The following reaction, KNO_3(s) rightarrow K^+(aq) + NO_3^+(aq), has a reaction

Question

The following reaction, KNO_3(s) rightarrow K^+(aq) + NO_3^+(aq), has a reaction enthalpy of -15 kJ/mol. Based on this information, which of the following statements is true regarding the process of dissolving KNO_3 in aqueous solution? a. KNO_3 absorbs heat from the surrounding aqueous solution as it dissolves. b. The process of KNO_3 dissolving is exothermic. c. The temperature of the solution will decrease as KNO_3 dissolves. d. All of above. Which of the following statements is true? a. An atomic orbital with l = 2 is known as a "d orbital". b. Spherically shaped atomic orbitals have l = 0. c The directional orientation (e.g., horizontal, vertical, etc.) of a p orbital is determined by its m/value. d. all of the above Which of the following Is the photon energy of electromagnetic radiation with a wavelength of 421 nm? a. 4.72 times 10^-37 J b. 7.12 times 10^5 J c. 4.72 times 10^-19 J d. 0.000712 J

Explanation / Answer

Answer :

13. Since the enthalpy of reaction is negative .i.e. -15kJ/mol., the reaction is exothermic.

Option 'B' is the correct answer.

The process of KNO3 dissolving is exothermic reaction.

14. Option 'd' is the correct option.

Because, the given statements of 1. An atomic orbital of l=2 is known as 'd' orbital. 2. Spherically shaped atomic orbitals have l = 0 and 3. The directional orientation of p-orbital is determined by its ml value are true statements.

15. Option 'b' is the correct option.

According to the formula, v =c/ wavelength

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