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3651.

underset(("anode"))(Zn_((s))|Zn_((aq))^(2+)||underset(("cathode"))(Cu_((aq))^(2+)|Cu_((s)) is

Answer»

Weston cell
DANIEL cell
Calomel cell
Faraday cell

Solution :The cell in which CU and Zn RODS are DIPPED in its SOLUTIONS called Daniel cell.
Discussion
3652.

Whatis 'D'in the followingreaction ? C_(2)H_(5) - NO_(2) overset(LiAIH_(4)) to A overset(C_(2)H_(5)Br)to B overset(C_(2)H_(5)Br) to C overset(H_(2)SO_(4)) to D

Answer»

`[(C_(2)H_(5))_(3) NH]_(2)^(+) SO_(4)^(2)`<BR>`[(C_(2)H_(5))_(3)NH]_(3)^(+) SO_(4)^(2)`
`(C_(2)H_(5))_(3) NH^(+) SO_(4)^(2-)`
`(C_(2)H_(5))_(3)N^(+) OH^(-)`

Solution :`C_(2)H - NO_(2) overset(LiAlH)to C_(2)H_(5) - NH_(2) UNDERSET(-HBr)overset(C_(2)H_(5)Br)to`
`(C_(2)H_(5)) - NH underset(-HBr)overset(C_(2)H_(5)Br)to (C_(2)H_(5))_(3)N overset(H_(2)SO_(4))to [(C_(2)H_(5))_(3)NH]_(2)^(+) SO_(4)^(2-)`
Discussion
3653.

Which of the following are benzylic alcohols?

Answer»

`C_(6)H_(5)-CH_(2)-CH_(2)OH`
`C_(6)H_(5)-CH_(2)OH`
`C_(6)H_(5)-underset(CH_(3))underset(|)(C)H-OH`
`C_(6)H_(5)-CH_(2)-underset(CH_(3))underset(|)(C)H-OH`

Solution :Alcohols (a) and (d) are not benzylic alcohols since thhey do not CARRY the OH GROUP on that carbon which is DIRECTLY linked to the benzene ring. Thus, OPTIONS (B) and (c) are correct.
Discussion
3654.

Write the difference between adsorption and absorption .

Answer»

Solution :ADSORPTION is SURFACE , while absorption is BULK PHENOMENON.
Discussion
3655.

The system shown in the figure is in equilibrium, where A and B are isomeric liquids and form an ideal solution at TK.standard vapour pressure of A and B are P_A^@ and P_B^@ respectively at TK.We collect the vapour of A and B in two container of volume V, first container is maintained at 2TK and second container is maintained at (3T)/2K.At the temperature greater than TK, both A and B exist in only gaseous form.Total vapour pressure of the system at TK is given as P=P_A^@X_A+P_B^@X_B where X_A and X_B are the mole fraction of A and B in a liquid mixture. In container (1) We assume that collected gases behave ideally at 2TK and there can take place isomerisation reaction in which A converted into B by first order kinetics Reaction is given as AoversetAtoB In container (II) At the given temperature (3T)/2,A and B are ideal in nature and non mixing in nature.A small pin hole is made into container.We can determine the initial rate of effusion of both gases in vaccum by the expression r=(kp)/sqrtm Where P= pressure difference between system and surrounding K=positibe constant M=Molecular weight of the gas. Vapour is collected and passed into a container of volume 8.21 lit, maintainer at 100 K and after 5 min number of mole of B=8/3.Then calculate pressure develop into the container after two half lives.

Answer»

2 ATM
4 atm
1 atm
0.5 atm

Solution :`{:(,AtoB),(t=0,8/3" "4/3),(t=5"min",4/3" "8/3):}`
Now after two HALF life
`n_A=2/3` and `n_B=10/3`
`P_T V=(n_A+n_B)RT`
`P_Txx8.21=12/3xx0.082xx100 " "implies P_T=4 "atm"`
Discussion
3656.

