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16051.

When 400 ml of 2.0 N solution of a weak acid is neutralized by a dilute aqueous solution of sodium hydroxide under standard conditions, 4.4 kJ amount of heat is liberated. Therefore, the standard enthalpy of neutralization of this weak acid in kJ eq^(-1) is

Answer»

`-11`
`-44`
`-55`
`-22`

Solution :No. of EQUIVALENTS of weak acid `0.4xx0.2`=0.08
So, amount of heat liberated PER EQUIVALENT
`-(4.4)/(0.08)=-55 kJ`.
Discussion
16052.

What is Lucas reagent ?

Answer»

Solution :Lucas reagent is composed of a mixture of concentrated HCl and Lewis acid, ANHYDROUS `ZnCl_(2)`.
It is used to prepare alkyl chloride and to DISTINGUISH between `1^(@), 2^(@)` and `3^(@)` ALCOHOLS.
Discussion
16053.

Which among the following molecular formulae represents urotropine ?

Answer»

`C_(6)H_(12)N_(4)`
`C_(6)H_(24)N`
`C_(6)H_(12)N_(4)O_(2)`
`C_(6)H_(24)N_(4)O_(2)`

SOLUTION :The MOLECULAR formulae of urotrophine is `C_(6)H_(12)N_(4)`
It is also called as HEXAMETHYLENE tetramine .
Discussion
16054.

Which of the following does not give oxygen on heating ?

Answer»

`(NH_(4))_(2).Cr_(2)O_(7)`
`KClO_(3)`
`Zn(ClO_(3))_(2)`
`K_(2)Cr_(2)O_(7)`

ANSWER :A
Discussion
16055.

When a sugar solution is slowly frozen, the first solid which separate out is:

Answer»

1.ice
2.SUGAR
3.solid solution of sugar and ice
4.a compound FORMED from sugar and water (HYDRATED sugar)

ANSWER :A
Discussion
16056.

The resistance of a 0.01 N solution of an electrolyte was found to 210 ohm at 25^(@)C using a conductance cell with a cell constant 0.88 cm^(-1). Calculate the specific conductance and equivalent conductance of the solution.

Answer»

Solution :`R="210 ohm, "(L)/(a)=0.88cm^(-1)`
`"Specific conductance "KAPPA=(l)/(a)xx(1)/(R )`
`=("0.88cm"^(-1))/("210 ohm")=4.19xx10^(-3)" mho.cm"^(-1)`
`=4.19xx10^(-3)"mho.m"^(-1)`
Equivalent conductance, `lambda=kappa xxV`
V has 1 GRAM equivalent dissolved given is 0.01 N in 1000 ml.
`therefore V=(1000)/(0.01)=1,00,000ml`
`lambda=4.19xx10^(-3)xx1,00,000`
`lambda=419.05"mho. cm"^(2)."gm. equiv"^(-1)`.
`=4.190xx10^(-2)" mho m"^(2)("gm. equiv")^(-1)`
Discussion
16057.

The values of van't Hoff factors for KCl, NaCl and K_2SO_4 , respectively , are ___

Answer»

2,2and2
2,2and3
1,1 and 2
1,1 and 1

Solution :is the CORRECT ORDER.
Discussion
16058.

The vapour pressure of an aqueous solution of cane sugar (mol. Mass 342) is 756 mm at 373 K. How many grams of sugar are present in 1000 g of water?

Answer»


SOLUTION :`(760-756)/(760)=(w_(2)//342)/(1000//18+w_(2)//342)." Calculate "w_(2).`
Discussion
16059.

Which of the following has highest bond energy?

Answer»

`O-O`
`S-S`
`Se-Se`
`Te-Te`.

ANSWER :B
Discussion
16060.

Which of the following is wrong about interstitial compounds ?

Answer»

their M.P. is HIGHER than parent metals
their density is higher than parent metals
their hydrides are powerful REDUCING agent than parent metals.
these are NEITHER ionic nor COVALENT

ANSWER :B
Discussion
16061.

The use of mercury is very in a number ofdeviceslike thermometer, blood pressure measuring apparatus, mercury cell (containing HgO) used inhearing aids and watchesetc. Mercury is toxic and causes pollution if it entersthe atmosphere and if somehowit enters our body , itdoes not get eliminated easily. Therefore, thesedevies are being replaced by others which do not mercury. For example , in schools , mercury thermometer sare being replaced byother thermometers ( such as using alcohol etc. ). After reading the above paragraph , answer the following questions ? (i) What values the above paragraph , answer the following questions: (ii) Why was mercury preferred in thermometers ?

