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18351.

Write the structural formula of aspirin.

Answer»

SOLUTION :
Discussion
18352.

Which of the following can act as an nucleophile ?

Answer»

`BF_3`
`FeCl_3`
`ZnCl_2`
`C_2H_5MgBr`

ANSWER :D
Discussion
18353.

Which of the following complex ion is not expected to absorv visible light ?

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`[Ni(H_(2)O)_(6)]^(3+)`
`[Ni(CN)_(4)]^(2-)`
`[Cr(NH_(3))_(6)]^(3+)`
`[Fe(H_(2)O)_(6)]^(2+)`

Answer :B::C::D
Discussion
18354.

The vapour pressure of benzene is 75 mm and that of toluene is 22 m at 20^(@)C temperature. The solution prepared by mixing 78 gram benzene and 46 gram toulene then, what will be the partial pressure of benzene in the mixture ?

Answer»

25
50
100
75

Solution :`p_(1)^(0)= 75 mm, p_(2)^(0)=22mm`
`w_(1)=78 g,w_(2)=56 g`
`n_(1)=1` mole , `n_(2)=0.5` mole
`X_(1)=(1)/(1.5), X_(2)=(0.5)/(1.5)`
PARTIAL PRESSURE of benzene,
`P=P_(1)^(0)X_(1)=(75)/(1.5)=50` mm.
Discussion
18355.

Write the IUPAC names of the following compounds K_3[Fe(C_2O_4)_3]

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SOLUTION :Potassiumtrioxalatoferrate(III)
Discussion
18356.

Which of the following statements is not true

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Paramagnetic substances are weakly ATTRACTED by magnetic field
Ferromagnetic substances cannot be MAGNETISED permanently
The DOMAINS in antiferromagnetic substances are oppositely oriented with respect to each other
Pairing of electrons CANCELS their magnetic moment in the diamagnetic substances

Solution : Ferromagnetic substances can be magnetised permanently.
Discussion
18357.

Which polymer is obtained by self condensation polymerization process ?

Answer»

Nylon-6,6
Nylon-6
Dacron
MELAMINE

SOLUTION :Nylon-6
Discussion
18358.

Which of the following is correct about lyophilic sols ?

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They are IRREVERSIBLE.
They are formed by INORGANIC substances.
They are radily coagulated by addidion of electrolytes.
They are self-stabilized.

SOLUTION :Lyophilic sols are self stabilized DUE to their hydration in the solution.
Discussion
18359.

Which of the followingis conjugatebaseof(CH_(3))_(3)NH^(+)

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`(CH_(3))_(3)N^(+)`
`(CH_(3))_(3)N`
`(CH_(3))_(2)NH`
`(CH_(3))_(2)N^(+)H`

Answer :B
Discussion
18360.

Which of the following is /are aprotic solvents

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`CH_3COCH_3`
`HCON(CH_3)_2`
`CH_3SOCH_3`
all the above

ANSWER :D
Discussion
18361.

The pH of a solution of AgCI(s) with solubility product 1.6 xx 10^(-10) in 0.1 M Nacl solution would be :

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Zero
`1.26 XX 10^(-5)M`
`1.6 xx 10^(-9) M`
`1.6 xx 10^(-11) M`

Solution :`AgCl hArr AG^(+) + Cl^(-)`
`S hArr S + 0.1`
`K_(sp) = [Ag^(+)][Cl^(-)]`
`1.6 xx 10^(-10) = S xx (S + 0.1) = S xx 0.1`
`1.6 xx 10^(-9) = S`
Discussion
18362.

Which element occurs in free state :

Answer»

C
Si
Ge
Sn

Answer :A
Discussion
18363.

Use of chlorofluorocarbons is not encouraged because

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they are HARMFUL to the eyes of people who use it
they DAMAGE the refrigerators and air conditioners
they cat away the ozone in the atmosphere
they destroy the oxygen layer.

Solution : Chlorofluorocarbons are used in air-conditioning and in DOMESTIC refrigerators for COOLING purposes but they are quite harmful for the environment as they are RESPONSIBLE for ozone depletion.
Discussion
18364.

Which of the following pairs represents linkage isomers ?

Answer»

`[Pd(PPh_(3))_(2)(NCS)_(2)]" and "[Pd(PPh_(3))_(2)(SCN)_(2)]`
`[Co(NH_(3))_(5)No_(3)]SO_(4)" and "[Co(NH_(3))_(5)(SO_(4))]No_(3)`
`[PT(NH_(3))_(4)Br_(2)]" and "[PtBr_(2)(NH_(3))_(4)]Cl_(2)`
`[Cu(NH_(3))_(4)][PtCl_(4)]" and "[Pt(NH_(3))_(4)][CuCl_(4)]`

Answer :A
Discussion
18365.

