Which one of the following has `Delta S^(@)` greater than zero?
`CaO(s)+CO_(2)(g)rarrCaCO_(3)(s)`
`NaCl(aq)rarrNaCl(s)`
`NaNO_(3)(s)rarrNa^(+)(aq)+NO_(3)^(-)(aq)`
`N_(2)(g)+3H_(2)(g)rarr2NH_(3)(g)`

Which of the following is correct for the reaction? N_(2)(g) + 3H_(2)(g) rarr 2NH_(3)(g)

Write balanced ionoic half equation (oxidation and reduction) for each of the following reactions: (a) Mn^(3+)(aq)rarrMnO_(2)(s)+Mn^(2+)(aq) (b) Mn(s)+NO_(3)^(Ө)(aq) rarr Mn^(2+)(aq)+NO_(2)(g) (c ) H_(2)O_(2)(aq) + Fe^(2+) (aq)rarrFe^(3+)(aq)+H_(2)O(l) (d) Te(s)+NO_(3)^(Ө)(aq)rarr TeO_(2)(s)+NO(g)

Predict which of the following reaction (s) has a positive entropy change? I . Ag^(+)(aq)+Cl^(-)(aq)rarrAgCl(s) II . NH_(4)Cl(s)rarrNH_(3)(g)+HCl(g) III . 2NH_(3)(g)rarrN_(2)+3H_(2)(g)

Predict which of the following reactions have positive entropy changes. (a) NH_(3(g))+HCl_((g))rarrNH_(4)Cl_((s)) (b) Cu_((aq))^(+2)+S_((aq))^(-2)rarrCuS_((s)) (c ) NH_(2)COONH_(4(s))rarr2NH_(3(g))+CO_(2(g)) (d) Condensation of water

Write balanced net ionic equations for the following reactions in basic solution: (a) H_(2)O_(2)(aq)+ClO_(4)^(Ө)(aq) rarr ClO_(2)^(Ө)(aq)+O_(2)(g) (b) ( c) Cu(OH)_(2)(s) + N_(2)H_(4)(aq) rarr Cu(s)+N_(2)(g) (d) MnO_(4)^(Ө) + IO_(3)^(Ө)(aq)rarr MnO_(2)(s) + IO_(4)^(Ө)(aq)

Which of the following halides react(s) with AgNO_(3)(aq) to give a precipitate that dissolves in Na_(2)S_(2)O_(3)(aq)

Justify that the following reaction are redox reactions: a. CuO(s)+H_(2)(g)rarr Cu(s)+H_(2)O(g) b. Fe_(2)O_(3)(s)+3CO(g)rarr 2Fe(s)+3CO_(2)(g) c. 4BCl_(3)(g)+3LiAlH_(4)(s) rarr 2B_(2)H_(6)(g)+3LiCl(s)+3AlCl_(3)(s) d. 2K(s)+F_(2)(g)rarr 2K^(o+)F^(Θ)(s) e. 4NH_(3)(g)+5O_(2)(g)rarr 4NO(g)+6H_(2)O(g)

Predict the sign of DeltaS for each of the following process: a. O_(2)(g) rarr 2O(g) b. N_(2)(g) +3H_(2)(g) rarr 2NH_(3)(g) c. C(s) +H_(2)O(l) rarr CO(g) +H_(2)(g) d. Br_(2)(l) rarr Br_(2)(g) e. N_(2)(g, 10 atm) rarr N_(2)(g,1atm) f. Desalination of water. g. Devitrification of glass h. Hard boiling of an egg i. C(s, "graphite") rarr C(s, "diamond")

Classify the following redox reactions: a. N_(2)(g)+O_(2)(g)rarr 2NO(g) b. 2Pb(NO)_(3)(s)rarr2PbO(s)+2NO_(2)(g)+(1)/(2)O_(2)(g) c. NaH(s)H_(2)O(l)rarr NaOH(aq)+H_(2)(g) d. 2NO_(2)(g)+2overset(ө)OH(aq)rarrNO_(2)^(ө)(aq)+NO_(3)^(ө)(aq)+H_(2)O(l)

Write an expression for K_(p) and K_(c) for the following heterogeneous and homogenous equilibrium. (i) CaCO_(3)(s) hArr CaO(s) +CO(g) (ii) H_(2)O(l)+CO_(2)(g) hArr H_(2)CO_(3)(aq) (iii) 2NH_(3)(g) hArr N_(2)(g) +3H_(2)(g) (iv) 2HgO(s) hArr 2Hg (l) +O_(2)(g)