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1451.

The vapour pressure of water at 20^(@)C is 17.5 mm Hg. If 18 g of glucose (C_(6)H_(12)O_(6))is added 178.2 g of water at 20^(@)C, the vapour pressure of the resulting solution will be :

Answer»

<P>17.325 MM Hg
17.675 mm Hg
15.750 mm Hg
16.500 mm Hg

Solution :ACCORDING to Raoult's Law.
`P_(A)=P_(A)^(@)X_(A)`
`X_(A)=n_(A)/(n_(A)+n_(B))=((178.2)/18)/((188.2)/18+18/180)`
`=(9.9)/(9.94)=0.99`
`P_(A)=(17.5mm)xx0.99=17.32 mm`
Discussion
1452.

Which of the following alkali metal carbonates is the most stable towards decomposition ?

Answer»

`Li_2CO_3`
`Na_2CO_3`
`K_2CO_3`
`Cs_2CO_3`

ANSWER :D
Discussion
1453.

Which of the following will show schottky defect

Answer»

`CaF_(2)`
Zns
AgCl
CsCl

Answer :D
Discussion
1454.

Toluene is reacted with Cl_(2) in the presence of Fe Cl_(3) give p-chlorotoluene as the major product because the methyl group is 1. p-directing 2. m-directing 3. activatingh the ring by hyper conjugation 4. deactivate the ring

Answer»

1
3
ac
`1,3`

ANSWER :C
Discussion
1455.

What weight of ""^(14)C (t_((1)/(2))=5760 years) will make one curie of it ? [one curie gives 3.7 xx 10^(10) disintegrations/second (dps)]

Answer»

Solution :Let the weight of `""^(14)C` be w gram Number of `""^(14)C` nuclei= mole `XX` Av. CONSTANT
`=(w)/(14) xx 6.022 xx 10^(23)`
and `t_((1)/(2))` in second `=5760 xx 365 xx 24 xx 60xx 60`
Now, we have, `-(d(N))/(dt)= lamda (N)= (0.6932)/(t_((1)/(2))) xx N`
`3.7 xx 10^(10)= (0.6932)/(5760 xx 365 xx 24 xx 60 xx 60)xx (w)/(14) xx 6.022 xx 10^(23)`
w= 0.225g
Discussion
1456.

What is kraft temperature?

Answer»

Solution :The FORMATION of micelles TAKES place only above a particular TEMPERATURE called KRAFT temperature
Discussion
1457.

Which of the following terms indicates to the arrangement of different protein subunits in a multiprotein complex ?

Answer»

PRIMARY structure
secondary structure
tertiary structure
QUATERNARY structure

Solution :Quaternary structure refers to the overall structure of a multiprotein complex where as primary, secondary and tertiary structure REFER to the different structural LEVELS of a single protein.
Discussion
1458.

Which of the following statements are in accordance with the Arrhenius equation ?

Answer»

Rate of a REACTION increases with increase in temperature
Rate of a reaction increases with decrease in ACTIVATION energy
Rate constant DECREASES exponentially with increase in temperature
Rate of reaction decreases with decrease in activation energy.

Answer :A::B
Discussion
1459.

What is the potential of a half-cell consisting of zinc electrode in "0.01 M ZnSO_(4) solution 25^(@)C. E^(@) = 0.763 V.

Answer»

Solution :The half-cell reaction is
`Znrarr Zn^(2+)+2e^(-)`
The Nernst equation for the oxidation half-cell reaction is
`E=E^(@)-(0.0591)/(n)log[Zn^(2+)]`
The number of electrons transferred n = `2 and E^(@) = 0.763 V`
SUBSTITUTING these values in the Nernst equation we have
`E=0.763-(0.0591)/(2)(-2)`
`=0.763+0.0591=0.8221V`
CALCULATION of Cell POTENTIAL
The Nernst equation is applicable to cell potentials as well. THUS,
`E_("cell")=E_("cell")^(@)-(0.0591)/(n)logK`
K is the equilibrium constant of the redox cell reaction.
Discussion
1460.

Why aromatic amines possess low basicity ?

Answer»

Solution :Due to PRESENCE of electron drawing phenyl GROUP aromatic amines are LESS BASIC in nature. The lone pair to electron is ENGAGED in resonance.
Discussion
1461.