Under what condition will the molaity of a solute not be equal to its molarity ?

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SOLUTION :CONSIDER DENSITY of the SOLVENT
Discussion
18366.

What happens to the half life period of a first order reaction if the concentration of the reactants is increased ?

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SOLUTION :REMAINS same.
Discussion
18367.

Whatis fool's gold?

Answer»

SOLUTION :IRON pyrits `(FeS_2) `is CALLED FOOL's goldbecauseof its superficialresemblance to GOLD.
Discussion
18368.

Which of the following species is an acid and also a conjugatebase of another acid

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`HSO_(4)^(-)`
`H_(2)SO_(4)`
`OH^(-)`
`H_(3)O^(+)`

Solution :`H_(2)SO_(4) RARR H^(+) + HSO_(4)^(-) rarr H^(+) + SO_(4)^(--)` ACID `H_(2)SO_(4)`.
Discussion
18369.

When an organic acid reacts with____in presence of a few drops of conc. H_(2)SO_(4), an ester is formed and the process is called_____.

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SOLUTION :An ALCOHOL, ESTERIFICATION.
Discussion
18370.

What is called nitro compound? Give one example.

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Solution :(i) Ntiro COMPOUNDS are considered as the DERIVATIVES of hydrocarbosn. If ONE of the hydrogens atomof hydrocarbon is replaced by the `NO_(2)` group, the RESULTANT organic compound is called a ntiro compound.
(ii) E.g., `CH_(3)-CH_(2)-NO_(2)` Nitro ethane
Discussion
18371.

Which isthe most abundant metal in the sea water?

Answer»

SOLUTION :SODIUM
Discussion
18372.

What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15^(@)C and the pressure is 1.5 atm. If the bubble then rises to the surface where the temperature is 25^(@)C and the pressure is 1.0 atm ?

Answer»

Its volumewill become GREATER by a factor of 2.5
Its volumewill become greater by a factor of 1.6
Its volumewill become greater by a factor of 1.1
Its volumewill become greater by a factor of 0.70

Solution :`(p_(1)V_(1))/( T_(1)) = ( p _(2) V_(2))/( T_(2))`
`p_(1) = 1.5 atm, T_(1) = 273 + 15 = 288 K `
`p_(2) = 1.0 atm, T_(2) = 273 + 25 = 298 K`
`( 1.5 xx V_(1)) /( 288) = ( 1 xx V_(2))/( 298)`
`V_(2) = ( 1.5 xx V_(1) xx 298)/(288 xx 1 )`
`1.55 V_(1) = 1.6 V_(1)`
Discussion
18373.

Whichgive yellowoily liquidwith nitrousacid ?

Answer»

ETHYL AMINE
DIETHYLAMINE
TRIMETHYL amine
METHYL amine

Solution :Secondaryamine givesoilyyellowliquidwithnitrousacid
Discussion
18374.

Which of the following statements are correct about the mechanism of this reaction ?

Answer»

A carbocation will be formed as an intermediate in the reaction.
`OH^(-)` will attach the substrate (ii) from one side and `Cl^(-)` will leave it simultaneously from other side.
An unstable intermediate will be formed in which `OH^(-)` and `Cl^(-)` will be ATTACHED by weak bonds.
Reaction proceeds through `S_(N)1` mechanism.

Solution :The `2^(@)` ALKYL HALIDE in presence of `OH^(-)` proceeds through `S_(N)1` reaction by FORMATION of carbocation intermediate.
Discussion
18375.

Which of the following will produce isopropyl amine - (I) (CH_(3))_(2)CO overset(NH_(2)OH)rarr X overset(LiAlH_(4))rarr (II) CH_(3)-CH_(2)-CHO overset(NH_(3))underset("heat")rarr X overset(LiAlH_(4))rarr (III) (CH_(3))_(2)CH-OH+PCl_(5)rarr X overset(NH_(3))rarr (IV) CH_(3)-CH_(2)-CH_(2)-NH_(2)overset("heat")rarr

Answer»

I, II
II, III
I, III
IV only

Solution :`(CH_(3))_(2)CO overset(NH_(2)OH)rarr (CH_(3))_(2)CH=N-OH overset(LiAlH_(4))rarr (CH_(3))_(2)CHNH_(2)`
`(CH_(3))_(2)CHOH overset(Cl_(5))rarr (CH_(3))_(2)CHCl overset(NH_(3))rarr (CH_(3))_(2)CHNH_(2)`
Discussion
18376.

