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An increase in entropy can best be illustrated by
mixing of gases
freezing of water
condensation of vapour
solidifying candle wax
CO(g) + H2O(g) → CO2(g) + H2(g). Calculate the standard heat change if the standard enthalpies of formation of CO2g, H2O(g) and CO(g) in KJ mol-1 are −394, −242 and −110 kJ mol−1 respectively.
+262 KJ mol−1
−262 KJ mol−1
+42 KJ mol−1
−42 KJ mol−1
A metal M displaces zinc from ZnCl, solution. This shows that
electrons flow from zinc to M
M is more electropositive than zinc
M is more electronegative than zinc
zinc is more electropositive than M
What number of moles of Cu2+ will be deposited by 360 coulombs of electricity? [F = 96500 C mol−1]
5.36 × 10−4 mol
1.87 × 10−3 mol
9.35 × 10−4 mol
3.73 × 10−3 mol
2Na2O2(s) + 2H2O2(I) → 4NaOH(s) + O2(s). Which substance is oxidized?
2NaO2(s)
NaOH(aq)
H2O(l)
O2(g)
