2018年11月IB化学SL真题下载-Paper1
1. How many moles of FeS2 are required to produce 32 g of SO2? (Ar : S = 32, O = 16)
4FeS2 (s) + 11O2 (g) → 2Fe2O3 (s) + 8SO2 (g)
A. 0.25
B. 0.50
C. 1.0
D. 2.0
2. The volume of a sample of gas measured at 27 °C is 10.0 dm3. What is the temperature when the volume is reduced to 9.0 dm3 at the same pressure?
A. −3.0 °C
B. 24.3 °C
C. 29.7 °C
D. 57.0 °C
3. 16 g of bromine react with 5.2 g of metal, M, to form MBr2. What is the relative atomic mass of the metal M? (Ar : Br = 80)
A. 13
B. 26
C. 52
D. 104
4. An antacid tablet containing 0.50 g of NaHCO3 (Mr = 84) is dissolved in water to give a volume of 250 cm3. What is the concentration, in mol dm−3, of HCO3− in this solution?
A. 0.250×84/0.50
B. 050/84×0.250
C. 250×84/0.50
D. 0.50/84×250
5. Which statements are correct for the emission spectrum of hydrogen?
- I. The lines converge at higher frequencies.
- II. Electron transitions to n = 2 are responsible for lines in the visible region.
- III. Lines are produced when electrons move from lower to higher energy levels.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
6. Which statement about 56Fe3+ and 54Fe2+ is correct?
A. Both have the same numbers of protons and electrons.
B. Both have the same number of protons.
C. Both have the same number of neutrons.
D. Both have the same numbers of protons and neutrons.
7. Which oxides produce an acidic solution when added to water?
I. Al2O3 and SiO2
II. P4O6 and P4O10
III. NO2 and SO2
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
8. Which species will require the least energy for the removal of one electron?
A. Na+
B. Mg+
C. Al2+
D. C3+
9. Which species has the same molecular geometry as SO32−?
A. BF3
B. SO3
C. PF3
D. CO32−
10. How many lone pairs and bonding pairs of electrons surround the central chlorine atom in ClF2+?
2018年11月IB化学SL真题余下省略！
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