NEET-XII-Physics
33: Thermal and Chemical Effects of Electric Current
- #20-aWhat is the atomic weight of the trivalent metal? (b) How much silver is deposited during this period? Atomic weight of silver is 107.9 g mol-1. (b) How much silver is deposited during this period? Atomic weight of silver is 107.9 g mol-1.Ans : Using the formula, m = Zit, we get:
`` 1\times {10}^{-3}=\frac{\,\mathrm{\,Atomic\,}\,\mathrm{\,weight\,}}{3\times 96500}\times 2\times 5400``
`` \Rightarrow \,\mathrm{\,Atomic\,}\,\mathrm{\,weight\,}=\frac{3\times 96500\times {10}^{-3}}{2\times 5400}=26.8\times {10}^{-3}\,\mathrm{\,kg\,}/\,\mathrm{\,mole\,}``
`` \Rightarrow \,\mathrm{\,Atomic\,}\,\mathrm{\,weight\,}=26.8\,\mathrm{\,g\,}/\,\mathrm{\,mole\,}`` (b) Using the relation between equivalent mass and mass deposited on plates, we get:
`` \frac{{E}_{\mathit{1}}}{{E}_{\mathit{2}}}=\frac{{m}_{1}}{{m}_{2}}``
`` \Rightarrow \frac{26.8}{3\times 107.9}=\frac{1}{{m}_{2}}``
`` \Rightarrow {m}_{2}=12.1\,\mathrm{\,g\,}``
`` ``
Page No 219: (b) Using the relation between equivalent mass and mass deposited on plates, we get:
`` \frac{{E}_{\mathit{1}}}{{E}_{\mathit{2}}}=\frac{{m}_{1}}{{m}_{2}}``
`` \Rightarrow \frac{26.8}{3\times 107.9}=\frac{1}{{m}_{2}}``
`` \Rightarrow {m}_{2}=12.1\,\mathrm{\,g\,}``
`` ``
Page No 219:
- #20-bHow much silver is deposited during this period? Atomic weight of silver is 107.9 g mol-1.Ans : Using the relation between equivalent mass and mass deposited on plates, we get:
`` \frac{{E}_{\mathit{1}}}{{E}_{\mathit{2}}}=\frac{{m}_{1}}{{m}_{2}}``
`` \Rightarrow \frac{26.8}{3\times 107.9}=\frac{1}{{m}_{2}}``
`` \Rightarrow {m}_{2}=12.1\,\mathrm{\,g\,}``
`` ``
Page No 219: