Question

2.
The formula for sodium carbonate is:
(a) Na Coz (b) Na(CO2), (c) NaCO3
(d) Na (CO2)2
3. Which of the following is a balanced equation?
(a) H, + Cl, → HCI
(b) Na + H,SO, → Na SO, +H,
(c) Zn + CuSO4 → ZnSO4 + Cu
(d) H, + O2 → 2H 0
4. Which information don't we get from the following equation?
Phosphoric acid
2H,02
→ 2H2O + O2
(a) Masses of hydrogen peroxide and products
(b) Presence of catalyst
(c) Other products
(d) Physical state of reactants and products
5. In the equation given below, the ratio by mass of magnesium to oxygen is:
2Mg + O2 + 2Mgo
(a) 3:2
(b) 2:3
(c) 3:4
(d) 4:3​

Answer 1

Answer:

2) Na₂CO₃

Explanation:

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