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20601.

Which of the following statements about the composition of the vapour over an ideal 1:1 molar mixture of benzene and toluene is correct ? Assume that the temperature is constant at 25^(@)C. (Given : Vapour Pressure Data at 25^(@)C, benzene = 12.8 kPa, Toluene = 3.85kPa)-

Answer»

The vapour will contain a HIGHER percentage of benzene
The vapour will contain a higher percentage of toluene
The vapour will contain EQUAL amounts of benzene and toluene
Not enough INFORMATION is given to make a prediction

ANSWER :A
Discussion
20602.

Which of the following complex ion of Ag cation have correct indicated properties, where L is a weak monodentate neutral ligand?

Answer»

`[AgL_(2)]^(+)` : LINEAR and diamagnetic
`[AgL_(4)]^(+)` :tetrahedral and PARAMAGNETIC
`[AgL_(6)]^(2+)` : octahedral and paramagnetic
`[AgL_(4)]^(3+)` : square planar and diamagnetic

Answer :A::C::D
Discussion
20603.

While washing oily or greasy part of the vessel, the soap, oil and water form___________.

Answer»

OIL in WATER TYPE EMULSION
water in oil type emulsion
precipitate
sol

Answer :A
Discussion
20604.

Which of the following is not correctly matched ?

Answer»

`[MnCl_(4)]^(-2)` TETRAHEDRAL, zero CFSE
`[PT(NH_(3))(Br),(Cl) (PY)]` tetrahedral, EAN = 36
`[Fe(CO)_(2)(NO)_(2)]` tetrahedral, EAN = 36
`[Co(CO)_(4)]^(-)` tetrahedral, C–O B.L. larger than CO

Answer :B
Discussion
20605.

Write the chemical equations involved when C_(2)H_(5)NH_(2) is treated with the following reagents : (i) CH_(3)COCl//"pyridine" (ii) C_(6)H_(5)SO_(2)Cl (iii) CHCl_(3)+KOH

Answer»

Solution :(i) `UNDERSET("Ethyl amine")(C_(2)H_(5)NH_(2))+underset("Acetyl chloride")(CH_(3)-overset(overset(O)(||))(C)-Cl) overset("Pyridine")(RARR) underset("N-Ethylethanamide")(C_(2)H_(5)NHCOCH_(3))+HCl`
(ii) `C_(2)H_(5)NH_(2)+underset(underset("Chloride")("Benzene sulphonyl"))(C_(6)H_(5)SO_(2)Cl) rarr underset(underset("sulphonamide")("N-Ethylbenzene"))(C_(2)H_(5)NHSO_(2)C_(6)HN_(5))+HCl`
(iii)`underset("ETHYLAMINE")(C_(2)H_(5)NH_(2))+CHCl_(3)+KOH rarr underset("Ethyl isocyanide")(C_(2)H_(5)NC)+3KCl+3H_(2)O`
Discussion
20606.

Which of the following statement is are correct ?

Answer»

`S_2O-8^(2-)` oxidises `Ag^(+)` in presence of pyridine and give red colour compound
`MnO_4^(2-)` disproportionates to yield `MnO_4^(-)` and `MnO_2` in presence of `H^+` ions
In `Cr_2O_7^(2-)` each Cr is linked to four OXYGEN atoms
`Ti^(2+)` is coloured while `Ti^(4+)` is colourless in AQUEOUS solution

Solution :(A)`2Ag^(+)+S_2O_8^(2-)to2Ag^(2+)+2SO_4^(2-) , Ag^(2+)+4pyto[Ag(py)_4]^(2+)` (red)
(B)`3MnO_4^(2-)+4H^(+)to2MnO_4^(-)+MnO_2+2H_2O`
(C )
(D) The colour of the complex ion is ATTRIBUTED to the presence of unpaired electron with is/are able to under go d-d transition in visible light. `Ti^(2+)` has two unpaired electrons. So, d-d transition electron is possible while `Ti^(4+)` has no electrons in the d-orbitals.
Discussion
20607.

The VA group element having more number of allotropes is

Answer»

N
P
Bi
Sb

Answer :B
Discussion
20608.

When ammonia is added to cupric salt solution, the deep blue colour formed is

Answer»

Due to DOUBLE SALT formed
Due to COMPLEX salt formed
Due to mixed salt formed
Due to basic salt formed

Answer :B
Discussion
20609.

What are the two factors which decide the physical state of a substance?

Answer»

Solution :(i) Ordering effect of COHESIVE FORCES and
(ii) disordering effect of THERMAL ENERGY.
Discussion
20610.

