[Ni(CN)_4]^(2-)`
`[PD(CN)_4]^(2-)`
`[NiCl_4]^(2-)`.

ANSWER :D
Discussion
6072.

Which is /arecorrect statementabout zinc blende structure ?

Answer»

zinc ions occupy half of the tetrahedral sites
each `Zn^(2+)` ion is surrounded by six sulphide ions
each `S^(2-)` ion issurrounded by six `Zn^(2+)` ions
it has fcc structure

Solution :ZNS has a ccp structure . `S^(2-)` ions are present at the CORNERS of the cube and CENTRE of each FACE. `Zn^(2+)` ions occupy half of the tetrahedral sites. Each `Zn^(2+)` ion is surrounded by four `S^(2-)` ions and each `S^(2-)` ion is surrounded by four `Zn^(2+)` ions.
Discussion
6073.

Which is correct in increasing order of ionic character ?

Answer»

`AlCL_(3) lt MgCl_(2) lt NACL`
`LiF lt LiCl lt LIBR lt Lil`
`NaCl gt MgCl _(2) lt ALCL _(3)`
None of the above

ANSWER :A::B
Discussion
6074.

Which of the carbide will give methane when reacts with water-

Answer»

`BeC_(2)`
`CaC_(2)`
`Be_(2)C`
`Mg_(2)C_(3)`

Answer :C
Discussion
6075.

Which is the best reducing agent ?

Answer»

`F^(-)`<BR>`I_(2)`
`Br_(2)`
`I^(-)`

Solution :lodine is strongest reducing agent than fluorine, chlorine and bormine. Due to an excess of ELECTRONS to the IODINE anion ACTS as a stronger reducing agent then neutral atom.
Discussion
6076.

Which of these does not influence the rate of reaction

Answer»

Nature of the reactants
CONCENTRATION of the reactants
TEMPERATURE of the REACTION
Molecularity of the reaction

SOLUTION :Molecularity of the reaction does not influence the rate of reaction .
Discussion
6077.

Which compound have maximum dipole moment ?

Answer»




SOLUTION :
Discussion
6078.

Which of the following represents the isopolyacid of phosphorus ?

Answer»

`{:(""O""O),(""||""||),(H-P-O-P-O-H),(""|""|),(""O-H""O-H):}`
`H - OVERSET(O) overset(||) UNDERSET(OH) underset(|)P - overset(O) overset(||)P -underset(OH) underset(|) OH`
`H-overset(O) overset(||) underset(OH) underset(|)P - O - overset(O) overset(||) underset(H) underset(|)P - H`
`HO - overset(O) overset(||) underset(OH) underset(|) P -O- overset(O) overset(||) underset(OH) underset(|)P - OH`

Answer :D
Discussion
6079.

Which of the following compounds has maximum stability ?

Answer»

`CH_(2) = CH - CH_(2) - CH = CH_(2)`
`(CH_(3))_(2) C = CH - CH_(2) - CH = CH_(2)`
`CH_(2) = CH - CH = CH_(2)`
`CH_(2) = CH - UNDERSET(CH_(3))underset(|)(CH) - CH = CH_(2)`

Solution :Conjugated DIENES have extra stability in which double BONDS are present with ALTERNATE carbon atoms :
`CH_(2) = CH - CH = CH_(2)`
Discussion
6080.

What is the molecular formula of Marshall's acid ?

Answer»

`H_(2)S_(2)O_(8)`
`H_(2)SO_(4)`
`H_(2)SO_(5)`
`H_(2)S_(2)O_(7)`

ANSWER :A
Discussion
6081.

Toluene is more easily nitrated than benzene. Explain.

Answer»

Solution :Nitration is an electrophilic substitution reaction and THUS occurs more readily at a site where the electron-density is more. Now in TOLUENE, there is electron-donating `CH_(3)` group. In other WORDS, the electron-density in the toluene ring is much more than in the benzene ring. as a result, toluene is nitrated more easily than benzene. further since hyperconjugative EFFECT increases the electron-density at o- and p-positions, relative to m-positions, THEREFORE, nitration of toluene gives a mixture of o- and p-nitroluenes.
Discussion
6082.

Which of the following is fier damp

Answer»

Ethane
Ethyne
Methane
Propane.

Solution :Methane explodes violently when MIXED with AIR or oxygen andignitted and this is belived to be the cause of exposions in COAL MINE where methane is known as fire damp.
Discussion
6083.

Which of the following compound does not undergo Cannizzaro reaction ?

Answer»

ETHANOL
METHANAL
Benzaldehyde
2,2,4,4- TETRA METHYL 3- pentanone

Answer :A
Discussion
6084.

Which of the following metals are present in German Silver?

Answer»

NICKEL, SILVER and Copper
Zinc, Silver and Copper
Germanium, Silver and Copper
Zinc, Nickel and Copper

Answer :D
Discussion
6085.

van't Hoff-Charles law.

Answer»

SOLUTION :The LAW states that concentration of a solution remaining constant, the OSMOTIC PRESSURE of a dilute solution is diectlypropor-tional to the absolute temperature .
Discussion
6086.

Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.