What volume of C CI_4(d = 1.6 g/cc) contain6.02 X 10^(25)C CI_4 molecules (CI = 35.5)

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10.5 L
250 mL
9.625 L
1.712 L

Answer :C
Discussion
18377.

What is the difference in the O.N- of Cr between X and Z

Answer»
Discussion
18378.

Whichof the following derivatives of carboxy - lic acid onhydrolysis will give brown precipitate with Nessler 's reagent?

Answer»

ACID anhydride
Acid chloride
Acid amide
Ester.

Solution :Acid amides on HYDROLYSIS GIVE ammonia which gives brownprecipitate with Nessler .s REAGENT.
Discussion
18379.

Write the balanced chemical equation with condition involved in the manufacture of nitric acid by Ostwal's process .

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SOLUTION :`4NH_(3)+5O_(2)OVERSET(Pt-Rh)underset("500k, 9bar")rarr 4NO+6H_(2)O`
`2NO+O_(2)rarr2NO_(2)`
`3NO_(2)+H_(2)Orarr2HNO_(3)+NO`
Discussion
18380.

When CH_(2)=CH-O-CH_(2)CH_(3) reacts with one mole of HI, one o the products formed is

Answer»

ethane
ethanol
iodoethene
ethanal

Solution :
Discussion
18381.

Which of the following is/are used as disinfectant ?

Answer»

CHLORINE
`SO^(2)`
Phenol
All of these

Answer :D
Discussion
18382.

There are four radioactive decay series called thorium (4n), uranium (4n + 2), actinium (4n + 3) and neptunium (4n + 1) series. Neptunium series is artifical while other three series are natural. End products of each radioactive decay series have stable nuclei. All natural decay series terminate at lead but neptunium or artificial series terminates at bismuth. The starting isotope and the end product isotope of actinium series are:

Answer»

`._(88)^(227)Ac` and `._(82)^(208)Pb`
`._(92)^(235)U` and `._(82)^(207)Pb`
`._(92)^(238)U` and `._(82)^(207)Pb`
`._(92)^(235)U` and `._(82)^(208)Pb`

Answer :B
Discussion
18383.

What are the reagents required to prepare Benzal aniline (or) Schiff's base?

Answer»

BENZYL AMINE + AMMONIA
Benzal amine + Ammonia
BENZALDEHYDE + ANILINE
Phenol + Aniline

Solution : Benzaldehyde + Aniline
Discussion
18384.

Which one of the followingsets from the biodegradablepolymer ?

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`CH_(2)=CH-CN and CH_(2)=CH-CH=CH_(2) `
`H_(2)N-CH_(2)-COOH and H_(2)N-(CH_(2))_(5)-COOH`

Solution :Biodegradablepolymers have tendency to break down and loosetheir initial characteristics , e.g. `H_(2)N-CH_(2)-COOH+HNH-(CH_(2))_(5)-COOH underset(-H_(2)O)overset(Delta)to underset("Nylon-2-nylon-6")([--HN-CH_(2)-CO-NH-(CH_(2))_(5)-CO--]_(n)`
Discussion
18385.

When an electrolyte solution conducts electricity, current is carried out by:

Answer»

Electrons
Cations and anions
Neutral atoms
None

Answer :B
Discussion
18386.

Which of the following is used in cancer chemotherapy?

Answer»

Ni
Po
Co
Rn

Answer :C
Discussion
18387.

When 80 gm CH_(4) is burnt completely , CO and CO_(2) gases are formed in 1:4 mole ratio. What is the mass of O_(2) gas used in combustion.

Answer»


ANSWER :304 GM
Discussion
18388.

Which is true statement about H_(2)O :

Answer»

hardness can be REMOVED by passing through ION exchange resin
its PRESENCE can be DETECTED by ANHYDROUS `CuSO_(4)`
it is amphoprotic
all are correct.

Answer :D
Discussion
18389.

Why are the elements of Group-18 known as noble gases ?

Answer»

Solution :The elements present in Group-18 have their valence SHELL orbitals completely filled and therefore react with a few elements only under CERTAIN conditions. Therefore, they are now KNOWN as NOBLE GASES.
Discussion
18390.

What is meant by positive and negative deviation from Raoult's law and how is the sign of Delta H_(" mix") related to positive and negative deviations from Raoult's law ?

