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9251.

Two unimolecular reactions, I and II have the same rate constant at 25^(@) C but E_(a) for reaction I is larger than E_(a)for reaction II . Which statement about these two reaction is correct?

Answer»

`k_("REACTION I")` is the same as `k_("reaction II")` at all temperatures.
`k_("reaction I")` is LARGER than `k_("reaction II")` at lower temperatures but smaller at higher temperatures.
`k_("reaction I")` is smaller than `k_("reaction II")` at lower temperatures but larger at higher temperatures.
`k_("reaction I")` is larger than `k_("reaction II")` at temperatures both lower and higher than `25^(@)` C.

Answer :D
Discussion
9252.

Which of the following chemical equation represents the formation of colloidal solution

Answer»

`Cu+CuCl_2toCu_2Cl_2`
`2Mg+CO_2to2MgO+C`
`2HNO_3+3H_2Sto3S+4H_2O+2NO`
Both (B) and (C )

ANSWER :C
Discussion
9253.

Which of the following is a fully flourinated polymer?

Answer»

THIOKOL
Teflon
Neoprene
`PVC`

ANSWER :B
Discussion
9254.

Which of the following is primary halide:

Answer»

ISOPROPYL HALIDE
sec BUTYL halide
ter-butyl halide
Neo-hexyl halide

Answer :D
Discussion
9255.

Which of the following is not tetrahedral in shape?

Answer»

`NH_(4)^+`
`SiCl_4`
`SF_4`
`SO_(4)^(2-)`

Solution :`SF_4` has trigonal bipyramidal geometry in which one position is OCCUPIED by a LONE pair of ELECTRONS.
Discussion
9256.

Which of the following carbonyl compounds can give two oximes on reaction with hydroxyl amine?

Answer»

HCNO
`CH_(3)CHO`
PhCHO
`CH_(3)COPh`

ANSWER :B::C::D
Discussion
9257.

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The weight of A is 0.5 g and that of B is 0.2 g. The total pressure of the mixture is 750 mm. Calculate the partial pressure of the two gases.

Answer»

SOLUTION :Mole of `A = (0.50)/(60) = 0.0083`
Mole of B `= (0.20)/(45) = 0.0044`
Total mole = 0.0127
Total PRESSURE = 750 mm.
Partial pressure of `A = ("MOLES of A")/("total moles") XX "total pressure"`
`= (0.0083)/(0.0127) xx 750 = 490 mm`.
Partial pressure of B `= ("0.0044)/(0.0127) xx 750 = 260 mm`
Discussion
9258.

What is the concentration of dissolved oxygen at 25^(o)C at 1 atm pressure if partial pressure of oxygen in 0.22 atm?(K_(H) = 1.3 xx 10^(-3)" mol "dm^(-3) atm^(-1))

Answer»

<P>`2.86 XX 10^(-4) M`
`5,9 xx 10^(-3)M`
`1.7 xx 10^(-4)`
zero

Solution :A/c. to Henry's law
`S = K xx P`
`= 1.3 xx 10^(-3) xx 0.22`
`= 2.86 xx 10^(-4) "mol" dm^(-3)`
`=2.86 xx 10^(-4) M`
Discussion
9259.

Which of the following complexes can exhibit optical isomerism?(e n=H_(2)N-CH_(2)-CH_(2)-NH_(2))

Answer»

`CIS-[CO(NH_(3))_(4)Cl_(2)]`<BR>`[Co(NH_(3))_(3)Cl_(3)]`
`cis-[Co(EN)_(2)Cl_(2)]`
trans `-[Co(en)_(2)Br_(2)]`

Solution :`cis-Co(e n)_(2)Cl_(2)`
Discussion
9260.

We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentrations O.lM, 0.01M and 0.001M, respectively. The value of van't Hoff factor for these solutions will be in the order "_________"

Answer»

`i_(A) LT i_(B) lt I _(C)`
`I _(A) GT I _(B) gt i_(C)`
`I _(A) = I _(B) =i_(C )`
`I _(A) lt I _(B) gt I _(C )`

ANSWER :C
Discussion
9261.

Vinegar is dilute aqueous solution of

Answer»

Ethanoic
Benzoic acid
Citric acid
Oxalic acid.

Answer :A
Discussion
9262.

When steam is passed over red hot iron, the substance formed are:

Answer»

`Fe_(2)O_(3)+H_(2)`
`Fe_(3)O_(4)+H_(2)`
`FeO+H_(2)`
`FeO+H_(2)+O_(2)`

Answer :B
Discussion
9263.

