# First Year Chemistry Electrochemistry

Change the way you learn with Maqsad's classes. Local examples, engaging animations, and instant video solutions keep you on your toes and make learning fun like never before!

$9. \mathrm{lg} equivalent weight of \mathrm{Al} is equal to(a) 9 \mathrm{~g} (b) 27 \mathrm{~g} (c) 54 \mathrm{~g} (d) \mathrm{lg}$

$(b) Balance the following equations by oxidation number method(iii) \mathrm{Br}_{2}+\mathrm{NaOH} \rightarrow \mathrm{NaBr}+\mathrm{NaBrO}_{3}+\mathrm{H}_{2} \mathrm{O}$

$(b) Balance the following ionic equations by ion-electron method.(iv) \mathrm{Cu}+\mathrm{NO}_{3}^{1-} \rightarrow \mathrm{Cu}^{2+}+2 \mathrm{NO}_{2}$

$Q.1 Multiple choice questions.(v) If a strip of Cu metal is placed in a solution of \mathrm{FeSO}_{4} :(a) Cu will be deposited(b) Fe is precipitated out(c) Cu and Fe both dissolve(d) No reaction take place$

$21. In electroplating of silver from where \mathrm{Ag}^{+} ions come and where they deposit?$

$(b) Balance the following equations by oxidation number method(ix) \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{MnO}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{MnSO}_{4}+\mathrm{H}_{2} \mathrm{O}+\mathrm{Cl}_{2}$