What would be the mass as well as molarity if the half cell reaction . 2BrO_(3)^(-) + 12H^(+) + 10e^(-) rarrBr_(2) + 6 H_(2)O

Answer»


ANSWER :1.735g, 0.1344M
Discussion
1462.

The standard heats of formation of CH_(4), H_(2)O and CH_(3)OHare -76, -242 and -266 kJ/mole respectively. The enthalpyCH_(3)OH_((l))+H_(2(g))rarrCH_(4(g))+H_(2)O_((l))

Answer»

`-4 kJ//"MOLE"`
`-556 kJ//"mole"`
`-318 kJ//"mole"`
`-52 kJ//"mole"`

SOLUTION :`DeltaH=SigmaDeltaH_(F)^(@)" (Product)"-SigmaDeltaH_(f)^(@)" (reactants)"`
`DeltaH=(-242-76)-(-266+0)=-52 kJ`.
Discussion
1463.

Which of the following is the buffer solution of strong acidic nature

Answer»

`HCOOH + HCOO^(-)`
`CH_(3)COOH + CH_(3)COO^(-)`
`H_(2)C_(2)O_(4) + C_(2)O_(4)^(2-)`
`H_(3)BO_(3)+BO_(3)^(3-)`

Solution :It is a buffer solution of strong ACID and its WEAK conjugate base.
Discussion
1464.

Which of the following is notna optically activecompound?

Answer»

Alanine
Malic ACID
Meso - tartaricacid
Lacticacid

ANSWER :C
Discussion
1465.

When primary amides are treated with P_(2)O_(5), they give :

Answer»

Amines
Carboxylic acids
Nitriles
Alcohols.

Answer :C
Discussion
1466.

What are fuel cells?

Answer»

Solution :A galvanic cell that are desgined to convert, the ENERGY of FUEL like HYDROGEN, methane, methanol ETC. into electrical energy.
Discussion
1467.

Which of the following melts below 298 k.

Answer»

`NaCI_(s)`
`Si_(s)`
`Ar_(s)`
`Na_(s)`

ANSWER :C
Discussion
1468.

The treatment of diseases by using drugs is known as

Answer»

physiotherapy
magneto therapy
chemotherapy
occupuncture

Answer :C
Discussion
1469.

What is the major product obtained from the following reaction?

Answer»




ANSWER :C
Discussion
1470.

The value of one Faraday is

Answer»

`95500C mol^-1`
`96550 C mol^-1`
`96500 Cmol^-1`
`98500 C mol^-1`

ANSWER :C
Discussion
1471.

Which of the following statements is/are correct about the given reaction ? (A) (B)(C_(7)H_(5)Br_(3)O_(2)) (C ) (D)(C_(7)H_(6)Br_(2)O_(2))

Answer»

The PRODUCTS (B) and (D), respectively, are: <BR>
The products (B) and (D), respectivvely, are:

In the FORMATION of the both products (B) and (D), one Be is obtained by ipso substitution while the other Br is obtained by SE reaction.
In the formation of (B) and (D), TWO Br atoms are obtained by ispo substitution, whereas the other Br is obtained by SE reaction.

Solution :NA
Discussion
1472.

What are surfactants. Gove one point of distinction between soaps and detergents.

Answer»
Discussion
1473.

The reduction of CH_3CN to CH_3CH_2NH_2 is called :

Answer»

ROSENMUND REDUCTION
CLEMMENSEN's reduction
Mendius reduction
HOFMANN's reduction

Answer :C
Discussion
1474.

What is the weight of oxygen that is required for the complete combustion of 2.8 kg of ethylene

Answer»

9.6 kg
96.0 kg
6.4 kg
2.8 kg

Answer :A
Discussion
1475.

The unit of rate constant for a zero order reaction is

Answer»

litre `sec^(-1)`
litre `"MOLE"^(-1) sec^(-1)`
mole `"litre"^(-1) sec^(-1)`
mole `sec^(-1)`

SOLUTION :The unit of k for zero order REACTION mole `litre^(-1) sec^(-1)`.
Discussion
1476.

The theory of electrolytic dissociation was given by

Answer»

DALTON
FARADAY
OSTWALD
ARRHENIUS

ANSWER :D
Discussion
1477.

Which of the following is an example of cationic detergent?

