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6551.

Which of the following metal is exclusively found in free state ?

Answer»

COPPER ions from the ANODE GOES into the electrolyte
Gold
silver
Mercury

Answer :B
Discussion
6552.

Which of the following compound having number of p pi-dpi bond is equal to p pi-dpi bonds?

Answer»

`SO_(2)`
`SO_(3)`
`O_(3)`
`POCl_(3)`

ANSWER :A
Discussion
6553.

Which of the following B.P. order is not correct

Answer»

`SiF_(4) lt SiCl_(4)`
`CH_(4) lt SiH_(4) lt GeH_(4)`
`CH_(4) lt CD_(4)`
`He lt H_(2)`

Solution :`B.P. He lt H_(2) - VWF`
Discussion
6554.

Wurtz - fitting reaction involves the reaction of sodium metal with

Answer»

Two molecules of an ALKYL HALIDE
ONE molecule of an alkyl halide and on moleculeof an aryl halide
Two molecules of an aryl halide
None of these

Solution :FITTING reaction
Discussion
6555.

Write two differences between ideal solutions and non-ideal solutions.

Answer»

SOLUTION : Difference between ideal solutions and non-ideal solutions :
(1) An ideal solution OBEYS Raoult.s law over the whole concentration range.A non-ideal solution does not obey Raoult.s law over the whole concentration range.
(2) The intermolecular FORCES between A - A and B - B are NEARLY the same as between A - B in ideal solutions. Intermolecular forces between A - A and B - B are not EQUAL to the forces between A - B in non-ideal solution.
Discussion
6556.

What is the pH of 0.001 M aniline solution? The ionisation constant of aniline is 4.27 times 10^-10. (i) Calculate degree of ionization of aniline in the solution.Also calculate the ionisation constant of the conjugate acid of anile.

Answer»

SOLUTION :`(i) C_6H_5NH_2+H_2O leftrightarrowC_6H_5NH_3^(+)+OH`
`K_a=([C_6H_5NH_3^(+)][OH^-])/([C_6H_5NH_2])=([OH^-]^2)/([C_6H_5NH_2])`
`[OH^-]=sqrt(K_a[C_6H_5NH_2])=sqrt((4.27 times10^-10)(10^-3))=6.534 times10^-7M`
`pOH=-log(6.534 times10^-7)=7-0.8152=6.18`
`therefore =14-6.18=7.82`
(ii) Also `C_6H_5NH_2+H_2O leftrightarrow C_6H_5NH_3^(+) +OH^-`
INITIAL C
At. eqm. C-Ca Ca Ca
`K_b=(Ca.Ca)/(C(1-a))=(Ca^2)/(1-a)=Ca^2`
`therefore a=sqrt(K_b//C)=sqrt(4.27 times10^-10//10^-3)=6.53 times 10^-4`
(iii)`pK_a+pK_b=14` (for a pair of CONJUGATE ACID and base )
`pK_b=-log(4.27times10^-10)=10-0.62=9.38`
`thereforepK_a=14-9.38=4.62`
i.e., `-logK_a=4.62orlog K_a=-4.62=5.38`
`K_a=`Antrilog `5.38=2.399 times 10^-5 APPROX 2.4 times 10^-5`
Discussion
6557.

Which polymer is used in the manufacture of paints and lacquers ?

Answer»

Bakelite
GLYPTAL
Polypropene
POLY VINYL chloride

Solution :Glyptal
Glyptal is used in manufacture of PAINTS and lacquires.
Discussion
6558.

xg of NaCl (M=58.5) put in a dry flask and water was added with continous strring to produce exactly 1L solution having a molality of 2.00. Find x using the data below: ltbr. Weight % NaCl Weight % NaCl 0 10 12 14 ltbr. Density of solution in g//mL 1.0591 1.0742 1.0895 1.1049

Answer»


