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6901.

What is first order reaction?Determine the integrated rate equation for first order reaction RtoP

Answer»

<P>

Solution :First order reaction :The rate of the reaction is proportional to the first power of the cocentration of the reactant R is called first order reaction .
The rate of first order reaction.
The rate of first order reaction `prop[R]^(1)`
Where ,reaction R `to` P is first order reaction.
The differential rate expression of first order reaction is as under
Rate =`-(d[R])/(dt)=k[R]` ..........(i)
`therefore(d[R])/([R])=-k dt`.......(ii)
Intergrating this equation both side ,
In [R] =-kt+1 .......(iii)
Here,I=Constant of integration
When ,t= [R]=`[R]_(0)` .Where `[R]_(0)` is the initial concentration of the reactant.Put this value in eq. (iii)
In `[R]_(0)=-kxx(0)+1`
`therefore In [R]_(0)=I` .......(iv)
If we put I =In `[R]_(0)` in equation (iii),we get
In [R]=-kt+In `[R]_(0)`......(VA)
`therefore` kt =In `[R]_(0)`-In [R]
`therefore kt=In ([R]_(0))/([R])`
`therefore k=(1)/(t)xxIn ([R]_(0))/([R])` .......(VB)
Equation V(A) and V(B) both are integrated rate equation (VA) and (VB) can written in the form
log [R]=`-(kt)/(2.303)+log [R]_(0)` ......(ViA)
`K=(2.303)/(t)` log `([R]_(0))/([R])` .....(VIB)
Note:Equation VA and VIA are stright equations .So,if we plot in `[R]tot` and log [R]`to` t we get a straight LINE with slope=-k and intercept equal to In `[R]_(0)` and log `[R]_(0)`
Taking ANTILOG of equation (VA) at both ide ,we get [R]=`[R]_(0)E^(-kt)` .........(vii)
Discussion
6902.

Which of the following plot correctly represents the variation of a concentration of a surfactant (e.g., sodium dodecyl sulphate) versus molar conductivity with regard to behavior art CMC

Answer»




Solution :The molar CONDUCTIVITY veries as shown in plot (a). With INCREASE in concentration below CMC, molar conductivity keeps on decreasing. After CMC, the decrease becomes steeper and a DISCONTIUNITY is observed at CMC.
Discussion
6903.

Which is a condensation Polymer ?

Answer»

PVC
Teflon
Bakelite
None of these

Answer :C
Discussion
6904.

What is meant by the term coordination number in solids? What is the coordination number in a face centered cubic close packing structure?

Answer»

Solution :The no.of ligands or doriar atoms to which the metal is DIRECTLY BONDED to it. In an ionic crystal, the number of oppositely charged ions SURROUNDING a ION under consideration 12.
Discussion
6905.

Which gas should not be collected over water because of its high solubility in water ?

Answer»

`H_(2)`
`N_(2)`
`CH_(4)`
`HCL`

Solution :HCl is highly SOLUBLE in water because it ionise in water and form ion-dipole INTERACTION with water.
Discussion
6906.

What are primary and secondary valency of cobalt in CoCl_(3).6NH_(3) ?

Answer»

`3,3`
`6,3`
`3,6`
`6,6`

ANSWER :C
Discussion
6907.

Thermal decomposition of a compound is of first order. If 50% of the compound is decomposed in 120 minute, how much time it take for the 90% decomposition of the compound ?

Answer»

Solution :`K = (2.303)/(t) LOG.(a)/(a-x)`
`K = (0.693)/(t_(½))`
`K = (0.693)/(120) = 5.775 xx 10^(-3) min^(-1)`
`t = (2.303)/(5.775 xx 10^(-3)) log.(100)/(10)`
`t = 398.78 min` or `t = 23,9625`
Discussion
6908.

Which of the following reactions can be used for the synthesis of an alkene

Answer»

Chugaev REACTION
Dakin reaction
Reimer-Tiemann reaction
Wurtz-Fittig reaction

Solution :Chugaev reaction can be USED for the SYNTHESIS of an ALKENE
Discussion
6909.

The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K. If the value of A is 4xx10^(10)s^(-1), calculate k at 318 K and E_(a).

