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20801.

Which one is a monomer of teflon ?

Answer»

`CH_(2) = C- CH = CH_(2)`
`CH_(2) = CH – CN`
`CF_(2) = CF_(2)`
`CH_(2) = CH – CI`

SOLUTION :`CF_(2) = CF_(2)`
Discussion
20802.

Which of the following is the correct relationship?

Answer»

I & II are funtional isomers.
II & IV are metamers.
I & IV are position isomers.
I & III are CHAIN isomers.

Solution :I & IV have diffenent functional GROUP. i.e. `1^(@)` and `2^(@)` AMINE therefore these are functional isomers.
Discussion
20803.

Which carbohydrate is as important as steel and is employed in manufacture of many articles in daily use as well as most abundant in nature:

Answer»

Cellulose
Glucose
Starch
Sucrose

Answer :A
Discussion
20804.

Which of the following will react fastest with Ag^(+) ?

Answer»




ANSWER :C
Discussion
20805.

Which is the strongest oxidising agent among CIO_(4)^(-),BrO_(4)^(-)and IO_(3)^(-)

Answer»

SOLUTION :`BrO_(4)^(-)`
Discussion
20806.

What is the value of ((n+l+m)/2) for all possible orbitals with number of radial nodes = 1 and where n le 3.

Answer»


ANSWER :7
Discussion
20807.

Which of the following compounds can form a zwitterion?

Answer»

Aniline
Acetanilide
Benzoic acid
Glycine

Solution :In aqueous solution, amino acids FORM zwitterion:
The CARBOXYL GROUP can lose a proton and amine group can accept a proton, GIVING rise to dipoler ion KNOWN as zwitterion.
Discussion
20808.

Which of the following reactions can evolve PH_3

Answer»

white `P + NaOH rarr`
`AlP + H_(2)O rarr `
`H_(3) PO_(4) OVERSET(Delta)rarr `
`PH_(4)I +NaOH rarr `

Solution :(a) `P_(4) +3NaOH +3H_2O rarr 3NaH_2PO_2+ul(PH)_3`
(B) `AlP +3H_(2)O rarr Al(OH)_3+ul(PH)_3`
(c) `2H_3PO_4 rarr 3H_2O+P_(2)O_5`
(d) `PH_(4)I +NaOH rarr NaI+H_(2)O+ul(PH)_3`
Discussion
20809.

Which alkali metal carbonate decompose on heating to liberate CO_(2) gas

Answer»

`Li_(2)CO_(3)`
`CaCO_(3)`
`Na_(2)CO_(3)`
`Al_(2)CO_(3)`

Solution :Among ALKALI metal carbonates only `Li_(2)CO_(3)` DECOMPOSES.
`Li_(2)CO_(3) overset(Delta)to Li_(2)O+CO_(2) UARR`
Discussion
20810.

Which structure for XeO_3 and XeF_4 are consistent with the VSEPR model

Answer»

`XeO_(3)`, trigonal pyramidal , `XeF_(4)`, square planar
`XeO_(3)`, trigonal planar, `XeF_(4)` square planar
`XeO_(3)` trigonal pyramidal , `XeF_(4)` tetrahedral
`XeO_(3)`, trigonal planar , `XeF_(4)` tetrahedral

SOLUTION :`XeO_(3), 3 sigma` bond and 1 lone pair, `sp^(3)` hybridisationshape trigonal pyramidal tetrahedral with one corner unccupied `XeF_(4), 4 sigma` bonds, 2 lone pair , `sp^(3)d^(2)` HYBRIDISATION SHAPE square planar.
Discussion
20811.

When ethylene is bubbled through an aqueoussolutionof brominecontainingsodium chloride. Theproductsformedis // are :

Answer»

1,2 - DIBROMOETHANE
2-Bromo -1- CHLOROETHANE
2- Bromoethanol
All the abovethree

ANSWER :D
Discussion
20812.

Which of the following would be the best synthesis of 2, 2- dimethypropanoic acid?

Answer»




ANSWER :C
Discussion
20813.

Which of the following is halogen exchange reaction?

Answer»

`RX+Nal to R-l+NaX`

`R-OH+HX OVERSET(ZnCl_(2))to R-X+H_(2)O`

ANSWER :A
Discussion
20814.

What is the reagent used for testing fluoride ion in water

Answer»

Alizarin-S
Quinalizarin
Phenolphthalein
Benzene

Answer :A
Discussion
20815.

