A) \[NH_{4}^{+}\]
B) \[Cu(N{{H}_{3}})_{4}^{2+}\]
C) \[NiCl_{4}^{2-}\]
D) \[meso-[Co{{(N{{H}_{3}})}_{3}}C{{l}_{3}}]\]
Correct Answer: C
Solution :
An entropy \[C{{H}_{3}}Br,C{{H}_{3}}Cl,C{{H}_{3}}F\] of a reaction is positive if the products are in more random state as compared to reactants (order of randomness is gas > liquid > solid). \[C{{H}_{3}}Br,C{{H}_{3}}F,C{{H}_{3}}Cl\] This process is accompanied by increase in randomness because \[N{{a}_{2}}O\] and \[C-H\] ions are free to move in solution whereas they are not free to move in solid \[N{{H}_{4}}N{{O}_{3}}\]. In product (solid) has lesser entropy as compared to reactants. In \[N{{H}_{4}}N{{O}_{3}}\] (solid) has lesser entropy as compared to \[-7.53\text{ }kJ/mol\](\[-398.1\text{ }kJ/mol\] and \[-16.1\text{ }kJ/mol\]). In both reactants and products are in gaseous state but number of moles of products are decreasing.
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