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Question Papers

JEE Advanced ...

JEE Advanced Paper 2 | 2017

Q. The correct statement(s) about surface properties is (are):

cloud is an emulsion type of colloid in which liquid is dispersed phase and gas is dispersion medium
adsorption is accompanied by decrease in enthalpy and decrease in entropy of the system
the critical temperatures of ethane and nitrogen are $563 K$ and $126 K$ , respectively. The adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature
brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solution

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Q. Pure water freezes at

273 K

and

1 b a r

. The addition of

34.5 g

of ethanol to

500 g

of water changes the freezing point of the solution. Use the freezing point depression constant of water as

2 K k g m o l^{- 1}

. The figures shown below represent plots of vapour pressure (V.P.) versus temperature (T). [molecular weight of ethanol is 46

g m o l^{- 1}

]
Among the following, the option representing change in the freezing point is:

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Q. The standard state Gibbs free energies of formation of

C_{(g r a p h i t e)}

and

C_{(d i a m o n d)}

T = 298 K

are

Δ_{f} G^{\circ} C_{(g r a p h i t e)} = 0 k J m o l^{- 1}

Δ_{f} G^{\circ} C_{(d i a m o n d)} = 2.9 k J m o l^{- 1}

The standard state means that the pressure should be

1 b a r

, and substance should be pure at a given temperature. The conversion of graphite

C_{(g r a p h i t e)}

to diamond

C_{(d i a m o n d)}

reduces its volume by

2 \times 10^{- 6} m^{3} m o l^{- 1}

. If

C_{(g r a p h i t e)}

is converted to

C_{(d i a m o n d)}

isothermally at

T = 298 K

, the pressure at which

C_{(g r a p h i t e)}

is in equilibrium with

C_{(d i a m o n d)}

, is?

[Useful information:

1 J = 1 k g m^{2} s^{- 2}; 1 P a = 1 k g m^{- 1} s^{- 2}; 1 b a r = 10^{5} P a]

$29001 b a r$
$14501 b a r$
$1450 b a r$
$58001 b a r$

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Q. The major product of the following reaction is:

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Q. The order of the oxidation state of the phosphorus atom in

H_{3} P O_{2}, H_{3} P O_{4}, H_{3} P O_{3}

, and

H_{4} P_{2} O_{6}

is:

$H_{3} P O_{4} > H_{3} P O_{2} > H_{3} P O_{3} > H_{3} P_{2} O_{6}$
$H_{3} P O_{4} < H_{3} P O_{2} < H_{3} P O_{3} < H_{3} P_{2} O_{6}$
$H_{3} P O_{2} > H_{3} P O_{3} > H_{4} P_{2} O_{6} > H_{3} P O_{4}$
$H_{3} P O_{4} > H_{4} P_{2} O_{6} > H_{3} P O_{3} > H_{3} P O_{2}$

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Q. For the following cell,

Z n (s) | Z n S O_{4} (a q) ∥ C u S O_{4} (a q) | C u (s)

, when the concentration of

Z n^{2 +}

10

times the concentration of

C u^{2 +}

, the expression for

△ G

(in

J m o l^{- 1}

) is:

[

F

is Faraday constant;

R

is gas constant;

T

is temperature;

E^{\circ} (c e l l) = 1.1 V]

$2.303 R T - 2.2 F$
$2.303 R T + 1.1 F$
$1.1 F$
$- 2.2 F$

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Q. In a bimolecular reaction, the steric factor

P

was experimentally determined to be

4.5

. The correct option(s) among the following is (are):

Experimentally determined value of frequency factor is higher than that predicted by Arrhenius equation.
The value of frequency factor predicted by Arrhenius equation is higher than that determined experimentally.
The activation energy of the reaction is unaffected by the value of the steric factor.
Since $P = 4.5$ , the reaction will not proceed unless an effective catalyst is used.

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Q. The order of basicity among the following compounds is:

$I I > I > I V > I I I$
$I > I V > I I I > I I$
$I V > I > I I > I I I$
$I V > I I > I I I > I$

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Q. The option(s) with only amphoteric oxides is (are):

$C r_{2} O_{3}, B e O, S n O, S n O_{2}$
$C r_{2} O_{3}, C r O, S n O, P b O$
$Z n O, A l_{2} O_{3}, P b O, P b O_{2}$
$N O, B_{2} O_{3}, P b O, S n O_{2}$

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Q. For the following compounds, the correct statement(s) with respect to nucleophilic substitution reactions is (are):

I and III follow $S_{N} 1$ mechanism
Compound IV undergoes inversion of configuration
I and II follow $S_{N} 2$ mechanism
The order of reactivity for I, III and IV is: $I V > I > I I I$

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Q. Which of the following combination will produce

H_{2}

gas?

$A u$ metal and $N a C N (a q)$ in the presence of air
$C u$ metal and $c o n c . H N O_{3}$
$F e$ metal and $c o n c . H N O_{3}$
$Z n$ metal and $N a O H (a q)$

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Q. Among the following, the correct statement(s) is (are):

$B H_{3}$ has the three-centre two-electron bonds in its dimeric sturcture
$A l (C H_{3})_{3}$ has the three-centre two-electron bonds in its dimeric structure
$A l C l_{3}$ has the three-centre two-electron bonds in its dimeric structure
The Lewis acidity of $B C l_{3}$ is greater than that of $A l C l_{3}$

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