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5601.

Whatis thevolumeofoxygenrequiredfor thecomplete combustonof 4 litre of ethane?

Answer»

4 LITRE
8 litre
12 litre
14 litre

ANSWER :D
Discussion
5602.

X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608 xx 10^(-8) cm. In a separate experiment, copper is determined to have a density of 8.92 "g/cm"^3, calculate the atomic mass of copper.

Answer»

Solution :The NUMBER of atoms per UNIT cell (Z) = 4
`thereforeM = (d xx N_A xx a^3)/(Z)`
`THEREFORE M =((6.022 xx 10^(23) "atoms mol"^(-1)) (3.608 xx 10^(-8) "cm")^3)/("4 atoms")`
`therefore` M = 63.1 g/mol
Atomic mass of copper = 63.1 u
Discussion
5603.

Which one of the following is the lighest?

Answer»

0.2 mole of HYDROGEN gas
`6.023xx10^(22)` molecules of nitrogen
0.1 g of silver
0.1 mole of oxygen gas

Solution :(a) `0.2" mole of "H_(2)=0.2xx2g=0.4g`
(b) `6.02xx10^(22)" molecules of N"_(2)`
`=(28)/(6.02xx10^(23))xx6.02xx10^(22)=2.8g`
(c) `"0.1 g of silver = 0.1 g"`
(d) `"0.1 mole of O"_(2)=0.1xx32=3.2g`
(e) 1 g `H_(2)O=1`
Thus, g of silver is the lighest.
Discussion
5604.

Write the steps and conditions involved in the following conversion . Acetophenone to 2- phenyl -2-butanol

Answer»

SOLUTION :
Discussion
5605.

Time taken for consumption of half of the initial concentration is 20 seconds for a first order reaction .What will be the time taken by the same reaction to get the concentration of reactant from 0.123 M to 0.0625 M.

Answer»

5 sec
20 sec
10 sec
40 sec

Answer :B
Discussion
5606.

Which of the following statements is wrong concerning ideal solutions ? Ideal solutions can be formed when their components

Answer»

have zero heat of mixing
have zero VOLUME CHANGE on mixing
obey RAOULT's law
can be converted into ideal gases.

Answer :D
Discussion
5607.

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

Answer»

Exothermic and decreasing disorder
Endothermic and increasing disorder
Exothermic and increasing disorder
Endothermic and decreasing disorder

Solution :If reaction is exothermic, then, `DeltaH` is -ve and on increasing disorder `DeltaS` is +ve THUS, at these condiition, `DeltaG` is negative according to follow equation.
`DeltaG=DeltaH-TDeltaS`
`DeltaG=-ve`. HENCE, for spontaneous reaction, `DeltaG` MUST be -ve.
Discussion
5608.

Tranquillizers.

Answer»

SOLUTION :Tranquillizers are used to treat MENTAL tension anxiety, MANIA (disorderof mood), INSOMNIA (sleeping sickness), feeling DISCOMFORT.
Discussion
5609.

Which among the following statement is correct?

Answer»

MAGNITUDE of crystal FIELD splitting energy depends only on LIGAND field.
Lower CFSE favour FORMATION of low spin complex.
`t_(2g) ` orbitals are three fold degenerate while eg orbitals and TWO fold degenerate
all the above

Answer :C
Discussion
5610.

Which is a condensation polymer?

Answer»

PVC
Teflon
Bakelite
None of these

Answer :C
Discussion
5611.

Zr and Hf almost equal atomic and ionic radii because:

Answer»

Of diagonal relationship
Both are in same group
Of LANTHANIDE contraction
They have similar chemical properties

Answer :C
Discussion
5612.

Which of the following pairs has the same size

Answer»

`FE^(2+), Ni^(2+)`
`ZR^(4+),TI^(4+)`
`Zr^(4+),Hf^(4+)`
`Zn^(2+),HI^(4+)`

Answer :C
Discussion
5613.

The sum of the number of lone pairs of electrons on each central atom in the following species is [TeBr_(6)]^(2-), [BrF_(2)]^(+), SNF_(3) and [XeF_(3)]^(-) (Atomic numbers : N = 7, F = 9, S = 16, Br = 35, Te = 52, Xe = 54)

Answer»


ANSWER :6
Discussion
5614.