Solution :Molality `=("WT of solute//molar mass of solute")/(("wt of solvent in "GM)/(1000))`
`2=((x)/(58.5))/((W)/(1000))`
or `(x)/(W)=(2xx58.5)/(1000)=0.117`
Now we find `%` wt. of `NaCl`
i.e. `(x)/(x+W)xx100=10.4`
So with the help of table GIVEN.
Density of solution in `gm//mL=1.0742`
Now for `1` it solution
wt of solution `=1074.2gm`
`therefore` wt of solution `=(1074.2-X)gm=W`
`because (x)/(W)=0.117` or `(x)/(1074.2-x)=0.117`
`therefore x=112.5 gram`.
Discussion
6559.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : From the given plot between Z and P for a real gas the correct is :

Answer»

`T_1=(2A)/(Rb)`
`T_2=(a)/(Rb)`
`T_3=(a)/(Rb)`
`T_4=(2a)/(Rb)`

Solution :Graph corresponding to `T_2` shows IDEAL BEHAVIOUR for a range of PRESSURE. Hence, `T_2=a/(Rb)`
Discussion
6560.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : Two vander waals gases have same value of 'a' but different value of b which of the following statement is correct

Answer»

The SMALLER the values of B larger will be compressibility
The larger the values of b larger will be compressibility
Both have same compressibility
The gas with smaller VALUE of b will occupy larger VOLUME

Solution :NA
Discussion
6561.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : Two Vander waals gases have same value 'b' but different 'a' value then which of the following statement is correct under simialr condition .

Answer»

Both gases will occupy same VOLUME
Gas having a LARGER VALUE of `a` will occupy lesser volume
Gas having a larger value of `a` will occupy larger volume
Can not be predicted

Solution :NA
Discussion
6562.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : The figure shows the effect of pressure on the compressibility factor, Z of a gas :

Answer»

The curve AE can be explained by PV=RT
The curve AF and CD can be explained by PV=RT+Pb
The curve AB can be explained by PV=RT-`a/V`
All the THREE curves AF,AE and AD shows the real behaviour

Solution :(A)For AE, Z = constant `implies PV=RT`
(B)At higher pressure PV=RT+Pb
( C)At LOWER pressure `PV=RT-a/V`
Discussion
6563.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : Which of the following statements is correct regarding a fixed amount of ideal gas undergoing the following process :

Answer»

Root MEAN square (RMS) speed of gas molecules increase during the process `AtoB`
Density of the gas increases during the process `AtoB`
Such a graph is not possible
If `P_B=4P_A` then `V_A=4V_B` (where `P_A,V_A, P_B` & `V_B` represent pressure and volume values at states A and B).

Solution :(A)Temperature decreases during process A to B, so RMS speed decreases (`because V_(RMS)prop sqrtT`)
(B)`d_(gas)=(PM)/(RT)`UPON moving from A to B, P increases and temperature decreases.So, density of gas increases.
( C)This graph is possible if during the process :`P prop 1/(V^(1//2))`
`because PT="Constant" THEREFORE P((PV)/(nR))="Constant" :. P^2V="Constant" or PV^(1//2)=` Constant
(D)If `P_B=4P_A`, then `V_A=16V_B`(according to `P^2V` =Constant for process)
Discussion
6564.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : Which of the following graphs is not possible for a fixed amount of ideal gas upon moving from initial state A to final state B :

Answer»

<P>


None of these

Solution :(A)This GRAPH is possible if temperature of gas is kept constant and pressure is INCREASED from A to B
(B)This graph is possible if temperature of gas is increased continuously during the process A to B.
( C)This graph is possible if during the process : `P prop 1/v^2`
`because VT="constant" " " :. " " V((PV)/(nR))="Constant" orPV^2="constant"`
Discussion
6565.