Answer»

Solution :`k_(298"K")=(2.303)/(t_(1))LOG""(a)/(a-0.10a)=(2.303)/(t_(1))log""(10)/(9)=(2.303)/(t_(1))(0.0458)=(0.1055)/(t_(1))" or "t_(1)=(0.1055)/(k_(298"K"))`
`k_(308"K")=(2.303)/(t_(2))log""(a)/(a-0.25a)=(2.303)/(t_(2))log""(4)/(3)=(2.303)/(t_(2))(0.125)=(0.2879)/(t_(2))" or "t_(2)=(0.2879)/(k_(308"K"))`
But `t_(1)=t_(2)." Hence, "(0.1055)/(k_(298"K"))=(0.2879)/(k_(308"K"))" or "(k_(308"K"))/(k_(298"K"))=2.7289`
Now, applying Arrhenius equation, `log""(k_(308"K"))/(k_(298"K"))=(E_(a))/(2.303"R")((T_(2)-T_(1))/(T_(1)T_(2)))`
`:.log(2.7289)=(E_(a))/(2.303xx8.314" JK"^(-1)" mol"^(-1))xx((308-298)K)/(298" K"xx308" K")`
`0.4360=(E_(a))/(2.303xx8.314)xx(10)/(298xx308)" or "E_(a)=76.623" kJ mol"^(-1).`
CALCULATION of k at 318 K
`log k=logA-(E_(a))/(2.303"RT")=log(4xx10^(10))-(7623" JK"^(-1)" mol"^(-1))/(2.303xx8.3174" JK"^(-1)"mol"^(-1)xx318" K")`
`=10.6021-12.5843=-1.9822`
or `k=" Antilog "(-1.9822)=" Antilog "(bar(2).0178)=1.042xx10^(-2)s^(-1).`
Discussion
6910.

Which of the following is not correct for enzyme catalysis?

Answer»

The enzyme ACTIVITY is maximum at optimum pH which is between 5-7.
Each enzyme is specific for a GIVEN reaction.
The favourable temperature range of enzyme activity is between`50-60^@C`.
The enzymatic activity is INCREASED in presence of CERTAIN substances called co-enzymes

Answer :C
Discussion
6911.

What will be the conjugate bases for the Bronsted acids? HF,H_2SO_4 and H_2CO_3?

Answer»

SOLUTION :CONJUGATE BASES: `F^(-),HSO_4^(-),HCO_3^-`
Discussion
6912.

Which among the following statements are true for the complex [Co(NH_(3))_(6)][Cr(CN)_(6)] (i) It is a non-electrolyte (2) The magnitude of the charge on each complex ion is 3 (3) The complexwill not conduct currect (4) The complex will exhibitcoordination isomerism (5) The magnitude of the charge on each complex ion is 1

Answer»

1 and 4
1 and 2
1 and 3
2 and 4

Answer :D
Discussion
6913.

Which of the following is correct graph between Probability density spi_((r))^(2) vs radial distance of electron (r) form nucleus for 3 s ?

Answer»




SOLUTION :HEIGHT of MAXIMA decreases in radial probability DENSITY curve.
Discussion
6914.

Which of the following compounds react with sodium bicarbonate ?

Answer»

Phenol
Ethnol
ACETYLENE
Picric acid

Solution :ACIDIC NATURE
picric acid > carbon acid > phenol > ethanol > acetylene
Discussion
6915.

Which type of aldehydes undergo aldol condensation. Give an example.

Answer»

Solution :Aldehydes or ketones that contain one or more a-hydrogen atoms UNDERGO ALDOL condensation.
(i) Acetaldehyde - `CH_(3)CHO`
 (ii) ACETONE - `CH_(3)COCH_(3)`
Discussion
6916.

The resistance and resistivity of a conductor is given by

Answer»

`RHO = Rl/A`
`R = rhoA/L`
`R =rho l/A`
`rho =A A/l^(2)`

ANSWER :C
Discussion
6917.

The values of dipole moment are same for-

Answer»




ANSWER :A::D
Discussion
6918.

Which statement are corrrect in the case of acetaldehyde and acetone?

Answer»

Both react with `NaHSO_(4)`
Both give IODOFORM test
Both can be REDUCED into ALCOHOLS
Both undergo aldol condesation

Answer :A::B::C::D
Discussion
6919.

The species with spin only magnetic moment of sqrt(24) BM is:

Answer»

`[CoF_(3)(H_(2)O)_(3)]`
`[CoCl_(4)]^(2-)`
`[NiCl_(4)]^(2-)`
`[Ni(H_(2)O)_(6)]^(2+)`

ANSWER :A
Discussion
6920.

Which of the followign is (are) true for first order reaction?

