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Posted by Saurav Chavda 5 years, 4 months ago
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Nitin Sharma 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
The discovery of the proton is credited to Ernest Rutherford, who proved that the nucleus of the hydrogen atom (i.e. a proton) is present in the nuclei of all other atoms in the year 1917.
Posted by Harsh Singh 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The compound of on halogen with the other halogen is called inter halogen compounds.
They are formed due to large electro negativity and size difference between halogens.
Let’s take an example: Let’s assume two halogens A and B.
B is more electronegative than A then they will form four types of compounds:
- AB example: ClF (Chlorine monofluoride),BrF(Bromine monofluoride).
- AB3 example: ClF3 (Chlorine trifluoride), BrF3 (Bromine trifluoride).
- AB5 example: BrF5 (Bromine pentafluoride).
- AB7 example: IF7 (iodine heptafluoride).
Reeta Jangra 5 years, 4 months ago
Posted by Aparna Mehra 5 years, 4 months ago
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Posted by Muhammed Midlaj Muneer.C 5 years, 4 months ago
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Posted by Sandhya Bhandari 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
The compounds containing a carbonyl group (the -C=O group) are called carbonyl compounds. The carbonyl group, C=O, is probably the most important functional group in organic chemistry. These compounds are an integral part of organic chemistry and their primary members are called aldehydes, ketones, and carboxylic acids.
Posted by Nana Li 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Given:
Edge length of unit cell = 400pm = cm
Atomic mass of the element = 60
Volume of unit cell =
To find:
Density of the element = ?
Formula to be used:
Calculation:
Unit cell mass =
Number of atoms in the unit cell =
Number of atom in fcc unit cell =
Number of atom in fcc unit cell = 4
Mass of one atom =
Mass of one atom =
Mass of four atom =
Density of unit cell =
Density of unit cell =
Conclusion:
The density of the element is found to be
Posted by Nana Li 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The density is given by the formula z*M/a3*NA
Given a = 405ppm, Density ρ = 27gcm−3 and Molar mass = 27 g/mol, we need to determine z.
Avagadro's number Na =6.022 × 1023 /mol
⇒{tex}z = ρa^3Na/M =[ 27×(405×10^−10)^3 ×6.022×10^23] / 27 = 4{/tex}
⇒z = 4→ that the unit cell is a face-centered cube.
Posted by Nana Li 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
There are 4 atoms per unit cell of lattice
Density = mass / volume
= 4× mass of each atom/ a3 , where a side of cubic unit cell
= 4× 60.2 × 1.66 × 10 -24 / a3 as atomic mass = 1.66× 10 -24 g
= 6.25 g/cm3 given
so a3 = 4×60.2 × 1.66 ×10-24 / 6.25 cm3
Gives a3 = 6.39 × 10 -23 cm3 = = 63.9× 10 -24
Find a from here
a = 3.93x 10 -8 cm
Posted by Kartik Rastogi 5 years, 4 months ago
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Mahendra Jat 5 years, 4 months ago
Posted by Anushka Shrivastava 4 years, 8 months ago
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Sia ? 4 years, 8 months ago
An oxyanion, or oxoanion, is an ion with the generic formula A. xO z− y (where A represents a chemical element and O represents an oxygen atom). Oxyanions are formed by a large majority of the chemical elements.
Posted by Yeshi Palmo 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
What will happen to the boiling point of a solution if mass of the solute dissolved is doubled and that of the solvent taken is halved ?
ans
Now, if WB is doubled and WA is halved, the value of △Tb will becomes four times the original value.
Posted by Vishal Kumar 5 years, 4 months ago
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Bhawna Sangwan 5 years, 4 months ago
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Arif Khan 5 years, 4 months ago
Vishal Kumar 5 years, 4 months ago
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Khushi Rao 5 years, 4 months ago
Posted by Jay Patidar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The state of an ideal gas is determined by the macroscopic and microscopic parameters like pressure, volume, temperature.
