Question
Explain geometrical isomerism with the help of suitable example.

Answer

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Determine the degree of ionization and pH of a 0.05 M of ammonia solution. The ionization constant of ammonia can be taken from table given below.
Base$K _{ b }$
Dimethylamine, $\left( CH _3\right)_2 NH$$5.4 \times 10^{-4}$
Triethylamine, $\left( C _2 H _5\right)_3 N$$6.45 \times 10^{-5}$
Ammonia, $NH _3$ or $NH _4 OH$$1.77 \times 10^{-5}$
Quinine, (A plant product)$1.10 \times 10^{-6}$
Pyridine, $C _5 H _5 N$$1.77 \times 10^{-9}$
Aniline, $C _6 H _5 NH _2$$4.27 \times 10^{-10}$
Urea, $CO \left( NH _2\right)_2$$1.3 \times 10^{-14}$
Also, calculate the ionization constant of the conjugate acid of ammonia.
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How do atomic radius vary in a period and in a group? How do you explain the variation?
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 The solubility product of lead bromide is $8 \times 10^{-5}$ at 298 K . If the salt is $80 \%$ dissociated in saturated solution, calculate the solubility of the salt (in $g / L$ ).
  1. Derive the mathematical expression for first law of thermodynamics.
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$\mathrm{H}_2(\mathrm{~g})+\mathrm{Br}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HBr}(\mathrm{~g})$
Bond enthalpy are given as, $\mathrm{H}-\mathrm{H}=436 \mathrm{~kJ} \mathrm{~mol}^{-1}, \mathrm{Br}-\mathrm{Br}=192 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\mathrm{H}-\mathrm{Br}=368 \mathrm{~kJ} \mathrm{~mol}^{-1}$
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