What is the advantage of using antihistamines over antacids in the treatment of acidity ?

Answer»

Solution :Antihistamines prevent the INTERACTION of histamine with the receptors present in STOMACH wall and thus lesser AMOUNT of HCL is released.
Discussion
20611.

Which of the followingstatement(s) is/are correct?

Answer»

`DELTAS` for the rearrangement of `(CH_(3))_(3)Coverset(+)(C)O` to `(CH_(3))_(3)overset(+)(C)`is positive
`(CH_(3))_(3) overset(+)(C)` is more stable than `(CH_(3))_(3) Coverset(+)(C)O`
It's an example of homogeneous catalysis
Solvent USED for FRIEDEL CRAFT acylation is

Solution :NA
Discussion
20612.

Which of the these can be distinguished by adding HCl or Na_(2)CO_(3)?

Answer»

`R-NH_(2)` and `R-Cl`

`CH_(3)CH_(2)OH` and `CH_(3)UNDERSET(OH) underset(|)(CH)CH_(3)`
`CH_(3)-underset(O) underset(||)(C)-CH_(3)` and `CH_(3)CH_(2)CHO`

SOLUTION :Not solution.
Discussion
20613.

Under Wolff Kischner reaction conditions, the coversation which may be brought about is

Answer»




ANSWER :D
Discussion
20614.

Why a mixture of NH_4Cl and NaNO_2 is heated instead of NH_4NO_2 for the preparation of nitrogen gas ?

Answer»

SOLUTION :`NH_4NO_2` is EXPLOSIVE in NATURE
Discussion
20615.

When the diluition increases by 100 times, the dissociation increases by 10 times.Justify that statement.

Answer»

Solution :(i) Let us consider an acid with `K_a` value `4 times 10^-14`. We are calculating the degree of dissociation of that acid at two different CONCENTRATION `1 times 10^-2 M` and `1 times 10^-14`M using Ostwaid.s dilution law.
`a=sqrt(K_a/C)`
(ii) For `1 times 10^-2 M` acid `a=sqrt((4 times 10^-4)/(1 times 10^-2))=sqrt(4 times 10^-2)=2 times 10^-1=0.2`
(III) For `1 times 10^-4 M` acid `a=sqrt((4 times 10^-4)/(1 times 10^-4))=sqrt4=2`
(iv) i.e., when the dilution increases by 100 times (concentration decreases from `1 times 10^-2M` to `1 times 10^-4M`) the dissociation increases by 10 times.
(v) When dilution increases, the degree of dissociation of weak electrolyte also INCREASE, (Ostwalsd.s dilution law).
Discussion
20616.

Which is sweet among known sugars,

Answer»

Sucrose
Fructose
Glucose
Lactose

Answer :B
Discussion
20617.

Which could not be obtained from wood :

Answer»

`CH_3OH`
`C_2H_5OH`
WOOL tar
Wood charcoal

Answer :B
Discussion
20618.

Vant Hoff's factor for a solution is less than one: What is the conclusion drawn from it ?

Answer»

Solution :It shows that the SOLUTE has undergone association in solution. For DETAILS,consult section 13.
Discussion
20619.

Which option is inconsistant for Raoult's law ?

Answer»

Volume of liquid SOLVENT + volume of liquid solute = volume of solution.
The CHANGE in heat of dilution for solution = 0.
Solute does not undergo association in solution.
Solute UNDERGOES DISSOCIATION in solution.

Answer :D
Discussion
20620.

Which of the following should be most volatile ?

Answer»

II
IV
I
III

Solution :Among the isomeric AMINES, TER. amines have the lowest b.p. due to absence of intermolecular hydrogen bonding.
thusoutof `CH_3 CH_2 CH_2NH_2 ` .
and `(CH_3)_3N, (CH_3)_3 N` is the most volatile. However, due to polar nature of C-N bonds `(CH_3)_2 N` is more polar than `CH_3 CH_2 CH_3`. Therefore, due to weak dipole-dipole interactions, `(CH_3)_3 N` has HIGHER boiling point or is less volatile than `CH_3 CH_2 CH_3`. Hence, `CH_3 CH_2 CH_3`is most volatile among the given COMPOUNDS.
Discussion
20621.

The volume of gas is reduced to half from its original volume. The specific heat will . .. .

Answer»

REDUCED to half
be doubled
remains constant
increase FOUR times

Solution :SPECIFIC heat is an intensive PROPERTY depending only on the nature of the GAS.
Discussion
20622.

