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251.

Which increases on increase of temperature

Answer»

Energy of ACTIVATION ` (E_(a))`
Collision frequency (Z)
Rate constant (k)
Both (B) and ( c)

Solution :The collisions frequency (Z) and rate constant (k) increase on increase of temperature . With the increase in temperature , the average kinetic energy of the molecules increases and this leads to an increase in number of collisions per UNIT time (Z). The rate constant (k) of a REACTION is also increases with increase of temperature .
Discussion
252.

Which of the following is correct for

Answer»

`CH_(3)-COClgtCH_(3)-COOCO-CH_(3)gtCH_(3)-COC_(2)H_(5)gtCH_(3)-CONH_(2)`
(reactivity towards cyanohydrin FORMATION)
`C_(6)H_(5)-CH=OgtCH_(3)-CH=OgtCH_(3)-CO-CH_(3)`
(reactivity towards cyanohydrin formation)

(reactivity towards electrophilic substitution reaction)
`CH_(3)-CH_(2)-CH_(2)CH_(2)-OHgtH_(3)C-CH_(2)-overset(OH)overset(|)(CH)-CH_(3)gt(CH_(3))_(3)C-OH`
(reactivity towards Lucar reagent)

Answer :A
Discussion
253.

The volume of a colloidal particle, V_(c) as compared to the volume of a solute particle in a true solution, V_(s), could be

Answer»

`(V_(c))/(V_(s))~~1`
`(V_(c))/(V_(s))~~10^(23)`
`(V_(c))/(V_(s))~~10^(-3)`
`(V_(c))/(V_(s))~~10^(3)`

Solution :For TRUE solutions, the DIAMETER RANGE of the PARTICLES is `1Å` to `10Å` and for colloidal particles, it is `10Å` to `1000Å`
`therefore(V_(c))/(V_(s))=((4//3)pir_(c)^(3))/((4//3)pir_(s)^(3))=((r_(C))/(r_(s)))^(3)=((10)/(1))^(3)=10^(3)`
Discussion
254.

The unit of resistivity is ……….. .

Answer»

`Omega m^(-1)`
`Omega m`
`m^(-1) OHM^(2)`
`Omega^(-1)m^(-1)`

ANSWER :B
Discussion
255.

Which one of the following rubber is used in the manufacture of chemical container andconveyer belts?

Answer»

Buna-N
NEO prene
Buna-S
poly isoprene

Solution : neo prene
Discussion
256.

Write the structure and IUPAC name of all the isomeric alcohols with molecular formula C_(5)H_(12)O

Answer»

Solution :(i) `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)-Ohto`Penta-1-ol
(ii) `CH_(3)CH_(2)-CH_(3)-underset(OH)underset(|)(CH)-CH_(3)to` Pentan-2-ol
(iii) `CH_(3)-CH_(2)-overset(OH)overset(|)(CH)-CH_(2)-CH_(3)to` Pentan-3-ol
(iv) `CH_(3)-underset(OH)underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(3)to` 3-Methalybutaj-2-ol
v. `CH_(3)-CH_(2)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)to`2-Methylbutan-2-ol
VI. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)OHto2,2`- DIMETHYL propan -1-ol
Discussion
257.

Unit of rate constant of a reaction is same as that of its rate. What is the order of this reaction?

Answer»

SOLUTION :ZERO ORDER
Discussion
258.

Which is not true about the coordination compound [Co(en)_(2)Cl_(2)]Cl?

Answer»

It exhibits geometrical isomerism
It exhibits optical isomerism
It exhibits ionization isomerism
it is an octahedral complex.

Solution :Ionization isomerism arises when the coordination compounds GIVE different ions in solution, this CONDITION is not SATISFIED with `[CO("en")_(2)Cl_(2)]CL`.
Discussion
259.

Write Nernst equation for the reaction : Zn(s)|Zn^(2+)(aq)||Cu^(2+)(aq)Cu(s)

Answer»

Solution :`E_(CELL)=E_(cell)^(@)-(0.0591)/(2)"LOG"([ZN^(2+)(aq)])/([CU^(2+)(aq)])`
Discussion
260.

