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11601.

Which one among the following statements regarding the properties of mixtures and compounds is not correct ?

Answer»

A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents
A mixutre may be homogenous or heterogeneous but a compound is a homogenous substance
The constituents of a mixture can be SEPARATED by PHYSICAL methods but those of a compound cannot be separated by physical methods
ENERGY is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound

Solution :The compound is always formed by ABSORPTION or evolution of energy but no energy is RELEASED or absorbed during the formation of mixture.
Discussion
11602.

The resistance of a conductivity cell with 0.1 M KCl solution is found to be 2002 at 298 K. When the same cell was filled with 0.02 M NaCl solution, the resistance at the same temperature is found to be 1100 Omega. Calculate: (i) the cell constant of the cell in m^(-1) (ii) the molar conductivity of 0.02 M NaCl solution in S m^(2)mol^(-1) Given : Conductivity of 0.1 M KCl solution at 298 K = 1.29 S m^(-1)

Answer»


Solution :Cell constant = `1.29 xx 200 = 258 m^(-1)` or `= 2.58 cm^(-1)`
`kappa = 2.58 xx (1)/(1100) = 2.345 xx 10^(-2) S cm^(-1)`
`LAMBDA = (2.345 xx 10^(-3) xx 1000)/(0.02) = 117.25 S cm^(2) MOL^(-1)` or `= 1.175 xx 10^(-2) S m^(2) mol^(-1)`
Discussion
11603.

Which of the following compound is most acidic ?

Answer»

`Cl - CH_2 - CH_2 - OH`


Solution :DUE to electron withdrawing nature of `-NO_2`GROUP, o-nitrophenol is most acidic AMONG all the given compounds.
Discussion
11604.

Which of the following ions has the maximum magnetic moment?

Answer»

`MN^(2+)`
`Fe^(2+)`
`Ti^(2+)`
`Cr^(2+)`

Solution :`""_(25)Mn=[Ar]^(18)3d^(5)4s^(2).thereforeMn^(2+)=[Ar]^(18)3d^(5)`
`""_(26)Fe=[Ar]^(18)3d^(6)4s^(2).thereforeFe^(2+)=[Ar]^(18)3d^(6)`
`""_(22)Ti=[Ar]^(18)3d^(2)4s^(2). thereforeTi^(2+)=[Ar]^(18)3d^(2)`
`""_(24)Cr=[Ar]^(18)3d^(5)4s^(1).thereforeCr^(2+)=[Ar]^(18)3d^(4)`
Thus `Mn^(2+)` has maximum number of unpaired ELECTRONS.
Discussion
11605.

The Solvay process can be represented by the following scheme: Identify A, B ,C, D, E

Answer»

Solution :`Ca(OH)_(2) , NH_(4)HCO_(3) , Na_(2)CO_(3) , NH_(4)Cl , CaCl_(2)`
Discussion
11606.

What type of forces are responsible for the formation of beta-pleated sheet structure?

Answer»

SOLUTION :HYDROGEN BONDS.
Discussion
11607.

To obtain unsaturated alcohols from unsaturated aldehydes the followling reagent is used for reduction:

Answer»

`NA` AMALGAM/`H_2O`
DIL.`H_2SO_4`
`Zn//HCl`
`LiAlH_4`

ANSWER :D
Discussion
11608.

The values of gas constant and solution constant

Answer»

are different
almost IDENTICAL
GAS constant is GREATER than SOLUTION constant
gas constant is smaller than solution constant

Answer :B
Discussion
11609.

Why are medicines more effective in colloidal state?

Answer»

SOLUTION :DUE to LARGE surface AREA these are EASILY assimilated or adsorbed.
Discussion
11610.

When H_2S is passed through an ammoniacal salt solution X, a buff coloured precipitate is obtained. Then X can be a

Answer»

`Co^2+` SOLUTION
`Mn^2+` solution
`Ni^2+` solution
 `ZN^(2+)` solution

Answer :B
Discussion
11611.