When a sample of ideal gas is changed from an initial state to a final state, various curves can be plotted for the process like P-V curve, V-T curve,P-T curve etc. For example, P-V curve for a fixed amount of an ideal gas at constant temperature is a rectangular hyperbola, V-T curve for a fixed amount of an ideal gas at constant volume is again a straight line. However, the shapes may vary if the constant parameters are also changed. Now, answer the following questions : Two moles of an ideal gas is changed from its initial state (16 atm, 6L) to final state (4 atm, 15L) in such a way that this change can be represented by a straight line in P-V curve.The maximum temperature attained by the gas during the above change is :(Take : R=1/12L atm K^(-1) "mol"^(-1))

Answer»

324 K
648 K
1296 K
972 K

Solution :Equation of staight line
`(y-y_1)=((y_2-y_1)/(x_2-x_1))(x-x_1)" " :. (P-16)=((4-16)/(15-6))(V-6)`
`:. 3P+4V=72 implies T_("MAX")=((PV)_(max))/(nR)`
For `(PV)_(max)((PV)_(max)).3P=72/2` and `4V=72/2 :. P=12,V=9 " " T_(max)=(12xx9)/(1XX(1//12))=648 K`
Discussion
6566.

Write the cell reaction and calculate the potential of the cell, Cl_2 (p=0.9 atm) |NaCl solution |Cl_2 (p=0.1 atm) Will the cell reaction be spontaneous as written?

Answer»

SOLUTION :`-0.0282` VOLT
Discussion
6567.

Unit of J pa^(-1) is equivalent to:

Answer»

`m^(3)`
`CM^(3)`
`DM^(3)`
NONE of these.

Answer :A
Discussion
6568.

Which of the followingis a vitamin ?

Answer»

ASPARTIC acid
Adipic acid
Ascorbic acid
Saccharic acid

Answer :B
Discussion
6569.

The reduction potential of hydrogen half cell will be negative if:

Answer»

`p(H_(2))=1ATM and [H^(+)]=1.0M`
`p(H_(2))=2ATM and [H^(+)]=1.0M`
`p(H_(2))=2atm and [H^(+)]=2.0M`
`p(H_(2))=1atm and [H^(+)]=2.0M`

SOLUTION :For hydrogen ELECTRODE
`H^(+)(aq)+e^(-)to(1)/(2)H_(2)(g)`
`E=E^(@)-(0.0591)/(1)"log"((p_(H_(2)))^(1//2))/([H^(+)])`
`=-0.0591"log"((p_(H_(2)))^(1//2))/([H^(+)])""(becauseE^(@)=0)`
E will be -ve when `((p_(H_(2)))^(1//2))/([H^(+)])` is +ve,
i.e., `(p_(H_(2)))^(1//2)gt[H^(+)]` which is so in case of (b).
Discussion
6570.

Which of the following statements are correct about the kinetics of this reaction ?

Answer»

The rate of REACTION DEPENDS on the concentration of only (ii)
The rate of reaction depends on concentration of both (i) and (ii)
MOLECULARITY of reaction is one
Molecularity of reaction is TWO

Solution :The carbocation formation is a slow step which includes only (ii). Thus, the reaction rate depends onlt on (ii) and molecularity of reaction is (i).
Discussion
6571.

When K_(2)Cr_(2)O_(7) is heated with conc. H_(2)SO_(4) in the presence of a soluble metal chloride, orange red vapours are produced. These are due to :

Answer»

`Cr_2O_3`
`CrOCl_2`
`CrO_4^(2-)`
`CrO_2Cl_2`

ANSWER :D
Discussion
6572.

To what extent do the electronic configuration decide the stability of oxidation states in the first series of transition elements ? Illustrate your answer with example .

Answer»

Solution :In a transition series, the oxidation STATES which lead to noble GAS or exactly half- FILLED or completely filled d- orbitals are more stable. For example, in the first transition series, electronic configuration of Mn `(Z= 25)` is `[Ar]3D^(5) 4s^(2)`. It shows oxidation states `+2` to `+7` but Mn (II) is most stable becasue it has the half - filled configuration `[Ar] 3d^(5)`
Similarly `Sc^(3+)` and `Zn^(2+)` are more stable asillustration below `:`
`. _(21) Sc = [Ar] 3d^(1) 4s^(2) , Sc^(3+) = [Ar] , i.e., `noble gas configuration
`._(30)Zn = [Ar] 3d^(10) 4s^(2) , Zn^(2+) =[ Ar] 3d^(10) , `i.e., completely filled configuration
Discussion
6573.

