Q2 of 58 Page 34

Write true or false for the following statements:

Calcium oxide is also called lime quicklime.

True

Calcium oxide (CaO) is also called quicklime. Quick lime is formed when calcium carbonate (limestone) is heated. This is also an example of decomposition reaction.


Hence, the give statement is true.


More from this chapter

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20

Which of the following are combination reactions?

(i) 2KClO3 2KCl + 3O2


(ii) MgO + H2O → Mg(OH)2


(iii) 4Al + 3O2→ 2Al2O3


(iv) Zn + FeSO4→ ZnSO4 + Fe

 1

Write true or false for the following statements:

On heating the crystals of ferrous sulphate, the colour changes from green to grey.

 3

Write true or false for the following statements:

On heating the crystals of lead nitrate crystals, the emission of brown fumes occurs.

 4

Write true or false for the following statements:

The thermal decomposition reaction of calcium sulphate (gypsum) is used in black and white photography.