Which one is liquid at room temperature:

Answer»

`CH_3Cl`
`C_2H_5Cl`
`CH_3Br`
`C_2H_5Br`

ANSWER :D
Discussion
11612.

When sulphur dioxide is passed through an acidified K_(2)Cr_(2)O_(7) solution, the oxidation state of sulphur is changed from

Answer»

`+4` to `+6`
`+6` to `+4`
`+4` to 0
`+4` to `+2`

SOLUTION :`ul(K_(2) Cr_(2)O_(7) +4H(2) SO_(4)rarr K_(2)SO_(4) + Cr_(2)(SO_(4))_(3) + 7H_(2)O+ 3(O))`
`SO_(2) + (O) + H_(2) O rarr H_(2) SO_(4) ] xx3`
`K_(2)Cr_(2)O_(7) + H_(2)SO_(4) + 3SO_(2) rarr K_(2)SO_(4) + Cr_(2)(SO_(4))_(3) + H_(2)O`
In `SO_(2)` , OX. state of `S= + 4 `. In `SO_(4)^(2-)`,ox.state of `S= +6`
Discussion
11613.

Write one similarity between Physisorption and Chemisorption.

Answer»

SOLUTION :Both physisorptin and chemisorption INCREASE with increase in SURFACE AREA of the adsorbent.
Discussion
11614.

Which does not react with KMnO_4 solution ?

Answer»

`O_3`
`H_2O_2`
`H_2S`
`H_2SO_4`

ANSWER :A
Discussion
11615.

Which of the following compound is expected to be optically active

Answer»

`(CH_(3))_(2)CHCHO`
`CH_(3)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CHBrCHO`
`CH_(3)CH_(2)CBr_(2)CHO`

SOLUTION :
Discussion
11616.

What are covalent solids ? Give example and state its properties.

Answer»

Solution : A solid in which the constituent particles are held together by a covalent bond between adjacent atom in entire crystal forming a large network of bonds are called covalent solids.
Covalent solids are also called GIANT molecules.
Covalent solids are MADE of non-metallic atoms and these atoms are bound by covalent bond. Example : Diamond, silicon carbide, silica (quartz) etc.
Properties of covalent solids : Covalent bonds are strong and directional and therefore atoms are held very strongly at their positions and as a RESULT these solids are very hard and BRITTLE.
They have extremely high melting points and may even decompose before melting.
They are electrical insulators (Except: graphite) because of ABSENCE of free electrons.
Discussion
11617.

Which one of thefollowing is bacteria antibiotics?

Answer»

Erythnomycin
tetracycline
Aminoglycosides
Chloramphenicol

Answer :C
Discussion
11618.

Which of the following is likely to have smallest dipole moment

Answer»

`CH_3CH_2Cl`
`CH_3CH_2CH_2-CL`
`(CH_3)_3 C - Cl`

Solution :Dipole moment upon polarity of the BOND C-Cl bond in chlorobenzene LESS POLAR but to `SP^2 C - Cl `
Discussion
11619.

Which of the following is most stable?

Answer»




ANSWER :A
Discussion
11620.

Which of the following does not form phenol phenoxide ion

Answer»

`C_(6)H_(5)Cl`
`C_(6)H_(5)COOH`
`C_(6)H_(5)N_(2)Cl`
`C_(6)H_(5)SO_(3)Na`

Solution :Benzoic ACID
Discussion
11621.

Which of the folloing combination of volumes (mL) of C_2H_4(g) and O_2(g) respectively is required to obtain 400 mL of CO_2(g)? All volumes are measured at STP.

Answer»

100 , 300
200 , 600
200 , 200
300 , 300

Answer :B
Discussion
11622.