Which is the order of isomerisation of cycloprapane ot propene ?

Answer»

`CH_3CHO_((g))rarrCH_(4(g))+CO_((g))`
`2H_2O_(2_((aq)))rarrH_2O_((l))+O_(2(g))`
`CH_3COOHCH_(3(aq))+H_2O(l)overset(H^+)rarrCH_3COOH_((aq))+CH_3OH_((aq))`
Isomerisation of CYCLO propane to propene

Answer :C
Discussion
9264.

Weight of Urea required 200ml of 2 M solution will be

Answer»

12 gm
24 gm
20 gm
60 gm

Solution :Molarity `= (W_(B))/(M_(B))xx(1000)/(V_((ml)))`
V = 200 ml
Molarity = 2 M and `M_(B) = 60 g`
`W_(B) = (M_(B)xx V_((ml))xx" Molarity")/(1000)=(60xx200xx2)/(1000)=24 gm`.
Discussion
9265.

Toluence on heating with succine anyhydride in the presence of anhyd.AICI_(3) followed by reduction with Zn(Hg) | Conc. HCI gives a product which on heating with thionyl chloride followed by heating with anyd. AICI_(3) in CS_(2) gives dominantly the ultimate product (P).Hence the ultimate product () is :

Answer»

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SOLUTION :
Discussion
9266.

What happens when (i)(NH_(4))_(2)Cr_(2)O_(7)is heated ? (ii) H_(3)PO_(3)is heated ?

Answer»

Solution :(ii) `4H_(3)PO_(3)overset(473K) (rarr) 3H_(3)PO_(4)+ PH_(3) `
Discussion
9267.

The weight of substance that displaces 22.4 litre air at NTP is :

Answer»

Mol.wt.
At.wt.
eq.wt.
All

Answer :A
Discussion
9268.

Which group is present in both aldehydes and ketones ?

Answer»

SOLUTION :CARBOXYL GROUP
Discussion
9269.

Which of the following will not react with NaOH?

Answer»


`C_(2)H_(5)OH`
`CH_(3)CONH_(2)`
`CH(CN)_(3)`

SOLUTION :`C_(2)H_(5)OH` (ethanol) is a very weak ACID, hence it does not reacts with NaOH. However it react with METALLIC sodium.
Discussion
9270.

The standard reduction potential of the electrodeOH^(-)|H_2(Pt) (1 atm) is E^@ = 0.828 volt. Calculate K_(w)at 298 K if Nernst equation takes the formE = E_(H_2O,OH^- )^@ =- 0.059 log [OH^-]

Answer»

SOLUTION :`1.03 XX 10^(-14)`
Discussion
9271.

Zinc rod is dipped in 0.1 M solution of ZnSO_4. The salt is 95% dissociated at this dilution at 298 K. Calculate the electrode potential. [Given, E_(Zn^(2+)//Zn)^(@) = -0.76 V]

Answer»

Solution :Applying Nernst Equation
`E_(Zn^(2+)//Zn) = E_(Zn^(2+)//Zn)^(@) -0.0591/2 LOG 1/([Zn^(2+)])`
`[Zn^(2+)] =0.1 XX 95/100= 0.095 M`
`Zn^(2+) + 2e^(-) to Zn` or n=2
`E_(Zn^(2+)//Zn) = -0.76 V- 0.0591/2 [log1000- log 95]=-0.76 V -(0.0591)/2 [ 3.000 - 1.9777]`
`=-0.76 V - (0.0591)/2 xx 1.0223 = -0.76 V - 0.00604/2`
`=-0.76 V - 0.0302 = -0.7902` V
Electrode potential `=-0.7902` V
Discussion
9272.

The vapour pressure of a 0.01 molal solution of a weak monobasic acid in wateris 17.536 mm at 25^@C . Calculate the degree of dissociation of the acid. Aqueous tension of water at 25^@Cis 17.54 mm

Answer»


ANSWER :0.266
Discussion
9273.

Which of the following halogens does not exhibitpositive oxidation state in its compounds?

Answer»

Cl
Br
I
F

Solution :FLUORINE is most ELECTRONEGATIVE element, THUS it will never LOSE electron to form positive ions.
Discussion
9274.

Which element is the best metalloid?

Answer»

SOLUTION :GERMANIUM
Discussion
9275.