Which of the following is a pseudo halide?

Answer»

`Cl^(-)`
`CN^(-)`
`IC l_(2)^(-)`
`IC L.`

Answer :B
Discussion
20816.

Which of the following it the most stable acid ?

Answer»

`CH_(2)(F) COOH` <BR>`CH_(2)(Br) COOH`
`CH_(2)(Cl) COOH`
`CH_(2)(I) COOH`

Solution :Electron withdrawing GROUPS or atoms increase the strength of acid. More the elec TRON withdrawing power, more the strength of acid.
In halogens electron withdrawing power is ,
` F gt Cl gt Br Gt I`.
Hence, `CH_(2)ICOOH` is stable acid.
Discussion
20817.

Which off the following doesn't give a ppt. with silver nitrate solution

Answer»

ETHYL bromide<BR>Sodium bromide
Calcium chloride
Sodium chloride

Solution :It doesn't provide free `Br^(-)` ions to REACT with `AgNO_(3)`.
Discussion
20818.

Which of the following represents total kinetic energy of one mole of gas?

Answer»

<P>`1//2RT`
`3//2 RT`
`(C_(P)-C_(V))RT`
`2//3 RT`

Solution :`K.E. = (3)/(2) nRT , K.E. = (3)/(2) RT`
When `n=1`.
Discussion
20819.

Which of the following is equal to 1 kgm^(-1) s^(-1)?

Answer»

0.01 poise
0.001 poise
1 poise
10 poise

Answer :D
Discussion
20820.

Which of the following resembles water in the liquid state, where it is a solvent for many electrolytes, and even undergoes autoionization as water does ?

Answer»

`N_(2)`
`Cl_(2)`
`NH_(3)`
`N_(2)O`

ANSWER :C
Discussion
20821.

Which of the following is an anaesthetic :

Answer»

ETHER
Thiobarburates
Trichloromethane
All are correct

Answer :D
Discussion
20822.

When ethene is heated at 400^@ C Under high pressure, the product is are

Answer»

Carbon and `H_2`
Polyethylene
Acetylene and `H_2`
NONE of these

Solution :`UNDERSET"(ETHYLENE)"(n(CH_2=CH_2))underset"high PRESSURE"overset(400^@C)to underset"(polyethyl ENE)"((-CH_2-CH_2-)_n)`
Discussion
20823.

Which one of the following does not involved coagulation ?

Answer»

FORMATION of delta regions
PEPTIZATION
Treatment of drinking water by potash ALUM
Clotting of blood by the use of ferric chloride

Solution :Peptization is the breaking of the particles of FRESHLY preecipitate SUBSTANCE into colloidal particles.
Discussion
20824.

Which of the following will show increase in weight when kept in magnetic field

Answer»

`TiO_(2)`
`Fe_(2)(SO_(4))_(3)`
`KMnO_(4)`
`ScCl_(3)`

Solution :`Fe^(+3)-3d^(5)-5` ELECTRONS unpaired.
Fe willl be ATTRACTED in magnetic field so will show increase in weight.
Discussion
20825.

Which of the following vitamins is the vitamin of alicyclic series?

Answer»

VITAMIN C
Vitamin K
Vitamin B
Vitamin A

Answer :A::D
Discussion
20826.

Which statement about enzymes is not correct ?

Answer»

ENZYMES are in COLLOIDAL state
Enzymes are catalysts
Enzymes can CATALYZE any reaction
Urease is an enzyme

Answer :C
Discussion
20827.

Which one of the following will most readily be dehydrated in acidic condition ?

Answer»





SOLUTION :Dehydration of alcohol is BEST upon the STABILITY of carbonium ion of alcohol which are obtained after elimination of `OH^(_)` ion. Stability ORDER `t - gt - gt p-`carbonium ion. The stability of carbonium ion is also increased by means of electron donating group. As an electron withdrawing group next to the carbon from where the HYDROGEN is lost makes the carbonium ion more stable.
Discussion
20828.

What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?

Answer»

`4molL^(-1)`
`20molL^(-1)`
`0.2molL^(-1)`
`2molL^(-1)`

SOLUTION :`"Molarity"=("Moles of the solute")/("VOLUME of solution in L")=(5.85//58.5)/(0.500L)="0.2 MOL L"^(-1)`.
Discussion
20829.

Which of the following is used as a preservative of food ?

Answer»

SODIUM sulphate
Saccharin
SUCROLOSE
Sodium metabisulphite

ANSWER :D
Discussion
20830.