Which characterises the weak intermolecular forces of attraction in a liquid ?

Answer»

HIGH boiling point
High VAPOUR pressure
High CRITICAL temperature
High HEAT of vaporisation

Answer :B
Discussion
20623.

Which of the following reactionwill be favoured by low pressure ?

Answer»

`H_2 + I_2 HARR 2HI`
`N_2+3H_2 harr 2NH_3`
`PCL_5 harr PCL_3+CL_2`
`N_2+O_2 harr 2NO`

ANSWER :C
Discussion
20624.

What type of solids are made by three dimensional arrangement of cations and anions bound by strong coulombic forces ?

Answer»

SOLUTION :IONIC SOLIDS
Discussion
20625.

Which ion is colourless ?

Answer»

`CU^+`
`NI^(2+)`
`CO^(2+)`
`Si^(2+)`

Answer :A
Discussion
20626.

Which of the following pairs of metals is puridied by Van-Arkel method?

Answer»

AG and Au
Ni and Fe
Ga and In
Zr and Ti

Answer :D
Discussion
20627.

Which alcohol gives red colour in Victor Meyer's test?

Answer»

`2^@` ALCOHOL
`3^@` alcohol
Phenol
`1^@` alcohol

SOLUTION :`1^@` alcohol
Discussion
20628.

Which soluton order is correct

Answer»

`BaSO_(4)ltSrSO_(4)ltCaSO_(4)ltMgSO_(4)`
`ZnSltNa_(2)Na_(2)SltCoS`
`BaCO_(3)ltMgCO_(3)ltNa_(2)CO_(3)`
`KOHltNaOHltMg(OH)_(2)`

ANSWER :D
Discussion
20629.

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH^(-) ion? (I) CH_3-underset(C_2H_5)underset(|)"CH"-Br (II) CH_3-underset(C_2H_5)underset(|)overset(Br)overset(|)C-CH_3 (III) CH_3-underset(C_2H_5)underst(|)(CH)CH_2Br

Answer»

(I)
(I),(II),(III)
(II),(III)
(I),(III)

Solution :In compound (I), Br is DIRECTLY ATTACHED to chiral C atom thus, will give racemic mixture on nucleophilic SUBSTITUTION `(S_N^1)` by `OH^(-)` ion.
Discussion
20630.

When 1.5 mol of a gas is heated at constant volume from 300 K to 350 K and the heat supplied to the gas is 750 J then the correct option is

Answer»

`q = DELTAU = 750 J, w = 0`
`q = w = 750 J, DeltaU = 0`
`q = w = 750 J, DeltaU = -750 J`
`q = 750 J, w = DeltaU = -750 J`

ANSWER :C
Discussion
20631.

Which of the following is a strongest base a weak nucleophile

Answer»

`CH_3O^-`
`CH_3CH_2O^-`
`(CH_3)_2CHO^- `
`(CH_3)_3CO^- `

Solution :Acidity of ALCOHOLS is in the ORDER `CH_3OH gt 1^@ gt 2^@ gt 3^@`HENCE `3^@`alcohol is WEAKLY acidic strongbasic hence is a weak nucleophilc
Discussion
20632.

Which functional group participates in the disulphide bond formation in proteins?

Answer»

Thioester
THIOETHER
Thiol
Thiolactone

ANSWER :C
Discussion
20633.

When 0.5 g of sulphur is burnt to SO_(2):4.6 kJ of heat is liberated. What is the enthalpy of formation of sulphur dioxide ?

Answer»

`-147.2 KJ`
`+147.2 kJ`
`+294.4 kJ`
`-294.4 kJ`

ANSWER :D
Discussion
20634.

Which pair shows a contractions in volume on mixing ?

Answer»

`CHCL_3` + `C_6H_6`
`H_2O` + HCL
`H_2O + HNO_3`
All

Answer :D
Discussion
20635.

Write the name, state of hybridization, shape and magnetic behaviour of the following complexes : [CoCl_(4)]^(2-), [Ni(CN)_(4)]^(2-), [Cr(H_(2)O)_(2)(C_(2)O_(4))_(2)]^(-) (At. Nos. : Co = 27, Ni = 28, Cr = 24)

Answer»

Solution :(i) `sp^(3)`, TETRAHEDRAL, paramagnetic (II) `dsp^(2)`, SQUARE PLANAR, DIAMAGNETIC (iii) `d^(2)sp^(3)`, octahedral, paramagnetic] (ii) `dsp^(2)`, square planar, diamagnetic (iii) `d^(2)sp^(3)`, octahedral, paramagnetic]
Discussion
20636.

