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89851.

(A) Ethyl benzoate is not neutral towards litmus. (R) Ethyl benzoate gives claisen condensation reactiotion with ethyl acetate

Answer»

If both (A) and ( R) are CORRECT and ( R) is the correct EXPLANATION of (A).
If both (A) and (R) are correct but (R) is not correct explanation of (A).
If (A) is correct but ( R) is INCORRECT.
If (A) is incorrect but ( R) is correct.

ANSWER :D
Discussion
89852.

(A) : Ethyl benzene on oxidation with alkaline KMnO_(4) produces benzoic acid . (R) : Benzoic acid is less acidic than acetic acid .

Answer»

Both A & R are true , R is the CORRECT EXPLANATION of A
Both A & R are true , R is not correct explanation of A
A is true , R is FALSE
A is false , R is true

ANSWER :C
Discussion
89853.

(A): Ethylenediaminetetraacetate ion forms a 1:1 stoichiometric complex with Co^(2+) ion (R): It has six donor atoms which coordinate simultaneously to the metal ion.

Answer»

Both A & R are true, R is the CORRECT EXPLANATION of A
Both A & R are true, R is not correct explanation of A
A is true, R is false
A is false, R is true

Answer :A
Discussion
89854.

(A) Ethyl alcohol is soluble in organic solvents(R) Ethyl alcohol is having non polar ethyl group.

Answer»

Both A & RARE true, R is the correct EXPLANATION of A
Both A & Rare true, R is not correct explanation of A
A is true, R is FALSE
A is false, R is true

Answer :A
Discussion
89855.

(A) Ethyl acetoacetate gives reddish violet colour on treatment with ferric chloride. (R) Keto form is ominant in it.

Answer»


ANSWER :B
Discussion
89856.

A : Ethers can't be distilled upto dryness due to fear of explosion .R :Due to the formation of superoxide , it is explosive

Answer»

If both ASSERTION & REASON are true and the reason is the correct explanation of the assertion, then MARK (1)
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
If Assertion is true STATEMENT but Reason is false , then mark (3)
If both Assertion and Reason are false statements , then mark (4)

Answer :C
Discussion
89857.

(A): Ethers behave as bases in the presence of mineral acids. (R): Oxygen atom in ether is having lone pair electrons.

Answer»

Both (A) and (R) are TRUE and (R) is the correct explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Answer :A
Discussion
89858.

A : Ethers can be dried by using sodium wire. R: Ethers do not react with sodium.

Answer»

a
b
c
d

Answer :A
Discussion
89859.

A: Ethers behave as bases in the presence of mineral acids. R: It is due to the presence of lone pair of electrons on the oxygen.

Answer»

a
b
C
Dimethyl ether

Solution :Due to the presence of lone PAIR of electrons on OXYGEN atom, ethers behave as base and form stable oxonium salts with MINERAL acids.
`C_(2)H_(5)-underset(* *)overset(* *)O- C_(2)H_(5) +HCl to C_(2)H_(5)- underset(H)underset(|)overset(o+)O-C_(2)H_(5)overset(Ө)Cl`
Discussion
89860.

(A):Ethers are relatively inert when compared to C_(2)H_(5)OH. (R): In ethyl alcohol both carbon and oxygen undergo sp^(3) hybridisation.

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :B
Discussion
89861.

(A) Ethers are not generally prepared by acid dehydration of 2^@ and 3^@ alcohols (R) dehydration of 29 and 30 alcohols gives alkenes by elimination

Answer»

Both (A) and (R) are true and (R) is the CORRECT explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :A
Discussion
89862.

(A): Ethanol is miscible in all proportions with water. (R): Hydrogen bonds are formed between water and alcohol molecules.

Answer»

Both A & RARE true, R is the CORRECT explanation of A
Both A & Rare true, R is not correct explanation of A
A is true, R is false
A is false, R is true

Answer :A
Discussion
89863.

(A) Ethanamide (CH_(3)CONH_(2) ) undergoes dehydration by heating with P_(2)O_(5) . (R) Ethanamide undergoes dehydration to give nitro compound.

Answer»

If both (A) and ( R) are CORRECT and ( R) is the correct EXPLANATION of (A).
If both (A) and (R) are correct but (R) is not correct explanation of (A).
If (A) is correct but ( R) is INCORRECT.
If (A) is incorrect but ( R) is correct.

ANSWER :C
Discussion
89864.

A : Esters on reduction with LiAlH_(4) forms alcohols. R : Esters having at least two alpha-Hydrogen atoms undergo Claisen condensation.

Answer»

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then MARK (1).
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
If Assertion is true statement but Reason is false, then mark (3).
If both Assertion and Reason are false STATEMENTS, then mark (4).

