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16701.

When a mixture of NH_(4)CI, NH_(4) OH and Na_(2) HPO_4was added to a solution containing Mg^(-2)a while precipitate (A) was formed When A was heated strongly reduce B was obtained A & B are .....

Answer»

`Mg(NH_4)PO_4`
`Mg_(2)P_2O_7`
`Mg_(3)(PO_4)_2`
MgO

Solution :`Mg^(2+)+NH_(4)^(+)+OH^(-)HPO_(4)^(2-)+5H_(2)O rarr Mgunderset("WHITE ppt")((NH_4)PO_(4).6H_(2)Odarr)`
`NH_4Cl` is added to prevent the precipitation of `Mg(OH)_2`
Discussion
16702.

The solubility of PbCl_(2) at 25^(@)C is 6.3 xx 10^(-3) mole/litre. Its solubility product at that temperature is

Answer»

`(6.3 xx 10^(-3)) xx (6.3 xx 10^(-3))`
`(6.3 xx 10^(-3)) xx (12.6 xx 10^(-3))`
`(6.3 xx 10^(-3)) xx (12.6 xx 10^(-3))^(2)`
`(12.6 xx 10^(-3)) xx (12.6 xx 10^(-3))`

Solution :`PbCl_(2) rarr Punderset(S)(b^(++)) + UNDERSET(2S)(2Cl^(-))`
`K_(SP) = S xx (2S)^(2) = [6.3 xx 10^(-3)] xx [12.6 xx 10^(-3)]^(2)`.
Discussion
16703.

What happens, whensulphur dioxide gas is passed through an aqueous solution of a Fe(III) salt

Answer»

SOLUTION :`2FE^(3+) + SO_2 + 2H_2O to 2Fe^(2+) + SO_4^(2-) + 4H^(+) `
Discussion
16704.

Which of the following element is present in natural silk but not in artificial silk ?

Answer»

SULPHUR
Chalorine
NITROGEN
HYDROGEN

ANSWER :C
Discussion
16705.

Which of the following is responsible for cough andchoking in human ?

Answer»

SULPHUR
Carbon
Nitrogen DIOXIDE
Sulphur dioxide

SOLUTION :`SO_2` has SUFFOCATING SMELL
Discussion
16706.

Two half reactions of an electro-chemical cell are given below: MnO_4(aq)+8H^+ (aq)+5e^(-) to Mn^(2+) (aq)+4H_2O(l), E^@=+1.51 V, Sn^(2+) (aq) to Sn^(4+) (aq) +2e^(-) E^@=+0.15 V Construct the redox reaction equation from the two half reactions and calculate the cell potential from the standard potentials are predict if the reaction is reactant or product favoured.

Answer»

Solution :Reduction POTENTIAL of the FIRST half REACTION is more than that of the second half reaction,

`E^@=0.15`
`5Sn^(2+)+2MnO_4^(-) to Sn^(4+) +2Mn^(2+)`
`E_(cell)^@=E_(cathode)-E_(ANODE)`
`=1.51-0.15=1.36`
As the cell potential has positive value, the reaction is product favoured and is spontaneous.
Discussion
16707.

Which of the following complexes involves d^(2)sp^(3) hybridisation?

Answer»

`[FeF_(6)]^(3-)`
`[Fe(H_(2)O)_(6)]^(2+)`
`[CR(NH_(3))_(6)]^(3+)`
`[CO(NH_(3))_(6)]^(3+)`

Answer :D
Discussion
16708.

Which of the following statements best explains why a closed balloon filled with He gas rises in air?

Answer»

He is monoatomic gas, where as nearly all molecules that make up air are diatomic eg:
`N_(2),O_(2)` etc.
`U_(avg)` of He is higher than `U_(avg)` of air molecules and higher speeds of COLLISIONS with the balloon walls proped the balloon UPWARD
Because the He atoms are lighter than average air molecules, as a result He (g) is less DENSE than air. The mass of balloon is thus less than the mass of air displaced by its volume.
Because he has lower molar mass that the average air molecules, the He atoms are in faster motion. This means temperature of He is higher than the air temperature, hot gases tend to rise.

