14. Which of the following processes has a AS>0 A CH3OH) CH30H(s) B. N2(g)+3 H2(

Question

14. Which of the following processes has a AS>0 A CH3OH) CH30H(s) B. N2(g)+3 H2(g) 2 NH3(9) ? CH4g)2019)- cog) 3 H2(9) D. Nacoe). 2019)co20) 2 NaHCo30) AS > 0 E. All of the above processes have a 15. What substance(s) is(are) present in the solution at the initial point in the titration of oxalic acid with sodium hydroxide? E. OOCCOOH and ooccoo 16, What substance(s) is(are) present in the solution at the second equivalence point in the titration of oxalic acid with sodium hydroxide? ???????? and ??????? E. OoccOOH and ooccod 17. What substance(s) is(are) present in the solution in the first buffer zone in the titration of oxalic acid with sodium hydroxide? E. OOCCOOH and OoccoO 18. What is the pH at the half-neutralization point in the titration of hydrofluoric acid (Ka 7.2 x 104) wi sodium hydroxide? A. 9.23 C. 1.29 3.14 E. 7.00 B. 14.00 AG 4.2 x 1019 kJ/mol. At equilibrium, this reaction will favor 19. A reaction was found to have a A products B. reactants C. neither reactants nor products 20. The formation reaction for nitrogen dioxide gas is A 2 HNO3(aq)+ NO(g) 3 NO2(9)+ H200) B. N219)+2 02(9)- 2 NO29) C. h N2(g) + 02(9) No2(9) D. 2/3 HNO3(aq)+ 1/3 NO(g)- NO2(g)+ 1/3 H20(0) E. none of these onner isform a cx ion with chloride ions. The formula of the complex ion is

Explanation / Answer

15) At initial point volume of NaOH added equals to zero,so oxalic acid remains as such ie there will be no change in its composition.

So, option B is the correct choice.

16) At second equivalence point, all of the H+ of oxalic acid gets neutalized by NaOH. So, oxalic acid at second equivalence point will be present as - OOCCOO-.

Ie option C is the correct choice.

17) buffer is composition of weakacid/weak base and their salts with strong base/strong acid.

So, here, HOOCCOOH (oxalic acid) and its salt ie

-OOCCOOH are present in solution at first buffer zone.

So, option D is the correct choice.

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