Answer :B
Discussion
89865.

(A) Equivalent mass of KMnO_4 is equal to one-third of its molecular mass when it acts as an oxidising agent in faint alkaline medium (R) Oxidation number of Mn is +7 KMnO_4

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Solution :Both (A) and (R) are true and (R) is not the correct explanation of (A)
Discussion
89866.

(A) : Esters have lower boiling points than isomeric carboxylic acids . (R) : Carboxylic acids have strong inter molecular hydrogen bonding .

Answer»

Both (A) and (R) are true and (R) is the CORRECT explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :A
Discussion
89867.

(A): Equivalent mass of K_(2)Cr_(2)O_(7), when it acts as oxidizing agent in acidic medium, is M/3 (R) : During reduction, oxidation number of chromium changes from +6 to +3

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Solution :Both (A) and (R) are false
Discussion
89868.

(A) Enzymecatalysed reactions are of first order. (R ) Enzyme never undergoes any change.

Answer»

Both (A) and (R ) are true and (R ) is the CORRECT EXPLANATION of (A)
Both (A)and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is FALSE
Both (A) and (R ) are false

ANSWER :D
Discussion
89869.

(A) Enzymes are globular proteins. (R) Enzymes provide active site to substrate.

Answer»

Both A & R are TRUE, R is the correct EXPLANATION of A
Both A & R are true, R is not correct explanation of A
A is true, R is FALSE
A is false, R is true

Answer :C
Discussion
89870.

(A) Enrichement of U^(235) from a mixture containing more abundant U^(238) is based on diffusion of UF_(6). UF_(6) is a gaseous compound under ordinary conditions.

Answer»

If both (A) and (R ) are CORRECT and (R ) is the correct EXPLANATION for (A).
If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )
If both (A) and (R ) are incorrect.
If both (A) and (R ) are incorrect.

Answer :A
Discussion
89871.

(A) Empricial formula of glucose is HCHO. (R) Molecular formula of glucose will also be equal to HCHO

Answer»

If both (A) and (R) are CORRECT and (R) is the correct EXPLANATION of (A).
If both (A) and (R) are correct but (R) is not the correct explanation of (A).
If (A) is correct but (R) is WRONG.
If (A) is wrong but (R) is correct.

Answer :C
Discussion
89872.

(A) Elements of 4f sries are called Lanthanides (R) Lanthanum Belongs to 'f' block

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Solution :Both (A) and (R) are true and (R) is not the correct explanation of (A)
Discussion
89873.

write the open chain structure of glucose.

Answer»

Solution :(1) Elemental analysis and molecular weight determination show that molecular formula of glucose is `C_(6)H_(12)O_(6)`.
(2) Complete reduction with Hydrogen Iodide and Red Phosphorus gives n-hexane,which indicates that carbon atoms in glucose are in straight CHAIN.
(3) Glucose reacts with acetic anhydride to form penta acetyl derivative which shows the presence of 5-OH groups in glucose.
(4) Glucose reacts with hydroxylamine to form an glucose oxime which indicates the presence of > C = 0 (keto) group in glucose.
(5) On MILD oxidation with bromine water glucose is converted to gluconic acid, when reduced with excess of Hl yields n-hexanoic acid. `C_(5)H_(11)O_(5)CHOunderset(fol)to C_(5)H_(11)O_(5)COOHunderset(11)toCH_(3) (CH_(2))_(4) COOH`
gluconic acidn-hexanoic acid
This clearly shows that glucose CONTAINS 6 carbon atoms in a straight chain with -CHO at one end, which gives -COOH on oxidation.
(6) Based on the above reaction glucose open - chain structure can be given as follows:

From the above structure the IUPAC name of glucose is 2,3,4,5,6 Pentahydroxyhexanal.
Discussion
89874.

(A): Elements of second and third transition series have nearly same atomic radii (R): Lanthanide contraction is observed in the elements from atomic number 58 to 71.

Answer»

Both (A) and (R) are true and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not correct explanation of (A)
(A) is true but (R) is FALSE
(A) is false but (R) is true

Solution :Both (A) and (R) are true and (R) is the correct explanation of (A)
Discussion
89875.

(A) Electronegitivity of nitrogen is less than that of oxygen (R ) Nitrogen has stable P^(3) configuration where as oxygen doesnot have such a configuration

Answer»

Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A)
Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is false
Both (A) and (R ) are false

ANSWER :2
Discussion
89876.

(A) Electronegitivity of Sb and Bi are the same (R ) Ionisation enthalpy of Bi is greater than that of Sb

Answer»

Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A)
Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is false
Both (A) and (R ) are false

Answer :3
Discussion
89877.

