ANSWER Q17. Option (a) is the correct answer. While titrating NH3 with HCl some

Question

ANSWER

Q17.

Option (a) is the correct answer. While titrating NH3 with HCl some of the NH3 will evaporate as a result less amount of NH3 will be indicated in the result.

Q18

Option (b) is the correct answer. A sulphde (CdS) will be formed.

Q19.

Normalty of an acid = bascicity of the acid X Molarity

Bascicity = No. of ionisable protons

For H2SO4 bascicity = 2.

Hence Normalty of H2SO4 = 2 X Molarity

So option (c) is the correct answer.

Q20. Option (b) is the corect answer. Removing a reactant from reaction mixture will shift the equilibrium to left to form more reactant as per Le Chatliers Law.

Explanation / Answer

17. A student synthesized the coordination compound, Ni(NHC2 To determine the amount of NH in the compound, the student dissolved the compound and then directly titrated the solution with HCl instead of adding excess HCl and back-titrating with NaOH as instructed in the procedure. How would this calculated percent of NH differ from the actual percent? a Percent would be lower due to evaporation and premature reaction b. Percent would be higher due to evaporation and premature reaction e Percent would be lower due to incomplete reaction between NH d. Percent would be higher due to incomplete reaction e Percent would be unaffected in this case. of NH of NH3 and HCI. and HCI. between NH s. When thioacetamide (CH,CSNH2) is added to a solution with Cd at pH-0.5, which of the following is formed? a Chloride b. Sulfide e Sulfate d. None of the above 19. The normality of H2SO, is equal to multiply its molarity a. Half b One e. Two d Three e. Four 20. The thermochemical equation for the formation of ammonia from elemental nitrogen and hydrogen is as follows: N2(g) + 3H2 (g) D 2NH, (g) AH=-92.2 kJ Given the system is initially at equilibrium, which of the following actions would cause the reaction to shift to the left? a removing NH, (g) b. removing H2 (g) e decreasing the temperature d adding a catalyst e adding N2 (g)

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