Q4 of 58 Page 34

Write true or false for the following statements:

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

False

The thermal decomposition reaction of calcium sulphate (gypsum) is not used in black and white photography. The


reaction of silver bromide with sunlight to for silver and bromine used in black and white photography.


Hence, the give statement is false.


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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.

 5

Write true or false for the following statements:

The decomposition reaction of silver bromide into silver and bromine by light is used in the manufacturing of cement.

 6

Write true or false for the following statements:

The insoluble substance formed during a chemical reaction is known as a precipitate.