Question
Explain standard combustion enthalpy and atomisation enthalpy.

Answer

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2. Name three types of chromatography?
Explain the reason for the fusion of an organic compound with metallic sodium for testing nitrogen, sulphur and halogens.
Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II.
 
Column I
 
Column II
(i)
Two solids which have different solubilities in a solvent and which do not undergo reaction when dissolved in it.
(a)
Steam distillation.
(ii)
Liquid that decomposes at its boiling point.
(b)
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(iii)
Steam volatile liquid.
(c)
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(iv)
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(v)
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(e)
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1. Suggest a method to purify
i. a liquid which decomposes at its boiling point.
ii. kerosene oil containing water.
iii. camphor containing traces of common salt.
2. Giving justification, categorise the following molecules/ions as nucleophile or electrophile:
$
\begin{aligned}
& HS^{-}, BF_3, C_2 H_5 O^{-},\left(CH_3\right)_3 N:, \\
& C \stackrel{+}{l}, C H_3-\stackrel{+}{C}=O, H_2 N \stackrel{+}{:}, \stackrel{+}{N} O_2
\end{aligned}
$