In the following process/es `Delta H lt Delta U`
(A) `C(s) + O_(2)(g) rarr CO_(2)(g)`
(B) `CO(g)+(1)/(2)O_(2)(g) rarr CO_(2)(g)`
(C) `N_(2)(g)+3H_(2)(g) rarr 2NH_(3)(g)`
(D) `CaCO_(3)(s) rarr CaO(s) + CO_(2)(g)`

Predict DeltaH gt DeltaU or DeltaH lt DeltaU . a. C("graphite") +O_(2)(g) rarr CO_(2)(g) b. PCI_(5)(g) rarr PCI_(3)(g) +CI_(2)(g)

For which one of the following reaction,the graph of Delta G against T is almost horizontal to temperature axis (А) C_((s)) + O_(2(g)) rarr CO_(2(g)) (В) 2C_((s)) + O_(2(g)) rarr 2CO_((g)) (с) 2CO_((s)) + O_(2(g)) rarr 2 CO_(2(g)) (D) 2Mg_((s)) + O_(2(g)) rarr 2 MgO_((s))

Consider the following reactions: I. C(s) + 1/2 O_(2)(g) rarr CO(g)," "Delta H_(1) = x_(1) II. CO(g) + 1/2 O_(2)(g) rarr CO_(2)(g), " "Delta H_(2) = x_(2) III. C(s) + CO_(2)(g) rarr 2CO(g)," "Delta H_(3) = x_(3) Select the correct statements:

Calculate in kJ for the following reaction : C(g) + O_(2)(g) rarr CO_(2)(g) Given that, H_(2)O(g) + C(g) + H_(2)(g) , Delta H = +131 kJ CO(g) + 1/2 O_(2)(g) rarr CO_(2)(g), " " Delta H = -242 kJ H_(2)(g) + 1/2 O_(2)(g) rarr H_(2)O(g), " "DeltaH = -242 kJ

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 og an egg i. C(s, "graphite") rarr C(s, "diamond")

For each reaction, wheter the sign of Delta S (entropy) is positive or negative ? (a) Ni(s)+4CO(g)rarr Ni(CO)_(4)(g) (b) 4Fe(s)+3O_(2)(g)rarr 2Fe_(2)O(s) (c ) H_(2)(g)+S(s)rarr H_(2)S(g) (d) 2NO(g)+O_(2)(g)rarr 2NO_(2)(g)

Assign the sign of work done (based on SI convention) in the following chemical change taking place against external atmospheric pressure. (i) N_(2)O_(3)(g)rarr NO(g)+NO_(2)(g) (ii) MgCO_(3)(g)rarr MgO(s)+CO_(2)(g) (iii) C_(6)H_(6)(l)+(15)/(2)O_(2)(g)rarr 6CO_(2)(g)+3H_(2)O(l) (iv) 3H_(2)(g)+N_(2)(g)rarr 2NH_(3)(g) (v) N_(2)O_(4)(g)rarr 2NO_(2)(g) (vi) 2Fe_(2)O_(3)(s)+6CO(g)rarr 4Fe(s)+6CO_(2)(g)

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)

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)