Question

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Answer 1

Ans 16) periscope - plane mirror, flood lights - convex, kaleidoscope - plane mirror, shaving mirror - concave Ans 14 :: the eating up of metals by the actions of air, moisture or a chemical on their surface is called corrosion. Formula - Fe2O3. xH2O

Answer 2

answer

14)Corrosion is the breakdown of materials due to chemical reactions. It is usually oxidation with air molecules and often in the presence of water.

formula of rust-Fe(2)O(3)

15.b)the product of this reactions are silver chloride (AgCl) and sodium nitrate (NaNO3)

16.1)convex mirror

2)concave mirror

3)convex mirror

4)convex mirror

17)Fertilizers are very expensive and their efficient use is of great importance to reduce the production cost of agricultural crops. It is essential that a maximum amount of fertilizer used during cultivation finds its way into the plant and that the minimum is  lost. Radioisotopes are very useful in estimating the amount of phosphorus and  nitrogen available in the soil.

18)Teflon is probably best-known for its role as the non-stick surface inside cookware. This is because PTFE industrial coating is one of the most slippery materials.

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