The species in which the central atom uses sp? hybrid orbitals in its bonding is

Answer»

`SO_2`
`PH_3`
`NH_3`
`SbH_3`

ANSWER :A
Discussion
5615.

Which of the followings is a trihydric alcohol?

Answer»

n-propyl alcohol
Glycerol
GLYCOL
GLYCINE

ANSWER :B
Discussion
5616.

Which statement is not true about potash alum ?

Answer»

It's empirical formula is `KAl(SO_4)_2).12H_2O`
It's AQUEOUS solution is BASIC in nature
It is USED in dyeing industries
On HEATING it melts and loses in water of crystallization

Answer :B
Discussion
5617.

Write the name or formula of the following: A trihydric alcohol

Answer»

SOLUTION :
Discussion
5618.

Write the IUPAC name ofC_(6)H_(5)-underset(CH_(3))underset("|")"N -CH_(3)

Answer»

SOLUTION :N,N -DIMETHYLANILINE.
Discussion
5619.

Which of the following is likely to have lowest p^(Ka) value

Answer»




SOLUTION : is strongestacidas itreduces Bayer.sstrain
Discussion
5620.

What is Half-Life time of a reaction ?Derive the equation of Half -Life time(t_((1)/(2))) for zero order reaction.

Answer»

Solution :Half-LIFE time:The half-life of a reaction is the time in which the concentration of a reactant is reduced to one half of its intial concentration it is called half life and REPRESENTED as `(t_((1)/(2)))` .
To derive `t_((1)/(2))` EQUATION of zero -order reaction:
For a zero order reaction,rate constant (k) is given by following equation .
`k=([R]_(0)-[R])/(t)`.........(a)
Where t=half life time =`t_((1)/(2))`.....(i)
`[R]_(0)` =The concentration of reactant
at t=0 time....(ii)
[R]=The concentration of reactant at `t_((1)/(2))` time
=`(1)/(2)` initial concentration `[R]_(0)`
`therefore [R]=(1)/(2)[R]_(0)`......(iii)
Put these value in (a)
`k=([R]_(0)-(1)/(2)[R]_(0))/(t_(1)/(2))`
`therefore k=(1[R]_(0))/(2xxt_((1)/(2)))` and
`t_((1)/(2))=([R]_(0))/(2k)` (half life of zro ordr reaction)
It is clear that `t_((1)/(2))` for a zero order reaction is directly proportional to the inital concentration of the reactants and iversely proportional to the rate constant.
Discussion
5621.

Which of the following pairs of cations can be separated by using an NaOH solution?

Answer»

`Cu^(2+), Zn^(2+)`
`Pb^(2+), Al^(3+)`
`Sn^(2+), Pb^(2+)`
`Zn^(2+), Hg_(2)^(2-)`

ANSWER :A
Discussion
5622.

The setting of cement under water is essentially a/an:

Answer»

OXIDATION process
Reduction process
Double DECOMPOSITION process
Hydration process

Answer :D
Discussion
5623.

Thetreatment of CH_(3)MgX withCH_(3)-C-=C--Hproduces :

Answer»

`CH_(4)`
`CH_(3)HC=CH_(2)`
`CH_(3)-C-=C-CH_(3)`
`CH_(3)Hc=CHCH_(3)`

ANSWER :A
Discussion
5624.

Thereaction, 1//2Hg_(2)(g)+AgCl(s)=H^(+)(aq)+Cl^(-)(aq)+Ag(s) occurs in the galvanic cell

Answer»

`Ag|AgCl(s)|KCl("SOLN")|AgNO_(3)("soln")|Ag`
`Pt|H_(2)(G)|HCL("soln")|AgNO_(3)("soln")|Ag`
`Pt|H_(2)(g)|HCl("soln")|AgCl(s)|Ag`
`Pt|H_(2)(g)|KCl("soln")|AgCl(s)|Ag`

Solution :`H_(2)` UNDERGOES oxidation and `AgClAg^(+))` undergoes reduction.
Discussion
5625.

What happens when ammonium dichromate crystals are heated? Give equation.

Answer»

Solution :Ammonium DICHROMATE CRYSTALS heating give nitrogen gas .
`(NH_(4))_(2)Cr_(2)O_(7)rarrCr_(2)O_(3)+4H_(2)O+N_(2)`
Discussion
5626.

Which of following statements is false ?

