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JEE Advanced ...

JEE Advanced Paper - 2 | 2016

Q. The correct statement(s) for cubic close packed (ccp) three dimensional structure is(are):

The number of the nearest neighbours of an atom present in the topmost layer is $12$
The efficiency of atom packing is $74 %$
The number of octahedral and tetrahedral voids per atom are $1$ and $2$ , respectively
The unit cell edge length is $2 \sqrt{2}$ times the radius of the atom

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Q. According to Molecular Orbital Theory:

$C_{2}^{2 -}$ is expected to be diamagnetic
$O_{2}^{2 +}$ is expected to have a longer bond length than $O_{2}$
$N_{2}^{+}$ and $N_{2}^{-}$ have the same bond order
$H e_{2}^{+}$ has the same energy as two isolated He atoms

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Q. Among the following, reaction(s) which gives(give) tert-butyl benzene as the major product is(are):

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Reagent(s) which can be used to bring about the following transformation is(are):

Raney $N i / H_{2}$ in THF
$N a B H_{4}$ in $C_{2} H_{5} O H$
$L i A l H_{4}$ in $(C_{2} H_{5})_{2} O$
$B H_{3}$ in THF

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Q. Extraction of copper from copper pyrite

(C u F e S_{2})

involves :

crushing followed by concentration of the ore by froth-flotation
removal of iron as slag
self-reduction step to produce 'blister copper' following evolution of $S O_{2}$
refining of 'blister copper' by carbon reduction

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Q. The correct order of acidity for the following compounds is:

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

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Q. Mixture(s) showing positive deviation from Raoult's law at

35^{o}

C is(are):

Carbon disulphide $+$ acetone
Carbon tetrachloride $+$ methanol
Benzene $+$ toluene
Phenol $+$ aniline

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Q. In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively, are:

S_{2} O_{3}^{2 -} A g^{+} - - \to X c l e a r s o l u t i o n A g^{+} - - \to Y w h i t e p r e c i p i t a t e with time - ---- \to Z b l a c k p r e c i p i t a t e

$[A g (S_{2} O_{3})_{2}]^{3 -}, A g_{2} S_{2} O_{3}, A g_{2} S$
$[A g (S_{2} O_{3})_{3}]^{5 -}, A g_{3} S O_{3}, A g_{2} S$
$[A g (S O_{3})_{z}]^{3 -}, A g_{2} S_{2} O_{3}, A g$
$[A g (S O_{3})_{3}]^{3 -}, A g_{2} S O_{4}, A g$

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Q. The major product of the following reaction sequence is:

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Q. The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of

K C l, C H_{3} O H

and

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

at room temperature.

The correct assignment of the sketches is:

$I : K C l; I I : C H_{3} O H; I I I : C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}$
$I : C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+} I I : C H_{3} O H; I I I : K C l$
$I : K C l; I I : C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}; I I I : C H_{3} O H$
$I : C H_{3} O H; I I : K C l; I I I : C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}$

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Q. For the following electrochemical cell at 298K,

P t (s) | H_{2} (g, 1 b a r) | H^{+} (a q, 1 M) | | M^{4 +} (a q), M^{2 +} (a q) | P t (s)

E_{c e l l} = 0.092

V when

\frac{[M^{2 +} (a q)]}{[M^{4 +} (a q)]} = 10^{x}

Given

: E_{M^{4 +} / M^{2 +}}^{0} = 0.151 V; 2.303 \frac{R T}{F} = 0.059 V

The value of x is :

$- 2$
$- 1$
$1$
$2$

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Q. The geometries of the ammonia complexes of

N i^{2 +}, P t^{2 +}

and

Z n^{2 +}

, respectively, are :

Octahedral, square planar and tetrahedral
Square planar, octahedral and tetrahedral
Tetrahedral, square planar and octahedral
Octahedral, tetrahedral and square planar

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