(A) Electron withdrawing group increases w acidic nature of the carboxylic acid. (R) Phenolate ion is stabilised by resonance.

Answer»

Both (A) and (R) are TRUE and (R) is the correct explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :B
Discussion
89878.

(A) Electron gain enthalpy of fluorine is less than chlorine but fluorine is a strong oxidising agent than chlorine (R ) Fluorine has low enthalpy of dissociation and fluoride has high hydration enthalpy

Answer»

Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A)
Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is false
Both (A) and (R ) are false

ANSWER :A
Discussion
89879.

(A): Electron gain enthalpy of noble gases is very less (R): Atoms of noble gases have completely filled orbitals

Answer»

Both (A) and (R) are true and (R) is the correct EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :A
Discussion
89880.

(A): Electron affinity of fluorine is lower than that of chlorine (R): Fluorine has small and compact size and stronger inter electron repulsion than chlorine.

Answer»

Both (A) and (R ) are true and (R ) is the CORRECT EXPLANATION of (A)
Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
(A) is true but (R ) is false
Both (A) and (R ) are false

ANSWER :A
Discussion
89881.

(A) Electrical conductivity of semiconductors increases with increasing temperature. (R) With increase in temperature, large number of electrons from the valence band can jump to the conduction band

Answer»

Both (A) and (R) are true and (R) is the correct EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :A
Discussion
89882.

(A)Efficiency of the reverboratary furnace is less (R)The waste gases formed in the furnace reactions leave the furnace through chimney .

Answer»

Both A & R are TRUE, R is the CORRECT EXPLANATION of A
Both A & R are true, R is not correct explanation of A
A is true, R is FALSE
A is false, R is true

Answer :A
Discussion
89883.

(A): Efficiency of the reverberatary furnace is less (R): The waste gases formed in the fumace reactions leave the furnace through chimney.

Answer»

A and are TRUE, R explains A
A and Rare true, Reinot explain A
A is true R is FALSE
A is false R is true

Answer :A
Discussion
89884.

(A) E.C of Pd is [Kr] 4d^(8)5s^(2) (R) Palladium contains 8e^(-) in N shell.

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Solution :Both (A) and (R) are false
Discussion
89885.

A, E, M and n represent atomic weight, equivalent weight, molecular weight and valency of an element. The correct relation is

Answer»

`A=Exxn`
`A=M//E`
`A=M//n`
`M=Axxn`

ANSWER :A
Discussion
89886.

(A) E^(@) for Mn^(+3)//Mn^(+2) is more positive than Cr^(3+)//Cr^(+2) (R) IP_(3) of Mn is larger than that of Cr.

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Solution :Both (A) and (R) are true and (R) is not the correct explanation of (A)
Discussion
89887.

A , E, M , and n are the atomic weight equivalent weight ,molecular weight and valence of an element . The correct relation is :

Answer»

`A = E XX N`
A = M/E
A = M/n
M = `A xx n`

ANSWER :A
Discussion
89888.

A dye, phenolphtnalein is prepared by reacting phenol with phthalic anhydride in acidic medium. It give pnik colour in alkaline medium due to extended conjugation in a new complex formed (phthalein-dye test) identify the complex A:

Answer»




None

Answer :B
Discussion
89889.

(A) : During vacancy defect the density of solid decreases (R): The vacancies in the lattice lower the density of solid

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :A
Discussion
89890.

(a) Duringroastingmost ofthe metalsare convertedinto theirrespective oxideswhicharethen reducedto thecorrespondingmetals byusingsuitablereducingagents. However,it has beenseenthatinsomecases,insteadofthe metal oxide,it isthemetalwhich is isolated. Readtheabovepassageandanswerthe followingquestions : (i) Nametwometalsulphideswhich areconvertedintothecorrespondingmetalsduring roasting. When does ithappen so ?(ii) Name twometalsulphideswhich getconvertedintothecorrespondingmetalsduring roasting. Whendoes it happen so ? (b) What isa flux ? Whatistherole ofa fluxin teh metallurgyof ironandcopper ? (c ) Howiswroughtiron different from steel ?

