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CHEMISTRY 4. Which of the following diagrams best represents the arrangement of electron pairs around the central iodine atom in the I 3 – ion? A B C D 5. When a voltage is applied to an n-type semiconductor, which of the following migrate through the lattice? A Electrons B Negative ions C Positive holes D Both electrons and positive holes 6. Which of the following compounds would produce fumes of hydrogen chloride when added to water? A LiCl B MgCl 2 C PCl 3 D CCl 4 Page three [X012/701] [Turn over 1. The diagram shows one of the series of lines in the hydrogen emission spectrum. Each line A represents an energy level within a hydrogen atom B results from an electron moving to a higher energy level C lies within the visible part of the electromagnetic spectrum D results from an excited electron dropping to a lower energy level. 2. Which of the following compounds shows most covalent character? ACH 4 B NaH CNH 3 DPH 3 3. In which of the following species is a dative covalent bond present? AH 3 O + BH 2 O COH – DO 2 121 . 6 102 . 697 . 391 . 2 wavelength (nm) 11. Which of the following graphs shows the temperature change as 2 mol l “1 sodium hydroxide is added to 25 cm 3 of 2 mol l “1 hydrochloric acid? A B C D 7. Zinc oxide reacts as shown. ZnO(s) + 2HCl(aq) ? ZnCl 2 (aq) + H 2 O( A ) ZnO(s) + 2NaOH(aq) + H 2 O( A ) ? Na 2 Zn(OH) 4 (aq) This shows that zinc oxide is A basic B acidic C neutral D amphoteric. 8. The correct formula for the tetraamminedichlorocopper(II) complex is A [Cu(NH 3 ) 4 Cl 2 ] 2 – B [Cu(NH 3 ) 4 Cl 2 ] C [Cu(NH 3 ) 4 Cl 2 ] 2 + D [Cu(NH 3 ) 4 Cl 2 ] 4 + . 9. Which of the following aqueous solutions contains the greatest number of negatively charged ions? A 500 cm 3 0 . 10 mol l “1 Na 2 SO 4 (aq) B 250 cm 3 0 . 12 mol l “1 BaCl 2 (aq) C 300 cm 3 0 . 15 mol l “1 KI(aq) D 400 cm 3 0 . 10 mol l “1 Zn(NO 3 ) 2 (aq) 10. When one mole of phosphorus pentachloride was heated to 523 K in a closed vessel, 50% dissociated as shown. How many moles of gas were present in the equilibrium mixture? A0 . 5 B1 . 0 C1 . 5 D2 . 0 Page four [X012/701] U 532 PCl (g) PCl (g) + Cl (g) 02550 Volume of NaOH/cm 3 Temperature/ºC 02550 Volume of NaOH/cm 3 Temperature/ºC 02550 Volume of NaOH/cm 3 Temperature/ºC 02550 Volume of NaOH/cm 3 Temperature/ºC

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