10. (A) Choose the more electronegative element from the pair: Si or 0. (3 pts)

Question

10. (A) Choose the more electronegative element from the pair: Si or 0. (3 pts) (B) Choose the element with higher 1st ionization energy from the pair: Fe (or) Co (C) Choose the metal with stronger metallic character from the pair: K (or) Rb 11. Give the expected maximum oxidation state for the following elements. (2 pts) Cr Os Write the equation for the H2 gas production process in small scale and industrial scale. (2 points) 12. 13. Predict the product of the following reactions. (3 points) A)Ca+H2 B)3H2 + N2 c) co + 2H2 Bonus Questions (3 points) Choose the relatively strong acid from the following pair. 1. SiCl4 or SIF 2. H2S0s or H2S0 3. H2S or H2S

Explanation / Answer

10) a)

the more electronegative atom is O (in second period and Si in third peiod)

b) Ionisation energy of Fe is slighlty more than Co. { it is due to the fact that the atomic radius varies gradually in the d-block elements and is the lowest at VIII gruop elements)

c) As we move down the group, the metallic nature increases , thus Rb is more metallic than K.

11)

c)The maximum oxidation states of Chromium is +6 (its group number in roman VI lette)

Osmium is +8 (group number VIII)

12) In the lab , H2 is prepared by action of dil. HCl on Zn metal

Zn + 2HCl -----------> ZnCl2 + H2

Industrially prepared by steam reformingof methane

Ch4 + H2O ------------> CO +3H2

13) Ca + H2 ----------> CaH2

3H2 + N2 -----------> 2NH3

CO + H2 -----------> No reaction

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