Answer»

Solution : (a) (i) Metalswhoseoxidesare morestablethantheirsulphides, GET OXIDISEDTO thecorrespondingmetaloxidesduringroasting.Forexample,
`2 ZnS(s)+3 O_ 2 (g)TO2 ZnO(s)+2 SO_ 2 (g) `
`2 PbS (s)+3 O_2(g)to2 PbO(s)+2 SO_2 (g) `
(ii) Metalswhoseoxides are unstabletowardsheat,directlygetconvertedto thecorrespondingmetalsduringroasting. Alternatively,duringroasting, apartofthesesulphidesare firstoxidisedto theirrespective oxideswhich furtherreactwithmoreofthesulphideoretoyieldthe metal. Forexample,
` HgS(s)+O_ 2(g)toH g (l) +SO_2 (g) `
Alternatively,
`2 HgS(s)+2 SO_2 (g) `
`2 HGO (s)+HgS (l) to3 Hg(l) +SO_2 (g ) `
and` 2 Cu_2 S(s)+ 3O_ 2 (g) to2 Cu_ 2 O(s)+2 SO_ 2 (g) `
`2 Cu_2O (s)+ Cu_2S (s) to6 CU (l)+ SO_ 2 (g) `
Discussion
89891.

(A) During beta-decay, a new element with atomic number greater than one is obtained. (R ) Protons and neutrons keep on changing into one another through meson.

Answer»

If both (A) and (R ) are CORRECT and (R ) is the correct EXPLANATION for (A).
If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )
If both (A) and (R ) are incorrect.
If both (A) and (R ) are incorrect.

Answer :B
Discussion
89892.

(A) During leaching of Al from bauxite seeding agentfreshlyprepared hydrated Al_(2) O_(3) is added (R) Seeding agentinduces precipitation of Al_(2) O_(3),x H_(2) O

Answer»

Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct EXPLANATIONOF (A)
(A) is true but (R) is false
Both (A) and (R) are false

ANSWER :A
Discussion
89893.

(A) During acid catalysed esterification, oxygen atom of alcohol is present in ester molecule(R) Alcohol acts as a nucleophile

Answer»

Both (A) and (R) are TRUE and (R) is the correct explanation of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is FALSE
Both (A) and (R) are false

Answer :A
Discussion
89894.

A: Durability of a polymer is not altogether an advantage. R: The enormous increase in the use of thrown away the packaging material poses a serious waste disposal problem.

Answer»

If both Assertion & REASON are true and the reason is the correct EXPLANATION of the assertion, then mark 1.
If both Assertion& Reason are true but the reason is not the correct explanation of the assertion, then mark 2.
If Assertion is true statement but Reason isfalse, then mark3.
If both Assertion and Reason are FALSE statements the mark 4.

Answer :A
Discussion
89895.

A dsorption of a gas on the surface of solid is generally accompanied by decrease in entropy. Still it is a spontaneous process. Explain.

Answer»

Solution :Adsorption is an EXOTHERMIC PROCESS, i.e., energy factor favfours the process. As `DELTAG=DeltaH-Delta S,` in adsorption, though `DeltaS` is -ve but `DeltaH` is also-ve and `DeltaH gt T DeltaS` in magnitude so that `DeltaG` is ve. Hence, the process is SPONTANEOUS.
Discussion
89896.

A: Due to ortho effect basic nature of aniline decreases. R: It is due to steric hinderance because of solvation of cation.

Answer»

If both Assertion & Reason are true and the reason is the CORRECT EXPLANATION of the assertion, then MARK (1).
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
If Assertion is true STATEMENT but Reason is false, then mark (3)
If both Assertion and Reason are false statements, then mark (4)

Answer :1
Discussion
89897.

A ("dry")/("distil") acetone + calcium carbonate. Identify A.

Answer»

SOLUTION :CALCIUM ACETATE or calcium ethanoate or
Discussion
89898.

A dry air is passed through a soution which contains 10 g of a solute dissoved in 90 g of water. Then the same air is passed through pure water. The depression in weight of the solution is by 2.5 g and in weight of pure solvent (i.e. water) is 0.05 g. The molar mass of the solute is :

Answer»

25
50
100
180

Solution :According to Raoult's Law
`(P_(A)^(@)-P_(S))/P_(S)=("Lowring in WEIGHT of SOLVENT")/("Lowring in weight of solution")=((0.05g))/((2.5g))`
According to Raoult's Law
`(P_(A)^(@)-P_(S))/P_(S)=n_(B)/n_(A)=W_(B)/M_(B)xxM_(A)/W_(A)`
`((0.05))/((2.5))=((10g))/((M_(2)))xx((18G mol^(-1)))/((90g))`
`M_(2)=((10g)xx(18gmol^(-1))xx2.5)/((0.05)xx(90g))=100 g mol^(-1)`
Discussion
89899.

A drug which prevents pregnancy is termed _______

Answer»


ANSWER :ANTIFERTILITY DRUG
Discussion
89900.

A drug which is effective in curing malaria is

Answer»

ASPIRIN
QUININE
morphine
analgin .

SOLUTION :Chloroquine is an effective antimalarial drug .
Discussion