The system shown in the figure is in equilibrium, where A and B are isomeric liquids and form an ideal solution at TK.standard vapour pressure of A and B are P_A^@ and P_B^@ respectively at TK.We collect the vapour of A and B in two container of volume V, first container is maintained at 2TK and second container is maintained at (3T)/2K.At the temperature greater than TK, both A and B exist in only gaseous form.Total vapour pressure of the system at TK is given as P=P_A^@X_A+P_B^@X_B where X_A and X_B are the mole fraction of A and B in a liquid mixture. In container (1) We assume that collected gases behave ideally at 2TK and there can take place isomerisation reaction in which A converted into B by first order kinetics Reaction is given as AoversetAtoB In container (II) At the given temperature (3T)/2,A and B are ideal in nature and non mixing in nature.A small pin hole is made into container.We can determine the initial rate of effusion of both gases in vaccum by the expression r=(kp)/sqrtm Where P= pressure difference between system and surrounding K=positibe constant M=Molecular weight of the gas. If partial vapour pressure of A is twice that of partial vapour pressure of B and total V.P. of equal to 2 at T=50 K and V=8.21 lit, then number of mole of A and B in vapour phase is :

Answer»

`8/3 , 4/3`
3,1
2,2
1,3

Solution :`P_T=P_A+P_B=3P_B`
So, `P_B=2/3` and `P_A=2-2/3=4/3` Now `P_A/P_B=n_1/n_2=2`
So, `n_1=2n_2`
`P_T V=n_T R_T`
`2xx8.21=n_Txx0.082xx50`
`n_T=4=n_1+n_2 " " So, n_2=4/3 " " n_1=8/3`
Discussion
3657.

Which of the following is strongest acid among all?

Answer»

`HI`
`HF`
`HBR`
`HCL`

SOLUTION :`HI`
Discussion
3658.

The system shown in the figure is in equilibrium, where A and B are isomeric liquids and form an ideal solution at TK.standard vapour pressure of A and B are P_A^@ and P_B^@ respectively at TK.We collect the vapour of A and B in two container of volume V, first container is maintained at 2TK and second container is maintained at (3T)/2K.At the temperature greater than TK, both A and B exist in only gaseous form.Total vapour pressure of the system at TK is given as P=P_A^@X_A+P_B^@X_B where X_A and X_B are the mole fraction of A and B in a liquid mixture. In container (1) We assume that collected gases behave ideally at 2TK and there can take place isomerisation reaction in which A converted into B by first order kinetics Reaction is given as AoversetAtoB In container (II) At the given temperature (3T)/2,A and B are ideal in nature and non mixing in nature.A small pin hole is made into container.We can determine the initial rate of effusion of both gases in vaccum by the expression r=(kp)/sqrtm Where P= pressure difference between system and surrounding K=positibe constant M=Molecular weight of the gas. If vapour is collected in container of volume 8.21 lit maintained at 75 K then ratio of initial rate of effusion of Gas A and B is given as :

Answer»

`2:1`
`1:2`
`4:1`
`1:4`

SOLUTION :`r_A/r_B=P_A/P_Bsqrt(M_B/M_A)IMPLIES r_A/r_B=n_A/n_Bsqrt(M_B/M_A)=((8//3))/((4//3))SQRT(1/1)`
`r_A/r_B=2`
Discussion
3659.

which of the following stament is not correct?

Answer»

Pure PARA hydrogen can be OBTAINED by cooling ordinaiy hydrogen to about 20 K.
The ratio of ORTHO and para hydrogen at 300 K and above is 3 : 1.
The ratio of ortho to para hydrogen varies with temperature.
Pure ortho hydrogen can be obtained by heating ORDINARY hydrogen above 300 K.

Solution :Pure ortho hydrogen cannot be obtained by heating ordinary hydrogen.
Discussion
3660.

When aqueous sodium hydroxide was added to an aqueous solution of X, a green precipitate, insoluble in an excess of aqueous sodium hydroxide, was formed. When aqueous barium nitrate was added to a second sample of aqueous X a white precipitate was obtained. Which one of the following could be X?