Theslopeof agraphl n[A_(t)]versus t fora firstorderreactionis-2.5xx10^(-3) s^(-1) . Therateconstantforthereactionwill be

Answer»

`5.76 xx10^(-3) s^(-1) `
`1.086xx10^(-3)s^(-1) `
`-2.5xx10^(-3) s^(-1)`
`2.5 xx10^(-3)s^(-1)`

SOLUTION :SLOPE`=(-K)/(2.303)`
`k=2.5xx10^(-3)xx2.303=5.76xx10^(-3)S^(-1)`
Discussion
11623.

Which of the following statements is not true about enantiomers

Answer»

They have same PHYSICAL PROPERTIES
They have different BIOLOGICAL properties
They have same chemical properties towards CHIRAL compounds
None of these

Solution :Enantiomers have same chemical properties but different physical properties.
Discussion
11624.

The tailing of mercury by ozone is due to the fromationn of................ .

Answer»

SOLUTION :`Hg_(2)O`
Discussion
11625.

You are given the following two complexes X and Y which are isomers of each other, X is Hg [Co(SCN)_(4)]. It is further given that 'spin only' magnetic moment of X is found to be 3.78 BM and that of Y is 1.73 B.M. Then which of the following is correct ?

Answer»

Anion of X will be TETRAHEDRAL and that of Y will be square planar
Anion of X will be square planar but that of Y will be tetrahedral
Both the anions will be tetrahedral
Both the anions will be square planar

Solution :`X rightarrow Hg[CO(SCN)_(4)],Y rightarrow Hg[CO(NCS)_(4)]`
Discussion
11626.

Two liquids A & B from azeotropic mixture then the ratio of ((y_(A)xxy_(B))/(x_(A)xx x_(B)))=?

Answer»


ANSWER :A
Discussion
11627.

Which of the following is obtained in a carbyl amine reaction ?

Answer»

`C_6H_5NH_2`
`COCl_2`
` C_6H_5CN`
` C_6H_5NC`

ANSWER :D
Discussion
11628.

When gas is dissolve in liquid solvent and form solution, then according to Raoult's law its vapour pressure will be …….

Answer»

<P>`(P^(@)-P)/(P^(@))=(N)/(n+N)`
`P=K.(N)/(n+N)`
`P=K_(H).X_(A)`
`P=P_(A)+P_(B)`

Answer :A
Discussion
11629.

Write the name and formula of the ester formed in the reaction of acetyl chloride and methyl alcohol.

Answer»

SOLUTION :`CH_3COOCH_3`
Discussion
11630.

Which of the following esters is used for artificial flavour of pineapple :

Answer»

Octyl acetate
Isobutyl formate
Ethyl butyrate
Isoamyl valerate

Answer :C
Discussion
11631.

Which one of the following cations does not form a complex with ammonia :

Answer»

`AG^+`
`CU^(2+)`
`Cd^(2+)`
`Pb^(2+)`

ANSWER :D
Discussion
11632.

When sucrose is hydrolyzed it produced dextro-rotatory "glucose " and leavo-rotatory "fructose" whereas reactant itself is a dextro-rotatory compound. The above conversion process follows first order kinetics. Similarly an optically active compound A hydrolyzed as follows : A+ H_(2) O overset( H^(+))(rarr) 2B + C The observed rotation of compound A,B and C are 60^(@), 50^(@) and - 80^(@) per mole respectively. The angle of rotation after 40 minutes and after the completion of reaction were 26^(@) and 10^(@)respectively at 27^(@)C and activation energy for conversion is 27kJ mol^(-1) . The value of rate constant of above reaction at 27^(@)C is :

Answer»

`5.57 xx 10^(-3) mi N^(-1)`
`1.94xx 10^(-3) mi n^(-1)`
`1.37 xx 10^(-6) mi n^(-1)`
`6.13 xx 10^(-3) mi n^(-1)`

Answer :A
Discussion
11633.

Which of the following will fovour the reverse reaction in a cheical equilibrium

Answer»

Increasing the concentration of the reactants
REMOVAL of at LEAST ONE of the products at regular INTERVALS
Increasing the concentration of one or more of the products
None of these

Answer :C
Discussion
11634.

