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(a) Name the substance oxidised and reduced in the following reaction : $\ce{ZnO + C -> Zn + CO}$
(b) Balance the following chemical reaction : $\ce{Pb(NO3)2 + KI -> PbI2 + KNO3}$
(c) Give one example each of electrolytic decomposition and decomposition by sunlight.
(b) Balance the following chemical reaction : $\ce{Pb(NO3)2 + KI -> PbI2 + KNO3}$
(c) Give one example each of electrolytic decomposition and decomposition by sunlight.
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(a)
• Substance oxidised - $\ce{C}$ (½)
• Substance reduced - $\ce{ZnO}$ (½)
(b) $\ce{Pb(NO3)2 + 2 KI -> PbI2 + 2 KNO3}$ (1)
(c)
• $\ce{2H2O ->[electricity] 2H2 + O2}$ (½)
• $\ce{2AgCl ->[sunlight] 2Ag + Cl2}$ (½)
(any other example in each case)
• Substance oxidised - $\ce{C}$ (½)
• Substance reduced - $\ce{ZnO}$ (½)
(b) $\ce{Pb(NO3)2 + 2 KI -> PbI2 + 2 KNO3}$ (1)
(c)
• $\ce{2H2O ->[electricity] 2H2 + O2}$ (½)
• $\ce{2AgCl ->[sunlight] 2Ag + Cl2}$ (½)
(any other example in each case)