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21201.

The weight of chlorine that would be deposited from molten NaCl in one minute by current of 300 milliamperes is

Answer»

`1.123 xx 10^(20)`
`6.621 xx 10^(-3)`
`2.216 xx 10^(20)`
`5.6 xx 10^(19)`

Solution :Weight of chlorine deposited may be calculated ACCORDING to FARADAY's first law of electrolysis .
`W = (ixx t xx E)/(96500)therefore t = 300 m A = 300 xx 10^(-3) A`
`= (300 xx 10^(-3) xx 60 xx 35.5)/(96500) ` (t = 1 min = 60 SEC)
`= 6.621 xx 10^(-3)` GMS (E of Cl = `("At. mass")/(1) = 35.5)`
Discussion
21202.

Which one of the following reactions is most suitable for the preparation of n-propyl benzene

Answer»

Friedel-Craft's reaction
Wurtz reaction
Wurtz -FITTING reaction
Gringnard reaction

Solution :
Discussion
21203.

Which of the followingstatementis correctfor 3d-transitionelement ?

Answer»

AllmetalexceptZn andSc from MOoxide
Allmetalsexcept ScformsMOOxide
All metalexceptZn formMOOxide
AllmetalsexceptMn formMOOxide .

ANSWER :B
Discussion
21204.

What is meant by denaturation of protein ? Which level of structure remains intact during denaturation of globular protein ?

Answer»

SOLUTION :(i). Primary and `2^(@)` structure rerrains INTACT during denaturation of GLOBULAR PROTEINS
Discussion
21205.

Which of the following reaction cannot be used for the preparation of alkane?

Answer»

Corey-House synthesis
Frankland reaction
Clemmenson's reduction
Aromatization

Answer :4
Discussion
21206.

The rms speed of hydrogen is sqrt7 times the rms speed of nitrogen. If T is the temperature of the gas, then :

Answer»

`T(H_2) = T(N_2)`
`T(H_2) GT T(N_2)`
`T(H_2) LT T(N_2)`
`T(H_2) = SQRT 7 T(N_2)`

Answer :C
Discussion
21207.

Which of the following is/are bidentate chelating ligand ?

Answer»

`[NH_(3)CH_(2)CH_(2)NH_(3)]^(2+)`
`NH(CH_(2)CO_(2)^(-))_(2)`
`H_(2)N-CH_(2)-UNDERSET(O)underset(||)C-O`

Answer :C::D
Discussion
21208.

Two Faraday of electricity is passed through a solution of CuSO_(4) . The mass of copper deposited at the cathode is : (at mass of Cu = 63.5 amu)

Answer»

2 G
127 g
0 g
63.5 g

Answer :D
Discussion
21209.

Which pair of the gaseous species diffuses through a small jet with the same rate of diffusion at same P and T ?

Answer»

NO and CO
NO and `CO_(2)`
`NH_(3)` and `PH_(3)`
NO and `C_(2) H_(6)`

ANSWER :D
Discussion
21210.

Which of the following option is correct?

Answer»




SOLUTION :
Discussion
21211.

The role of a catalyst is to change……

Answer»

GIBBS energy of REACTION
enthalpy of reaction
ACTIVATION energy of reaction
equilibrium constant

Solution :The chemical reaction occurs in PRESENCE of catalyst.So activation energy barrier is lowered.
Discussion
21212.

Write the IUPAC name of compound: CH_(3)-overset(O)overset(||)(C)-CH=overset(CH_(3))overset(|)(C)-CH_(3)

Answer»

SOLUTION :4-Methyl pent-3-ene-2-one
Discussion
21213.

Two liquids kX and Y on mixing form an ideal solution. The vepour pressure of the solution containing 3 moles X and 1 mole of Y is 550 mm Hg. But when 4 moles of X and I mole of Y and pure Y at this temperature?