Which of the following reagents are used in the conversion of

Answer»

`Mg // "dry ETHER"`
`HCHO // CrO_(3)`
`CO_(2) // H_(3)O^(+)`
`CH_(3)COOH`

Solution :
Discussion
20637.

Unit of electrochemical equivalent is _______.

Answer»

SOLUTION :gram/coulomb
Discussion
20638.

Vinegar is a dilute solution of_____.

Answer»

SOLUTION :ACETIC or ETHANOIC ACID.
Discussion
20639.

Whichof the followingis NOTa nucleophile?

Answer»

`BF_(3)`
`NH_(3)`
`CH_(3)CH_(2)NH_(2)`
`H_(2)O`

ANSWER :A
Discussion
20640.

When chlorobenzene is heated with copper powder in a sealed tube, it gives :

Answer»

BENZENE
DIPHENYL
NAPHTHALENE
phenol

Solution :
Discussion
20641.

Write outer electronic configuration of lanthanoids.

Answer»

SOLUTION :`4F^(1-14) 5D^(0-1) 6s^2`
Discussion
20642.

The vapour pressure of two pure liquids A and B are 200 and 400 tor respectively at 300K. A liquid solution (ideal) of A and B for which the mole fraction of A is 0.40 is contained in a cylinder. The composition of components A and B in vapour phase after equilibrium is reached between vapour & liquid phase, respectively is

Answer»

`X_A = 0.62`, `X_B = 0.38`
`X_A = 0.50`, `X_B = 0.50`
`X_A = 0.25`, `X_B= 0.75`
`X_A = 0.30`, `X_B= 0.70`

ANSWER :C
Discussion
20643.

Which of the following oxides reacts with both HCl and NaOH?

Answer»

`CaO`
`ZnO`
`N_2O_5`
`CO_2`

Solution :ZnO is AMPHOTERIC (SEE oxides)
Discussion
20644.

Using IUPAC norms write the formulas for the following: Potassium trioxalatochromate(III)

Answer»

Solution :`K_(3)[Cr(C_(2)O_(4)_(3)]`
Discussion
20645.

Which is the monomer of neoprene in the following?

Answer»

`CH_(2)=UNDERSET(CL)underset(|)C-CH=CH_(2)`
`CH_(2)=CH-C-=CH`
`CH_(2)=CH-CH=CH_(2)`
`CH_(2)=underset(CH_(3))underset("|")"C "-CH=CH_(2)`

SOLUTION :`CH_(2)=underset(Cl)underset(|)C-CH=CH_(2)`
Discussion
20646.

Which of the following reaction with (CH_(3)CH_(2))_(2)NH to give the compound? CH_(3)CH_(2)CH=CHN(CH_(2)CH_(3))_(2)

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)Br`
`CH_(3)CH_(2)-overset(O)overset(||)C-CH_(3)`
`CH_(3)-CH_(2)CH_(2)-overset(O)overset(||)C-H`
`CH_(3)CH_(2)CH_(2)-overset(O)overset(||)C-OH`

SOLUTION :`CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)C-H hArr CH_(3)-CH_(2)-CH=overset(OH)overset("|")"CH"+NH(CH_(3)CH_(2))_(2)overset(H_(3)O^(+))RARR CH_(3)-CH_(2)-CH=CH-N(CH_(2)CH_(3))_(2)`
Discussion
20647.

Which of the following act both as antipyretics and analgesics ?

Answer»

Aspirin
Paracetamol
Chloroxylenol
Seconal.

ANSWER :A
Discussion
20648.

which of the following are the names of cyclic ether?

Answer»

OXIRANE
Epoxyalkane
Alkene OXIDE
Carbinol

Answer :a,B,C
Discussion
20649.

What type of hybridization is associated with N in NH_3 ? What is the expected bond angle in NH_3 ?

Answer»

Solution :`sp^3` hydridization and expected ANGLE is `109.5^@`. However, actual BOND angle is `107^@` due to greater LONE PAIR-bond pair repulsion.
Discussion
20650.

When an ideal gas is suddenly allowed to expand adiabatically into an evacuated container, then

Answer»

`Delta S = 0`
`Delta G = 0`
`Delta U = 0`
`Delta G = - T Delta S`

SOLUTION :For adiabatic PROCESS, q = 0
For expansion against vacuum, W = 0
:. `Delta U = q + w = 0`
Discussion