Which chloride is explosive:

Answer»

`PCl_3`
`AsCl_3`
`NCl_3`
`SbCl_3`

ANSWER :C
Discussion
20831.

Which one of the following noble gases has an unusual property of diffusing through the materials such as rubber, glass or plastic?

Answer»

He
Ne
Kr
Ar

Answer :A
Discussion
20832.

What is glycosidic linkage ?

Answer»

SOLUTION :A LINKAGE between two monosaccharide UNITS through oxygen is CALLED glycosidic linkage.
Discussion
20833.

underset(("Hydrated salt"))((A)) underset("heated")overset("Storngly")tounderset("glassy bead")underset("transparent")ubrace(B+C) H_(3)BO_(3) underset("heated")overset("Strongly")toC+D Identify C-

Answer»

`(BN)_(X)`
`NaPO_(3)`
`B_(2)O_(3)`
`Mg(NH_(4))PO_(4)`

ANSWER :C
Discussion
20834.

Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile.

Answer»

Solution :(i) Propanal ACTS as NUCLEOPHILE as well as ELECTROPHILE.
`underset("(Electrophile)")underset("Propanal")(CH_(3)CH_(2)CHO)+underset("(Nucleophile)")underset("Propanal")(CH_(3)CH_(2)CHO)rarr underset("3-Hydroxy-2-methylpental")(overset(5)CH_(3)overset(4)CH_(2)overset(OH)overset("|3")"CH"-overset(CH_(3))overset("|2")"CH"-overset(1)CHO)`
(ii) Propanal acts as electrophile and BUTANAL as nucleophile.
`underset("Electrophile)")underset("Propanal")(CH_(3)CH_(2)CHO)+underset("(Nucleophile)")underset("Butanal")(CH_(3)CH_(2)CH_(2)CHO)rarr underset("2- Ethyl -3- hydroxypentanal")(overset(5)CH_(3)overset(4)CH_(2)-overset(OH)overset("3|")"CH"-overset(CH_(2)CH_(3))overset("2|")"CH"overset(1)CHO)`
(iii) Butanal acts as electrophile and propanal as nucleophile.
`underset("(Electrophile)")underset("Butanal")(CH_(3)CH_(2)CH_(2)HO)+underset("(Nucleophile)")underset("Propanal")(CH_(3)CH_(2)CHO)rarr underset("3 - Hydroxy - methyhexanal")(overset(6)CH_(3)overset(5)CH_(2)overset(4)CH_(2)-overset(OH)overset("3|")"CH"-overset(CH_(3))overset("2|")"CH"-overset(1)CHO)`
(iv) `underset("(Electrophile)")underset("Butanal")(CH_(3)CH_(2)CH_(2)CHO)+underset("(Nucleophile)")underset("Butanal")(CH_(3)CH_(2)CH_(2)CHO)rarr underset("2 - Ethyl-2- hydroxyhexanal")(overset(6)CH_(3)overset(5)CH_(2)overset(4)CH_(2)-overset(OH)overset("3|")"CH"-overset(CH_(2)CH_(3))overset("2|")"CH"overset(1)CHO)`
Discussion
20835.

Whichof the followingreagentis usedto convert-CN group to -CH_(2)NH_(2)group ?

Answer»

`CrO_(3)`
`Na+C_(2)H_(5)OH`
`H_(3)PO_(4)`
`Al_(2)O_(3)`

Answer :B
Discussion
20836.

Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.

Answer»

<P>

Solution :Mass of glucose, `w_(2)=25g`
Mass of water, `w_(1)=450 g`
We know that,
Molar mass of glucose `(C_(6)H_(12)O_(6))`
`M_(2)=6xx12+12xx1+6xx16`
`= 180 g MOL^(-1)`
Molar mass of water `M_(1)=18 g mol^(-1)`
Then, number of moles of glucose,
`n_(2)=(25)/(180 g mol^(-1))=0.139` mol
And, number of moles of water,
`n_(2)=(450)/(18 g mol^(-1))=25 mol`
We know that,
`(p_(1)^(0)-p_(1))/(p_(1)^(0))=(n_(1))/(n_(2)+n_(1))`
`(17.535-p_(1))/(17.535)=(0.139)/(0.139+25)`
`17.535-p_(1)=(0.139xx17.535)/(25.139)=0.00552`
`17.535-p_(1)=0.087`
`p_(1)=17.44` MM of Hg
Hence, the vapour pressure of water is 17.44 mm of Hg.
Discussion
20837.