Which of the following is not an adsorbent ?

Answer»

Silica gel 
ALCIUM chloride
Precipitate of silver HALIDE 
CLAY 

Answer :B
Discussion
9276.

What is the nature of the solution when ethyl alcohol and water are mixed ?

Answer»

SOLUTION :The solution SHOWS POSITIVE DEVIATION from Raoult.s LAW.
Discussion
9277.

Which of the following combination of species undergo(es) comproportionation?

Answer»

`MnO_(4)^(-)(aq.)+MN^(2+)(aq.)overset(ZnO//ZnSO_(4))to`
`S+conc.underset((excess))(H_(2)SO_(4)) overset(WARM)to`
`PH_(3)+H_(3)PO_(4) to`
`NO(g)+NO_(2)(g) overset("cool")to`

ANSWER :A::D
Discussion
9278.

Using the valence bond approach, deduce the shape and magnetic character of [Co(NH_(3))_(6)]^(3+). [Atomic number of Co = 27]

Answer»

Solution :Electronic configuration of Co : [AR) `4s^(2) 3d^(7)`. Electronic configuration of Co3+ : [Ar) `4s^(0) 3d^(6)`.
`NH_(3)` is a STRONG field ligand, it will cause pairing of electrons. Hence,

It has OCTAHEDRAL shape and is diamagnetic due to the ABSENCE of unpaired electrons.
Discussion
9279.

Which of the following expressions correctly represents the relationship between the average molar kinetic energy , bar(K.E.), of CO and N_(2) molecules at the same temperature

Answer»

`bar(KE)_(CO)=bar(KE)_(N_(2)`
`bar(KE)_(CO) gt bar(KE)_(N_(2)`
`bar(KE)_(CO) LT bar(KE)_(N_(2)`
Cannot be predicted unless the volumes of the GASES are given

Solution :For same temp. kinetic energies would be equal for all MOLECULES, what every their molecular WEIGHTS will be, it doesn't matter
Discussion
9280.

Which pair gives Cl_(2) at room temperature

Answer»

`HCl_("CONC." )+KMnO_(4)`
`NaCl+H_(2)SO_(4"conc.")`
`NaCl+MnO_(2)`
`NaCl+HNO_(3conc.)`

Solution :`2KMnO_(4)+16HCl RARR 2KCl+2MnCl_(2)+8H_(2)O+3Cl_(2)`
Discussion
9281.

What is the effect of denturation on the structure of protenis ?

Answer»

Solution :During denaturation , `2^@ and 3^@` STRUCTURES of proteins are destroyed but `1^@` structure remains intact As a result of denaturation , the globular proteins (soluble in `H_2O`) are converted into fibrous process (INSOLUBLE in `H_2O`) and their biological activity is lost. For example , boiled egg which contains coagulation proteins cannot be HATCHED to produce CHICKENS.
Discussion
9282.

Which nitrogen base is not present in DNA ?

Answer»

ADENINE
GUANINE
CYTOSINE
URACIL

Solution :Uracil
Discussion
9283.

Write the equations for the rate determining step Involved in the mechanism of the hydrolysis of tert, butyl bromide.

Answer»

Solution :`S_(N)^(1)` Mechanism: This is a first order Uni-molecular reaction which completes in two STEPS:
`(H_(3)C)_(3)C-Br +OH_(1) rightarrow (CH_(3))_(3)C-OH+Br ^(-)`
The rate law in Rate `= K [(CH_(3))_(3) C Br]`
Step `1 - (CH_(3))_(3) Leftrightarrow (CH_(3))_(3)C^(+)+Br^(-)` (Slow step)
(TERT. butyl BROMIDE)
Step `2 - (CH_(3))_(3) C^(+) + OH^(-)rightarrow (CH_(3))_(3) C-OH`
(tert. butyl alcohol) (fast step)
Discussion
9284.

The reagent used for the preparation of higher ether from halogenated ethers is

Answer»

Conc. `H_(2)SO_(4)`
Sodium alkoxide
Dry silver oxide
Grignard reagent

Solution :`underset("(Lowerether)")underset("Methoxymethane")(CH_(3)OCH_(3))overset(Cl_(2)//hv)to underset(ALPHA-"mono Chlorodimethylether")(CH_(3)OCH_(2)CL)underset(-MgBr(Cl))overset(CH_(3)MgBr)to underset("(Higher ether)")underset("Methoxygethane")(CH_(3)OCH_(2)CH_(3))`
Discussion
9285.