Answer»

SOLUTION :Let the vapourpressures of pure LIQUIDS X and Y be `P_(X)^(@) and P_(Y)^(@)` respecively Mole Fraction of `X=n_(x)/(n_(x)+n_(y))=3/(3+1)=3/4=0.75`
Mole fraction of Y=`n_(Y)/(n_(x)+n_(y))=1/(3+1)=1/4=0.25`
According to Raooult's Law ,
`P_(x)^(2)xx0.75+P_(Y)^(@)xx0.25=550 mm`
Mole fraction of X=`n_(x)/(n_(x)+n_(y))=4/(4+1)=4/5=0.8`
Mole fraction of Y=`n_(y)/(n_(x)+n_(y))=4/(4+1)=1/5=0.2`
According to Roult's Law
`P_(X)^(@)xx0.8+P_(Y)^(@)xx0.2=560 mm`
Multiply EQUATION (i) by 4 and equation(ii) by 5
`3P_(X)^(@)+P_(Y)^(@)=550xx4=2200 mm`
`4P_(X)^(@)+P_(Y)^(@)=560xx5=2800 mm`
`-P_(X)^(@)=(2200-2800)-600mm`
`P_(X)^(@)=600 mm`
Substitute the value of `P_(X)^(@)` in equation
`3xx(600mm)+P_(Y)^(@)=2200mm or P_(Y)^(@)=2200-1800=400mm`
Discussion
21214.

Whatare theuses ofcellulose ?

Answer»

SOLUTION :(i) Celluloseis used extensivelyin manufacturingpaper ,cellulosefibers andrayonexplosive .
(ii) GUNCOTTON - NITRATED esterof cellulosean explosiveis prepared fromcellulose .
(iii) Celluloseactas foodfor ANIMALS .
Discussion
21215.

Which one of the following is double salt?

Answer»

POTASH alum
Potassium sulphate
Aluminium Sulphate
Ammonium sulphate

Answer :A
Discussion
21216.

Write IUPAC names of the following: (i) HOOC-CH_2-underset(CH_2)underset(|)C=CHCOOH

Answer»

Solution :(i) 3 - Methylpent - 2 - ene - 1,5 - dioic acid
(ii) 6-Bromo-3-hydroxy-5-nitrobenzoic acid
Discussion
21217.

Which of the following are amino acid hormones

Answer»

1,3
1,2
2,3
Only 1

Answer :B
Discussion
21218.

Write the structure of eight isomeric amines with the formula C_(14)H_(11)N.

Answer»

Solution :Out of eight isomeric amines with the formula `C_(4)H_(11)N`, four are primary, three are secondary and one is tertiary amine.
(i) `CH_(3)CH_(2)CH_(2)CH_(2)NH_(2)`, (II) `CH_(3)UNDERSET(underset(NH_(2))(|))(C )HCH_(2)CH_(3)`, (iii) `CH_(3) - underset(underset(CH_(3))(|))(CH)-CH_(2)NH_(2)`, (iv) `(CH_(3))_(3)C-NH_(2)`, (iv) `CH_(3)NHCH_(2)CH_(2)CH_(3)`, (vi) `C_(2)H_(5)NHC_(2)H_(5)`, (vii) `CH_(3)NHCN(CH_(3))_(2)` and (viii) `CH_(3) - underset(underset(CH_(2)CH_(3))(|))(N)-CH_(3)`
Discussion
21219.

Which of the following does not show positive deviation form Raoult's law ?

Answer»

Phenol-aniline
Ethanol-acetone
Acetone-carbon DISULPHIDE
METHANOL -WATER

ANSWER :A
Discussion
21220.

Which of the following statements is/are INCORRECT :

Answer»

All spectral lines BELONGING to Balmer series in hydrogen spectrum lie in visible region
if a light of frequency V FALLS on a METAL surface having work function hv, PHOTOELECTRIC effect will take place only if `v le v_0`
The number of photoelectrons ejected from a metal surface in photoelectric effect depends upon the intensity of incident radiations.
The series limit wavelength of Balmer series for H-atom is `4/R`, where R is Rydberg's constant.

Solution :(A)Only first four spectral lines belonging to Balmer series in hydrogen spectrum lie in visible region.
(B) If a light of frequency v falls on a metal surface having work functional hv, photoelectric effect will take place only if `vgev_0`,since `v_0` is the minimum frequency required for photoelectric effect.
Discussion
21221.