SOLUTION :
Discussion
16709.

When treated with ammoniacal cuprous chloride , which one among the following from copper derivative?

Answer»

`C_2H_6`
`C_2H_4`
`C_2H_2`
`C_6H_6`

ANSWER :C
Discussion
16710.

What are the minerals?

Answer»

SOLUTION :These are naturally OCCURRING substances CONTAINING metals or metallic compounds and are OBTAINED by MINING.
Discussion
16711.

Which one of the following is used as anode in Mercury button cell?

Answer»

HGO mixed with GRAPHITE
ZINC AMALGAMATED with mercury
Copper amalgamated with mercury
HgO mixed with Copper

Answer :A
Discussion
16712.

When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two sets t_(2g)(d_(xy),d_(yz),d_(xz))ande_(g)(d_(z^(2)),d_(x^(2)-y^(3))) are either stabilized or destabilized depending upon the nature of magnetic field. It can be expressed diagramatically as : Value of CFS depends upon nature of ligand and a spectro-chemical series has been made experiment-ally, for tetrahedral complexes Delta_(i) is about 4/9 times to Delta_(0) (CFSE for octahedral complexes). The energy lies in visible region and i.e., why electronic transition t_(2_(g))hArre_(g) are responsible for colour. Such transitions are not possible with d^(0) and d^(10) configuration. The value of CFSE (Delta_(a)) for complexes given below follow the order:{:([Co(NH_(3))_(6)]^(3+),[Rh(NH_(3))_(6)]^(3+),[Ir(NH_(3))_(6)]^(3+)),("(I)","(II)","(III)"):}

Answer»

`IltIIltIII`
`IgtIIgtIII`
`IltIIgtIII`
I=II=III

Solution :For a given ligand and CHARGE of metal ion, CFSE increases from top to BOTTOM in a GROUP.
Discussion
16713.

When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two sets t_(2g)(d_(xy),d_(yz),d_(xz))ande_(g)(d_(z^(2)),d_(x^(2)-y^(3))) are either stabilized or destabilized depending upon the nature of magnetic field. It can be expressed diagramatically as : Value of CFS depends upon nature of ligand and a spectro-chemical series has been made experiment-ally, for tetrahedral complexes Delta_(i) is about 4/9 times to Delta_(0) (CFSE for octahedral complexes). The energy lies in visible region and i.e., why electronic transition t_(2_(g))hArre_(g) are responsible for colour. Such transitions are not possible with d^(0) and d^(10) configuration. Cr^(3+) form four complexes with four different ligands which are [Cr(Cl)_(6)]^(3-),[Cr(H_(2)O)_(6)]^(3+),[Cr(NH_(3))_(6)]^(3+) and [Cr(CN)_(6)]^(3-). The order of CFSE (Delta_(a)) in these complexes is :

Answer»

`[CR(Cl)_(6)]^(3-)=[Cr(H_(2)O)_(6)]^(3+)=[Cr(NH_(3))_(6)]^(3+)=[Cr(CN)_(6)]^(3-)`
`[Cr(Cl)_(6)]^(3-)lt[Cr(H_(2)O)_(6)]^(3+)lt[Cr(NH_(3))_(6)]^(3+)lt[Cr(CN)_(6)]^(3-)`
`[Cr(Cl)_(6)]^(3-)gt[Cr(H_(2)O)_(6)]^(3+)gt[Cr(NH_(3))_(6)]^(3+)gt[Cr(CN)_(6)]^(3-)`
`[Cr(Cl)_(6)]^(3-)lt[Cr(H_(2)O)_(6)]^(3+)=[Cr(NH_(3))_(6)]^(3+)lt[Cr(CN)_(6)]^(3-)`

Solution :CFSE `alpha` field STRENGTH of the ligand.
Discussion
16714.