Answer»

Density of white phosphorus is LESS than that of RED phosphorus
White phosphorus is SOLUBLE in `CS_2`, but red phosphorus is insoluble in `CS_2`
Both red and white phosphorus evolves `PH_3` on heating with NAOH solution
White phosphorus show phosphorescence, while red phosphorus does not show phosphorescence.

Answer :C
Discussion
5627.

Tne relation between internal energy change, /_\E and enthalpy change' /_\H and work W is

Answer»

`/_\H=/_\E+W`
`/_\E=/_\H-W`
`/_\E=W-/_\H`
`/_\H = /_\E-W`

ANSWER :A
Discussion
5628.

Which one of the following polymersmolecules contain more double bonds in the polymer chain in the repeating unint.

Answer»

POLYSTYRENE
BuNa-S
PVC
POLYETHYLENE

ANSWER :B
Discussion
5629.

What is the correct order of velocity of alpha (alpha) and, " beta" (beta) and gamma (gamma) rays

Answer»

`ALPHA gt beta gt gamma`
`alpha gt gamma beta`
`gamma gt alpha gt beta`
`gamma gt beta gt alpha`

Solution :The velocity of `alpha`-rays are `~ (1)/(10)` th of that of light, that of `beta-`rays are `~(1)/(3) " to " (9)/(10)` th of that of light. The velocity of `gamma`-rays are same as that of light
Discussion
5630.

What is correct ratio of Ni^(2+) ions to Ni^(3+) ions in Ni_(0.98)O ?

Answer»

`24 : 1 `
`1:4 `
`47 : 3 `
`47 : 2 `

Solution :Let, NUMBER of `N i^(2+)` IONS = X
Number of `N i^(2+)` ions `= (98 - x)`
As COMPOUND is neutral, `3(98 - x) + 2x = 2 xx 100`
`therefore x = 94`
Number of `N i^(2+)` ions = 94
Number of `N i^(2+)` ions = 4
RATIO of `N i^(2+)` ions to `N i^(2+)` ions `= 94 : 4 = 47 : 2 `
Discussion
5631.

Write various isomers of C_(7)H_(7)Cl containing benzene ring. Which of these has weakest C-Cl bond ?

Answer»

SOLUTION : The VARIOUS ISOMERS :

Out of these has the WEAKEST C-Cl BAND.
Discussion
5632.

Which of the following is true for N_2O_5 ?

Answer»

It EXISTS in SOLID STATE in the form of [`NO_2] [NO_3]`
It is a brown gas
It is an ANHYDRIDE of `HNO_2`
It is paramagnetic

Answer :A
Discussion
5633.

Two bubles B_(1) and B_(2) of equal capacity contain 10 g oxgyen (O_(2)) and ozone (O_(3)) respectively. Which bulb will have greater number of O-atoms and which will have greater number of molecules?

Answer»

Solution :`"10 G O"_(2)=(10)/(32)"MOLE"=(10)/(32)xx6.02xx10^(23)" molecules"=1.88xx10^(23)" molecules"`
` = 2xx1.88xx10^(23)" atoms"=3.76xx10^(23)" atoms"`
`"10 g O"_(3)=(10)/(48)" mole"=(10)/(48)xx6.02xx10^(23)" molecules"=1.254xx10^(23)" molecules"`
`=3xx1.254xx10^(23)" atoms"=3.76xx10^(23)" atoms"` ltBrgt Thus, both contain the same bumber of atoms but bulb `B_(1)` contains more NUMBER of molecules.
Discussion
5634.

Whatis the molarconductivity of Aglat zeroconcentrationif the ^^_(0) valuesof NaI, AgNO_(3)and NaNO_(3) arerespectively126.9 Omega^(-1) cm^(2)mol^(-1),133.4 Omega^(-1) cm^(2) mol^(-1)and121.5 Omega^(-1) cm^(2)mol^(-1)?

