CBSE COMPLEMENTARY MATERIAL|Exercise UNIT TEST|8 Videos
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The surface of copper gets tarnished by the formation of copper oxide. N_(2) gas was passed to prevent the oxide formation during heating of copper at 1250 K. However, the N_(2) gas contains 1 mole % of water vapour as impurity. The water vapour oxidises copper as per the reaction given below: 2Cu(s) + H_(2)O(g) rarr Cu_(2)O(s) + H_(2)(g) is the minimum partial pressure of H2 (in bar) needed to prevent the oxidation at 1250 K. The value of ln is ____. (Given: total pressure = 1 bar, R (universal gas constant) = 8 J K−1 mol^(−1), ln(10) = 2.3. Cu(s) and Cu_(2)O(s) are mutually immiscible. At 1250 K: 2Cu(s) + 1//2 O_(2)(g) rarr Cu_(2)O(s) triangle H^(theta) = − 78,000 J mol^(−1) H_(2)(g) + 1//2 O_(2)(g) rarr H_(2)O(g), triangle G^(theta) = − 1,78,000 J mol^(−1) , G is the Gibbs energy
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)
CBSE COMPLEMENTARY MATERIAL-REDOX REACTIONS -UNIT TEST