Which of the following can be used as halide component for Friedel-Crafts reaction?

Answer»

ISOPROPYL CHLORIDE
Chlorobenzene
Bromobenzene
Chloroethane

Solution :Only isopropyl chloride is SUITABLE for the Friedel-crafts REACTION. For EXAMPLE. .
Discussion
16715.

Why are rubbers called elastomers ?

Answer»

Solution :Rubbers get strectched on application of force and REGAIN original state after the force is withdrawn. THEREFORE , these are CALLED elastomers.
Discussion
16716.

Which of the following molecules can exhibit conformational isomerism?

Answer»

`CH_(3) OH`
`H_(2) O_(2)`
`NH_(2) - NH_(2)`
All of these

Solution :All the THREE EXHIBIT conformational isomerism due to rotation about C-O bond in `CH_(3)`OH, O - O bond in `H_(2) O_(2)` and N - N bond in `NH_(2) - NH_(2)` .
Discussion
16717.

Which of the following is not a transition element ?

Answer»

Zn
Ru
Ag
Pb

Answer :d
Discussion
16718.

Which of the following conformer of n-Butane is associated with maximum potential energy.

Answer»

Gauch
partially eclipsed
Anti
FULLY eclipsed

Solution :Because bigger methyl GROUPS COME CLOSER to each other in fully ellipsed conformer.
Discussion
16719.

Thevapourpressureof 2.1% solutionof a non- electrolyte in waterat 100^(@) C is755mm Hg. Calculatethe molarmass of thesolute .

Answer»

<P>

Solution :At `100^(@)C`vapourpressure of WATER`=P_(o)`= 760mm Hg
VAPOURPRESSUREOF the solutions= P= 755 mm Hg
Sincethe solutionis 2.1by mass
Mass of solute (non- electrolyte) =`W_(2) =2.1 g`
Mass ofwater`=W_(1) =100 -2.1 =97.9 g`
Molarmass ofwater= `M_(1) =18 g mol^(-1)`
Molarmass ofnon- electrolyte `=M_(2)= ?`
`(P_(o) -P)/(P_(o)) = (W_(2) xx M_(1))/(W_(1) xx M_(2))`
`:.M_(2)= ((P_(o))/(P_(o) - P)) xx (W_(2) xx M_(1))/(W_(1)) = (700xx 2.1 xx 18)/((760 -755) xx 97.9) = 58.69 g mol^(-1)`
Discussion
16720.

The volume of nitrogen gas at 0^(@)C and 1.013 bar required to cover a sample of silica gel with unimolecular layer is 129 cm^(3) g^(–1)of gel. Calculate the surface area per gram of the gel if each nitrogen molecule occupies 16.2 xx 10^(–20) m^(2).

Answer»

Solution :`568m^(2)G^(-1)`
`PV=nRT`
`1.013 XX 0.129 = n xx 0.0821 xx 273`
`n=0.00583` MOL
AREA occupied
`=0.00583 xx 6.023 xx 10^(23) xx 16.2 xx 10^(-20)`
Discussion
16721.

Which one of the following is not a semi- synthetic polymer ?

Answer»

CELLULOSE nitrate
RESIN
Rayon
Vulcanised RUBBER

SOLUTION :Resin
Discussion
16722.

Which buffer solution out of the following will have pH gt 7

Answer»

`CH_(3)COOH + CH_(3)COONa`
`HCOOH + HCOOK`
`CH_(3)COONH_(4)`
`NH_(4)OH + NH_(4)Cl`

ANSWER :D
Discussion
16723.

