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Thursday, November 25, 2021
A metal slowly forms an oxide film which completely protects the metal when the film thickness is 3.956 thousands of an inch. If the film thickness is 1.281 thousands. in 6 weeks, how much longer will it be before it is 2.481 thou? The rate of film formation follows first order kinetics.
Tuesday, November 23, 2021
Class Claperon equation:
Vapour pressure is directly proportional to the Temperature so that on increasing temperature the rate of evaporation increases and rate of condensation decreases and hence vapour pressure increases.
The dependence of vapour pressure and temperature is given by CLASIUS CLAPERON equation.
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Thursday, November 18, 2021
How many of the elements exist as gases at 25°c?
H,N,O, flourine (F), Chlorine (Cl),He, Neone (Ne) , Argone (Ar) kriptane (Kr) , Xenone (Xe) these are the elements found in gaseous state at 25℃ present in periodic table.(2) What are the Amphoteric metals ? gives Examples.
(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.
(5) What is atomic density ? give the periodicity of atomic density in periods and groups.
(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?
(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.
(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?
(9) The electron affinity of sulphur is greater than oxygen. Why?
Related Questions:
(1) Total numbers of elements which are liquid at normal temperature is ?
(2) What are the Amphoteric metals ? gives Examples.
(3) Name of total metalloids present in periodic table ?
(4) What is Mendeleev's periodic table ? give important features and draw back of Mendeleev's table.
(5) What is atomic density ? give the periodicity of atomic density in periods and groups.
(6) What is atomic volume ? and what is periodicity of atomic volume in groups and periods ?
(7) Why there are 2, 8 and 8 elements in first, second and third periodic of periods table respectively ? Explain.
(8) In alkali metal group which is the strongest reducing agent in aqueous solution and why?
(9) The electron affinity of sulphur is greater than oxygen. Why?
(10) The first ionization energy of carbon atom is greater than that of boron atom, whereas reverse is true for the second ionization energy. Explain.
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