Which of the following compound possess strongest hydrogen bond ?

Answer»

Ethyl ammine
Ethyl alcohol
Diethyl ETHER
Ammonia

Solution :`CH_(3)CH_(2)OH` -Ethyl alcohol-OH In ethanol, the formation of H-bond is POSSIBLE.
Discussion
11635.

When sucrose is hydrolyzed it produced dextro-rotatory "glucose " and leavo-rotatory "fructose" whereas reactant itself is a dextro-rotatory compound. The above conversion process follows first order kinetics. Similarly an optically active compound A hydrolyzed as follows : A+ H_(2) O overset( H^(+))(rarr) 2B + C The observed rotation of compound A,B and C are 60^(@), 50^(@) and - 80^(@) per mole respectively. The angle of rotation after 40 minutes and after the completion of reaction were 26^(@) and 10^(@)respectively at 27^(@)C and activation energy for conversion is 27kJ mol^(-1) . At what temperature half life of above process is equal to 31.1 minutes.

Answer»

350 K
280K
310.8K
390K

Answer :C
Discussion
11636.

When sucrose is hydrolyzed it produced dextro-rotatory "glucose " and leavo-rotatory "fructose" whereas reactant itself is a dextro-rotatory compound. The above conversion process follows first order kinetics. Similarly an optically active compound A hydrolyzed as follows : A+ H_(2) O overset( H^(+))(rarr) 2B + C The observed rotation of compound A,B and C are 60^(@), 50^(@) and - 80^(@) per mole respectively. The angle of rotation after 40 minutes and after the completion of reaction were 26^(@) and 10^(@)respectively at 27^(@)C and activation energy for conversion is 27kJ mol^(-1) . The value of t_(1//2) for above process is at 127^(@)C

Answer»

5.68 minutes
1.2 HOURS
8.4 minutes
1.5 hours

ANSWER :C
Discussion
11637.

The value of Planck's constant is 6.63xx10^(-34) Js. The velocity of light is 3.0xx10^(8)ms^(-1). Which value is closest to the wave length in nanometers of a quantum of light with frequency 8xx10^(15)s^(-1)?

Answer»

`2 xx 10^(-25)`
`5 xx 10^(-18)`
`3 xx 10^(7)`
`40`.

Answer :D
Discussion
11638.

The specific rotation of a freshly prepared solution of alpha-D- Glucose changes from a value of x^(@) to a constant value of y^(@). The values of x and y are respectively

Answer»

`19^(@), 52.5^(@)`
`111^(@), 52.5^(@)`
`52.5^(@), 19^(@)`
`52.5^(@), 111^(@)`

ANSWER :B
Discussion
11639.

Which one is most stable to heat ?

Answer»

HCLO
`HClO_2`
`HClO_3`
`HClO_4`

ANSWER :D
Discussion
11640.

Which of the following are true for electrolytic extraction of aluminium ?

Answer»

CATHODE material contains graphite
Anode material contains graphite
Cathode reacts AWAY FORMING `CO_(2)`
Anode reacts away forming `CO_(2)`

Answer :A::B::D
Discussion
11641.

The true statements from the following are 1. PH_(5) and BiCl_(5) do not exist 2.pi pi- dpi bond is present in SO_(2) 3. Electrons travel with the speed of light 4. SeF_(4) and CH_(4) have same shape 5. I_(4)^(+) has bent geometry

Answer»

1,3
1,2,5
1,3,5
1,2,4

Solution :`SeF_(4)` has distorted tetrahedral GEOMETRY while `CH_(4)` has tetrahedral geometry.
Discussion
11642.

Which of the following is not oxidised by O_3?

Answer»

`KL`
`FeSO_4`
`KMnO_4`
`K_2MnO_4`

ANSWER :C
Discussion
11643.

Which two are closest to one another in size ?

Answer»

`Li^(+) and Na^(+)`
`Be^(+2) and Mg^(+2)`
`Be^(+2) and Li^(-)`
`Li^(+) and Mg^(+2)`

Solution :`Li^(+) & mg^(2+)` [ due to DIAGONAL RELATIONSHIP]
Discussion
11644.