Answer»

Solution :Aromatic primary amines react with `HNO_(2)` at `273-278K` to form aromatic diazonium salts.
Aliphatic primary amines also react with `HNO_(2)` at 273-278K to form aliphatic diazonium salts. But these are unstable EVEN at low temperature and thus decomposes readily to form a mixture of compounds consisting of alkyl chlorides, alkenes adn alcholos, out of which alcohols generally predominantes.
`underset("Ethylamine")(CH_(3)CH_(2)NH_(2))+HNO_(2)+HCL underset((-2H_(2)O))overset(273-278K)(to) underset(("unstable"))underset("Ethanediazonium CHLORIDE")([CH_(3)CH_(2)-N-=N]Cl^(-))overset(H_(2)O)(to) underset("Ethanol")(CH_(3)CH_(2)OH)+N_(2)+HCl`
Discussion
6087.

Which of the following is normally not an atmospheric pollutant

Answer»

Carbon monoxide
Carbon DIOXIDE
Sulphur dioxide
Hydrocarbons

Solution :Because carbon dioxide is necessary for photosynthesis in PLANTS and non-harmful for HUMAN BEINGS
Discussion
6088.

[Ti(H_(2)O)]^(2+) is a 3d^(2) system. The value of crystal field stabilization energy decreases by :

Answer»

`4xx10^(-1)Delta_(0)`
`4.0Delta_(0)`
`8.0Delta_(0)`
`8xx10^(-1)Delta_(0)`.

Answer :D
Discussion
6089.

Which has maximum bond order?

Answer»

`H_2`
`N_2`
`F_2`
`O_2`

ANSWER :B
Discussion
6090.

Write the chemical equations to represent the following reactions. (a) The oxidation of HCI (aq) to Cl_(2) (g) by PbO_(2). (b) The disproportionation of SnO to Sn and SnO_(2).

Answer»

SOLUTION :(a)`PbO_(2)+4HCl to PbCl_(2) + 2H_(2)O +Cl_(2)` , (b)`2SnO to Sn+SnO_(2)`.
Discussion
6091.

Which chlorine atom is more electronegative in the following:-

Answer»

`CH_(3)-CL`
`CH_(3)-CH_(2)-Cl`
`H-underset(CH_(3))underset(|)OVERSET(CH_(3))overset(|)(C)-Cl`
`CH_(3)-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Cl`

Solution :Due to +I effect of 3 ALKYL group in option (d), the CHLORINE atom occupy the maximum charge in it so it is more electronegative.
Discussion
6092.

Write the structure of pyrophosphoric acid.

Answer»

Solution :`HO - underset(HO)underset(||)overset(O)overset(||)(P)-O-underset(OH)underset(||)overset(O)overset(||)(P)-OH`Pyrophosphoric `(H_(4)P_(2)O_(7))` ACID.
Discussion
6093.

What are lyophobic colloids? Give examples.

Answer»

Solution :(i) COLLOIDAL solutions in which the dispersed phase has very little affinity for the DISPERSION medium are TERMED as LYOPHOBIC (solvent hating) colloids. (ii) Colloidal solutions of metals which have negligible affinity for solvents and sulphur in water are examples of this type.
Discussion
6094.

Which of the following salts is used in the bead test for basic character ?

Answer»

`NA(NH_4)HPO_4. 4H_2O`
`Na_2HPO_4`
`(NH_4)_2SO_4.FeSO_4.6H_2O`
`(NH_3)_2HPO_4.2H_2O`

ANSWER :A
Discussion
6095.

The standard reduction potentials for Zn^(2+)//Zn,Ni^(2+) and Fe^(2+)//Fe are -0.76,-0.23 and -0.44V respectively. The reaction X+Y^(2+)toX^(2+)+Y will be spontaneous when

Answer»

`X=Ni,Y=Fe`
`X=Ni,Y=Zn`
`X=Fe,Y=Zn`
`X=Zn,Y=Ni`

SOLUTION :`X+Y^(2+)TOX^(2+)+Y`
for reaction to be SPONTANEOUS `E^(o)` must be POSITIVE
`UNDERSET(("Positive"))(E_(zn//zn^(+2))^(o)+E_(Ni^(2+)//Ni)^(o)=0.76+(-0.23)=+0.53)`
Discussion
6096.

Which is not true for a detergent molecule?

Answer»

It has a non-POLAR ORGANIC part and a polar GROUP
It is not easily biodegraded
It is sodium salt of a fatty acid
It is a SURFACE active reagent

Answer :C
Discussion
6097.

Which one of the following would be expected to be highly ionized in water

Answer»

`CH_2ClCH_2CH_2COOH`
`CH_3CHClCH_2COOH`
`CH_3CH_2CHClCOOH`
`CH_3CH_2 C Cl_2 COOH`

ANSWER :D
Discussion
6098.

Which of the following metal nitrate produces gaseous product when reacts with KCN solution?

Answer»

`Cu(NO_(3))_(2)`
`AgNO_(3)`
`CD(NO_(3))_(2)`
`Pb(NO_(3))_(2)`

ANSWER :A
Discussion
6099.

Which electrode is reactive ?

Answer»

Graphite
Carbon
Platinum
SILVER

Solution :Graphite, carbon and platinum are inert electrode.
Silver is REACTIVE electrode.
`Ag_((aq))^(+)+E^(-) to Ag_((S))`. . . (reduction)
`Ag_((S)) to Ag_((aq))^(+)+e^(-)`. . . (OXIDATION)
Discussion
6100.

Which one is wrong ?

Answer»

PVC = Poly Vinyl Chloride
Terylene = Decron
Buna N = STYRENE BUTADIENE RUBBER
PAN = Oron

SOLUTION :Buna N = Styrene Butadiene rubber
Discussion