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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?
(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?
Monday, November 15, 2021
Liquid A and B forms an ideal solution and initial vapour pressure of A and B are P°A= 0.4 atm and P°A= 0.6 atm respectively. In a cylinder piston arrangement, 2 mole vapour of A and 3 mole vapour of B is collected at 0.42 atm.
(1) predict wheather the vapour will condense or not ?
(2) If the vapours are compared slowly and isothermally at what pressure F drop of liquid will form?
(3) If initial volume of vapour was 10 litre , at what volume first drop of liquid is form?
(4) What is the composition of first drop of liquid formed?
(5) If vapour pressure are further compressed. At what pressure almost complete condensation of vapour will occure?
(6) Determine the composition of last traces of vapours remains?
(7) What is the composition of system at 0.55 atm pressure?
(8) Determine the composition of liquid and vapour formed at 0.51 atm also calculate the moles of liquid of A and B in liquid and vapour formed ?
(9) At what pressure half of the total amount of vapour will condense?
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Sunday, November 14, 2021
Vapour pressure of a solution containing 6 gm of non volatile solute in 180 gm of water is 20 torr/mmHg. If 1 mole of water is further added in to the V.P. increases by 0.02 torr. calculate the V.P. of pure water and molecular wt of the non volatile solute.
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