Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.

For a reaction R → P, half-life (t_1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?

Write one similarity between Physisorption and Chemisorption?

Complete the following reactions :
NH₃ + 3Cl₂(excess) →

Complete the following reactions :
XeF₆ + 2H₂O → 

What happens when
(NH₄)₂Cr₂O₇ is heated?

What happens when
H₃PO₃ is heated?

Define the following terms:
Colligative properties

Define the following terms:
Molality (m)

Draw the structures of the following :
H₂S₂O₇