Answer»

SOLUTION :(i) The use of mercury apparatuses should be avoidedas far as POSSIBLE. Before disposing off,mercury should be recoveryand STORED properly orspent cells hsould be processedfor the recovery off mercury .
(ii) Mercury was preferred in the thermometers because it is a LIQUID which does not stickto glassand hadhigh coefficientof expansion and EXPANDS at a uniform rate when heated.
Discussion
16062.

Which of the following is non-reducing sugar ?

Answer»

LACTOSE
GLUCOSE
SUCROSE
MALTOSE

SOLUTION :Sucrose
Discussion
16063.

Which given pair metals can be dissolves in NaOH solution ?

Answer»

AL , Cu
ZN , Al
Zn , Cu
Zn , Hg

Answer :B
Discussion
16064.

Write the structure of the following molecules : XeOF_4

Answer»

SOLUTION :
Discussion
16065.

Which is the most covalent

Answer»

C-O
C-Br
C-S
C-F

Solution :C-S will be most COVALENT. Covalent CHARACTER DEPENDS on the SIZE of ATOMS
Discussion
16066.

The triangleHfor the process, CH_3COOHrarrCH_3COO^(-)+H^+ is:

Answer»

Positive
Negative
Zero
Unpredicatable

Answer :A
Discussion
16067.

Which of the following element has high density

Answer»

Sc
Zn
Cu
Co

Answer :C
Discussion
16068.

The weight of methane which occupies the same volume at STP as 7.5 gmof ethane is _________g .A compound contains 40% carbon 6.6% hydrogen and the rest oxygen. If 100 ml of its decimolar solution contains 1.8 gms of its how many emperical units are present in its molecule?

Answer»


ANSWER :4
Discussion
16069.

When ethyl alcohol reacts withthionyl chloride in the presence of pyridine, the. product obtained is

Answer»

`CH_3CH_2Cl+HCl`
`C_2H_5Cl+HCl + SO_2`
`CH_3CH_2Cl + H_2O + SO_2`
`H_3CH_2Cl + Cl_2 + SO_2`

ANSWER :B
Discussion
16070.

Which one of the following forms a negativity charged sol?

Answer»

`Al_(2)O_(3). xH_(2)O`
`Cr_(2)O_(3). xH_(2)O`
`TiO_(2)`
Cds

Answer :D
Discussion
16071.

Which one of the following is Nernst equation,

Answer»

`E_("cell") = E_("cell")^(@) +(0.0591)/n "LOG" ([C]^1[D]^m)/([A]^X[B]^y)`
`E_("cell") = E_("cell")^(@) -(0.0591)/n "log" ([A]^x[B]^y)/([C]^1[D]^m)`
`E_("cell") = E_("cell")^(@) -(0.0591)/n "log" ([C]^1[D]^m)/([A]^x[B]^y)`
`E_("cell") = E_("cell")^(@) +(0.0591)/n "log" ([A]^x[B]^y)/([C]^1[D]^m)`

Answer :C
Discussion
16072.

The solubility of BaSO_(4) in water 2.42 xx 10^(3) gL^(-1) at 298 K. The value of solubility product (K_(sp)) will be (Given molar mass of BASO_(4) = 233 g mol^(-1))

Answer»

`1.08 xx 10^(-10) Mol^(2) L^(-2)`
`1.08 xx 10^(-12) mol^(2) L^(-2)`
`1.08 xx 10^(-14) mol^(2) L^(-2)`
`1.08 xx 10^(14) mol^(2) L^(-2)`

SOLUTION :SOLUBILITY of `BaSO_(4) = 2.42 xx 10^(-3) gL^(-1)`
`:. s = (2.42 xx 10^(-3))/(233) = 1.038 xx 10^(-5) mol L^(-1)`
`K_(sp) = s^(2) = (1.038 xx 10^(-5))^(2)`
`= 1.08 xx 10^(-10) mol^(2) L^(-2)`
Discussion
16073.

Which of the following phenomenon occurs when a chalk stick is dipped in ink?

Answer»

Adsorption of coloured SUBSTANCE
Adsorption of solvent 
ABSORPTION and adsorption both of solvent 
Absorption of solvent 

SOLUTION :Coloured matter is ABSORBED whereas solvent is absorbed.
Discussion
16074.

Which of these is the correct relationship between liter and mm^(3)?