When copper ore is mixed with silica, in a reverberatory furnace, copper matte is produced. The copper matte contains

Answer»

SULPHIDES of copper (II) and iron (II)
sulphides of copper (II) and iron (III)
sulphides of copper (I) and iron (II)
sulphides of copper (I) and iron (III)

Solution :It is correct answer.
Discussion
6574.

Which of the following statements is / are correct ?

Answer»

All CARBON to carbon bonds contain a sigma bond and ONE or more `PI`- bonds
All carbon to carbon bonds are sigma bonds
All oxygen to hydrogen bonds are hydrogen bonds
All carbon to hydrogen bonds are sigma bonds

Answer :D
Discussion
6575.

total number of Boron atoms in anionic part of borax which participate in back bonding.

Answer»


Solution :BORAX: `2Na^(+)[B_(4)O_(5)(OH)_(4)]^(2-).8H_(2)O`

`sp^(2)`-HYBRIDIZED BORON atoms only participate in `p pi- p pi` back BONDING.
Discussion
6576.

Which has a higher enthalpy of adsorption, physisorption or chemisorption ?

Answer»

Solution :Chemisorption has HIGHER enthalpy of ADSORPTION because it involves chemical bond FORMATION.
Discussion
6577.

What is the role of flux in metallurgical processes?

Answer»

Solution :(i) Flux is USED to remove the gangue by COMBINING with it THUS, SLAG formation takes place.
Discussion
6578.

Write the composition of brass and german silver ?

Answer»

Solution :BRASS is an alloy of copper and zinc `(60% Cu and 40% ZN)` GERMAN silver is an alloy of copper, zinc and vickel `30% Cu, 30%Zu, 40%Ni`
Discussion
6579.

Which of the following carboxylic acid is most reactive towards decarboxylation?

Answer»




ANSWER :D
Discussion
6580.

What is the value of slope of graph of concentration of R versus time for zero order reaction?

Answer»

`(K)/(2.303R)`
`-(E_(a))/(2.303)`
`-K`
`-(E_(a))/(2.303R)`

ANSWER :D
Discussion
6581.

What will be the most probable product when compound 'X' is treated with two equivalents of NaOH

Answer»




SOLUTION :The ACID strength order is :
-COOH gt PH-OHgt -C`-=` CH [p-Nitro -OH gt o-Nitro -OH]
Discussion
6582.

Which of the following will not undergo aldol condensation ?

Answer»

Propional dehyde
Acetone
Formaldehyde
Acetaldehyde

ANSWER :C
Discussion
6583.

Which of the following reaction(s) is correctly matched with major product ?

Answer»




ANSWER :B
Discussion
6584.

Which one of the following statements about rocket propellants is not true

Answer»

Rocket propellants have to burn in the ABSENCE of atmospheric oxygen
Specific impulse is the criterion for PROPELLANT performance
Liquid oxygen and hydrazine constitutes a liquid propellant
A propellant CONSISTING of liquid `N_(2)O_(4)` and acrylic rubber is a double BASE propellant

Answer :D
Discussion
6585.

Which of the following statements is/are incorrect for the complex [Cr(H_(2)O)_(6)]Cl_(3)?

Answer»

It has a magnetic MOMENT of 3.83 BM.
The distribution of 3d electrons is `3dxy^(1),3dyz^(1),3dzx^(1)`.
The ligand satisfies both PRIMARY and secondary VALENCIES of chromium
It SHOWS co-ordination as well as hydrate isomerism.

Answer :C::D
Discussion
6586.

The total number of optically active compounds from the following list is C_(2)H_(5)NHCH_(3),CH_(3)CH_(2)CH(CH_(3))N(CH_(3))C_(2)H_(5),[Pg(CH_(3))(C_(2)H_(5))overset(+)(N)H]I^(-),[(CH_(3))_(2)(C_(2)H_(5))overset(+)(N)H]I^(-),C_(6)H_(5)(CH_(3))(C_(2)H_(5))overset(+)(N)-O^(-),(CH_(3))(C_(2)H_(5))NCH(CH_(3))_(2).

