33. (b) False . The large jump in ionisation energy is observed between 2 and 3r

Question

33. (b) False . The large jump in ionisation energy is observed between 2 and 3rd ionisation energies.

Because after losing two electrons it gets noble gas electronic configuration, after which it needs high energy to remove third electron.

34.

deltaHorxn = 2 * deltaH0f(CO2) + 2 * deltaH0f(H2O) - deltaH0f(C2H4) - 3 * deltaH0f(O2)

= 2 ( - 393.5 ) + 2 ( - 242 ) - 3 ( - 84.7 ) - 3 ( 0 )

= - 1186 kJ

So, (c)

35.

(a) Among the isoelectronic species, the ion with higher negative sign is in larger size.

So , O2- .

Explanation / Answer

33. For Calcium (Ca) a very large jump in the magnitude of ionization energy will occur between the third and fourth ionization. a. true b. false 34. Using the Standard heats of formation table calculate the enthalpy change for the reaction Note: The AH for C2H4g is-84.7 kJ/mol c:H4(g) 302(g) 2CO2(g) + 2H2Ow + a. 325 kJ b.-325 kJ C. -1186 kJ d. 167 kJ 35. Which of the following ions is largest? d. Mg +2 +3 7

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