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400 K ?(R = 8.314 JK^(-1)mol^(-1))

Answer»

`234.65 kJ mol^(-1) K^(-1)`
`434.65 kJ mol^(-1) K^(-1)`
`434.65 J mol^(-1) K^(-1)`
`334.65 J mol^(-1) K^(-1)`

Solution :`T_(1) = 200K, k = k_(1) , T_(2) = 400K, k= k_(2) = 2k_(1)`
log `((k_(2))/(k_(1))) = (2.303 E_(a))/(R ) ((T_(2) - T_(1))/(T_(1) T_(2)))`
`log ((2k_(2))/(k_(1))) = (2.303 E_(a))/(8.314J K^(-1) mol^(-1)) ((400K - 200K)/(200 K xx 400 K))`
`E_(a) = (0.3010 xx 8.314J mol^(-1) xx 200 xx 400)/(2.303 xx 200)`
`E_(a) = 434.65 J mol^(-1)`
Discussion
21222.

The transition of electron in hydrongen atom having minimum wavelength is :

Answer»

`n_(3)ton_(2)`
`n_(4)ton_(3)`
`n_(5)ton_(4)`
All have the same wavelength

Solution :`E_(3()-E_(2)`for Ho atom (first LINE in BALMER series)
`-=(E_(1(H)))/9+(E_(1(H)))/4=(4e_((1H)))/36`
`E_(6)-E_(4)`for `He^(+)=-(E_(1(H))xx2^(2))/(6^(2))+(E_(1(H))xx2^(2))/16`
`((-4)/36+1/4)E_(1(H))=(5E_((1H)))/36`
Discussion
21223.

The reagent that gives an orange coloured precipitate with acetaldehyde is

Answer»

`NH_2OH`
`NaHSO_3`
Iodine
2,4 - DNP

Answer :D
Discussion
21224.

Write short notes on the following (b) Brownian Movement

Answer»

SOLUTION :(B) Brownian Movement : Zig-zag MOTION of colloidal PARTICLES.
Discussion
21225.

Which of the following has largest number of atoms ?

Answer»

`6.02 xx 10^(23)` molecules of `NH_(3)`
32 grams of `O_(2)`
100 g of `CaCO_(3)`
127 g of IODINE .

ANSWER :C
Discussion
21226.

The value of Delta_(0) " for " [Ti(H_(2)O)_(6)]^(3+) is found to be 240 kJ mol^(-1) then predict the colour of the complex using the followingtable . (h=6xx10^(-34)J-sec,N_(A)=6xx10^(23)c=3xx10^(8) m//sec)

Answer»


ANSWER :YELLOW COLOUR
Discussion
21227.

Which catalyst is used to prepare Nitrile rubber ?

Answer»

ZIEGLER Natta
Acid - BASE
Peroxide
Alkyl mercaptan

SOLUTION :Peroxide
Discussion
21228.

The stereochemical relation between two compounds (A) and (B) is ……

Answer»

IDENTICAL
Diastereomers
ENANTIOMERS
CONSTITUTIONAL ISOMERS

Solution :
Discussion
21229.

What happens when formaldehyde reacts with ammonia ?

Answer»

SOLUTION :HEXAMETHYLENE ietramine `(CH_2)_6N_4`
Discussion
21230.

Which oxide has three dimensional structure?

Answer»

CO
`CO_2`
`SiO_2`
`SO_2`

ANSWER :C
Discussion
21231.

Which of the following statement (s) is (Are) correct with reference to ferrous and ferric ions ?

Answer»

`Fe^(3+)` gives BROWN COLOUR with POTASSIUM ferricyanide.
`Fe^(2+)` gives blue colour precipitate with potassium ferricyanide.
`Fe^(3+)` gives BLACK precipitate with potassium thiocynate.
`Fe^(2+)` gives brown colour with ammonium THIOCYANATE.

Answer :B
Discussion
21232.

