B) The phenomenon of acid rain refers to more acidic precipitation \"natural\" r

Question

B) The phenomenon of acid rain refers to more acidic precipitation "natural" rain. This acidity is due to the presence of weak acid H2CO3 (Ka1 = 4,3x10-7 and Ka2 5,6x10-11). Some scientists acid rain measured a sample obtained pH = 4.8 and the total concentration of carbonates was dissolved in water 4,50x10-3 molL-1 From these experimental data the concentrations of the ionic species involved in equilibrium are: [H2CO3 ] = 9,73x10-1, [HCO3-] = 2.64 x10-2 and [CO3]2 - = 9.33 x10-8

C) If the concentration of H2 is doubled, the balance will be shifted to the left. The mesmoacontece increase the system pressure.

D) If emf of a cell is -0.89 V, the redox reaction is spontaneous.

E) The mechanisms of formation and natural ozone destruction is known as Chapman cycle. But this balance is disturbed when some substances lançandas in the atmosphere act as catalysts of ozone destruction reactions causing an imbalance in the Chapman cycle. A common reaction to destroy the ozone layer is NO 2 (g) + O 3 (g) ? NO3 (g) + O2 (g) from the experimental data contained in the table below the global order of the reaction is 2nd order.

Let from the explanations see what is the right question?

Explanation / Answer

The correct statement identification,

Of the given statements, A) is incorrect as we would require higher concentration of H2 as opposed to N2 for the formation of NH3 by the given reaction. C) is incorrect as -ve emf depicts the reaction in non-spontaneous. D) is incorrect as any change in concentration of [NO2] does not affect the rate of reaction, whereas doubling the concentration of [O3] doubled the rate of reaction. That means the reaction is first order with respect to [O3]. Overall reaction order being first order. So all this leaves that B) is the correct option or alternative from the given ones above.

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