Q1 of 58 Page 34

Write true or false for the following statements:

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

False

When green crystals of ferrous sulphate (FeSO4) are heated, the crystals lose water and the colour of the crystals changes to brown. This is decomposition reaction.


Hence, the give statement is false.


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19

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

 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

 2

Write true or false for the following statements:

Calcium oxide is also called lime quicklime.

 3

Write true or false for the following statements:

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