State whether the following statements are true or false. If a statement is false write the correct statement.



1.     Washing soda is an efflorescent substance. True.

2.     Washing soda is a hygroscopic solid.
False. Washing soda is an efflorescent sold substance.

3.     Copper sulphate is used to determine percentage of glucose in the urine of a diabetic patient. True.

4.     Ferrous sulphate is used to prepare ink. True.

5.     Crystalline ferrous sulphate is green in colour, whereas amorphous powder is white in colour. True.

6.     Alum solution is used in the Daniell cell.
False. Copper sulphate is used in Daniell cell.


7.     Burnt alum is used in medicine. True

8.     Bleaching powder is used to disinfect water. True


9.     Plaster of Paris hardens when mixed with proper quantity of water True.

10.  Bleaching powder is used for sealing the gaps in the laboratory apparatus, where airtight arrangement is required.
False. Plaster of Paris is used for sealing the gaps in the laboratory apparatus, where airtight arrangement is required.