Unitcell of theironcrystal hasedgelengthof 288pmanddensityof 7.86 g cm^(-3). Determinte the typeof crystal lattice. Atomicmass ofFe= 56 g mol^(-1)

Answer»


Solution :Given : Edgelength =a= 288 pm `=2.88 XX 10^(-8)` cm
Densityof crystal = d= 7.86 g `cm^(-1)`
A vogadro number= 6.022 `xx10^(-23) mol^(-1)`
Atomicmass ofFe= 56 g `mol^(-1)`
Typeof crystallattice = ?
Massof one Fe atom = `(56)/(6.022 xx 10^(23)) = 9 .3 xx 10^(-23) g`
If thereare z atoms in the unitcell , then
Massof unitcell=mass ofz atoms = z `xx 9.3 xx 10^(-23) g`
Volumeof unitcell `= a^(3)= (2.88 xx 10^(-8) )^(3)`
`=23 .88 xx 10^(-24) cm^(3)`
Densityof unitcell`d= ("massof unit CELL")/("Volumeof unitcell")`
`7.86 = (z xx 9.3 xx 10^(-23))/(23. 88 xx 10^(-24))`
`:. z =(7.86 xx 23.88 xx 10^(-24))/(9.3xx 10^(-23))= 2.01 =2`
Sincethe numberof atomsin THEUNIT cellis 2,thecrystal latticemust be of bcctype.
Discussion
16724.

Which functional group participates in disulphide bond formation in proteins ?

Answer»

THIOETHER
THIOL
Thioester
Thiolactose

ANSWER :B
Discussion
16725.

Which of the following influence the rate of reaction a. Nature of reactants b. Concentration of rectants c. Temperature D. Molecularity

Answer»

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

Answer :D
Discussion
16726.

When 1.80 g of non-volatile compound is dissolved in 25.0 g of acetone, the solution boils at 56.86^(@)C while pure acetone boils at 56.38^(@)C under the same atmospheric pressure. Calculate the molar mass of compound. The molal elevation constant for acetone is 1.72^(@).

Answer»

SOLUTION :`"258 G MOL"^(-1)`
Discussion
16727.

Transition elements form stable complexes because….

Answer»

They are LOW electronegative elements
They are low ionization enthalpies
The charge/radius RATIO is HIGH and have vacant d-orbitals
They show VARIABLE valencies

Answer :C
Discussion
16728.

Whichof the followingreacts withan aqueoussolutionof [Ag(NH_(3))_(2) ]OH?

Answer»

`CH_(3) =C CH_(3)`
`CH_(3) CH= CHCH_(3)`
`CH_(3) CH=CH_(2)`
`CH_(3) CH_(2) =CH`

ANSWER :D
Discussion
16729.

Which oxide of nitrogen is coloured gas

Answer»

`N_(2)O`
`NO`
`N_(2)O_(5)`
`NO_(2)`

SOLUTION :`NO_(2)` brown COLOURED GAS.
Discussion
16730.

Which of the following reagent produces pure alkyl halides when heated with alcohols?

Answer»

`PCl_5`
`PCl_3`
`SOCl_2`
dry HCl

Solution : Thionyl chloride is preferred because the other TWO products formed in the reaction are escapable GASES. Hence the reaction gives PURE alkyl HALIDES
`ROH+SOCl_(2)rarrR-Cl+SO_2uarr+HCluarr`
Discussion
16731.

Which of the following is a genetic trait in man:

Answer»

ALBINISM
Leucoderma
Tuberculosis
Diphtheria

Answer :A
Discussion
16732.

Which of the following is not fatty acid ?

Answer»

propionic ACID
BUTYRIC acid
ISO-butyric acid
iso - PHTHALIC acid

ANSWER :D
Discussion
16733.

Which one of the following chlorohydrocarbons readily undergoes solvolysis?

Answer»

`CH_(2)=CHCL`


Solution :Solvolysis of haloalkanes follow first ORDER kinetic. During this PROCESS an intermediate carbocation is formed. Therefore, the halohdrocarbon which given more STABLE carbocation undergoes solvolysis READILY.
Discussion
16734.

Which is the major product obtained by hydrolysis of compound formed by reaction between formaldehyde and ethyl magnesium bromide ?

