Chapter 10 0-12. ch of the following salts is expected to have the highest melti

Question

Chapter 10 0-12. ch of the following salts is expected to have the highest melting polnt a) NaF (b) NaCl (d) NaBr cNal 10-13. Predict which of each pair should be more soluble in water. i) KCI or KT (ii) MgO or BaO 0-14. Predict which compound in each of the following pairs should have the higher melting iNaCl or RbCI NaCI or Mgcl 10-15. Which of the following is a correct Lewis structure? H-P-IH (d) H-F () H-o-H 10-16. Which of the following is NOT a correct Lewis dot structure? (b) H-CEN: (a) NEN: 10-17. Which of the following is NOT a correct Lewis dot structure? r :o: H-N-Cl: 0-H

Explanation / Answer

10.12, ANS: NaF should have highest melting point amongst all. This is beacuse the radius of F- is smaller than other halides and lattice energy and hence melting point is inversely propertional to ionic radius.

10.14, ANS: (i) NaCl should have higher melting point as the Na+ size is less as comapred to the Rb+. Melting point (Lattice energy) is inversely propertional to the radius of ions.

(ii)MgCl2 should have higher melting point than NaCl. This is becasue the Mg has +2 charge and Na has +1 and lattice energy and melting point is directly propertional to charge.

10.16, ANS: (c) is not a correct lewis structure. This is because the O atom here has three bonds and one lone pair which is incorrect.

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