Answer»


Solution :Given : `^^_(o_((NAI)))= 126. 9 OMEGA^(-1)cm^(2) MOL^(-1)`
` ^^_(o_((AgNO_(2)))) = 133.4 Omega^(-1)cm^(2)mol^(-1)`
`^^_(o_((NaNO_(3)))) = 121. 5 Omega^(-1)cm^(2)mol^(-1)`
ByKohlrausch'slaw
`^^_(o_((Agl))) = lambda_(Ag^(+))^(o) +lambda_(i^(-))^(0) ""......(I)`
`^^_(o_((NaI)))= lambda_(Ag^(+))^(0) +lambda_(I^(-))^(0) ""......(i)`
`^^_(o_((AgNO_(3))))= lambda_(Ag^(+))^(0) + lambda_(I^(-))^(0)""......(ii)`
`^^_(o_((NaNO_(3))))= lambda_(Na^(+))^(0) + lambda_(NO_(3))^(3)`
Addingequation(i) and(ii) andsobtractingequation (iii)we getequation I.
`^^_(0_((Agl)))= ^^_(0_((NaI))) + ^^_(0_((AgNO_(3)))).^^(0_((NaNO_(3)))`
`= 126.9 + 133.4 - 121 .5 `
`=138. 8 Omega^(-1)cm^(2) mol^(-1)`
Discussion
5635.

When the vapours of chromyl chloride are passed through NaOH solution, it turns yellow. This is due to the formation of

Answer»

`Na_(2)CrO_(4)`
`Na_(2)Cr_(2)O_(7)`
`CrCl_(3)`
`CrO_(2)Cl_(2)`

ANSWER :A
Discussion
5636.

Which of the following is correct regarding [Pt(NH_(3))_(2)(CN)_(2)] ?

Answer»

It exhibits linkage ISOMERISM as well as geometrical isomerism.
It exhibits optical isomerism.
It exhibits ionisation isomerism.
It exhibits only linkage isomerism.

Solution :`[Pt(NH_(3))_(2)(CN)_(2)][Pt(NH_(3))_(2)(NC)_(2)]`
Linkage isomers

`[Pt(NH_(3))_(2)(CN)_(2)]DSP^(2)`, SQUARE planar complex it has PLANE of symmetry so it will not EXHIBIT optical isomerism.
Discussion
5637.

whatis the molarconductivity of Aglat zeroconcentrationif the ^^_(0) valuesof NaI, AgNO_(3)and NaNO_(3) arerespectively126.9 Omega^(-1) cm^(2)mol^(-1),133.4 Omega^(-1) cm^(2) mol^(-1)and121.5 Omega^(-1) cm^(2)mol^(-1)

Answer»


Solution :Given : `E_(C1_(2))^(0)= 1.36 V , E_(Ni_(2+)//Ni)^(0)= - 0.25 N,`
`E_("Cell ")^(0)=?`
`Ni_((s))|Ni^(2+) (1M) "||" C1^(-) (1M)| C1_(2(G)) (1 atm) |Pt`
`((" At LHE " Ni_((s)) to Ni_((ag)^(2+)+ 2e^(-)))/(" At RHE(.(1)/(2) C1_(2(g))+ E^(-) to C1^(-)_(ag))xx2))/(Ni_((s) + C1_(2(g)) ) to Ni_((ag))^(2+) + 2C1_((ag))^(-))`
Thestandardemf isgiven by
`E_(" Cell ) ^(0)= E_(cathode)^(0)- E_(ANODE)^(0)`
`=E_(C1_(2)//C1^(-))^(0) -E_(Ni^(2+)//Ni)^(0)`
`= 1.36- (-0.25)`
`=1.36+ 0. 25 = 1.61 V`
Discussion
5638.

Using Bohr theory, calculate the radii of the first and the tenth orbits in the hydrogen atom

Answer»

SOLUTION :`(r_(1)= 0.53 xx 10^(-8)cm, r_(10)=0.53 xx 10^(-6)cm)`
Discussion
5639.

Which of the following has the highest nucleophilicity ?

Answer»

`F^-`
`OH^-`
`CH_3^-`
`NH_2^-`

ANSWER :C
Discussion
5640.

Which of the following is more stable ?

Answer»

`Sn^(4+)`
`PB^(4+)`
`Ge^(4+)`
`Si^(4+)`

Answer :B
Discussion
5641.

Which of the following is structural protein ?

Answer»

MYOSIN
INSULIN
Thyroglobulin
Albumin

ANSWER :A
Discussion
5642.

Which of the following reactions is//are correct?

Answer»

a.
b.
c.
d.

Solution :It is an example of Kolbe's reaction.