Answer»

`FeCl_(2)`
`FeSO_4`
`CrCl_3`
`Cr_2(SO_4)_(3)`

ANSWER :B
Discussion
3661.

Zinc reacts with excess of caustic soda to form:-

Answer»

`ZN(OH)_(2)`
`ZNO`
`Na_(2)ZnO_(2)`
`Zn(OH)_(2)ZnCO_(2)`

Answer :C
Discussion
3662.

Write structures of different isomers corresponding to the molecular formula, C_(3)H_(9)N. Write IUPAC names of the isomers which will liberate nitrogen gas on treatment with nitrous acid.

Answer»

Solution :In all FOUR structural isomers are POSSIBLE. These are :
` 1^@` AMINE ` underset("Propan-1-amine ")(CH_3 CH_2 CH_2 NH_2) underset("Propan-2-amine ")(CH_3 - underset(NH_2)underset(|)(CH -CH_3)`
` 2^@ `Amines : ` underset("N-Methylethanamine ")(CH_3 -NH -C_2 H_5)`
`3^@`Amine : ` underset("N,N-dimethylmethanamine ")(CH_3 - overset(CH_3) overset(|)N-CH_3)`
Only `1^@`amines react with `HNO_2` to liberate `N_2` gas
` underset("Propan-1-amine ")(CH_3 CH_2 CH_2 NH_2 +HNO_2) tounderset("Propan-1-ol (major product)")(CH_3CH_2 CH_2 OH +H_2 O +N_2)`
Discussion
3663.

Which drug is used to reduce acidity ?

Answer»

ANALGESIC
ANTISEPTIC
ANTIBIOTIC
Antacid

Answer :D
Discussion
3664.

underset((aq))Co^(2+)+underset((aq))SCN^(-)to complex (a) underset((aq))Ni^(2+)+dmgoverset(NH4OH)to complex (y) The CNof Co, Ni in comp,exes (x) & (y) are four Select the correct statements for the complexes 'x' and 'y'

Answer»

‘x' in paramagnetic with two unpaired `E^(-)`
y' is diamagnetic with intermolecular H-bonding
x' is paramagnetic with 3 unpaired e" and 'y' is diamagnetic
x' and 'y' both are diamagnetic

Solution :`[Co(SCN)_(4)]^(2-)` is paramagnetic.
Discussion
3665.

To detect bombs that may be smuggled into airplanes , the Federal Aviation Administration (FAA) will soon require all major airports in the United States to install thermal neutrons analysers . The thermal neutron analyser will bombared baggage with low-energy neutrons , converting some of the nitrogen -14 nuclei to nitrogen -15 , with simultaneous emission of gamma rays . Because nitrogen content is usually high in explosive , detection of a high dosage of gamma rays will suggest that a bomb may be present . The sensitivity of the neutral activation analysis depends on the :

Answer»

neutron flux available for IRRADIATION
availability of nucleus to absorb a neutron
ENERGY of decay process
all of the above are correct

SOLUTION :SENSITIVITY of the nutral activation ANALYSIS depends on neutron flux , availablity of nucleus to absorb neutron and energy of the decay process.
Discussion
3666.

To detect bombs that may be smuggled into airplanes , the Federal Aviation Administration (FAA) will soon require all major airports in the United States to install thermal neutrons analysers . The thermal neutron analyser will bombared baggage with low-energy neutrons , converting some of the nitrogen -14 nuclei to nitrogen -15 , with simultaneous emission of gamma rays . Because nitrogen content is usually high in explosive , detection of a high dosage of gamma rays will suggest that a bomb may be present . Nuclear process mentioned above involves reaction :

Answer»

`""_(7) N^(14) + ""_(0) n^(1) to ""_(7) N^(15)`
`""_(7)^(14) N + ""_(0)^(1) n to ""_(6)^(14) C + ""_(1)^(1) H`
`""_(7)^(14) N to ""_(6)^(14) C + ""_(0)^(1) E`
`""_(7)^(14) N to ""_(7)^(15) C + ""_(0)^(-1) e`

SOLUTION :`""_(7)N^(14) + ""_(0) n^(1) to ""_(7) N^(15)`
Discussion
3667.

Which statements is/are right regarding SN^1reactions is false

Answer»

The rate of reaction is influenced by Conc of nucleophile
The reaction takes PLACES in two steps
Racemization takes place
Molecularity of the reaction is two

SOLUTION :CONCEPTUAL
Discussion
3668.

Which of the following is persent in maximum amount in acid rain ?

Answer»

`NO_2`
`H_2SO_4`
`HCL`
`H_2CO_3`

ANSWER :B
Discussion
3669.

The vitamin that is most readily manufactured in our bodies is :

Answer»

VITAMIN A
Vitamin B
Vitamin C
Vitamin D

Answer :D
Discussion
3670.

underset((aq))Co^(2+)+underset((aq))SCN^(-)to complex (a) underset((aq))Ni^(2+)+dmgoverset(NH4OH)to complex (y) The CNof Co, Ni in comp,exes (x) & (y) are four The geometry of complex (x) & (y) are respectively

Answer»

Tetrahedral & square planar
both tetrahedral
Square planar, tetrahedral
both square planar

Solution :`X=[Co(SCN)_(4)]^(2-)`
`Y=[Ni(dmg)_(2)]`
Both of them axetetrahedral and `SP^(3)` hybridised.
Discussion
3671.

The stabilisation of a lyophobic colloid due to:

Answer»

perferential adsorption of similar CHARGED particle on colloids surface.
the large electro-kinetic potential developed in the colloid.
the FORMATION of a COVALENT bond between two phases.
the viscosity of the medium.

Solution :Similar charged colloidal particles will REPEL each other so colloidal system will not be suspended.
Discussion
3672.

Which one of the following on oxidation gives a ketone?

Answer»

PRIMARY alcohol
Secondary alcohol
Tertiary alcohol
All of these

Answer :B
Discussion
3673.

Which of the following names is not correct for the corresponding complex according to IUPAC system ?

Answer»

`[Cr(H_(2)O)_(4)Cl_(2)]NO_(3)` - Tetraaquodichloridochromium (III) nitrate
`[AG(NH_(3))_(2)]^(+)` - Diamminesilver (I) ion
`Na_(3)[AIF_(6)]` - Sodium hexafluoridoaluminium (III)
`[CO(EN)_(3)]Cl_(3)` - Tris (ethylenediamine) cobalt (III) chloride.

Solution :It should be sodium hexafluoroaluminate (III). Complex anion MUST have ending-ate after the name of the metal.
Discussion
3674.

Which one of the following statements in incorrect about enzyme catalysis ?

Answer»

Enzymes are denatured by ultraviolet rays and at LIGHT temperature
Enzymes are LEAST reactive at optimum temperature
Enzymes are mostly proteinous in nature
Enzyme ACTION is specific

Answer :B
Discussion
3675.

What is peptide linkage ?

Answer»

Solution :The -CO-NH- LINKAGE CONNECTING the amino ACID MOLECULES in a peptide linkage.
Discussion
3676.

Which of the following does not show mutarotation ?

Answer»

SUCROSE
FRUCTOSE
Maltose
Lactose

SOLUTION :Sucrose
Discussion
3677.

Which of the following has largest solubility in water ?

Answer»

`MG(OH)_(2)`
`CA(OH)_(2)`
`Ba(OH)_(2)`
`SR(OH)_(2)`

Answer :C
Discussion
3678.

Which of the following reaction cannot change SO_(2)rarrSO_(4)^(2-)?

Answer»

`SO_(2)+MnO_(4)^(-)OVERSET(H^(+))(rarr)`
`SO_(2)+Ba(OH)_(2)rarr`
`SO_(2)+Cr_(2)O_(7)^(2-)overset(H^(+))(rarr)`
`SO_(2)+FE^(3+)overset(H^(+))(rarr)`

Answer :B
Discussion
3679.

