Q2. Fill in the blanks
1. There are 7 __________ and 18 __________ in the modern period table.
2. During oxidation of ammonia _________ acts as the catalyst.
3. Electrolytic ___________ of water to hydrogen and oxygen is called ___________.
4. __________ is the hardest naturally occurring substances.
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Answer:
1. 7rows and 18 columns
2.molybdenum
3. called electrolytic decomposition reaction
4.diamonds