21. Which of the following species can be described by the electron configuration [Ar]4r³3d4p (1) Br (ii) Se (iii) As A)

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21 Which Of The Following Species Can Be Described By The Electron Configuration Ar 4r 3d4p 1 Br Ii Se Iii As A 1 (52.82 KiB) Viewed 12 times

21. Which of the following species can be described by the electron configuration [Ar]4r³3d4p (1) Br (ii) Se (iii) As A) (i) only B) (ii) only C) (iii) only D) (i) and (ii) E) (ii) and (iii) 22. Identify which one of the following statements about the current atomic theory of matter is false. A) Atoms are neither created nor destroyed in chemical reactions. B) For all atoms, the number of the protons is equal to the number of the neutrons in that atom. C) All atoms of a given element are chemically similar, and the atoms of other elements are different and have different properties. D) Compounds are formed when atoms of more than one element combine. E) All statements are true. 23. Which of the following is the correct electron configuration for an oxide lon? A) 18²2s²2p B) 18²2s²2p C) 18²2s²2p² D) 1s 2s 2p 3s 3p 24. The main reaction of a charcoal grill is C(s) + O(g)-CO₂ (g) Which of the following statements below is incorrect? A) I atom of carbon reacts with 1 molecule of oxygen to produce I molecule of carbon dioxide. B) I gram of carbon reacts with 1 gram of oxygen gas to produce 2 grams of carbon dioxide. C) I mole of carbon reacts with 1 mole of oxygen gas to produce 1 mole of carbon dioxide. D) 12 grams of carbon react with 32 grams of oxygen gas to produce 44 grams of carbon dioxide. 25. Nitrogen oxide is oxidized in air to give brown nitrogen dioxide. 2 NO(g) + O₂(g) → 2 NO₂ (g) If you have 2.2 moles of NO, which of the following statements is true? A) You need 2.2 moles of O₂ for a complete reaction and produce 2.2 moles of NO₂. B) You need 1.1 moles of O₂ for a complete reaction and produce 2.2 moles of NO₂. C) You need 1.1 moles of O₂ for a complete reaction and produce 4.4 moles of NO₂. D) You need 1.0 moles of O₂ for a complete reaction and produce 2.0 moles of NO₂. 26. What is the mass of 1.0 mole of carbon dioxide? A) 12g B) 32 g C) 44 g D) 6.0 x 1023 g