21. Which ionic solid has the smallest lattice energy? A. NaCl B. CaBr2 C. BaS D

Question

21. Which ionic solid has the smallest lattice energy? A. NaCl B. CaBr2 C. BaS D. MgO E. Na2O 22. Based on our lecture discussion on the common ion effect, for the following reaction at equilibrium KCI (s) K+ (aq) + Cl-(aq), which of the following statement(s) is(are) true? I. KCl is more soluble in water than in 0.01 M KOH II. If a 5 M solution of HCl is added to the system, equilibrium will shift left (towards reactant) III If NaCl (aq) is added to the system, more KCl (s) will dissolve A. I only B. I IC. I only D. II, IIIE. All statements are true

Explanation / Answer

21) Lattice energy is defined as the energy required to separate a mole of an ionic solid into gaseous ions.

    as the charge of the ions increases, the lattice energy increases

    as the size of the ions increases, the lattice energy decreases

answer: A

22)

according to lechatliers principle,when a system at equilibrium,undergoes stress,the equilibrium shift in such a way that, in order to undo the stress.

answer: B

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