Answer»

SODIUM lauryl sulphate
sodium PALMITATE
sodium dodecyl BENZENE sulphonate
n-hexa decyl timethyl AMMONIUM CHLORIDE

Solution :n-hexa decyl timethyl ammonium chloride
Discussion
1478.

What happens when: (write chemical equations only ) (a) Anhydrous AlCl_(3) is exposed to atmosphere. (b) AlCl_(3) dissolves in aqueous sodium hydroxide (excess)

Answer»

Solution :(a)`AlCl_(3)+3H_(2)OtoAL(OH)_(3)+3HCl , (HCl` fumes in air).
(B)`AlCl_(3)+3NaOH to AL(OH)_(3)darr+3NaCl`
`Al(OH)_(3)+OH^(-)to[Al(OH)_(4)]^(-)`
Discussion
1479.

Which of the following can give cannizzaro's reaction with a base

Answer»

`CH_(3)(CH_(2))_(2)CHO`
`(CH_(3))_(2)CHCH_(2)CHO`
`(CH_(3))_(3)C CHO`
`CH_(3)CH_(2)UNDERSET(CH_(3))underset(|)CHCHO`

Answer :C
Discussion
1480.

Which two sets of reactants best represent the amphoteric character of Zn(OH)_(2)? Set1: Zn(OH)_(2)(s) and OH^(-)(aq) Set 2:Zn(OH)_(2)(s) and H_(2)O(l) Set 3:Zn(OH)_(2)(s) and H^(+)(aq) Set 4 : Zn(OH)_(2)(s) and NH_(3)(aq)

Answer»

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

Solution :`UNDERSET("ACID")(ZN(OH)_(2))+underset("BASE")(2OH^(-)) to underset("Salt")(ZnO_(3)^(2-)+underset("Water")(2H_(2)O)`
`underset("Base")(Zn(OH)_(2))+underset("Acid")(2H^(+)) to underset("Salt")(Zn^(2+)+underset("Water")(2H_(2)O)`
Discussion
1481.

Wrong statement about O_(2)F_(2) is

Answer»

It is non-planar molecule
It is evolved when DIL NAOH REACTS with `F_(2)`
It is polar molecule
It has both polar and non-polar BONDS.

Answer :B
Discussion
1482.

Which of the following cannot act as an oxidising agent ?

Answer»

`S^(2-)`
`Br_(2)`
`HSO_(4)^(-)`
`SO_(3)^(2-)`

Answer :A
Discussion
1483.

Which of the following is useful as a food preservative

Answer»

SALTS of sorbic acid
Ascorbic acid
Sucrolose
Citric acid

SOLUTION :Food PRESERVATIVES are used to prevent the spoilage of food salts of sorbic acid, propanoic acid. Table salt, sodium benzoate etc ACT as food preservatives.
Discussion
1484.

The units of conductivity are

Answer»

`ohm^-1`
`ohm^-1cm^-1`
`ohm^-2cm^-2equiv^-1`
`ohm^-1cm^2`

ANSWER :B
Discussion
1485.

Which of the following are biopolymers?

Answer»

NUCLEIC ACIDS
LEATHER
Bakelite
Orlon

Answer :A::B
Discussion
1486.

What is the reagent used for dehydrohalogenation of an alkyl halide?

Answer»

Solution :ALCOHOLIC KOH.
for EXAMPLE, `underset("Bromoethane")(CH_(3)-CH_(2)-Br) underset(("Dehydrohalogenation"))OVERSET("Alc KOH, "Delta)to underset("Ethene")(CH_(2)=CH_(2))+KB r+H_(2)O`
Discussion
1487.

Treatment of acetaldehyde with ethyl magnesium bromide and subsequent hydrolysis gives:

Answer»

1-butanol
2-butanol
1-propanol
Tert-butanol

Answer :B
Discussion
1488.

Which of the following is used as a local anaesthetic agent ?

Answer»

Cocaine
ETHYL chloride
Mescaline
SECONAL

Solution :cocaine, ethyl chloride used as LOCAL ANESTHETICS
Discussion
1489.

Which is a stronger reducing agent, SbH_(3) or BiH_(3) and Why?

Answer»

SOLUTION :`BiH_(3)`, because the STABILITY of hydrides decreases on MOVING from `SbH_(3)` to `BiH_(3)`.
Discussion
1490.

