1. NA represents the Avogadro number. Which of the following statement is correct?
2. The enthalpy of combustion for propane is ΔH= -2215 kJ mol-1. How much heat is released (approximately) from complete combustion of propane if 1.8g of water is produced?
3. Which of the following statement about platinum is correct?
4. Which of the following statements about CO2 and CH4 is correct?
5. Products of methane combustion containing carbon monoxide, carbon dioxide, and water vapor weight 49.6g. The mixture passes anhydrous CaCl2 and the mass of the desiccant increases by 25.2g. What is the mass of carbon dioxide?
6. What is the pH of a mixture of equal volume of 0.1mol L-1 hydrochloric acid and 0.06 mol L-1 barium hydroxide?
7. Given 0.1mol of the following gases, after mixing with 1L 0.1mol L-1 sodium hydroxide solution, which one will have the lowest pH?
8. n grams of dilute HNO3 solution completely reacts 5.6g iron. If n/4 grams of HNO3 being reduced to NO (with no other products of reduction), which of the following values of n must be incorrect?
9. 1.52 gram of FexO reacts with sufficient hydrochloric acid. The produced mixture reacts with 112 ml of Cl2 to perfectly oxidize the Fe2+. What is the value of x?
10. Chlorine gas is used as a disinfectant in tab water. Which of the following reagents can be used to test if tab water is bottled for sale?