When formic acid reacts with PCl_3 it forms :

Answer»

FORMYL CHLORIDE
ACETYL chloride
Methyl chloride
Propionyl chloride

Answer :A
Discussion
3680.

Which of the following order for basic strength is/are correct?

Answer»




SOLUTION :abc
A lone PAIR of `N`- atom PARTICIPATING in resonance will be LESS BASIC
Discussion
3681.

The uncertainties in the position and velocity of a particle are 10^(-10)m and 5.27 xx 10^(-24) ms^(-1) respectively. Calculate the mass of the particle (h= 6.625 xx 10^(-24) J.s)

Answer»

Solution :We have, `Deltax.(m DELTA v)= (h)/(4pi)`
or `m= (h)/(4pi) XX (1)/(Delta x.Delta v)`
`= (6.625 xx 10^(-34) (kg.m^(2)s^(-1)))/(4 xx 3.14 xx (10^(-10)m) (5.27 xx 10^(-24) MS^(-1)))`
= 0.10kg
Discussion
3682.

Which of the following statements for the electrochemical daniel cell

Answer»

Electrons FLOW from copper electrode to zinc electrode
Current flows from zinc electrode to copper electrode
CATIONS move TOWARDS copper electrode which is cathode
Cations move towards zinc electrode

Solution :In Daniel cell copper ROD acts as cathode so there cations move towards copper electrode and reduction take place on copper rod.
Discussion
3683.

underset((aq))Co^(2+)+underset((aq))SCN^(-)to complex (a) underset((aq))Ni^(2+)+dmgoverset(NH4OH)to complex (y) The CNof Co, Ni in comp,exes (x) & (y) are four The geometry of [NiCl_(4)]^(-2)and[NiPph_(3))_(2)Cl_(2)] are

Answer»

TETRAHEDRAL & SQUARE PLANAR respectively
both tetrahedral
both square planar
square planar & tetrahedral respectively

Solution :`[Ni(Pph_(3))Cl_(2)]` are both tetrahedral.
Discussion
3684.

Which of the following statements is are not true for ethane

Answer»

It can be chlorinated with CHLORINE
It can be CATALYTICALLY hydrogenated
When oxidised produces `CO_2` and `H_2O`
It is a homologue of iso-butano

Solution :Ethane is a SATURATED compound it can not be catalytically hydrogenated
Discussion
3685.

Which of the following alcohol has highest solubility in water

Answer»

Secondary butyl alcohol
Tertiary butyl alcohol
Ethelene glycol
Glycerol

SOLUTION :HIGHER the NUMBER of -OH group
Higher the tendency to FORM inter-H-bonding with WATER hence higher will be solubility.
Discussion
3686.

The use of superglue (2-cyanoacrylate) involve:

Answer»

RADICAL chain growth POLYMERIZATION
Ziegler Natta catalytic polymerization
Anionic chain growth polymerization
Cationic chain growth polymerization

Solution :Cyanoacrylates are a strong fast acting adhesives. The ACRYL GROUPS rapidly undergo chain-growth polymerization in the presence of water specially hydroxide ions hence it INVOLVE anionic chain growth polymerization.
Discussion
3687.

What do you mean by non-biodegradable detergents ? How can we make biodegradable detergents ?

Answer»

SOLUTION :Detergents which cannot be DEGRADED by nature. BIODEGRADABLE detergents can be prepared by MINIMISING the branching of the hydrocarbon chain, as unbranched chains can be biodegraded.
Discussion
3688.

Which loses weight on exposure to atmosphere?

Answer»

A saturated SOLUTION of `CO_(2)`
Concentrated `H_(2)SO_(4)`
ANHYDROUS sodium carbonate
Solid NaOH

Answer :A
Discussion
3689.

Which of the following is least reactive towards hydrolysis?

Answer»


`CH_(2)=CH-CH_(2)-Cl`
`(CH_(3))_(3)C Cl`
`Ph-CH_(2)-Cl`

Answer :A
Discussion
3690.

