PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Give the laws for IUPAC nomenclature of organic compounds have multiple groups and give examples.

Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate Ca₃(PO₄)₂.

Graphically show the total work done in an expansion when the state of an ideal gas is changed reversibly and isothermally from (p_i, V_i ) to (p_f, V_f ). With the help of a pV plot compare the work done in the above case with that carried out against a constant external pressure p_f.

What are solubility and solubility products? Derive the relationship between them.

Why is benzene extra ordinarily stable though it contains three double bonds?

Briefly describe the valence bond theory of covalent bond formation by taking an example of hydrogen. How can you interpret energy changes taking place in the formation of dihydrogen?

Determine the solubilities of silver chromate, barium chromate, ferric hydroxide, lead chloride and mercurous iodide at 298K from their solubility product constants given in Table 7.9. Determine also the molarities of individual ions.

On the basis of quantum numbers, justify that the sixth period of the periodictable should have 32 elements.

Determine the empirical formula of an oxide of iron, which has 69.9% iron and 30.1% dioxygen by mass.