Predict the sign of entropy change for each of the following changes of state
a) 'Hg(l) rarr Hg(g)^circ'
b) 'AgNO_3(s) rarr AgNO_3(aq)'
c) 'I_2(g) rarr I_2(s)'
d) 'C' (graphite) 'rarr C' (diamond)

Predict the sign of entropy change in the following reactions. i) O_2(g)+2 SO_2(g) rarr 2 SO_3(g) ii) 2 H_2(g)+O_2(g) rarr 2 H_2 O(g)

Predict in which of the following, entropy increases:(iii) H_2(g)rarr 2H(g) .

Write the half reactions for the following redox reaction. Zn(s) + 2H^+ (aq) rarr Zn^(2+) (aq) + H_2(g)

Write half equations for each of the following redox reactions: i) 'Zn(s)+PbCl_2(aq) rarr Pb(s)+ZnCI_2(aq)' ii) '2 Fe^(3+)(aq)+2 I-(aq) rarr I_2(aq)+2 Fe^(2+)(aq)' iii) '2 Na(s)+Cl_2(g) rarr 2 NaCl(s)'

Write the half reaction for the following redox reaction. 2Fe^(3+)(aq) + 2l (aq) rarr I_2 (s) + 2Fe^(2+) (aq)

Find out the oxidising agent and reducing agent in the following reaction: Cu(s)+2Ag^(+) (aq)rarr Cu^(2+) (aq) + 2Ag(s)

Identify the oxidant and reductant in the following reactions. a) 'Zn(s)+ 1/2 O_2(g) rarr ZnO(s)' b) 'C H_4(g)+4 Cl_2(g) rarr CCl_4(g)+4 HCl(g)' c) 'I_2(a q)+2 S_2 O_3 ^(2-)(a q) rarr 2 I(a q)+S_4 O_6^(2-)(a q)' d) 'Zn(s)+2 H^+(a q) rarr Z n^(2+)(a q)+H_2(g)'

Identify the subtance oxidized, reduced, oxidizing agent and reducing agent ror each of the following reactions. a) '2 AgBr(s)+C_6 H_6 O_2(aq) rarr 2 Ag(s)+2 HBr(aq)+C_6 H_4 O_2(aq)' b) 'HCHO(l)+2[Ag(NH_3)_2]^+(a q)(+3) OH-(aq) rarr 2 Ag(s)+HCOO^-(aq)+ 4 NH_3(aq)+2 H_2 O(l)' c) 'HCHO(l)+2 Cu^(2+)(aq)+5 OH^-(aq) rarr Cu_2 O(s)+HCOO^-(aq)(+3) H_2 O(l)' d) 'N_2 H_4(l)+2 H_2 O_2(l) rarr N_2(g)+4 H_2 O(l)' e) 'Pb(s)+PbO_2(s)+2)H_2 SO_4(aq) rarr 2 PbSO_4(s)+2 H_2 O(I)'

Write the structues of te product of the following reactons. (iii) CH_3-C-=CH overset(Hg^(2+)H_2SO_4)rarr