Question

1. Which chemical can be used in the laboratory to make oxygen A. Hydrochloric acid B. Sodium hydroxide C. Hydrogen peroxide D. All of the above 2. Which catalyst is usually used in the laboratory to speed up the production of oxygen? A. Vanadium (v) oxide B. Iron C. Manganese (iv) oxide D. None of the above 3. What is the element symbol of oxygen? A. Al B. O C. Pb D. Sn 4. Which of the following combinations of gases is used for metal welding? A. Oxygen-ethyne B. Hydrogen-ethyne C. Hydrogen-oxygen D. Ethyne –hydrogen and oxygen 5. Which of the following substances is a peroxide? A. Na2O2 B. CuO C. Pb2O4 D. Fe2O3

Answer 1

Answer:

all the oladove because oxide

Answer 2

Answer:

1.hydrogen peroxide

2.oxide

3.a. aluminium

b. oxygen

C. lead

d. tin