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Question Papers

JEE Advanced ...

JEE Advanced Paper 2 | 2012

Q. The reaction of white phosphorus with aqueous

N a O H

gives phosphine along with another phosphorus containing compound. The reaction type, the oxidation states of phosphorus in phosphine and the other product are respectively:

redox reaction; $- 3$ and $- 5$
redox reaction; $+ 3$ and $+ 5$
disproportionation reaction; $- 3$ and $+ 5$
disproportionation reaction; $- 3$ and $+ 3$

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Q. The major product

H

of the given reaction sequence is:

C H_{3} - C H_{2} - CO - C H_{3}^{⊖} CN - -- \to G 95% H_{2} S O_{4} - ------ \to Heat H

$C H_{3} - C H = C | C H_{3} - C O O H$
$C H_{3} - C H = C | C H_{3} - C O - N H_{2}$
$C H_{3} - C H = C | C H_{3} - C N$
$C H_{3} - C H_{2} - O H | C | C H_{3} - C O O H$

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Q. The shape of

X e O_{2} F e

molecule is

Tetrahedral
Trigonal bipyramidal
Square planar
See-saw

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Q. In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are:

$O_{2}$ and $C O$ , respectively
$O_{2}$ and $Z n$ dust, respectively
$H N O_{3}$ and $Z n$ dust, respectively
$H N O_{3}$ and $C O$ , respectively

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Q. The compound that undergoes decarboxylation most readily under mild condition is __________.

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Q. Bleaching powder and bleach solution are produced on a large scale and is used in several house-hold products. The effectiveness of bleach solution is often measured by iodometry. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is:

$C l_{2} O$
$C l_{2} O_{7}$
$C l O_{2}$
$C l_{2} O_{6}$
$C l_{3} O_{5}$
$C l_{2} O_{3}$
$C l_{2} O_{5}$
$C l_{3} O_{9}$

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[N i C l_{2} {P (C_{2} H_{5})_{2} (C_{6} H_{5})}_{2}]

exhibits temperature dependent magnetic behaviour (paramagnetic/ diamagnetic). The coordination geometries of

N i^{2 +}

in the paramagnetic and diamagnetic states are respectively:

square planar and square planar
square planar and tetrahedral
tetrahedral and tetrahedral
tetrahedral and square planar

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Q. Using the data provided, calculate the multiple bond energy

(k J m o l^{- 1})

of a

C \equiv C

bond in

C_{2} H_{2}

. That energy is:

(take the bond energy of a

C - H

bond as 350

k J m o l^{- 1}

)

\begin{matrix} 2 C (s) + H_{2} (g) \to C_{2} H_{2} (g); Δ H = 225 k J m o 1^{- 1} 2 C (s) \to 2 C (g); Δ H = 1410 k J m o 1^{- 1} H_{2} (g) \to 2 H (g); Δ H = 330 k J m o 1^{- 1} \end{matrix}

$837$
$1165$
$865$
$815$

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Q. For a dilute solution containing

2.5 g m

of a non-volatile non-electrolyte solute in

100 g m

of water, the elevation in boiling point at

1 a t m

pressure is

2^{o} C

. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of

H g

) of the solution is (

K_{b} = 0.76 K k g m o l^{- 1})

$740$
$736$
$724$
$718$

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Q. Bleaching powder and bleach solution are produced on a large scale and is used in several house-hold products. The effectiveness of bleach solution is often measured by iodometry.

25 m l

of household bleach solution was mixed with

30 m l

0.50 M

K I

and

10 m l

4 N

acetic acid. In the titration of the liberated iodine,

48 m l

0.25 N

N a_{2} S_{2} O_{3}

was used to reach the end point. The molarity of the household bleach solution is:

$0.96 M$
$0.024 M$
$0.48 M$
$0.24 M$

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