So both the products are correct.
`(snCl_(2)+HCl)` selectively reduces `(-NO_(2))` GROUP ortho to `(Me-) (EDG)` group, but `(NH_(4)SH)` selectively reduces `(-NO_(2))` group para to `(Me-) (EDG)` group. So both the products are correct.
c. DUE to `(+I)` effect of three `(Me-)` groups, the benzene the ring is activated and is unstable. So the oxidation of benzene ring TAKES place, while due to the absence of benzylic H atom in t-butyl group, the oxidation of side chain does not take place. So the products `(II)` and `(III)` are correct, but product `(I)` is wrong. So the answer `(c )` is wrong.
d.In acidic medium `(Sn+HCl)`, the `(-NO_(2))` group is reduced to `(-NH_(2))` group. So product `(I)` is correct. In neutral medium `(Zn+NH_(4)CL` or `Al-Hg(H_(2)O), (NO_(2))` group is reduced to `(NHOH)` group. So product `(II)` is correct.
In basic with `Na_(3)AsO_(3)+overset(ɵ)(O)H, (-NO_(2))` group is converted to azoxy group, so product `(III)` is correct. Hemce, the answer are `(a), (b)`, and `(d)`.
Discussion
5643.

Which acid derivatives will form hydrogen bonding in its molecule :

Answer»

ACID chloride
Acid anhydride
Acid amide
All

Answer :C
Discussion
5644.

Which of the following is not true for CoF_(6)^(3-) ?

Answer»

It is paramagnetic due to the presence of 4 UNPAIRED electrons.
It has coordination number of 6.
It is outer orbital COMPLEX.
It involves `d^(2)sp^(3)` hybridisation.

Solution :It is outer orbital complex and involves `sp^(3)d^(2)` HYDRIDISATION
Discussion
5645.

Write IUPAC name of [Co(NH_(3))_(5)Cl]Cl_(2).

Answer»

SOLUTION :pentamminechloridocobalt (III) CHLORIDE.
Discussion
5646.

Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800 K.

Answer»

Solution :The FOLLOWING reaction takes place in the temperature range of 500-800 K.
`3Fe_(2)O_3 + CO to 2Fe_(3)O_(4) + CO_2`
`Fe_(3)O_(4) + 4CO to 3Fe + 4CO_2`
`Fe_(2)O_(3) + CO to 2FeO + CO_2`
Discussion
5647.

Which of the following statement(s) is/are correct with reference to Fe^(2+) and Cu^(2+)

Answer»

Both react with NaOH
`Cu^(2+)` GIVES BLUE ppt of `Cu(OH)_(2)` where as `FE^(2+)` gives `Fe(OH)_(2)` [green ppt]
`Cu^(2+)` gives CHOCOLATE brown ppt whereas `Fe^(2+)` gives sky blue ppt with `K_(4)[Fe(CN)_(6)]`
Both have four unpaired electrons

Solution :`Fe^(2+)+2NaOHrarr underset("(green ppt.)")(Fe(OH)_(2))+2Na^(+)`
`Cu^(2+)+2NaOHrarrunderset("(blue ppt.)")(Cu(OH)_(2))+2Na^(+)`
(b) is correct as explained above.
(a) is also correct as both react with `NaOH`.
`2Cu^(2+)+K_(4)[Fe(CN)_(6)] rarr underset("(chocolate brown ppt.)")(Cu_(2)[Fe(CN)_(6)])+4K^(+)`
`2Fe^(2+)+K_(4)[Fe(CN)_(6)]rarr underset("(sky blue ppt.)")(Fe_(2)[Fe(CN)_(6)])+4K^(+)`
(d) is not correct `because Cu^(2+)` has 1 unpaired electron whereas `Fe^(2+)` has 4 unpaired electrons.
Discussion
5648.

The role of fluorspa, which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite is to

Answer»

ACT as a catalyst
make fused MIXTURE conducting.
lower the MELTING temperature of the mixture.
decrease the rate of OXIDATION of carbon at anode.

Solution :Both these options are correct.
Discussion
5649.

Which of the following is/sre not corrcet regarding the product formation ?

Answer»

product is recemic mixture
products are diastereomers
product is a SINGLE stereoisomer
product is a meso-compound

Solution :The configuration of one of the chiral center does not changes during course of the REACTION HENCE diastereomers are formed.
Discussion
5650.

Which of the following compounds undergoes replacement of -Cl by -OH by merely warming thecompound with aqueous NaOH?

Answer»




SOLUTION : Trinitro chlorobenzene is more easily under GO nucleophilic substitution REACTION DUE to E.W.G.S
Discussion