Question 14 Marks
Total number of non bonded electrons present in $NO _2^{-}$ion based on Lewis theory is _________ .
Answer
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Questions
SECTION - B [CHEMISTY - NUMERIC]
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Question 24 Marks
In the sulphur estimation, 0.20 g of a pure organic compound gave 0.40 g of barium sulphate. The percentage of sulphur in the compound is _________ $\times 10^{-1} \%$.
(Molar mass : $O =16, S=32, Ba =137$ in $g mol ^{-1}$ )
(Molar mass : $O =16, S=32, Ba =137$ in $g mol ^{-1}$ )
Answer
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Sol.
Sol.
Question 34 Marks
In the Claisen-Schmidt reaction to prepare, dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was _________ \%.
Answer
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$\begin{array}{l}\text { Theoretical }=\frac{1}{40} Mol \\ \% \text { yield }=\frac{0.015}{1 / 40} \times 100 \\ \Rightarrow 60 \%\end{array}$
$\begin{array}{l}\text { Theoretical }=\frac{1}{40} Mol \\ \% \text { yield }=\frac{0.015}{1 / 40} \times 100 \\ \Rightarrow 60 \%\end{array}$
Question 44 Marks
Isomeric hydrocarbons $\rightarrow$ negative Baeyer's test (Molecular formula $C _9 H _{12}$ )
The total number of isomers from above with four different non-aliphatic substitution sites is -
The total number of isomers from above with four different non-aliphatic substitution sites is -
Answer
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Above two isomers of $C _9 H _{12}$ have four different sites for aromatic electrophilic substitution reaction.
Above two isomers of $C _9 H _{12}$ have four different sites for aromatic electrophilic substitution reaction.
Question 54 Marks
Consider the following low-spin complexes$
\begin{array}{l}
K_3\left[Co\left(NO_2\right)_6\right], K 4\left[Fe(CN)_6\right], K_3\left[Fe(CN)_6\right] \\
Cu_2\left[Fe(CN)_6\right] \text { and } Zn 2\left[Fe(CN)_6\right] .
\end{array}
$
The sum of the spin-only magnetic moment values of complexes having yellow colour is _________
B.M. (answer is nearest integer)
\begin{array}{l}
K_3\left[Co\left(NO_2\right)_6\right], K 4\left[Fe(CN)_6\right], K_3\left[Fe(CN)_6\right] \\
Cu_2\left[Fe(CN)_6\right] \text { and } Zn 2\left[Fe(CN)_6\right] .
\end{array}
$
The sum of the spin-only magnetic moment values of complexes having yellow colour is _________
B.M. (answer is nearest integer)
Answer
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