Ozone is an allotrope of oxygen. The ozone layer present at the upper part of the atmosphere protects the earth’s surface from excess UV radiation. Why does `O_3` act as a strong oxidising agent?.

Ozone is an allotrope of oxygen. The ozone layer present at the upper part of the atmosphere protects the earth’s surface from excess UV radiation. Why does black lead sulphide become white, on treating with ozone?

Why does ozone act as a powerful oxidising agent?

In which part of atmosphere, ozone layer is present? (1)Stratosphere (2)Troposphere (3)Mesosphere (4)Thermosphere

"Ozone layer does not permit infrared radiation from the sun to reach the earth". State whether this statement is true or false.

a) Identify redox reaction from the following reactions. i) Evaporation of water. ii) Conversion of oxygen to ozone in the upper atmosphere. iii) Formation of nitric oxide from nitrogen and oxygen during lightning. iv) Reaction of 'NaOH' with 'H_2 SO_4' b) Balance the following equation by oxidation number method. 'Fe^(2+)+Cr_2 O_7^(2-)+H^+ rarr F e^(3+)+Cr^(3+)+H_2 O'

Explain i) ozone layer acts as an umbrella for the earth against the harmful radiation from sun. ii) The wooden shelf under thé reagent bottle containing conc. H_2 SO_4 blackens after sometime. iii Precipitation of secònd group sulphides in qualitative analysis is càrried out with H_2 S in presence of HCl and not nitric acid.

Why does the following reaction occur? XeO_6^(4-) (aq) + 2F^(-) (aq) +6H^(+) (aq) rarr XeO_3 (s) + F_2(g) + 3H_2O(I) , What conclusion about the compound Na_4XeO_6 (of which XeO_6^(4-) is a part) can be drawn from the reaction?