Answer»

Ethan-1-ol
Propan-2-ol
Propan-1-ol
2-Methyl-propan-2-ol

Solution :Propan-1-ol
Discussion
16735.

When nitrobenzene is treated with bromine, it gives :

Answer»

TOLUENE
o-Nitrobromobenzene
m-bromonitrobenzene
BROMOBENZENE

ANSWER :C
Discussion
16736.

What products are obtained in a crossed Cannizzaro reaction, involving HCHO and C_(6)H_(5)CHO ?

Answer»

Solution :The PRODUCTS obtained are `C_(6)H_(5)CH_(2)OH and HCOO^(-)`. This is because formaldehyde is a good reducing AGENT and reduces BENZALDEHYDE to benzyl alcohol
Discussion
16737.

Write the equation for the reaction between benzaldehyde and concentrated NaOH solution. Name the reaction.

Answer»

SOLUTION :
Cannizzaro.s REACTION
Discussion
16738.

Which one of the following is used as an antiseptic - carbolic lotion and carbolic soaps?

Answer»

BENZYL ALCOHOL
METHANOL
GLYCOL
PHENOL

Solution :Phenol
Discussion
16739.

Which of the following species represent the example of dsp^(2)-hybridisation?

Answer»

`[FE(CN)_(6)]^(3-)`
`[Ni(CN)_(4)]^(2-)`
`[Ag(CN)_(2)]^(-)`
`[Co(CN)_(6)]^(3-)`

Answer :B
Discussion
16740.

What is the pH of 0.1M HCL solution?

Answer»

1
2
13
3

Solution :`[H_3O^+]=0.1M`
`pH=-log_10[H_3O^+]=-log_10[0.1]`
`=-log_10[10^-1]`
pH=1
Discussion
16741.

The shape and bond angle of ammonia are

Answer»

Tetrahedral and `109^(0)28^(1)`
Tetrahedral and `107^(0)48^(1)`
PYRAMIDAL and `107^(0)18^(1)`
Pyramidal and `109^(0)28^(1)`

Answer :3
Discussion
16742.

Which is not a colligative property?

Answer»

RELATIVE LOWERING of vapour pressure
Freezing POINT
Osmotic pressure
Elevation of boiling point

Answer :B
Discussion
16743.

Write short notes on Gomberg reaction.

Answer»

SOLUTION :Gomberg REACTION : Benzene DIAZONIUM chloride reacts with benzene in the presence of sodium HYDROXIDE to GIVE biphenyl. This reaction in known as the Gomberg reaction .
Discussion
16744.

Variation of resistance with cell constant is given in which of these graphs?

Answer»




ANSWER :C
Discussion
16745.

What is formalin? Write its use.

Answer»

Solution :(i) 40% aqueous solution of FORMALDEHYDE is known as FORMALIN.
(ii) It is USED as a PRESERVATIVE for biological specimens and in LEATHER tanning.
Discussion
16746.

Which of the following substance is used in measurement of Chemical Oxygen Demand (COD) in polluted water?

Answer»

`H_(2)SO_(4)`
`KMnO_(4)`
`MnO_(2)`
`K_(2)Cr_(2)O_(7)`

ANSWER :D
Discussion
16747.

Which of the following is a simple ether ?

Answer»

`CH_3OCH_3`
`C_2H_5OCH_3`
`C_6H_5OCH_3`
`C_6H_5OC_2H_5`

ANSWER :A
Discussion
16748.

Which one of the following is used in the prevention of heart attacks?

Answer»

ASPIRIN
ibuprofen
paracetamol
morphine

Solution :aspirin
Discussion
16749.

Which isomer of [CoCl_(2)(en)_(2)]^(+) does not show optical isomerism ?

Answer»

Solution :TRANS ISOMER does not SHOW optical ISOMERISM
Discussion
16750.

The shape of [Fe(H_(2)O)_(6)]^(2+) and [COF_(6)]^(4-) is ...................

Answer»


ANSWER :OCTAHEDRAL
Discussion