What is the overall reaction order of the following elementary reaction? 2 Cl (g

Question

What is the overall reaction order of the following elementary reaction? 2 Cl (g) + Ar(g) rightarrow Cl_2 (g) + Ar(g) (a) unimolecular (b) bimolecular (c) termolecular (d) You cannot determine the order from the reaction equation. (e) Zero order reaction since Ar appears both as a reagent and as a product The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and Delta H degree = + 55 kJ/mol. What is the activation energy for the reverse reaction? (a) 27 kJ mol (b) 47 kJ mol (c) 55 kJ/mol (d) 102 kJ/mol (e) 157 kJ/mol Which of the following species have a dipole moment equal to zero? Mark all correct choices. (a) CIF_5 (b) PH_3 (c) SO_2 (d) CS_2 (e) BH_4^- How many atoms are in one molecule of cadmium perchlorate? (a) 11 (b) 10 (c) 7 (d) 6 (e) 5 Which of the following ionic compounds has the highest lattice energy? (a) Beryllium fluoride (b) Beryllium iodide (c) Beryllium chloride (d) Beryllium bromide (e) Calcium iodi

Explanation / Answer

22) The order of an elementary reaction is equal to the molecularity of the reaction. By molecularity of a reaction, we mean the number of molecules taking part in the elementary reaction. Since there are three molecules taking part in the reaction (2 molecules of NO collide with one molecule of Ar), the molecularity and hence order of the reaction is termolecular.

Ans: (c) termolecular

23) The activation energy for a particular reaction is a fixed parameter. Since the forward reaction and the backward reaction will proceed through the same intermediate transition step, hence the activation energy for the formation of the intermediate from both the directions must be the same. Hence, the activation energy for the reverse reaction is 102 kJ/mol.

Ans: (d) 102 kJ/mol.

24) SO2 and CS2 are linear molecules. The individual bond moments cancel each other and hence both these molecules have zero dipole moment.

Additionally, BH4- is tetrahedral. All the four B-H bonds are polar (since B is more electronegative than H and hence each B-H bond has a bond moment). However, the resultant of all the bond moments in the molecule is zero. Therefore, BH4- has zero dipole moment.

Ans: (c) SO2, (d) CS2 , (E) BH4-

25) Cadmium perchlorate has the molecular formula Cd(ClO4)2; hence there are 1 atom of Cd, 2 atoms of Cl and 8 atoms of O. The total number of atoms in one molecule of cadmium perchlorate is thus 11.

Ans: (a) 11

26) The ionic compound having the most compact structure will have the highest lattice energy. The compactness of the structure is determined by the size of the cation(s) and anion(s) forming the lattice. Both Be and F are elements of the second period and hence small in size. Infact, fluorine has the smalles atomic radius. Therefore, Be and F can bind most strongly due to their comparable sizes. All the other halogen atoms are much larger in size and hence close packing of ions is a problem. Therefore, beryllium fluoride will have the highest lattice energy.

Ans: (a) Beryllium fluoride

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