Question

1.Mg + O -------- > X

X +OH -------- > Y

A. X is MgO and Y is MgOH
B. X is MgO and Y is MgH
C. X is MgOH and Y is MgO
D. X is MgO and Y is OHMg

2. Identify the pathway of carbon dioxide after the exchange of gases in the lungs?
A. Alveolus → bronchiole → bronchus→ trachea → nose
B. Alveolus → traches → bronchiole→ bronchi → nose
C. Nose→ bronchus→ trachea→ bronchiole → alveolus → nose
D. Trachea → bronchus → bronchiole→ alveolus→ nose

3. Choose the correct reaction.
A. CuSO₄ + FeSO₄ ------ > Cu+Fe
B. Cu + FeSO₄ ----------- > CuSO₄ +Fe
C. CuSO₄ + Fe -------- > FeSO₄ +Cu
D. FeSO₄ + Fe --------- > FeSO₄ + F

4. Which of the following is a neutralization reaction?
A. Sodium chloride + Water→ Sodium hydroxide + Hydrochloric acid
B. Calcium carbonate + Water→ Calcium hydroxide + Carbon dioxide
C. Sodium hydroxide + Hydrochloric add →Sodium chloride + Water
D. Copper sulphate + Zinc→ Zinc sulphate + Copper

unnecessary replies will be reported

Answer 1

1. A : forming oxide and react with alkali
3. C : replacement reaction
4. C : in neutralisation the product is always water and a salt