Which of the following salt does not give any ppt with AgNO_(3) sol. :

Answer»

`F^(-)` salt <BR>`CL^(-)` salt
`Br^(-)` salt
`I^(-)` salt

SOLUTION :AgF - SOLUBLE in water
AgCl - white ppt, AgBr : light yellow ppt
AgI : dark yellow ppt
Discussion
261.

Which of the following does not impart colour to the flame ?

Answer»

LiCl
KCl
`MgCl_2`
`CaCl_2`

ANSWER :C
Discussion
262.

The reference electrode is made up of

Answer»

`Hg_(2)Cl_(2)`
`CuSO_(4)`
`HgCl_(2)`
`ZnCl_(2)`

ANSWER :C
Discussion
263.

Writer the IUPAC name of the following (i) CH_3CH=CHCH(CH_3)(Cl) (ii) CH_2=C(CH_3)CH(CH_3)(Cl) (iii) CH_3CH=C(CH_3)CH(CH_3)(Cl) (iv) CH_3CH=C(CH_3)CH_2Cl (v) CH_3CH=CHCH_2Cl (vi) CH_2=C(CH_3)CH_2Cl

Answer»

Solution :(i) 4 - Chloropent - 2 - ENE
(II) 3 - Chloro - 2 - methylbut - 1 - ene
(III) 4 - Chloro - 3 - methylpent - 2 - ene
(iv) 1 - Chloro - 2 - methylbut - 2 - ene
(v) 1 - Chlorobut - 2 - ene
(VI) 3 - Chloro - 2 - methylpropene
Discussion
264.

The slope and intercept respectively of the graph drawn between log(x)/(m) and logP in respect of the logarithmic form of Freundlich adsorption isotherm are

Answer»

`n, LOG(1)/(K)`
`(1)/(n), log K`
`LOGN, (1)/(K)`
`n, log K`

ANSWER :B
Discussion
265.

What are emulsions ? How are they classified ? State an application of emulsification.

Answer»

Solution :Emulsion: When a LIQUID is dispersed in another liquid, it is CALLED emulsion.
There are two types of emulsion :
(i) WATER in oil : When water is dispersed in oil, it is called water in oil emulsion. For example, butter.
(ii) Oil in water : When oil is dispersed in water, it is called oil in water emulsion. For example, MILK.
FATS are digested by emulsification with the help of bile juice
Discussion
266.

Which of the following statements is more correct?

Answer»

Catalyst only ACCELERATES the rate of a CHEMICAL reaction
A catalyst can RETARD the rate of chemical reaction
A catalyst can CONTROL the speed of a reaction
A catalyst alters the speed of a reaction

Answer :D
Discussion
267.

Which of the reactions can not be used to synthesize propyne ?

Answer»

`CH_(3)-CH=CH-Brunderset(t-ButOH)overset(t-ButO^(-)//Delta)rarr`
`CH-=CNa + CH_(3)-I rarr`
`HC-=CH+CH_(3)Nararr`
`CH_(3)-CHBrCHBrunderset((2)H^(+))overset((1)NaNH_(2)(EXCESS))rarr`

ANSWER :C
Discussion
268.

What is the action of mixture of NaNO_(2) and dil. HCl on : (a) Ethylamine, (b) Aniline (c ) Diehylamine How is nylon 6,6 prepared ? Whar are antacids'? Write any 'two' side effects of tranquilizers.

Answer»

Solution :(a)Action of `NaNO_(2)` and dil. HCl on ethyl amine :
`CH_(3)CH_(2)-NH_(2)+HONO overset(0*5^(@)C)to C_(2)H_(5)OH+N_(2)harr`
`"Ethyl amine"""+H_(2)O`
(b) Aniline : Benzene diazonium chloride is FORMED.

