Explain the half reaction method (ionelectron method) to balance … - Vidyadip

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Explain the half reaction method (ionelectron method) to balance the redox reaction with example.

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1. During estimation of nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.5 g of the compound in Kjeldahl's estimation of nitrogen, neutralized 10 mL of $1 M H _2 SO _4$. Find out the percentage of nitrogen in the compound.
2. Explain why $\left( CH _3\right)_3 \stackrel{+}{ C }$ is more stable than $CH _3 \stackrel{+}{ C } H _2$ and $\stackrel{+}{ C } H _3$ is the least stable cation.

Balance the following reactions by ion electron method :
(a) $MnO _4^{-}+ H ^{+}+ Fe ^{2+} \longrightarrow Mn ^{2+}+ Fe ^{3+}+ H _2 O$
(b) $Cr _2 O _7^{2-}+ H ^{+}+ I ^{-} \longrightarrow Cr ^{3+}+ I _2+ H _2 O$

Calculate the equilibrium constant for the following equilibrium system at 1120K.

$\text{C}(\text{s})+\text{CO}_2(\text{g})+2\text{Cl}_2\stackrel{\text{K}_\text{p}}{\rightleftharpoons}2\text{COCl}_2(\text{g})$

Given the following equations and equilibrium constants:

$\text{CO}(\text{s})+\text{Cl}_2(\text{g})\rightleftharpoons\text{COCl}_2(\text{g})$

$\text{Kp}_1 = 6.0 \times 10-3 \dots(1)$

$\text{CO}(\text{s})+\text{Cl}_2(\text{g})\rightleftharpoons\text{CO}_2(\text{g})$

$\text{Kp}_2 = 1.3 \times 1014 \dots(2)$

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What type of intermediate species are formed by homolytic fission?
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In Kjeldahl's method, which compound is formed during digestion i.e., reaction of organic compound with conc. H₂SO₄ on heating?
Why is HCOOH more acidic than CH₃COOH?

What is buffer solution? How many types of buffer solution are there? Explain with examples.

What are Lewis acids and Lewis bases? Explain with different types of examples.

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.

The work function for caesium atom is 1.9 eV . Calculate (a) the threshold wavelength and (b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm , calculate the kinetic energy and the velocity of the rejected photoelectron.