Answer»


Solution :THREE compounds are optically active. These are:
amine: `CH_(3)CH_(2)overset(**)(C)H(CH_(3))N(CH_(3))C_(2)H_(5)`,
quaternary ammonium salt:
` [Ph(CH_(3))(C_(2)H_(5))overset(+)(N)H]I^(-) and ` amide N-oxide: `C_(6)H_(5)(CH_(3))(C_(2)H_(5))overset(+)(N)-O^(-)`.
Discussion
6587.

Which of these is not likely to act as Lewis base?

Answer»

`BF_3`
`PF_3`
`CO`
`F^-`

ANSWER :A
Discussion
6588.

Which is stronger acis:

Answer»

`H_2SeO_4`
`H_2SO_4`
`H_2TeO_4`
`H_2O`

ANSWER :B
Discussion
6589.

Which one of the following compounds undergoes mononitration to yield considerable amount of m-product-

Answer»





Solution :
During the NITRATION of aniline, `-NH_(2)` group GETS protonated and form anilinium ION `(-overset(+)(N)H_(3))`. The `-overset(+)(N)H_(3)` group is deactivating and meta-orienting. THUS during the mononitration of aniline, SIGNIFICANT amount of meta-product is obtained.
Discussion
6590.

Write IUPAC name of the following:

Answer»

SOLUTION :2-methoxy-5-methylphenol.
Discussion
6591.

What are the ultimate products of digestion of proteins ?

Answer»

SOLUTION :`ALPHA`-AMINO ACIDS.
Discussion
6592.

The total number of aromatic species generated in the following reactions is

Answer»

ZERO
2
3
4

Solution :
Discussion
6593.

The standard electrode potential of the half cells are given below : Zn^(2+)+ 2e^(-) rarr Zn(s), E^(o) = - 7.62 V Fe^(2+) + 2e^(-) rarr Fe(s) , E^(o) = -7 .81 V The emf of the cell Fe^(2+) + Zn rarr Zn^(2+) + Fe will be :

Answer»

`1.54` V
`-1.54` V
`-0. 19` V
`+ 0 . 19 ` V

ANSWER :A
Discussion
6594.

Which is not a molecular formula?

Answer»

`N_(2)O`
`CA(NO_(3))_(2)`
`C_(2)H_(4)O_(2)`
`C_(6)H_(12)O_(6)`

Answer :B
Discussion
6595.

The volume of 0.1 M H_(2)SO_(4) that is needed to completely neutralise 40 ml of 0.2 M NaOH is

Answer»

10 ml
20 ml
40 ml
80 ml

Solution :`N_(1)V_(1)+N_(2)V_(2) IMPLIES 0.2xxV_(1)=0.2xx40 impliesV_(1)=40ml`
Discussion
6596.

Which of the following gives ketone on oxidation?

Answer»

`(CH_3)_3COH`
`CH_3 - CH_2 - CH_2OH`
`CH_3 - UNDERSET(CH_3)underset(|)(CH) - CH_2OH`
`CH_3- underset(OH)underset(|)(CH) - CH_3`

SOLUTION :`CH_3- underset(OH)underset(|)(CH) - CH_3`
Discussion
6597.

Which of the following are correct SI units?

Answer»

Amount of substance in MOL `L^(-1)`
PRESSURE of GAS in pascal
Density of a solid in kg `m^(-1)`
Force in NEWTON.

Answer :A
Discussion
6598.

What are metaldehyde and paraldehyde?

Answer»

SOLUTION :Metaldehyde is a tetramer or ACETALDEHYDE. It is used as a fuel
Paraldehyde is a TRIMER of acetaldehyde. It is used as hypnotic drug
Discussion
6599.

Which of the following does not give test with dil. and conc. H_2SO_4 ?

Answer»

`NO_2^(-)`<BR>`Br^(-)`
`SO_3^(2-)`
`SO_4^(2-)`

Solution :Only `NO_2^(-), CL^(-) and Br^(-)` give TEST with dil. and CONC. `H_2SO_4`
Discussion
6600.

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

Answer»

SOLUTION :P=17.44 MM HG.
Discussion