Question

B. Choose the correct option. 1. Which out of the following cannot be broken down into simpler substances by chemical means? a. Element b. Compound C. Mixture d. Molecule 2. What is the chemical symbol of iron? b. 1 d. F 3. Which of the following represents the chemical formula of a compound? a. C b. Ca d. CO2 4. What are the new substances (elements/compounds) formed in a chemical reaction called? a. Rust b. Products C. Mixtures d. Reactants 5. What is the substance responsible for the browning of cut surfaces of vegetables and fruits called? a. Zinc b. Melanin C. Rust d. Copper 6. Which of the following elements exist as tetratomic molecules? a. Hydrogen b. Nitrogen C. Potassium d. Phosphorous 7. What is the chemical formula for sodium oxide? a. Nao b. Na, C. NaO, d. Na, O2 8. Which gas is released in reaction of vinegar with baking soda? a. Oxygen b. Nitrogen C. Carbon dioxide d. Carbon monoxide 9. Which of the following elements exhibits valency 2? a. Oxygen b. Sodium C. Aluminium d. Nitrogen 10. Which of the following represents an element? d. KCI vent rious ew zation b. C12 C. HCI a. NaCl​

Answer 1

Answer:

1.) A.) Elements

2.) C.) Fe=Iron

3.) D.) Co2

4.) B.) Products

5.) D.) Copper

6.) D.) Phosphorous

7.) B.) Na₂O

8.) C.) CO2 or Carbon Dioxide

9.) A.) Oxygen

10.) B.) Chlorine Gas or Cl2

Answer 2

Explanation:

1 element

2 Fe

3 co²

4 products

5 copper

6 phosphorous

7 Na²O

8 carbon dioxide

9 oxygen

10 CI²