Thus, the ideal gas equation is often written as:
| <center>PV = nRT</center> |
Where,
- P is the pressure of the ideal gas.
- V is the volume of the ideal gas.
- n is the amount of ideal gas measured in terms of moles.
- R is the gas constant.
- T is the temperature.
Posted by Ritika Singh 5 years, 4 months ago
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Khushi Rao 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
The anionic sites occupied by unpaired electrons are called F-centres (from the German word Farbenzenter for colour centre). Such defects also impart color to the crystals. The color results by excitation of these electrons when they absorb energy from the visible light falling on the crystals. For example, impart yellow color to the crystals of NaCl.
Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Main sources of iodine:–
Due to its reactivity iodine is not found in nature in free state
Its main sources are -
(i) Sea weeds
(ii) Chile salt peter
(iii) Natural brine
Extraction of Iodine from sea weeds – Sea weed, lamineria contains iodine. Sea weed is well dried and burnt in deep pits carefully so that iodine do not get destroyed. The obtained ash is called kalp, which contains 0.4 to 1.3% iodine. Kelp is dissolved in water and solution is partially crystalised when less soluble KI and NaI remain in the mother liquor. Conc H2SO4 is added when basic sulphides deposit at the bottom, which is filtered and removed. Now the filtrate is mixed with MnO2 and conc. H2SO4 and heated in an iron vessel. Iodine vapourises due to the reaction and is collected in “Aludel”, Iodine is now collected as solid after condensation.
Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
alcium carbide (CaC2CaC2) reacts with water to produce acetylene (C2H2C2H2):
CaC2(s) + 2H2O(g) ⇋ Ca(OH)2(s) + C2H2(g)
Production of 13 g of C2H2C2H 2requires consumption of _____ g of H2OH2O.
Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
of methane gas and sodium carbonate. This type of reaction is called as decarboxylation reaction and as the name suggests there is a loss of a molecule of carbon dioxide from sodium acetate.This then facilitates in the formation of methane gas.
Methane gas is used as natural fuel.
The reaction which takes place is as follows:
+
+
Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The extraction of the metal from bauxite involves the three main steps.
- Concentration of Bauxite (Al2O3.2H2O)
Concentration of ore is done by leaching which helps in removing impurities like Fe2O3,SiO2, etc. Bauxite is treated with NaOH to form sodium aluminate which on further reaction with CO2 gives pure Alumina.
Al2O3+2NaOH+3H2O⟶2Na[Al(OH)4]2CO2−2NaHCO3Al2O3.xH2OΔ1470KPure aluminaAl2O3+xH2O
- Electrolytic reduction of Alumina (Al2O3)
Electrolytic reduction of pure alumina takes place in iron box (cathode) with cryolite (Na3AlF6) and fluorspar (CaF2) which lowers the melting point and increases the conductivity of electrolyte. Graphide rods act as anode.
At cathode:-
Al3++3e−⟶Al
At anode:- The oxygen liberated at anode reacts with the carbon of anode to produce CO and CO2.
C+O2−⟶CO+2e−
C+2O2−⟶CO2+4e−
By this process 98.8% pure aluminium is obtained.
Posted by Dharamveer Kumar 5 years, 4 months ago
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Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Colligative property depends on the no. of solute particles irrespective of their nature relative to the total no. of particles present in the solution.
Osmotic pressure depends upon the no. of particles of solute, i.e., molarity of solute.
Hence osmotic pressure is a colligative property.
Posted by Dharamveer Kumar 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Nucleic acids are long-chain polymeric molecules, the monomer (the repeating unit) is known as the nucleotides and hence sometimes nucleic acids are referred to as polynucleotides.
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Gaurav Seth 5 years, 4 months ago
Freundlich adsorption Isotherm:
If there are solutions involved, the above equations become
Where x -> amount of adsorbate
m-> mass of adsorbent
p-> pressure
C-> concentration of adsorbate
K and n->constants , n>1 always
Looking at equation 2, as we plot log x/m versus log p on a graph, we get a straight line with slope=1/n and y- intercept= log k.
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