Question
What are extensive qualities and intensive qualities? Explain.

Answer

SELF

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The ionization constant of benzoic acid is $6.46 \times 10^{–5}$ and $K_{sp}$ for silver benzoate is $2.5 \times 10^{–13}$. How many times is silver benzoate more soluble in a buffer of $pH\ 3.19$ compared to its solubility in pure water?
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What do you understand by following?
  1. Dissociation constant of an acid.
  2. Buffer solution.
  3. Solubility product.
Match the species in Column I with the type of hybrid orbitals in Column II.
 
Column I
 
Column II
i.
Tetrahedral
a.
$\text{sp}^2$
ii.
Trigonal
b.
$\text{sp}$
iii.
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$\text{sp}^3$
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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Hint : Requirements for comparison purposes.
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Match Column I with Column II.
S. No Column I (Reaction) S. No Column II (Equilibrium constant)
1. $2\text{N}_2(\text{g})+6\text{H}_2(\text{g})\rightleftharpoons4\text{NH}_3(\text{g})$ (i) $2\text{K}_{\text{c}}$
2. $2\text{NH}_3(\text{g})\rightleftharpoons\text{N}_2(\text{g})+3\text{H}_2(\text{g})$ (ii) $\text{K}_{\text{c}}^{\frac{1}{2}}$
3. $\frac{1}{2}\text{N}_2\text{(g)}+\frac{3}{2}(\text{g})\rightleftharpoons\text{NH}_3(\text{g})$ (iii) $\frac{1}{\text{K}}$
4.   (iv) $\text{K}^2_{\text{c}}$
Give reasons:
Lakes freeze from top towards bottom.