Answer»

Rate of reaction is fastest at the beginning of the reaction.
Rate of reaction is fastest when [reactants]=[PRODUCTS]
Rate of reaction increases with temperature usually.
rate of EXOTHERMIC reaction decreases with increase in temperature.

Solution :Rate only DEPENDS CON. Of reactants temp, pressure, catalyst.
Discussion
6921.

Which one of the following is incorrect for ideal solution

Answer»

`DeltaG_(mix)=0`
`DeltaH_(mix)=0`
`DeltaU_(mix)=0`
`DeltaP=P_(OBS)-P_("calculated by Raoult's law")=0`

Solution :For ideal solution inter molecular forces are identical so,
`DeltaH_("mix")^(@)=0,DeltaV_("mix")=0,DeltaG_("mix")lt0`
So 1 ST option is incorrect.
Discussion
6922.

Using the data (all values are in kcal per mole at 25^(@)C ) given below, calculate the bond energy of C-C and C-H bonds. DeltaH_("combustion")^(0)("ethane")=-372 DeltaH_("combustion")^(0)("propane")=-530 DeltaH^(0)"for" C ("graphite") to C(g)=172 Bond energy of H-H=104 DeltaH_(f)^(0)ofH_(2)O(l)=-68 DeltaH_(f)^(0)of CO_(2)(g)=-94

Answer»

SOLUTION :The following are the given thermochemical reactions:
(i) `C_(2)H_(6)(g)+3(1)/(2)O_(2)(g) to 2CO_(2)(g)+3H_(2)O(L),DeltaH^(0)=-372`
(ii) `C_(3)H_(8)(g)+5O_(2)(g) to 3CO_(2)(g)+4H_(2)O(l), DeltaH^(0)=-530`
(iii) `H_(2)(g)+(1)/(2)O_(2)(g) to H_(2)O(l), DeltaH^(0)=-68`
(iv) `C(s)+O_(2)(g) to CO_(2)(g), DeltaH^(0)=-94`
Let us first calculate the heat of formation of `C_(2)H_(6)` and `C_(3)H_(8)` from which we shall calculate the bond energy of C-C and C-H bonds.
`2C(s)+3H_(2)(g) to C_(2)H_(6)(g), DeltaH^(0)=?`
and `3C(s)+4H_(2)(g) to C_(3)H_(8)(g), DeltaH^(0)=?`
Appling the enspection method, i.e.,
[- Eqn. (i)+3xxEqn. (iii) +3xxEqn. (iv)], we get,
`3C(s)+4H_(2)(g) to C_(3)H_(8)(g), DeltaH^(0)=-24`
`[DeltaH^(0)=-(-530)+4(-68)+3(-94)=-24]`
Calculation of bond energy:
Now we have,
`2C(s)+3H_(2)(g) to C_(2)H_(6)(g), DeltaH^(0)=-20`
For reactants :
Heat of atomisation of 2 moles of C atoms `=2xx172`
Heat of dissociation of 3 moles of H-H bonds `=3xx104`
For products :
Heat of formation of 1 mole of C-C bonds `=x("say")`
Heat of formation of 6 moles of C-H bonds `=6y("say")`
On adding, we get `DeltaH^(0)` of formation of `C_(2)H_(6)` .
`2xx172+3xx104+x+6y=-20`
or `x+6y=-676` ....(1)
Again, we have,
`3C(s)+4H_(2)(g) to C_(3)H_(8)(g),DeltaH^(0)=-24`
For reactants :
Heat of atomisation of 3 moles of C atoms `=3xx172`
Heat of dissociation of 4 moles of H-H bonds `=4xx104`
For products :
Heat of formation of 2 moles of C-C bonds `=2x`
Heat of formation of 8 moles of C-H bonds `=8y`
On adding, we get,
`3xx172+4xx104+2x+8y=-24`
or `2x+8y=-956` ....(2)
From eqns. (1) and (2), we get, `x=-82` and `y=-99`
`:. C-C bond energy =82 "kcal"`
`C-H bond energy `=99 "kcal"`
Discussion
6923.

Which has the same electronic configuration as of inert gas:

Answer»

`AG^(3+)`
`CU^(2+)`
`PB^(4+)`
`Ti^(4+)`

ANSWER :D
Discussion
6924.

What do we obtain when we treat aniline with bromine water ?

Answer»


ANSWER :2, 4, 6-tribromoaniline
Discussion
6925.

Which of the following is correct for the complex [NiBr_(2)(PPH_(3))_(2)] ?

