Question
Classify the elements on basis of electronic configuration.

Answer

SELF

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Why is Wurtz reaction not preferred for the preparation of alkanes containing odd number of carbon atoms? Illustrate your answer by taking one example.
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$\Delta_{\text {fus }} H=6.03 kJ mol^{-1} \text { at } 0^{\circ} C .$
$C_{p}\left[H_2 O(l)\right]=75.3 J mol^{-1} K^{-1}$
$C_{p}\left[H_2 O(s)\right]=36.8 J mol^{-1} K^{-1}$
$50.0g$ of $CaCO_3$ are heated to 1073K in a $5L$ vessel. What per cent of the $CaCO_3$ would decompose at equilibrium? $K_p$ for the reaction.
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The concentration of sulphide ion in $0.1$ M HCl solution saturated with hydrogen sulphide is $1.0 \times 10^{-19} \mathrm{M}$. If $10$ mL of this is added to $5$ mL of $0.04$ M solution of the following: $\mathrm{FeSO}_4, \mathrm{MnCl}_2, \mathrm{ZnCl}_2$ and $\mathrm{CdCl}_2$. in which of these solutions precipitation will take place?
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 The ionization constant of $HF , HCOOH$ and HCN at 298 K are $6.8 \times 10^{-4}, 1.8 \times 10-4$ and $4.8 \times 10^{-9}$ respectively. Calculate the ionization constants of the corresponding conjugate base.
How is a covalent bond formed? Explain the rules of covalent bond formation with examples.
Sodium carbonate, $Na_2CO_3$ can be obtained by heating sodium hydrogen carbonate, $NaHCO_3​​​​​​​$​​​​​​​ as $2NaHCO_3(s) → Na_2CO_3(s) + H_2O(g) + CO_2(g).$
The essential data are,
 
$NaHCO_3(s)$
$Na_2CO_3(s)$
$CO_2(g)$
$H_2O(g)$
$\ \ \ \ \Delta_\text{f}\text{H}^\circ\$\text{kJ mol}^{-1})$
$-947.7$
$-1130.9$
$-393.51$
$-241.82$
$\ \ \ \ \ \text{S}^\circ_\text{m}\$\text{J mol}^{-1})$
$102.1$
$136$
$188.83$
$213.74$
Calculate the temperature above which $NaHCO_3$ decomposes to give products at 1 bar.