Question

7) The reaction below is exothermic 2502 (8) + 02 (8) 2003 (8) will result in an increase in the number of moles of SO3 (8) in Le Chatelier's Principle predicts that the reaction container. A) increasing the volume of the container B) increasing the pressure C) increasing the temperature D) decreasing the pressure E) removing some oxygen 2B. For this reaction the value of the equilibriur 8) Shown below is a concentration vs. time plot for the reaction A constant is - Concentration (M) 2.00 4.00 3.00 - Time (min) A) Ke<1. B) Ke-0. Ke=1. D) Kc>1. 9) What is the conjugate acid of NH3? A) NH3 B) NH OH NH2 D) NHÀ E) NH3* 10) What is the pH of an aqueous solution at 25.0 °C in which [OH-] is 0.00250 M? A) +2.60 B) -2.60 C) +11.4 D) -11.4 11) What is the pH of a 0.0025 M aqueous solution of HCl at 25.0°C? A) -2.60 B) -3.40 C) 2.25 D) 3.40 E) -2.25 E) 2.60 12) The Ka of hypochlorous acid (HCIO) is 3.00 10-8. What is the pH at 25.0°C of an aqueous solution that is 0.0200 M in HCIO? A) +2.45 B) -2.45 C) -9.22 D) +9.22 E) +4.61 13) The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 75 10-3, K2=6.2 10-8, and Ka3 = 4.2 10-13 at 25.0°C What is the pH of a 25 M aqueous solution of phosphoric acid? A) 0.40 B) 0.13 C) 0.87 D) 1.8 E) 2.5 A-2
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Answer 1

6 Le-chatelier's principle oat chemical equilibrium in a chemical reaction, if there is any change thon now equilibrium will try to re-store the old equilibrium, 2502(g) + O2(9) = 2 503 (9) if pressure is incrossed then reaction will goes in such a way that pressure will decreases, & at product side gaseous molecules are less, so pressure is less hence reaction will shift in forwand direction and moles of soz will increase option (B) is correcto