Which component of strach in branched polymer of a glucose and insolublein water .

Answer»

SOLUTION :AMYLOPECTIN.
Discussion
1491.

Which out of helium and neon would adsorb on the surface of charcoal more readily and why?

Answer»

Solution :Neon would adsorb more READILY DUE to its greater molecular mass and SURFACE area and hence greater VAN der WAALS. forces.
Discussion
1492.

Which of the following aqueous solution has the highest boiling point

Answer»

`0.1M KNO_(3)`
`0.1M Na_(3)PO_(4)`
`0.1M BaCI_(2)`
`0.1M K_(2)SO_(4)`

Solution :Greater the number of ions in the electrolyte HIGHER is the elevation in boiling point.
Discussion
1493.

Which of the following species can act as strongest base

Answer»

`""^(ODOT)OH`
`""^(odot)OR`
`""^(odot)OC_(6)H_(5)`

ANSWER :B
Discussion
1494.

Which one of the following is the most basic?

Answer»

Ammonia
Methylamine
Dimethylamine
Aniline

Answer :C
Discussion
1495.

Which solution will show highest resistance during the passage of current

Answer»

0.05 N NaCl
2N NaCl
0.1 N NaCl
1N NaCl

Answer :B
Discussion
1496.

Which of the following statements are ture about semi-conductors ?

Answer»

Silicon doped with ELECTRON rich impurity is a p-type semi-conductor
Silicon doped with an electron rich impurity is an n-type semi-conductor
Delocalised electrons increase the conductivity of doped silicon
An electron vacancy increases the conductivity of a-type semi-conductor.

Solution :(B,c) are corrcet STATEMENTS.
(a) Silicon doped with electron rich impurity is an n-type semiconductor. Therefore, STAEMENT (a) is false. ltbRgt (b) The conductivity of n-type semi-conductors increases DUE to extraelectrons and not because of electron valency. Therefore statement (b) is false.
Discussion
1497.

The solublity of AgCl is formed when equal volumes of the following are mixed. [K_(sp) for AgCl = 10^(-10)]

Answer»

`2.0 xx 10^(-5) M`
`1.0 xx 10^(-4) M`
`5.0 xx 10^(-9) M`
`2.2 xx 10^(-4) M`

Solution :`{:(,CaCl_(2),hArr,Ca^(2+)+,2Cl^(-)),("Concen.",0.04,,0.04,0.08):}`
For AgCl
`AgCl hArr AG^(+) + Cl^(-)`
`K_(sp) = [Ag^(+)][Cl^(-)]`
`4.0 xx 10^(-10) = [S][S+0.08]`
`4.0 xx 10^(-10) = S^(2) + S xx 0.08 [S^(2) lt lt lt 1]`
`4.0 xx 10^(-10) = S xx 0.08`
`S = (4.0 xx 10^(-10))/(0.08) = 0.5 xx 10^(-8) = 5 xx 10^(-9)`.
Discussion
1498.

Which of the following reactions proceed at low pressure

Answer»

`N_(2)+3H_(2)hArr2NH_(3)`
`H_(2)+I_(2)hArr2HI`
`PCl_(5)hArrPCl_(3)+Cl_(2)`
`N_(2)+O_(2)hArr2NO`

Solution :At low pressure, reaction proceeds where volume is increasing. This is the favoourable condition for the reaction. `PCl_(5)hArrPCl_(3)+Cl_(2).`
Discussion
1499.

When a rod of metal A is dipped in an aqueous solution of metal B (concentration of B^(2+) ion being 1M) at 25^(@)C, the standard electrodepotentials are A^(2+)//A=-0.76volts, B^(2+)//B=+0.34 volts

Answer»

A will gradually dissolve
B will DEPOSIT on A
No reaction will occur
Water WIL decompose into `H_(2) and O_(2)`

Solution :Since `E_(A^(2+)//A)^(o) lt E_(B^(2+)//B)^(o)`. A has GREATER TENDENCY to be oxidized.
`A+B^(2+)toA^(2+)+B`.
Discussion
1500.

The two strands in DNA are not identical but complementary. Explain.

Answer»

Solution :Base PAIRING RULE is followed, A = T and G `-= C`.
Discussion