Answer»

`1"LITER" = 10^(3) mm^(3)`
`1"liter" = 10^(4) mm^(3)`
`1"liter" = 10^(5) mm^(3)`
`1"liter" = 10^(6) mm^(3)`

Answer :D
Discussion
16075.

Which of the following behaves both as a nucleophile and as an electrophile ?

Answer»

`H_(3)C-CequivN`
`H_(3)COH`
`H_(2)C=CH-CH_(3)`
`H_(3)C-NH_(2)`

SOLUTION :`H_(3)C-Cequivoverset(cdotcdot)N`can act both as an ELECTROPHILE and a NUCLEOPHILE compounds with a MULTIPLE bond between carbon and a more electronegative atom can act both as an electrophile and nucleophile.
Discussion
16076.

Which weak acid has the strongest conjugate base ?

Answer»

Acetic ACID `(K_a=1.8xx10^(-5))`
Formic acid `(K_a=1.8xx10^(-4))`
HYDROFLUORIC acid `(K_a=6.8xx10^(-4))`
Propanoic acid `(K_a=5.5xx10^(-5))`

ANSWER :a
Discussion
16077.

Zn_((s))//Zn_((aq))^(2+)abs()Cu_((aq))^(2+)//Cu_((s)) In the above cell diagram, the single vertical line represents ________.

Answer»

SALT bridge
Cathode
Anode
Phase boundary

Answer :D
Discussion
16078.

Which of the following carbocation is least stable

Answer»




Solution :DUE to -M effect of `-NO_(2)` group at ORTHO position.
Discussion
16079.

Which of the following have maximum value of pK_(b) in Aqueous phase-

Answer»

N-Methyl ANILINE
N,N-di ETHYL ETHANAMINE
Benzenamine
Phenyl methanamine

Answer :C
Discussion
16080.

Which one of the following is an example for solid sol?

Answer»

Butter
Cheese
PEARLS
Pumice stone

Solution :Pearls
Discussion
16081.

The standard reduction potential of Fe^(3+), Fe^(2+)//Pt is + 0.771V. This half cell is connected with another half cell such that e.m.f. of the cell is 0.771V. What is the other half cell ?

Answer»

Solution :(i) The EMF of the standard hydrogen electrode is Zero volts.
`Fe//Fe^(3+)Fe^(2+), H^(2)""_((atm)pt)""E=0.771V`
E measured `=E_(R)-E_(L)`
(II) emf of SHE = 0
`E_("measured")=0.771V-0=0.771V`
(iii) `therefore` The other half CELL CONNECTED is Standard Hydrogen Electrode (SHE).
Discussion
16082.

The trendin ionisationenthalpyof atransitionelementis notregular because ,

Answer»

REMOVAL of oneelectron alterste relativeenergies of4sand 3DORBITALS
due todifferentelectronic CONFIGURATION(STABILITY)
Poorscreeningof 3p-orbital
due TODECREASE in effectivenuclearcharge

Answer :A
Discussion
16083.

Which one of the following exhibit chirality?

Answer»

`[Cr(OX_(3))]^(3-)`
`Cis-[PtCl_(2)(en)]`
`Cis-[RhCl_(2)(NH_(3))_(2)]^(-1)`
MER- `[CO(NO_(2))_(3)("trien")]`

Solution :`[M(A-A)_(3)]^(npm)` will exhibit optical isomerism.
Discussion
16084.

The reagents for the following conversion

Answer»

alcoholic KOH
alcholic KOH followed by `NaNH_(2)`
aquesous KOH followed by `NaNH_(2)`
`Zn//CH_(3)OH`

Solution :N/A
Discussion
16085.

Which of the following ores is the ore of copper?

Answer»

Cerrustie
SIDERITE
CHALCANTHITE
SPHALERITE

ANSWER :C
Discussion
16086.

Which one of the following structures represents nylon-6,6 polymer ?

Answer»




SOLUTION :
Discussion
16087.

Which of the following will give Tollen's test (I) CH_(3)-CH_(2)-C-=CH(II) CH_(3)C OOH(III) CH_(3)-C-=C-CH_(3)(IV) (V)CH_(3)CHO

Answer»

I,IV,V
I,V
I,II,IV,V
II,IV,V

Solution :
Discussion
16088.

Whatistheformulaof sodiumpyro phosphate?

Answer»

<P>`Na_(4)P_(2)O_(7)`
`Na_(2)P_(2)O_(7)`
`Na_(3)P_(4)O_(7)`
`Na_(3)PO_(4)`

Answer :A
Discussion
16089.