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Solution :Positive deviations from Raoult.s law : Here the partial pressure component .A. in the mixture of .A. and .B. is more than that calculated from Raoult.s law. SIMILARLY, the partial vapour pressure of component .B. can be higher than calculated from Raoult.s law. For example, water and ethanol, chloroform and water, benzene and methanol, ACETIC acid and toluence, acetone and ethanol, methanol and `H_2O `. In other words, force of attraction between`A harr B lt A harr A and B harr B.`
For positive deviation, `Delta H_("Mixing") = + ve and Delta V _("(mix)")= + v E`
Negative deviations from Raoult.s law : (Here the partial vapour pressure of component .A. is FOUND to be less than calculated from Raoult.s law on adding the second component .B.. When .A. is added to .B., the partial vapour pressure of solution is less than that of ideal solution of same COMPOSITION. For example, chloroform and acetone, chloroform and methyl acetate, `H_2Oand HCI, H_2 O and HNO_3` etc.
Discussion
18391.

What are the products obtained on complete hydrolysis of DNA. Write down the strucutre of sugar present in DNA.

Answer»

Solution :The COMPLETE hydrolysis of DNA GIVES :
(i) deoxyribosesugar (ii) Nitrogeneous bases like purine and pyrimidine (III) PHOSPHORIC acid.
The structure of sugar PRESENT in DNA is deoxyribase and its structure is:
Discussion
18392.

Which one of th efollowing does not form a chelate with oxalate ion by reacting in aqueous solution ?

Answer»

cis-`[CO(NH_(3))_(4)Br_(2)]^(+1)`<BR>cis-`[Co(NH_(3))_(4)Cl_(2)]^(+1)`
cis-`[Co(en)_(2)Cl_(2)]^(+1)`
trans-`[Co(en)_(2)Cl_(2)]^(+1)`

Solution :C is -complexes can form chelate . But trans cannot from chelate ring as it cannot be STABLE .
Discussion
18393.

Which of the following elements (M) reacts with HNO_3" to form "MO_2 ?

Answer»

<P>`P_4`
Mg
Zn
Sn

Solution :`Sn+underset(("Hot and conc.""))(4HNO_(3) )to SnO_(2)+4NO_(2)+2H_(2)O`
(a). `P_(4)+underset(("Conc.""))(20 HNO_3)to 4H_(3)PO_(4)+20 NO_(2)+4H_(2)O`
(b). `underset(("very dilute"))(Mg)+HNO_(3) to Mg(NO_(3))_(2)+H_(2)`
(c). Zinc reacts with `HNO_(3)` in different ways.
`Zn+4HNO_(3) to Zn(NO_(3))_(2)+2NO_(2)+2H_(2)O`
`4Zn+10HNO)_3 to 4Zn(NO_(3))_(2)+N_(2)O+5H_(2)O`
`5Zn+12HNO_(3) to 5Zn(NO_(3))_(2)+N_(2)+6H_(2)O`
`4Zn+10HNO_(3) to 4Zn(NO_(3))_(2)+6H_(2)O+NH_(4)NO_(3)`
Discussion
18394.

Which of the following compounds will be most reactive for S_(N)1 reaction.

Answer»




ANSWER :D
Discussion
18395.

What are glycosidic linkages ? In which type of biomolecules are they present ?

Answer»

Solution :The ether linkages which connect the TWO MOLECULES of a monosaccharide are called glycosidic linkages. These are present in oligosaccharides (i.e., disaccharides , triasaccharides , etc.) and POLYSACCHARIDES.
Discussion
18396.

Which of the following reactions proceeds with retention of configuration?

Answer»




ANSWER :A
Discussion
18397.

The typical reactions of aldehyde is

Answer»

Electrophilic ADDITION
NUCLEOPHILIC substitution
Nucleophilic addition
Nucleophilic elimination

Solution :Nucleophilic addition of `HCN, NaHSO_(3)` ETC.
Discussion
18398.

What is synthetic rubbers. Write its two examples.

Answer»

Solution :Synthetic rubber is any vulcanizable rubber LIKE POLYMER, which is capable of getting stretched to TWICE its LENGTH. However, it returns to its original shape and size as soon as the external stretching force is released.
THUS, synthetic rubbers are either homo- polymers of 1,3-butadiene derivatives or copolymers of 1,3-butadiene or its derivatives with another unsaturated monomer.
Ex.: Neoprene, Buna-N
Discussion
18399.

When ethanol reacts with acetic acidin presence of H_2SO_4, the product formedis an ester . Here the ethanol works as a/an______.

Answer»

ELECTRON rich species
electron DEFICIENT species
ELECTROPHILE
lewis acid

Answer :A
Discussion
18400.

The value of Van't Hoff factor for a solution is more than 1. What does it singnigy ?

Answer»

SOLUTION :SOLUTE DISSOCIATES in soluteion
Discussion