1. which group of elements are found as diatomic molecules (a) alkali metals (b)

Question

1. which group of elements are found as diatomic molecules (a) alkali metals (b) alkaline earth metal (c) halogens (d) noble gas 2. Predict the product when the elements Be(s)+ Br2(l) are mixed (a) BeBr(s) (b) BeBr2(s) (c) Be2Br(s) (d) BeBr3(s) 3. Group 2A metal tend to be somewhat less reactive than alkali metals and the order of their reactivity is (a) BA>Sr>Ca>Mg>Be (b) Be>Mg>Ca>Sr>Ba (c) Ca>Mg>Be>Ba>Sr (c)Sr>Ca>Mg>Be>Ba 4. Which of the following ionic compound would be expected to have the highest lattice energy (a) LiCl (b) NaCL (c) KCL (d) RbCL 5. Which chemical process is associated with the lattice energy of sodium chloride (a) NaCL(c)--Na+(g) +CL-(g) (b) NaCL(g) --Na+(g) Cl-(g) (c) Na(s) +1/2 CL2(g) -NaCL(s) (d) NaCL(s) +H2O(l)--Na+(aq) +Cl-)aq)

Explanation / Answer

1 (C) halogens 2 (B) BeBr2 3 (b) Be>Mg>Ca>Sr>Ba 4 (a) LiCl 5 (a) NaCL(s)--Na+(g) +CL-(g)

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