Which of the following solutions have PH close to 1.0 ?

Answer»

100 ML of M/10 HCl + 100 ml of M/10 NaoH
55 ml of M/10 HCl + 45 ml of N/10 NaoH
10 ml of M/10 HCL + 90 ml of M/10 NaoH
75 ml of M/10 HCl + 25 ml of M/5 NaoH

Answer :D
Discussion
21233.

Which compound is known as oil o winter green

Answer»

PHENYL benzoate
phenyl salicylate
Phenyl acetate
Methyl salicylate

Answer :D
Discussion
21234.

Which of the following aqueous solutions should have the highest boiling point ?

Answer»

1.0 M NaOH
`1.0 M Na_(2)SO_(4)`
`1.0 M NH_(4)NO_(3)`
`1.0M KNO_(3)`

Solution :Explanation : In 1.0 M `Na_(2)SO_(4)` solution vant Hoff factor, `i gt 1` and is maximum hen compared with the other three glven electrolytes. So, the extent of dissociation in case of 1.0 M `Na_(2)SO_(4)` would be highest yielding maximum no. of ions as compared to the other GIVEN electrolytes in their 1.0 M SOLUTIONS.
Discussion
21235.

Which of the following statements is false in case of ethoxy ethane ?

Answer»

It is inflammable
It is SIMPLE ether
It REACT with NA metal
It is USED as anaesthetic

Answer :C
Discussion
21236.

Which of the following base is not present in DNA ?

Answer»

Thymine
Quinoline
Adenine
Cytosine

Solution :DNA CONTAINS adenine (A), thymine (T), GUANINE (G) and cytosine (C) bases.
Discussion
21237.

Write the IUPAC names of the following: (i)CH_(3)CH-(CH_(3))-CHO (ii)_(6)H_(5)-CH_(2)-CHO (iii)

Answer»

Solution :`UNDERSET("2-Methyl propanol")underset(CH_(3)) underset(|)(CH_(3)-CH-CHO)`
(II) `underset("2-Phenoylethanal")(C_(6)H_(5)-CH_(2)-CHO)`
(iii) 2-Methyphenol
Discussion
21238.

Which one of the following pairs of isomers and types of isomerism are CORRECTLY matched ?

Answer»

`[Co(NH_(3))_(5)(NO_(2))]Cl_(2) and [Co(NH_(3))_(5)(ONO)]Cl_(2)`…. LINKAGE
`[Cu(NH_(3))_(4)][(PtCl_(4))] and [PT(NH_(3))_(4)[CuCl_(4)]`…. Coordination
`[Pt(NH_(3))_(4)Cl_(2))]Br_(2)and [Pt(NH_(3))_(4)Br_(2))Cl_(2)…….` Ionization
All of these

Answer :D
Discussion
21239.

Vapour pressure of chloroform (CHCl_(3)) and dichloromethane (CH_(2) Cl_(2)) at 298 K and 200 mm Hg and 415 mm Hg respectively (i) calculate the vapour pressure of the solution prepared by mixing 25·5 g of CHCl_(3) and 40 g ef CH_(2)Cl_(2) at 298 K and (ii) mole fraction of each component in vapour phase.

Answer»