The standard reduction potential for Li^(+)//Li,Zn^(2+)//Zn,H^(+)//H_(2) and Ag^(+)//Ag is -3.05, -0.762, 0.00 and +0.80V. Which of the following has highest reducing capacity

Answer»

Ag
`H_(2)` is anode and `Cu` is cathode
`Zn`
`Li`

SOLUTION :`E^(o)=-3.05Li^(+)//Li` is most negative (minimum) and hence Li has MAXIMUM TENDENCY to LOSE electrons or it I the STRONGEST reducing agent.
Discussion
11645.

Which of the following has the shortest Cr-C bond length ?

Answer»

`[Cr(CO)_(6)]`
`[Cr(NH_(3))_(3)(CO)_(3)]`
`[Cr(PF_(3))_(3)(CO)_(3)]`
`[Cr(PPh_(3))_(3)(CO)_(3)]`\

Solution :`[Cr(NH_(3))_(3)(CO)_(3)]` DUE to the PRESENCE of classical ligand `NH_(3)` electron density at the central metal atom increases.
`NH_(3)` `rarr` Classical ligand
Synergic bonding with CO increases, Cr-O bond length increases.
Cr-C bond length decreases Maximum back bonding to `pi^(*)` CO occurs in `[Cr(NH_(3))_(3) (CO)_(3) ]` , thus, M -C bond order`uarr`, B.L.`darr`
NOTE : `NH_(3)` doesn’t show back bonding.
Discussion
11646.

There is no S-S bond in:

Answer»

`S_2O_4^(2-)`
`S_4O_6^(2-)`
`S_2O_3^(2-)`
`S_2O_7^(2-)`

ANSWER :D
Discussion
11647.

Which of the following statements regarding chlorobenzene is correct, in electophlilic substitutionreaction

Answer»

Less REACTIVE than benzene due to INDUCTIVE EFFECT of chlorine
Orienation of SUBSTITUTION is controlled by resonance effect
More reactive than benzene due to resonance effect
Less reactive than benzene due to resonance effect

Solution :Due to inductive effect and resonance effect
Discussion
11648.

What is the role of limestone (CaCo_3) in the extraction of iron?

Answer»


ANSWER :On heating limestone give CaO and `CO_2`. The CaO FORMED ACTS as basic flux to REMOVE `SiO_2`(GANGUE) as `CaSiO_3` slag.
Discussion
11649.

Which one of the following is the most correct statement?

Answer»

BRASS is an INTERSTITIAL ALLOY, while STEEL is a substitutional alloy
Brass is a substitutional alloy, while steel is an interstitial alloy
Brass and steel are both substitutional alloys
Brass and steel are both interstitial alloys

Answer :C
Discussion
11650.

The standard reduction potentials for two reactions are given below: AgCl(s)+e^(-)toAg(s)+Cl^(-)(aq),E^(@)=0.22V ltBrgt Ag^(+)(aq)+e^(-)toAg(s),E^(@)=0.80V Calculate the solubility product of AgCl under standard conditions of temperature (298K).

Answer»

SOLUTION :Subtracting second eqn. from the FIRST eqn., we get
`AgCl(s)hArrAg^(+)(aq)+Cl^(-)(aq),E^(@)=-0.58V`
Applying nernst EQUATION,
`E=E^(@)-(0.0591)/(1)"LOG"([Ag^(+)][Cl^(-)])/([AgCl(s)])`
Putting `AgCl(s)=1` and at equilibrium `E=0`
`E^(@)=0.0591log[Ag^(+)][Cl^(-)]=0.0591logK_(sp)`
`-0.58=0.0591" log "K_(sp)" or log "K_(sp)=-9.8139=overline(10).1861`
or `K_(sp)="Antilog "overline(10).1861=1.535xx10^(-10)`.
Discussion