Which of the following is a 3^(@) alcohol ?

Answer»

`CH_(3)CH_(2)OH`
`CH_(3)-underset(CH_(2)CH_(3))underset(|)overset(CH_(3))overset(|)C-OH`
`underset(CH_(2)OH)underset(|)CH_(2)-OH`
`CH_(3)-underset(C_(2)H_(5))underset(|)overset(CH_(3))overset(|)C-CH_(2)OH`

SOLUTION :`CH_(3)-underset(CH_(2)CH_(3))underset(|)overset(CH_(3))overset(|)C-OH`
Discussion
16090.

Which of the following amines yields foul smelling product with holoform and alcoholic KOH?

Answer»

Ethyl amine
Diethyl amine
TRIETHYL amine
Ethyl METHYL amine

ANSWER :A
Discussion
16091.

Which of the following gases is used for providing incrt atmosphere for filling electric bulbs?

Answer»

ARGON
HELIUM
NEON
XENON

SOLUTION :Argon
Discussion
16092.

What will happen if we take Si(CH_(3))Cl_(3) as a starting material for the preparation of commercial silicon polymer?

Answer»

Solution :With `Si(CH_(3))Cl_(3)` the CHAIN will grow in three places and we will get cross-linked silicon polymer as shown below:
Discussion
16093.

What is the role of the following chemicals in food? Saccharin

Answer»

SOLUTION :ARTIFICIAL SWEETENING AGENT
Discussion
16094.

Which of the following salts when dissolved in water will get hydrolysed

Answer»

NaCl
`NH_(4)CL`
KCL
`Na_(2)SO_(4)`

Solution :`NH_(4)Cl` is hydrolysed and GIVE `[H^(+)]`
`NH_(4)Cl + H. OHhArr NH_(4)OH + HCl`
`NH_(4)^(+) + H.OH hArr NH_(4)OH + H^(+)`
Discussion
16095.

What is meant by aluminothermitc process ?

Answer»

Solution :(i) Metallic oxides such as `Cr_(2)O_(3)` can be reduced by an aluminothermitc process.
(ii) In this process, the metal oxide is mixed with aluminium powder and placed in a fire CLAY crucible.
(iii) To INITIATE the reduction process, an ignition mixture (usually magnesium and barium peroxide) is used.
`BaO_(2) + MG rarr BAO + MgO`.
(iv) During the above reaction a large amount of heat is evolved (temperature up to `2400^(@)C` is generated and the reaction enthalpy is : `852 kJmol^(-1)`) which facilitates the reduction of `Cr_(2)O_(3)` by aluminium POWER.
`Cr_(2)O_(3) + 2Al overset(Delta)rarr 2Cr + Al_(2)O_(3)`
Discussion
16096.

What is the molarity of pure water

Answer»

1
18
`55.5`
None of these

Solution :Molality is DEFINED as the no. of MOLES per 1000 gm of solvent.
`m=(1000)/(18)=55.5`.
Discussion
16097.

The two solutions A and B are separated by semipermeable membrane. If the solvent flows from A to B :

Answer»

A is more CONCENTRATED than B
A is LESS concentrated than B
Both A and B are of same concentration
Both A and B GET diluted.

Answer :B
Discussion
16098.

Which of the following change at equilibrium will shift reaction in backward direction: Fe^(3+)(aq)+SCN^(-)(aq)hArrFe(SCN)^(2+)(aq)

Answer»

Addition of water
Addition of `KOH(aq)[Fe(OH)_(3)` is insoluble in water]
Addition of `NaNO_(3)(s)`
A and B both

Solution :`Fe^(3+)(aq)+SCN^(-)(aq)hArrFe(SCN)^(2+)(aq)`
(A) For GIVEN Q `alpha` V `rArr` on addition of water `QGTK` reaction move backward
(B) `Fe^(+3)+3OH^(-)hArrFe(OH)_(3)(s)` reaction MOVES backward
Discussion
16099.

Which of the following represents the correct order of acidic strength ?

Answer»

HOCI LT HOBR lt HOI
HOCI lt HOI lt HOBr
HOBr lt HOIlt HOCI
HOI lt HOBr lt HOCI

ANSWER :D
Discussion
16100.

Write isomerism exhibited by different amines.

Answer»

SOLUTION :CHAIN, POSITION,METAMERISM, FUNCTIONAL.
Discussion