1. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?
(A) NH₄ and NH₄Cl
(B) ZnO₂ and ZnCl₂
(C) H₂O and HCl
(D) NO and NO₂
(E) CH₄ and CO₂

1. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? (A)NH₃ and NCl₃ (B)ZnO and ZnCl₂ (C)H₂O and HF (D)NO and NO₂ (E)CH₄ and CO₂

2. How many of the following is/are incorrect?i. The importance of the equation E=mc² is that energy has mass.ii. Electromagnetic radiation can be thought of as a stream of particles called photons.iii. Electromagnetic radiation exhibits wave properties.iv. Energy can only occur in discrete units called quanta.(A) 0(B) 1(C) 2(D) 3(E) 4

3. Which of the following atoms or ions has three unpaired electrons? (A) N (B) O (C) Al (D) S²⁻ (E) Ti²⁺

4. Choose the compound with the most ionic bond. (A) LiCl (B) KF (C) NaCl (D) LiF (E) KCl

5. Which of the following pairs is incorrect? (A) NH₄Br ammonium bromide (B) K₂CO₃, potassium carbonate (C) BaPO₄, barium phosphate (D) CuCl, copper(I) chloride (E) MnO₂, manganese(IV) oxide

6. How many of the following molecules have all of their atoms in the same plane? H₂C=CH₂ OF₂ H₂CO NH₃ CO₂ BeCl₂ (A) 3 (B) 4 (C) 5 (D) 6 (E) 7

7. How many of the following: F₂, B₂, O₂, N₂, are paramagnetic? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

8. A fuel-air mixture is placed in a cylinder fitted with a piston. The original volume is 0.320-L. When the mixture is ignited, gases are produced and 805 J of energy is released. To what volume will the gases expand against a constant pressure of 635 mmHg, if all the energy released is converted to work to push the piston? (A) 9.19 L (B) 6.96 L (C) 9.83 L (D) 9.51 L (E) 1.59 L

9. Consider the following processes:2A → (1/2)B + C                      ΔH₁ = 5 kJ/mol(3/2)B + 4C → 2A + C + 3D    ΔH₂ = -15 kJ/molE + 4A → C                              ΔH₃ = 10 kJ/molCalculate ΔH for: C → E + 3D(A) 0 kJ/mol(B) 10 kJ/mol(C) -10 kJ/mol(D) -20 kJ/mol(E) 20 kJ/mol

10. Given a cylinder of fixed volume filled with 1 mol of argon gas, which of the following is correct? (Assume all gases obey the ideal gas law.) (A) If the temperature of the cylinder is changed from 25°C to 50°C, the pressure inside the cylinder will double. (B) If a second mole of argon is added to the cylinder, the ratio T/P would remain constant. (C) A cylinder of identical volume filled with the same pressure of helium must contain more atoms of gas because He has a smaller atomic radius than argon. (D) Two of the above. (E) None of the above.

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