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Class 9 Chemistry Electrochemistry


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Fundamentals Of Chemistry

672 Doubt Solutions

Structure Of Atoms

1344 Doubt Solutions

Periodic Table And periodicity Of Properties

2016 Doubt Solutions

Structure Of Molecules

2688 Doubt Solutions

Physical States Of Matter

3360 Doubt Solutions

Solutions

4032 Doubt Solutions

Electrochemistry

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Chemical Reactivity

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Q.3Markthefollowingstatementstrueorfalse.(i)Inelectrolyticconductionelectronsflowthroughtheelectrolyte.(ii)Intheprocessofelectrolysistheelectronsintheexternalcircuitflowfromcathodetoanode.(iii)Sugarisanon−electrolyteinsolidformandwhendissolvedinwaterwillallowthepassageofanelectriccurrent.(iv)Ametalwillonlyallowthepassageofanelectriccurrentwhenitisincoldstate.(v)Theelectrolyticproductsofaqueouscopper(II)chloridesolutionarecopperandchlorine.Q.3 Mark the following statements true or false.(i) In electrolytic conduction electrons flow through the electrolyte.(ii) In the process of electrolysis the electrons in the external circuit flow from cathode to anode.(iii) Sugar is a non-electrolyte in solid form and when dissolved in water will allow the passage of an electric current.(iv) A metal will only allow the passage of an electric current when it is in cold state.(v) The electrolytic products of aqueous copper (II) chloride solution are copper and chlorine.
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)+3e−→Cr(s)(ii)MnO2(3)+4H++2e−→Mn2+(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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