(c) Diethyl amine :

Nylon 6,6 : It is prepared by the condensation polymerisation of hexamethylenediamine with adipic acid under high pressure and at high temperature.
`nHO-underset("Adipic acid")overset(O)overset(||)C-(CH_(2))_(4)-overset(O)overset(||)C-OH+underset("Hexamethy lene diamine")(nH_(2)N-(CH_(2))_(6))-NH_(2)to`
`[-overset(O)overset(||)C-(CH_(2))_(4)-overset(O)overset(||)C-NH(CH_(2))_(6)-NH]_(n)+2nH_(2)O`
Two side effects of tranquilisers are :
1. DISORIENTATION and Confusion
2. Respiratory Distress or Arrest
Discussion
269.

When (NH_(4))_(2)Cr_(2)O_(7) is heated

Answer»

There is OXIDATION of N
There is REDUCTION of Cr
Net REACTION is disproportionation
Net reaction is neutralisation

Answer :A::B
Discussion
270.

Why are fluorine and oxygen compounds called oxygen fluorides?

Answer»

SOLUTION :The BINARY compounds of fluorine and oxygen are called fluorides of oxygen rather than OXIDES of fluorine because fluorine is more electronegative than oxygen. However, compounds of oxygen and other HALOGENS are called oxides because oxygen is more electronegative than other halogens.
Discussion
271.

Which of the following can be oxidised by acidified K_2Cr_2O_7 ?

Answer»

NITRATE ions
Sulphite ions
Ferric ions
Borate ions

Answer :B
Discussion
272.

Which of the two is more basic and why? CH_(3)NH_(2) or NH_(3).

Answer»

Solution :Due to `+I` effect of `-CH_(3)` group, electron DENSITY on N- ATOM increases, hence METHYL amine is STRONGER than ammonia.
Discussion
273.

Which of the following bonds require the largest amount of energy to dissociate the bond concerned ?

Answer»

H-H BOND in `H_2`
C-H bond in `CH_4`
N≡N bond in `N_2`
O=O bond in `O_2`

ANSWER :C
Discussion
274.

Which of the following factors is of no significance for roasting sulphide ore to the oxide and not subjecting sulphide ore to carbon reduction directly ?

Answer»

`CO_(2)` is more volatile than`CS_(2)`
Metal sulphides are thermodynamically more stable than `CS_(2)`
`CO_(2)` is thermodynamically more stable than `CS_(2)`
Metal sulphides are less stable than the CORRESPONDING oxides.

Solution :`CS_(2)` is more volatile than `CO_(2)`. THEREFORE this option is of no significance.
Discussion
275.

Which one of the following characteristics is associated with adsorption

Answer»

`DeltaG`is NEGATIVE but `DeltaH` and `DELTAS` are positive
`DeltaG, DeltaH` and `DeltaS` all are negative
`DeltaG` and `DeltaH` are negative but `DeltaS` is positive
`DeltaG` and `DeltaS` are negative but `DeltaH` is positive

Solution :ADSORPTION is spontaneous PROCESS, so `DeltaG` = negative
Adsorption is exothermic process, so `DeltaH` = negative
In adsorption ENTROPY decreases, so `DeltaS` = negative
so `DeltaG, DeltaH and DeltaS` all are negative
Discussion
276.

Write structure of different isomers corresponding to the molecular formula, C_(3)H_(9)N. Write IUPAC names of the isomers which will liberate nitrogen gas on treatment with nitrous acid.

Answer»

SOLUTION :In all FOUR STRUCTURAL ISOMERS are POSSIBLE. These are:
Discussion
277.

Which of the following is a foaming agent in froth flation process

Answer»

pine oil
amyl XANTHATE
`CuSO_(4)`
`KCN`

SOLUTION :Pine oil is used as a foaming agent in froth FLOATATION process.
Discussion
278.

The relation between pK_(b) and logK_(b) is given by

Answer»

`pK_(b)=logK_(b)`
`pK_(b)=LN K_(b)`
`pK_(b)=-LOG K_(b)`
`pK_(b)=-In K_(b)`

ANSWER :C
Discussion
279.

