Part A carefully read each task (A1 — A7), choose the correct answer from the four options provided, and mark it. A1. The

Part A carefully read each task (A1 — A7), choose the correct answer from the four options provided, and mark it. A1. The main oxides include: 1) bromine oxide (VII); 2) aluminum oxide; 3) sulfur oxide (IV); 4) potassium oxide. A2. The sum of the coefficients in the reaction equation between sodium oxide and hydrochloric acid is: 1) 4; 2) 8; 3) 10; 4) 12. A3. Electric current conducts: 1) an aqueous solution of glucose; 2) an aqueous solution of sodium chloride; 3) molten sulfur; 4) molten silicon oxide. A4. The reaction of ion exchange between solutions occurs: 1) sodium chloride and silver nitrate; 2) sulfuric acid and sodium nitrate; 3) potassium sulfate and copper chloride (II); 4) hydrochloric acid and sodium sulfate. A5. Reacts with dilute sulfuric acid: 1) copper; 2) water; 3) carbon dioxide (IV); 4) magnesium oxide. A6. Are the following statements about safe work rules in a chemical laboratory true? A. The test tube being heated should be held away from oneself. B. To accelerate the dissolution of solid substances in a test tube, you need to cover its opening with a finger and shake it. 1) Only A is true; 2) only B is true; 3) both statements are true; 4) both statements are false. A7. The mass fraction of oxygen in sodium carbonate is: 1) 15%; 2) 27%; 3) 48%; 4) 57.8%. Part C C1. Write the reaction equations from which the following transformations can be carried out: ZnCl2 -> X -> ZnO -> ZnSO4