Write the structures of the product of the following reaction Ch_3-CH_2 - underset(CH_3)underset(|)CH- CHO overset(NaBH_4)to

Answer»

SOLUTION :`UNDERSET("2-Methylbutan-1-ol")(CH_3-CH_2-underset(CH_3)underset(|)CH-CH_2 OH)`
Discussion
3691.

Which one of the following does not give a white precipitate with silver nitrate solution:

Answer»

`[CO(NH_3)_6]CI_3`
`[Co(NH_3)_5CI]CI_2`
`[Co(NH_3)_4CI_2]CI`
`[Co(NH_3)_3CI_3]`

ANSWER :D
Discussion
3692.

Which polymer is generally used in carrybags:

Answer»

Polyester
Bakelite
Polyethylene
Alkylresin

Answer :C
Discussion
3693.

Which is least effective for artificial transmutatio

Answer»

Deuterons
Neutrons
`alpha`-PARTICLES
Protons

Solution :DUE to heavy MASS `alpha-` particles can not easily pass through SOLID matter so they are LESS effective for artificial transmutation
Discussion
3694.

Which of the following is not Lewis acid

Answer»

`AlCl_(3).6H_(2)O`
`AlCl_(3)`
`SnCl_(4)`
`FeCl_(3)`

SOLUTION :`AlCl_(3)` acts as a lewis acid as central atom Al has incomplete octet. `SnCl_(4)` and `FeCl_(3)` ACT as lewis acid because Sn and Fe both have empty d - orbitals.
`AlCl_(3)` is `sp^(2)` hybridised, i.e., it has vacant one 3p orbital and five 3D orbitals. But in `AlCl_(3).6H_(2)O` one vacant 3p orbital and five vacant 3d orbitals are FILLED by the electron pair of oxygen. So `AlCl_(3).6H_(2)O` cannot act as a lewis acid.
Discussion
3695.

What is the range of particle size in colloidal solution in nm ?

Answer»

SOLUTION :`1-100` NM.
Discussion
3696.

Which of the following option show more entropy of first compound than second:

Answer»

(i) 1-hexene at `273` K and `1` atm `(ii)` Cyclohexane at `273` K and `1` atm
`(i) overset(12)CH_(4)` at NTP(ii) `overset(14)CH_(4)` atNTP
`(1) SO_(2)(g) "at" 300` K and `0.1` atm `(ii) SO_(2)(g) "at" 300^(@)` C and `0.1` atm
`(i) C_(2)H_(5)OH (l) "at" 46^(@)C` and `1` atm `(ii) CH_(3)OH(l) "at" 46^(@)` C and `1` atm

Solution :N//A
Discussion
3697.

The root mean square speed of gas molecules at a temperature 27K and pressure 1.5 bar is 1 xx 10^(4) cm//sec If both temperature and pressure are raised three times calculate the new rms speed of gas molecules .

Answer»

`9 xx 10^4 cm//s^2`
`3 xx 10^4 cm//s `
`SQRT(3) xx 10^4 cm//s `
`1 xx 10^4 cm//s `

Answer :C
Discussion
3698.

Using the data provided, calculate the multiple bond energy (kJ mol^(-1) ) of a C -= Cbond in C_(2) H_(2). That energy is (take the bond energy of a C- H bond as 350 kJ mol^(-1)) 2 C (s) + H_(2) (g) to C_(2) H_(2) (g) Delta H = 225 k J mol^(-1) 2 C (s) to 2 C (g) "" Delta H = 1410 kJ mol^(-1) H_(2) (g) to 2H (g) "" Delta H = 330 kJ mol^(-1)

Answer»

1165
837
865
815

Answer :D
Discussion
3699.

What is Lucas reagent ? How it is used to identify secondary alcohols?

Answer»

SOLUTION :It is a MIXTURE of CONC. HCL and ANHY. `ZnCl_2`.
Discussion
3700.

Which salt when dissolved in water will hydrolyze ?

Answer»

`Na_2SO_4`
`NACL`
`NH_4Cl`
`KCL`

ANSWER :C
Discussion