Question

1. Write the reaction of Na, K, Ca, Li, Be, Mg, Mn, Al, Zn with oxygen and write the name of the compound

2. Using the same element given in question 1 write the reaction with hydrogen and write the name of the compound

3. List out the traids given by Dobereiner

4. What are the demerits of Dobereiner traid

5. Write the names and symbol of elements from 30 to 40​

Answer 1

Answer:

1. reaction of sodium (Na) with oxygen:

2Na+O2 ----→ 2Na2O.(sodium oxide)

reaction of potassium (K) with oxygen:-

4K +O2-----→ 2K2O(potassium oxide)

reaction of calcium (Ca) with oxygen :-

Ca+O2 -----→ CaO2(calcium oxide)

reaction of lithium (Li) with oxygen :-

4Li +O2----→ 2Li2O(lithium oxide)

reaction of magnesium (Mg) with oxygen:-

2Mg+O2-----→ 2MgO (magnesium oxide)

reaction of beryllium (Be) with oxygen:-

2Be+O2-----→ 2BeO (beryllium oxide)

reaction of aluminium (Al) with oxygen:-

4Al + 3O2----→ 2Al2O3 (Aluminium oxide)

reaction of mangenese (Mn) with oxygen:-

4Mn+3O2----→ 2Mn203 (manganese oxide)

reaction of zinc (Zn) with oxygen:-

2Zn+O2----→ 2ZnO (zinc oxide)

these reactions are balanced.

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