Chemistry

DIRECTIONS : Chemistry Questions and Answers.
21. _____ is used to prepare the fertilizer ammonium sulphate.
 
Answer
Ans:Ammonia
22. Sulphur is used in the ____ of rubber.
 
Answer
Ans: vulcanization

23. _____ is used in softening of hard water.
 
Answer
Ans: Sodium carbonate
24. Formaldehyde reacts with ____ to form urotropine.
 
Answer
Ans:ammonia
25. Most of the metals have ___ melting points.
 
Answer
Ans: high
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