Who gave the law of independent migration of ions ?

Answer»

SOLUTION :KOHLRAUSCH
Discussion
280.

Which of the following can be oxidised by SO_2 ?

Answer»

`K_(2)Cr_(2)O_(7)`
Mg
`H_(2)O`
All of these

ANSWER :B
Discussion
281.

Which of the following reaction will not occur?

Answer»

`C_6H_5N_2^(+) + CuBr overset(HBR)to C_6H_5-Br`

`C_6H_5N_2^(+) UNDERSET(HOH)overset(H_3PO_2)to C_6H_5H`
`C_6H_5N_2^(+)+I^(-) to C_6H_5 - I`

Solution :`C_6H_5N_2^(+) + C_6H_5OH to C_6H_5N_2 C_6H_5OH` or
Here , REAGENT used is `C_6H_5N_2^+` instead of `C_6H_5N_2`.
Discussion
282.

Which of the following sequence ofT and F is correct for given statements. Here T stands for True statement and F stands for False statement. (i) Troposphere is the lowest region of atmosphere inwhich the human beings along with other organismslive.(ii) Troposphere extends up to the height of I 0 km fromsea level.(iii) Stratosphere lies above troposphere, between 10 and20 km above sea level.(iv) Troposphere contains much little water vapour,dinitrogen, dioxygen and ozone(v) Stratosphere contains ozone, and cloud formationalso takes place in this region.

Answer»

TTTTT
TFTFF
TTFFF
TFTFT

Solution :For statement (iii), Stratosphere lies above TROPOSPHERE between I 0 and 50 KM above sea level cloud formation takes place in troposphere. For statement (iv), Troposphere is a turbulent, DUSTY ZONE containing air, much water vapour and clouds. For statement (v), Sttatosphere contains dinitrogeu, dioxygen, ozone and little water vapour.
Discussion
283.

Which are the properties of sols?

Answer»

Adsorption
Tyndal effect
Flocculation
Paramagnetism

Answer :A::B::C
Discussion
284.

Which of the following after burning at room temperature gives gaseous oxide

Answer»

H
Na
S
He

SOLUTION :`S +O_(2) to SO_(2)`
Discussion
285.

What is transition stte?

Answer»

Solution :Transition state or activated complex : The configuration of atoms formed from reactant molecules and which is at the peak of barrier in energy PROFILE diagram having maximum potential energy compared to reactants and products is called transition state or activated complex.
`A-B +C rarr UNDERSET("Transition state")(A.........B........C) rarr A+B-C`
Discussion
286.

Which of the following is called Bayer's reagent

Answer»

Alk `KMnO_(4)`
Acidic `KMnO_(4)`
`K_(2)HgI_(4)`
RED `P//HF`

ANSWER :A
Discussion
287.

Which of the following has maximum number of unpaired electrons?

Answer»

<P>`CU^(2+)(Z=29)`
`Fe^(3+)(Z=26)`
`Fe(Z=26)`
`P(Z=15)`

Solution :`Cu^(2+),[Ar]3D^(9),`
`Fe^(3+):[Ar]3d^(5)` `P:[Ne]3s^(2)3p^(3)`
`Fe^(3+)`has maximum (five) unpaired electrons.
Discussion
288.

The van'tHoff reaction isotherm is:

Answer»

`triangleG=RT log_g K_p`
`-trinagleG=RT log_g K_p`
`triangleG=RT^2 in K_p`
NONE of these

Answer :B
Discussion
289.

the sing of DeltaG for the process of melting of ice at 273 K and 1 atm pressurme is

Answer»

POSITIVE
negaitive
neither negative nor positive
either negative or positive

Solution :At 273 K water and ice are in EQUILLIBRIUM , HENCE` DeltaG=0`
Discussion
290.

The vapour pressure of pure water at 25^(@)C is 23.62 mm. What will be the vapour pressure of a solution of 1.5 g of urea in 50 g of water ?