Which is NOT a hard metal?

Answer»

Cr
Cd
Mo
W

Answer :B
Discussion
20838.

Which among the following is not having an asymmetric carbon atom ?

Answer»

2-chloro butane
2-bromo-3-butene
2-hydroxy propanal
isobutyric acid

Solution :`CH_(3)-OVERSET(CH_(3))overset("|")"CH"-COOH`
Discussion
20839.

What is acylation? Give example.

Answer»

SOLUTION :Most of amines REACT with acid chlorides, ANHYDRIDES and ESTERS by nucleophillic SUBSTITUTION reaction. This reaction is known as acylation.
Ex: (i) `C_(2)H_(5)NH_(2)+CHCOCl""tounderset("N-Ethylethanamide")(C_(2)H_(6)NH-CO-CH_(3))`
(ii) `C_(6)H_(5)NH_(2)+(CH_(3)CO)_(2)tounderset("N-Phenylethanamide")(C_(6)H_(5)NHCOCH_(3))+CH_(3)COOH`
Discussion
20840.

Which of the following sets of quantum numbers represents an impossible arrangement?

Answer»

`{:(n""l""m""s),(3""2""-2""+1//2):}`
`{:(n""l""m""s),(4""0""0""-1//2):}`
`{:(n""l""m""s),(5""2""0""+1//2):}`
`{:(n""l""m""s),(3""3""+2""+1//2):}`

Solution :For n=3, l cannot have VALUE EQUAL to 3.
Discussion
20841.

The two compounds sulphato penta-ammine cobalt(III) bromide and sulphato penta-ammine cobalt(III) chloride represent:

Answer»

LINKAGE isomerism
Ionisation isomerism
Co-ordination isomerism
No isomerism

Answer :D
Discussion
20842.

Two solutions A and B are separated by semi-permeable membrane. If liquid flows A to B then

Answer»

A is less CONCENTRATED than B
A is more concentrated than B
Both have same concentration
None of these

Solution :OSMOSIS occur from DILUTE solution to concentrate solution. THEREFORE solution A is less concentrated than B.
Discussion
20843.

Write the name of an adsorbent for easily liquefiable gases.

Answer»

SOLUTION :ACTIVATED CHARCOAL
Discussion
20844.

When an electric current is passed through an aqueous solution of sodium chloride

Answer»

`H_(2)` is evolved at the anode
OXYGEN is evolved at the cathode
its pH progressively decreases
its pH progressively increases

Solution :During ELECTROLYSIS of `NACL (aq) , H^(+)` ions are DISCHARGED at cathode and the pH of solution increases due to decrease in `[H^(+)]` .
Discussion
20845.

Which transition metal cation has maximum unpaired electrons ?

Answer»

`Mn^(2+)`
`NI^(2+)`
`CO^(2+)`
`FE^(2+)`

ANSWER :A
Discussion
20846.

Which of the following reagent cannot be used to oxidize primary alcohols to aldehydes ?

Answer»

`CrO_3`in ANHYDROUS medium.
`KMnO_4`in acidic medium
PYRIDINIUM chlorochromate.
Heat in the PRESENCE of CU at 573K.

Answer :B
Discussion
20847.

underset(("Hydrated salt"))((A)) underset("heated")overset("Storngly")tounderset("glassy bead")underset("transparent")ubrace(B+C) H_(3)BO_(3) underset("heated")overset("Strongly")toC+D How many X–O–X linkages are present in structure of A (X = central atom)-

Answer»

4
3
5
2

Answer :C
Discussion
20848.

The salt A is

Answer»

`PbBr_(2)`
`Pb(NO_(3))_(2)`
`AgNO_(3)`
`Hg_(2)(NO_(3))_(2)`

SOLUTION :SALT(A) is `Pb(NO_(3))_(2)`
Discussion
20849.

underset(("Hydrated salt"))((A)) underset("heated")overset("Storngly")tounderset("glassy bead")underset("transparent")ubrace(B+C) H_(3)BO_(3) underset("heated")overset("Strongly")toC+D Find the number of tetrahedral and trigonal planar units in structure of A -

Answer»

2,1
2,2
2,4
5,2

ANSWER :B
Discussion
20850.

Which of the following compounds can not show tautomerism?

Answer»

`HO-CH=CH_(2)`


ANSWER :C
Discussion