For a good crop, the pH value of soil should be 5.5-7.0. Why does a farmer mix lime in the soil? Explain. ,

Find the value of 7^0 + 5^0 is

Find the value of ( 7^0 + 5^0 )/ 2^0

Find the value of | [5,3],[-7, 0] |

(a). What does the pH of a solutio signify? Three solutions A, B and C have pH values of 6,4 and 10 respectively. Which of te solutions is highly acidic? (b). A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH.

(a) Describe the importance of pH in everyday life. Illustrate your answer with examples. (b) A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical meterials which he can mix with the soil to adjust its pH. Give reason for your choice. (c) Why are detergents also called 'soap-less soaps' ? Give the various advantages of detergents over soaps. (d) A person put some universal indicator paper on to wet soap. The pH is found to be 8. What does this tell you about soap ?

Why does rain water have normally pH of about 5.6?

Why does rain water have a pH of about 5-6 ?

The value of (2^0 + 5^0)/7^0 is

Solve the following crossword puzzle with the clues given: Across 2. Plantation prevents it. 5. Use should be banned to avoid soil pollution. 6. Type of soil used for making pottery. 7. Living organism in the soil. Down 1. In desert soil erosion occurs through. 3. Clay and loam are suitable for cereals like. 4. This type of soil can hold very little water. 5. Collective name for layers of soil.