Which statement is true from the following ?

Answer»

Drugs bind to receptor site instead of MESSENGERS and stop communication process of cell are called agonists.
The RECEPTORS which accept drugs in impression of natural messenger and communication process occurs are calledantagonists.
Drugs bind to DIFFERENT SITES instead of active site of enzyme, this site is called ALLOSTERIC site.
Drug helped in binding of substrate with active site of enzyme are called enzyme inhibitors. 

Solution :Drugs bind to different sites instead of active site of enzyme, this site is called allosteric site.
Some drugs do not bind to the active site of enzyme but bind to a different site. This siteis called allosteric site.
Discussion
9286.

Which of the following carbonyl compound will give two products after reaction with NH_(2)OH:

Answer»


Answer :5 (i, ii, IV, V, VI)
Discussion
9287.

Which of the following graphs is correct for a first order reaction ?

Answer»




Solution :(a) is correct because `t_(1//2)` of a 1st order REACTION is INDEPENDENT of initial CONCENTRATION. (b) and ( c ) are wrong. (d) is correct
Discussion
9288.

Which reagent will bring about the convesion of carboxylic acids into esters?

Answer»

`C_2H_5OH`
` DRY HCl//C_2 H_5OH`
` LiAIH_4`
`AL(OC_2H_5)_3`

ANSWER :B
Discussion
9289.

When little vanadium is mixed with steel, it becomes

Answer»

More hard
More tensility
Both (a) and (B)
No effect

Answer :C
Discussion
9290.

The vapour density of compeletly disssociated NH_4Cl would be :

Answer»

Slightly LESS than half of that of ammonium chloride
Half of that of ammonium chloride
Double that of ammonium chloride
Determined by the AMOUNT of solid ammonium choride USED in the experiment

Answer :B
Discussion
9291.

Which of the following molecules contain a chiral centre?

Answer»

2-chloropropan-2-ol
1-chlorobutane
2-chloropropane
2-chlorobutane

Answer :D
Discussion
9292.

Which of the following glass is used in making wind screen of automobiles

Answer»

Crook's
Jena
Safety
Pyrex

Answer :C
Discussion
9293.

What do you mean by tailing of mercury ?

Answer»

SOLUTION :When mercury is combined with `O_3`, it LOSSES its meniscus and starts sticking to GLASS surface known as TAILING.
Discussion
9294.

What happes to mostprobableto theabsolute temperatur and theenergyofactivationwith increase in temperature ?

Answer»


Solution :Kineticenergyis directlyproporitanl to thetemperature and thenumbermolecules possessing higher energies increase withincrease in temperature, i.e,probablekinetic ENERGY INCREASES with increase intemperature.
Energy of ACTIVATIONIS related to temperature by the followingArrhenius EQUATION
`k = Ae^(-E_(a) //RT)`
Thus, it also shown an increase with rise in temperature .
Discussion
9295.

Which is paramagnetic ?

Answer»

`[NI(H_(2)O)_(6)]^(2+)`
`[FE(CN)_(6)]^(4-)`
`[Ni(CO)_(4)]`
`[Ni(CN)_(4)]^(2-)`.

ANSWER :A
Discussion
9296.

Which of the following best describes the stability of the cis and trans isomers of 1, 1, 3, 5 tetraethylcyclohexan ?

Answer»

The TRANS isomer is more stable than the cis.
The cis isomer is more stable than the trans.
Both have the same STABILITY
The information GIVEN is not sufficient to deduce the stability of the isomers.

Answer :B
Discussion
9297.

Which statement about group 12 elements is wrong ?

Answer»

Zinc forms an ALLOY with copper
`Zn_2^(2+)` is stable
Mercury gives compounds with +1 and +2 Valencies
Hg is aliquid ELEMENT

ANSWER :B
Discussion
9298.

White phosphorus may be separated from red phosphorus by:

Answer»

Sublimation
Distillation
Dissolving in `CS_2`
NONE of these

Answer :C
Discussion
9299.

Which one of the following is formed when phenol is treated with chloroform and sodium hydroxide.

Answer»

CHLOROBENZENE
SALICYLALDEHYDE
SALICYLIC acid
Aniline

SOLUTION :Salicylaldehyde
Discussion
9300.

Transition elements are coloured due to:

Answer»

SMALL size
Metallic nature
Unpaired d-electrons
None

Answer :C
Discussion