Puzzel 3

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 puzzle

 try it if you get answers post them in the comments section.

Across

1. oxidising agent
2. Base in Aqueous solution
3. made with Calcium Phosphate
4. CaSO4 2H2O

Down

1. decorating materials & toys
2. Pop Sound
3. Lime water turns into milky white
4. turns in to red in acid
5. pH scale was introduced

for key 

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