Answer»


Solution :According to Raoult's law,
`(P_(A)^(@)-P_(S))/P_(S)=x_(B)=n_(B)/n_(A)=(W_(B)//M_(B))/(W_(A)//M_(A))= `
`P_(A)^(@)=23.62 mm, W_(B)=1.5g, M_(B)=60"mol"^(-1),W_(A)=50 G,M_(A)=18" g mol"^(-1)`
`(23.62-P_(S))/P_(S)=((1.5g)//(60"g mol"^(-1)))/((50g)//(18" g mol"^(-1)))=0.009, 23.63 -P_(S)=0.009 P_(S)`
or `1.009 P_(S)=23.62 or P_(S)=(23.62)/(1.009)=23.41 mm.`
Discussion
291.

Write the Nernst equation for the half cell Zn^(2+)""_((aq))//Zn_((s)).

Answer»

SOLUTION :Solution :
`E=E^(@)-2.303(RT)/(2F)logZn^(2+)`
`E_(Zn^(2+)//Zn)=E^(@)"_(Zn^(2+)//Zn)-2.303(RT)/(2F)log[Zn^(2+)]`
Discussion
292.

What happens when (write reactions only). (i) Nitroprppane is treated with LiAlH_(4). (ii) Ethyl isocyanide undergoes hydrolysis. (iii) Benzene diazonium chloride reacts with phenol in basic medium.

Answer»

Solution :(i) `CH_(3)CH_(2)HC_(2)NO_(2)overset(LiAlH_(4))(to) CH_(3)CH_(2)CH_(2)NH_(2)+2H_(2)O`
(ii) `C_(2)H_(5)N+2H_(2)OtoC_(2)H_(5)NH_(2)+HCOOH`
Discussion
293.

Which one of the following is a synthetic rubber?

Answer»

NEOPRENE
cellulose
silk
poly isoprene

Solution :Neoprene
Discussion
294.

Which of the following element of nitrogen family produce maximum number of oxy-acids

Answer»

N
P
As
Sb

ANSWER :B
Discussion
295.

What are alums ?

Answer»

Solution :The NAME alum is given to the double salt of POTASSIUM aluminium sulphate.
`[K_(2)SO_(4).Al_(2)(SO_(4))_(3).24.H_(2)O]`
Discussion
296.

Which is best solvent

Answer»

`H - CHO`
`CH_(3)COCH_(3)`
`CH_(3) - CHO`
`CH_(3)COOH`

ANSWER :B
Discussion
297.

Which of the following oxidation state is common for all lanthanoids?

Answer»

`+2`
`+3`
`+4`
`+5`

SOLUTION :`(+3)` is most COMMON oxidation states for lanthanoids.
Discussion
298.

Which one of the following used as fuel in rockets?

Answer»

`LiqO_(2)`
`LiqCO_(2)`
`LiqN_(2)`
`LIQ He -O_(2)`

SOLUTION :`LiqO_(2)`
Discussion
299.

When 0.1 mole of glucose is dissolved in 10 mole of water, the vapour pressure of water is

Answer»

Increased by 1%
Increased by 10%
Decreased by 1%
Decreased by 10%

SOLUTION :ACCORDING to Raoult.s law,
`(p_(A)^(@)-p_(A))/(p_(A)^(@))=x_(B)`
or `(DELTAP)/(p_(A)^(@))=(n_(B))/(n_(A)+n_(B))`
`(Delta p)/(p_(A))=(0.1)/(10+0.1)~~(0.1)/(10)=(1)/(100)=1%`
Discussion
300.

Which characteristic of zero group elements is common :

Answer»

Each of them has the same ATOMIC number
Each of them has the same atomic mass
The outermost orbit of ELECTRON of each is saturated
Each of them has the same number of electrons

Solution :In zero group ELEMENTS for all elements same outermost ELECTRONIC configuration. `ns^2np^6`
Discussion