Answer»

It is SQUARE planar with ONE unpaired electron.
It is TETRAHEDRAL with two unpaired electrons.
It is square planar and diamagnetic.
It is tetrahedral with one unpaired electron.

Solution :
Discussion
6926.

Which is leaving group in the hydrolysis of CH_(3)COOC_(2)H_(5) ?

Answer»

`C_(2)H_(5)^(+)`
`C_(2)H_(5)O^(-)`
`CH_(3)COO^(-)`
`CH_(3)^(-)`

Answer :B
Discussion
6927.

Write the formula of copper amine complex cation.

Answer»

SOLUTION :`[CU(NH_3)_4]^(2+)`
Discussion
6928.

Which one is the most acidic compound?

Answer»




ANSWER :D
Discussion
6929.

(W) 4H_(3)PO_(4)overset(-3H_(2)O)rarr Compound 'X' How may P-O-P linkage are present in compound 'X' ? (x) How many following compound shows H-bonding? H_(3),BO_(3),HF,CiF_(3),H_(2)S,HCl, chlora, H_(2)O_(2) (y) How many following compound exist in solid form in nature? Br_(2),I_(2),H_(3)S,SiO_(2), Carborundom, Mercury, Black phosphorous (z) How many following compounds has/have +5 oxidation state? Phosphoric acid, Sulphuric acid, Dithionic acid, Pyrosulphurous acid, Pyrophosphroic acid, Hypochlorous acid. [If w=1,x=2,y=4,z=3, write your answer as 1243 in OMR sheet]

Answer»

Solution :(W)
TOTAL P-O-P linkage are=3
(x) `H_(3)BO_(3),HF` and `H_(2)O_(2)` shows H-bonding
(y) `Br_(2)`, Mercury-liquuid
`H_(2)S`, =gas
`I_(2),H_(3)BO_(3),SiO_(2)`, Carbourundom, Balck phosphorous-solid
(z) Phosporic acid.

Discussion
6930.

Which plastic is obtained from CHCl_(3) as follows . CHCl_(3)underset(SbF_(3))overset(HF)rarrXoverset(800^(@)C)rarrYoverset("polymerisation")rarr Plas tic .

Answer»

Bakelite
Teflon
Polythene
Perspex

Solution :`2CHCl_(2) underset(SbF_(3))overset(HF)to2CHF_(2)Cl underset(-2" "HCL)overset(800^(@)C)toCF_(2)=CF_(2) overset("POLYMERISATION")to(-CF_(2)-CF_(2)-)_(n)`
Discussion
6931.

Which adsorbents are used for removing moisture and controlling humidity ?

Answer»

Silica
Aluminium GEL 
(A) and (B) both
None of above 

SOLUTION :(C) (A) and (B) both
Discussion
6932.

Which among the following is a tertiary nitro compound?

Answer»



`CH_3CH_2CH_2-NO_2`

ANSWER :A
Discussion
6933.

Which of the followig reagents are used for the detection of acetate and oxalate ions respectively?

Answer»

`BaCl_(2) and CaCl_(2)`
`NaOH and BaCl_(2)`
`FeCl_(3) and CaCl_(2)`
`FeCl_(3) and NaOH`

ANSWER :C
Discussion
6934.

Which of the following is used widely in the manufacture of lead storage battery

Answer»

Arsenic
Lithium
Bismuth
Antimony

Answer :D
Discussion
6935.

Vapour pressure of a solution of 5g of non-electrolyte in 100g of water at a particular temperature is 2985 N//m^(2). The vapour pressure of pure water is 3000N//m^(2). The molecular weight of the solute is

Answer»

<P>60
120
180
380

Solution :`(P^(@)-P_(s))/(P^(@))=((W_(2))/(M_(2)))/((W_(1))/(M_(1)))=(300-2985)/(3000)=((5)/(M_(2)))/((100)/(18))` or `M_(2)=180`
Discussion
6936.

What is the product obtained when C_(6)H_(5)CH_(2)NH_(2) reacts with HNO_(2)?

Answer»


Answer :The product OBTAINED is `C_(6)H_(5)CH_(2)OH`.
Discussion
6937.

The total number of alpha and beta particles emitted in the nuclear reaction ._(92)^(238)U rarr ._(82)^(214)Pb is

Answer»


Solution :`._(92)^(238)U rarr ._(82)^(214)Pb + 6(._(2)^(4)He) + 2 (._(-1)E^(0))`
`alpha = 6, beta = 2`
Total = 8
Discussion
6938.

