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Sia ? 6 years, 6 months ago
- For an electron, the energies in two orbits may be compared as:
{tex}\frac{E_{1}}{E_{2}}=\left(\frac{n_{2}}{n_{1}}\right)^{2}{/tex}
According to available data: n1 = 1,E1 = - 2.17 {tex}\times{/tex} 10-18 J atom-1, n2 = 5
{tex}\therefore{/tex} {tex}\frac{\left(-2.17 \times 10^{-18} \mathrm{J} \text { atom }^{-1}\right)}{\mathrm{E}_{2}}=\left(\frac{5}{1}\right)^{2}{/tex} = 255
E5 = {tex}\frac{\left(-2.17 \times 10^{-18} \mathrm{J} \text { atom }^{-1}\right)}{25}{/tex}= -8.77 {tex}\times{/tex} 10-20 J - For hydrogen atom rn = 0.529 {tex}\times{/tex} n2 {tex}\stackrel{\circ}{A}{/tex}
r5 = 0.529 {tex}\times{/tex} (5)2 = 13.225 {tex}\stackrel{\circ}{A}{/tex} = 1.3225 nm
Posted by Vivek Dahiya 6 years, 6 months ago
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An electrostatic precipitator (ESP) is defined as a filtration device that is used to remove fine particles like smoke and fine dust from the flowing gas. It is the commonly used device for air pollution control. They are used in industries like steel plants, thermal energy plants.
In the year 1907, chemistry professor Frederick Gardner Cottrell patented the first electrostatic precipitator that was used to collect sulphuric acid mist and lead oxide fumes that were emitted from various acid-making and smelting activities.
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Sia ? 6 years, 6 months ago
Lyman series, n = 2, 3, 4... to n= 1
For short wavelength, n ={tex}\infty{/tex} to n = 1
we know that ,
{tex}E = \frac { 12375 } { \lambda ( \mathop A\limits_{}^o ) } = \frac { 12375 } { 9134 } \mathrm { eV } = 13.54 \mathrm { eV }{/tex}
Energy of nth orbit, E = 13.54/n2
So, energy of n = 1, energy level = 13.54eV
Energy of n = 2, energy level= 13.54/22 = 3.387 eV
So, short wavelength of Balmer series = {tex}\frac { 12375 } { 3.387 }{/tex} = 3653 {tex}\mathop A\limits_{}^o {/tex}
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Carboxylic Acids:Carboxylic acids are the compounds containing the carboxylfunctional group (-COOH).
- Preparation of carboxylic acid:
(i) From alcohols: Primary alcohols are readily oxidised to carboxylic acids with common oxidising agents such as potassium permanganate (KMnO4) in neutral, acidic or alkaline media or by potassium dichromate (K2Cr2O7) and chromium trioxide (CrO3) in acidic media.
(iii) From alkylbenzenes: Aromatic carboxylic acids can be prepared by vigorous oxidation of alkyl benzenes with chromic acid or acidic or alkaline potassium permanganate.
(vi) From Grignard reagent: Grignard reagents react with carbon dioxide (dry ice) to form salts of carboxylic acids which on hydrolysis forms carboxylic acids.
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N2 is exist as diatomic molecule in which two nitrogen atoms are attached to each other by triple bond this triple bond is due to p(pie)-p(pie) multiple bonding (sidewise overlapping) and such bonding is not possible in phosphorus due to it's large size but possible in nitrogen due to it's small size.
In case of phosphorus four atoms are associated so it have high molecular mass ,large magnitude of venderwall forces so phosphorus is solid and nitrogen is gas.
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