When does ionisation of an atom of a transition element take place? Which electrons are removed first and why? Explain with suitable examples.
See Answer →Why is the reaction of XeF4 with water violent? Explain with the help of appropriate equations.
See Answer →Explain the structure of XeO3 on the basis of Valence Shell Electron Pair Repulsion (VSEPR) theory
See Answer →Write the names of the following oxoacids and deduce the oxidation number of halogen atom in each.
i). HOCl
ii) HOClO
iii) HOBr
iv) HOClO3
See Answer →What is the usual oxidation number of fluorine ? Why fluorine cannot have any excited state or any other oxidation number? What is the oxidation state of chlorine in and
Why are the bonds between S and O much shorter than expected for a single bond in its oxides?
See Answer →Describe the method of extraction of sulphur from native deposits. Illustrate your answer. Give the industrial uses of sulphur.
See Answer →Give reasons for the late discovery of noble gas compounds. Write the reaction of xenon trioxide with alkali solution
See Answer →Why fluorine is the stronger oxidsing agent among the halogens.
See Answer →Write the equations for the following:
i) sulphur is boiled with caustic soda solution.
ii) hydrogen sulphide gas is passed in aqueous solution of ferric chloride.
iii) sulphur dioxide gas is passed in aqueous solution of hydrogen sulphide gas.
iv) hydrogen peroxide is added to an acidified solution of potassium permanganate.
v) chlorine water is added to an aqueous solution of sodium thiosulphate
See Answer →What is the product formed in the reaction of nitric acid with metals. Compare it with the reaction with other metals
See Answer →What is the role of cryolite in the electrochemical reduction of alumina during the preparation of aluminium? Why the graphite anodes in this process have to be replaced from time to time?
See Answer →Giving reasons explain which of and
is most-basic.
Write the merits and demerits of hydrogen as a fuel.
See Answer →Graphite and diamond differ markedly in their hardness and electrical conductance
See Answer →Alkaline earth metals are denser and harder than alkali metals.
See Answer →Beryllium sulphate is soluble is water while barium sulphate is not
See Answer →The first ionization energy of copper is higher than that of potassium whereas the secondionization energy is in the opposite order
See Answer →Size of atoms in the periodic table does not increase with increasing atomic number
See Answer →Explain the principle of determining the age of organic materials using radioactive dating method
See Answer →