Under what soil condition do you think farmer would treat the soil of his fields with quick lime (calcium oxide ) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

How calcium hydroxide is prepared ? OR How slaked lime is prepared ?

Solid calcium oxide reacts vigourously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is true about slaking of lime and the solution formed? (i) It is an endothermic reaction (ii) It is an exothermic rection (iii)The pH of the resulting solution will be more than seven (iv)The pH of the resulting solution will be less than seven

What happens when (i) magnesium is burnt in air, (ii) quick lime is heated with silica, (iii) chlorine reacts with slaked lime, (iv) calcium nitrate is heated.

Which gas is being produced in the test tube when hydrochloric Acid is added to sodium carbonate ? How does gas react with calcium hydroxide/lime water?

• Take a small amount of calcium oxide or quick lime in beaker. • Slowly add water to this. • Touch the beaker as shown in Fig. Do you feel any change in temperature?