以下题目的难度是根据AST OG设置的，1-10题每题10分，共100分。

1. NA represents the Avogadro number. Which of the following statement is correct?

60g of propanol contains 10NA covalent bonds.

The sum of HCO3- and CO32- in 1L 0.1mol L-1 NaHCO3 solution is 0.1NA

NA electrons transfer in completely combustion of 23g sodium

The net production of neutrons is 10NA in the nuclear fission of 235g 235U
235U + 1n ------ 90Sr + 136Xe + 101n

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?

55kJ

220 kJ

550 kJ

1108 kJ

3. Which of the following statement about platinum is correct?

202Pt and 198Pt have the same number of protons and are isotopes

202Pt and 198Pt have the same number of neutrons and are isotopes

202Pt and 198Pt have the same number of electrons and are same atoms

202Pt and 198Pt have the different mass number and are NOT isotopes

4. Which of the following statements about CO2 and CH4 is correct?

CO2 is a molecular compound.

CO2 contains non-polar bonds and is a non-polar molecule.

CH4 contains polar bonds and is a polar molecule.

CH4 has a lower melting point than CO2 because C-H has lower bond energy than C=O.

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?

12.5g

13.2g

19.7g

24.4g

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?

1.7

2.0

12.0

12.4

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?

NO2

SO2

SO3

CO2

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?

A. 12.6

B. 16.8

C. 18.9g

D. 25.2g

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?

A. 0.80

B. 0.85

C. 0.90

D. 0.93

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?

A. Phenolphthalein

B. Barium chloride

C. Sodium hydroxide

D. Silver nitrate

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