Which one of the following corresponds to a photon of highest energy?

Answer»

`lamda=300nm``v=3xx10^(8)s^(-1)`
`barv=30cm^(-1)`

SOLUTION :(a)`lamda=300nm=300xx10^(-9)m`
`E=(hc)/(lamda)=(6.626xx10^(-34)xx3xx10^(8))/(300xx10^(-9))`
`=6.626xx10^(-19)J`
(b) `v = 3 xx 10^(8) s^(-1)`
`E = hv = 6.626 xx 10^(-34) xx 3 xx 10^(8) = 1.9878 xx 10^(-25)` J
(c ) `barv=30cm^(-1)=30xx10^(2)m^(-1)`
`E=hcbarv=6.626xx10^(-34)xx3xx10^(8)xx30xx10^(2)`
`=5.9634xx10^(-22)J`
(d) `E=6.626xx10^(-27)J`
Discussion
6939.

Which of the followingis notprecipitate by H_(2)S inpresence of NH_(3)

Answer»

`CO^(2+)`
`Mn^(2+)`
`FE^(3+)`
`Cd^(2+)`

Answer :d
Discussion
6940.

XeF_2 on hydrolysis yeild..........

Answer»

`XeOF_(2)`
`XeO_(3)`
`XeO_(2)F_(2)`
Xe

Solution :`2XeF_(2) + 2H_(2)O to 2Xe +4HF + O_(2)`
Discussion
6941.

What are the uses of potassium dichromate?

Answer»

Solution :`K_(2)Cr_(2)O_(7)` is used
(i) as a strong oxidising agent
(ii) in dyeing and printing
(III) in leather tanneries for chrome plating
(iv) in QUANTITATIVE analysis for the estimation of IRON COMPOUNDS and iodides
Discussion
6942.

Which among the following on dehalogenation will give trans alkene:

Answer»

`{:("BR"),("|"),(H_(3)C-C-H),("|"),(H_(3)C-C-H),("|"),("Br"):}`
`{:("Br"),("|"),(H_(3)C-C-H),("|"),(H-"C"-CH_(3)),("|"),("Br"):}`
`{:("Br"),("|"),(H_(3)C-C-CH_(3)),("|"),(H_(3)C-C-CH_(3)),("|"),("Br"):}`
`{:("Cl"),("|"),(H_(3)C-C-CH_(3)),("|"),(H_(3)C-C-CH_(3)),("|"),("L"):}`

Answer :A
Discussion
6943.

Which of the following ions, will have maximum hydration energy

Answer»

`SR^(2+)`
`BA^(2+)`
`CA^(2+)`
`MG^(2+)`

Solution :HYDRATION energy of smaller cations are higher than those of larger cations. Hence `Mg^(+2)` has maximum hydration energy among these.
Discussion
6944.

Which of the following is a use of alum

Answer»

Making EXPLOSIVES
BLEACHING clothes
Water SOFTENING
all of the above

Solution :ALUM is USED for softening of water.
Discussion
6945.

Which of the following are most reactive compounds for nucleophilic acyl substitution?

Answer»




ANSWER :D
Discussion
6946.

Transition elements are d- block elements Write any four characteristic properties of transition elements.

Answer»

Solution :TRANSITION ELEMENTS show variable OXIDATION states. They FORM complexes or coordination compounds. Many of the transition metals and their compounds show catalytic activity. They GENERALLY form coloured compounds.
Discussion
6947.

Which of the following oxide is known as mixed anhydride ?

Answer»

`SO_(2)`
`NO_(2)`
`N_(2)O_(3)`
`N_(2)O_(5)`

SOLUTION :`2NO_(2) + H_(2)O to HNO_(3) + HNO_(2)`
Discussion
6948.

Which Is a tribasic acid :

Answer»

Malonic acid
Citric acid
Valeric acid
Tartaric acid

Answer :B
Discussion
6949.

What will be the total number of possible isomers of the compound: [Cu^(II)(NH_(3))_(4)](Pt^(II)Cl_(4)]

Answer»


ANSWER :4
Discussion
6950.

Write the structure of the major organic product in each of the following reactions :CH_(3)CH=C(CH_(3))_(2)+HBr rarr

Answer»

SOLUTION :`CH_(3)-CH_(2)-OVERSET("Br ")overset("| ")underset(CH_(3))underset("|")("C ")-CH_(3)`
Discussion