Match the following substances with their respective uses: a) Iodine — i) Water Purification b) Mercury — ii) Antiseptic on wounds c) Aluminum — iii) Thermometers d) Chlorine — iv) Food packaging

The non-metal used in the purple-coloured solution applied on wounds as an antiseptic is:

To explain why 'Sodium and Potassium are stored in kerosene', the following reasons were suggested by Class VIII students: A. Both are highly reactive and react with carbon dioxide in the atmosphere. B. Both are highly toxic and give off toxic fumes. C. Both are highly reactive and react vigorously with oxygen and moisture in the atmosphere. D. Kerosene helps cut off the contact of these metals with air and moisture. Select the most appropriate reasons from the options below: