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Class 9 Chemistry Electrochemistry


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19.Inelectroplatingofchromiumwhichsaltisusedasanelectrolyte?19. In electroplating of chromium which salt is used as an electrolyte?

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

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

2. Which one is Alloy.(a) Graphite(b) Mercury(c) Steel(d) Water
2. Which one is Alloy.(a) Graphite(b) Mercury(c) Steel(d) Water

2.WhichoneisAlloy.(a)Graphite(b)Mercury(c)Steel(d)Water2. Which one is Alloy.(a) Graphite(b) Mercury(c) Steel(d) Water

(c) Calculate the oxidation number of chromium in the following compounds.(i) \mathrm{CrCl}_{3}
(c) Calculate the oxidation number of chromium in the following compounds.(i)  \mathrm{CrCl}_{3}

(c)Calculatetheoxidationnumberofchromiuminthefollowingcompounds.(i)CrCl3(c) Calculate the oxidation number of chromium in the following compounds.(i) \mathrm{CrCl}_{3}

4. What is Alloy? Explain its classification with examples.
4. What is Alloy? Explain its classification with examples.

4.WhatisAlloy?Explainitsclassificationwithexamples.4. What is Alloy? Explain its classification with examples.

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}
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}

9.lgequivalentweightofAlisequalto(a)9 g(b)27 g(c)54 g(d)lg9. \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}

Q.15 Will the reaction be spontaneous for the following set of half reactions.What will be the value of E_{\text {cell }} ?(i) \mathrm{Cr}^{3+}{ }_{(\mathrm{aq})}+3 \mathrm{e}^{-} \rightarrow \mathrm{Cr}_{(\mathrm{s})} (ii) \mathrm{MnO}_{2(3)}+4 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}{ }_{\text {(a) })}+2 \mathrm{H}_{2} \mathrm{O}_{(0)} (Standard reduction potential for reaction(i) =-0.74 \mathrm{~V} and for the reaction (ii) =+1.28 \mathrm{~V} ).
Q.15 Will the reaction be spontaneous for the following set of half reactions.What will be the value of  E_{\text {cell }}  ?(i)  \mathrm{Cr}^{3+}{ }_{(\mathrm{aq})}+3 \mathrm{e}^{-} \rightarrow \mathrm{Cr}_{(\mathrm{s})} (ii)   \mathrm{MnO}_{2(3)}+4 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}{ }_{\text {(a) })}+2 \mathrm{H}_{2} \mathrm{O}_{(0)} (Standard reduction potential for reaction(i)  =-0.74 \mathrm{~V}  and for the reaction (ii)  =+1.28 \mathrm{~V}  ).

Q.15Willthereactionbespontaneousforthefollowingsetofhalfreactions.WhatwillbethevalueofEcell ?(i)Cr3+(aq)+3eCr(s)(ii)MnO2(3)+4H++2eMn2+(a) )+2H2O(0)(Standardreductionpotentialforreaction(i)=0.74 Vandforthereaction(ii)=+1.28 V).Q.15 Will the reaction be spontaneous for the following set of half reactions.What will be the value of E_{\text {cell }} ?(i) \mathrm{Cr}^{3+}{ }_{(\mathrm{aq})}+3 \mathrm{e}^{-} \rightarrow \mathrm{Cr}_{(\mathrm{s})} (ii) \mathrm{MnO}_{2(3)}+4 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}{ }_{\text {(a) })}+2 \mathrm{H}_{2} \mathrm{O}_{(0)} (Standard reduction potential for reaction(i) =-0.74 \mathrm{~V} and for the reaction (ii) =+1.28 \mathrm{~V} ).

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