Solution :(i) MOLAR mass of`CH_(2)Cl_(2)`
`(12 xx 1 + 1 xx 2 + 35.5 xx 2 )`
= 85 g` mol^(-1)`
Molar mass of `CHCl_(3)`
= `(12 xx 1 + 1 xx 1 + 35.5 xx 3) `
`= 119.5 g mol^(-1)`
moles of `CH_(2)Cl_(2) = (40)/(85)` = 0.47 mol
Moles of `CHCl_(3) = (25.5)/(119.5) = 0.213 ` mol
Total number of moles in the solution
=0·47 + 0·213
= 0.683 mol
`X CH_(2) Cl_(2) = ("mole of "CH_(2) Cl_(2))/("Total mole of solutions")`
`= (0.47)/(0.683) = 0.688`
`X CH_(2) Cl_(2) = (1.00 - 0.688) = 0.312`
Now we know that
` P_("total") = P_(A)^(0) + (P_(A)^(0) - P_(A)^(0) ) xx CH_(2) Cl_(2)`
`X CH_(2) Cl_(2) = 200 + (415 - 200) xx 0.688`
= 200 + 147.9
= 347.9 mm Hg
(ii) Mole fraction of component in vapour phase
`P_(A)^(0) = CHCl_(3) `
`P_(B)^(0) = CH_(2) Cl_(2)`
`P_(CH_(2)Cl_(2)) = P_(CH_(2) xx Cl_(2))^(0) xx X_(CH_(2)Cl_(2))`
= 415 `xx `0.688
= 285.5 mm Hg
`P_(CHCl_(3)) = P_(CHCl_(3))^(0) xx X_(CHCl_(3))`
= 200 `xx 0.312`
= 62.4 mm Hg
P = y `xx P_("total")`
`Y_(CH_(2)Cl_(2)) = (P_(CH_(4)Cl_(2))/(P_("total")))`
` = (285.5)/(347.9) = 0.82`
`Y_(CHCl_(3)) = (P_(CHCl_(3))/(P_("Total")))`
`= (62.4)/(347.9) = 0.18`
Discussion
21240.

Which of the following species containing mercury is most toxic

Answer»

`CH_(3) Hg
`HgCI_(2)`
`Hg_(2) CI_(2)`
`Hg ` metal

Answer :A
Discussion
21241.

What is the kinetic energy ofan electron in second excited state of He^(+)? (Energy of electron in first shell of H=-13.6eV)

Answer»

`-1.51eV`
`-6.04eV`
`-13.08eV`
`-13.06eV`

Solution :K.E. of electron in SECOND EXCITED staet (n=3 shell)of `He^(+)`
`K.E.=-E_(3)=-(E_(1))/9=-(13.6xx2^(2))/9`
`=-6.04eV`
Discussion
21242.

Which of the following is not a food preservative-

Answer»

SODIUM benzoate
sodium Sulphite
Sorbic acid
salts of PROPANOIC acid

Answer :D
Discussion
21243.

Which of the following reagent react with CH_(2)O forming urotropine ?

Answer»

`NH_(2)OH`
`NH_(3)`
`HCN `
`RMGX`

Solution :`6HCHO + 4NH_(3) to (CH_(2))_(6) N_94) + 6H_(2)O`
Discussion
21244.

Which of the following is used in purifying air of crowded places ?

Answer»

`O_2`
`O_3`
`Cl_2`
`SO_2`

ANSWER :B
Discussion
21245.

Which one of the following compounds on treatment with LiAlH_4 will give a product that will give a positive iodoform test :

Answer»

`CH_3CH_2CHO`
`CH_3CH_2COOCH_3`
`CH_3CH_2OCH_2CH_3`
`CH_3COCH_3`

ANSWER :D
Discussion
21246.

Urea when heated slowly, product formed is :

Answer»

`N_2`
`CO_2`
Biuret
Ammonium carbamate

Answer :C
Discussion
21247.

Which reaction confirms the presence of aldehyde group in glucose ?

Answer»

Formation of SCHIFF's base
Formation of Saccharic acid by OXIDATION.
Oxidation to Gluconic acid by Bromine
Formation of cyanohydrin by REACTION with HCN

SOLUTION :Oxidation to gluconic acid by bromine water.
Discussion
21248.

Which of the following will not give coloured dye with benzene diazonium chloride ?

Answer»




Solution :COLOURED dyes are formed by the COUPLING reaction between phenols and benzene diazonium chloride. Benzyl ALCOHOL does not CONTAIN phenolic group and it does form coloured DYE with diazonium salt.
Discussion
21249.

What happens when ethyl alcohol is treated with diazomethane in the presence of HBF_(4) ?

Answer»

SOLUTION :Ethy METHYL ETHER is FORMED .
Discussion
21250.

Types of drugs that mimic that natural messenger by switching on the receptor are called

Answer»

antagonists
chemical messengers
receptors
AGONISTS

ANSWER :D
Discussion