Reason(R): Cu is a less reactive metal. In the course of this reaction, CuO is reduced to copper metal. Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 6 (Redox Reactions) include all questions with solution and detail explanation. Therefore, K is oxidised while F2 is reduced. Oxidation is the gain of oxygen or the loss of electrons. When we burn magnesium in oxygen, magnesium oxide is formed. (i). The electrons that are lost in the oxidation reaction are the same electrons that are gained in the […] We define: Oxidation is the loss of electrons from an atom or ion. They are used to see what has been oxidised/reduced in a redox reaction. (b) Write an ionic equation for the reaction that takes place. Cu in CuO lost 2 electrons when converted to Cu(s). this reaction is a reduction reaction as CuO lost oxygen to form Cu. a. MgO +H2CO3 --> MgCO3 + H2O b. (b) Fe 2 O 3(s) + 3CO (g) → 2Fe (s) + 3CO 2(g) Cu is +2 and goes to +1, gain of 1 e- , reduction. a redox reaction takes place when something has been oxidised and another has been reduced. Reduction is the gain of electrons by an atom or ion. the second looks wrong cuz the equation is not balanced and hg and Cl both stay at the same oxidation number so it is not redox. CuO (s) + H2 (g) >Cu (s) + H2O (l) (A) It is a redox reaction, because (B) The reducing agent in this reaction is Ans: 5 This reaction takes place in the blast furnace: Fe2O3 (s) + 3CO ( g) > 2Fe (l) + 3CO2 ( g) (A) The word equation for the reaction is (B)It is a redox reaction, because (C) The reducing agent in this reaction is reduction= gain of electrons. Identify it in the reaction. Get an answer for 'Mg(s) + CuO(s)---> MgO(s) + Cu(s) Explain as fully as you can why the reverse reaction does not occur.' a) Assign oxidation numbers for each atom in the equation. It'd just be H2O in that case... Hope this helps Redox reactions — reactions in which there’s a simultaneous transfer of electrons from one chemical species to another — are really composed of two different reactions: oxidation (a loss of electrons) and reduction (a gain of electrons). Solution: Option (iv) is the answer. A redox reaction is nothing but both oxidation and reduction reactions taking place simultaneously. Hence, this reaction is a redox reaction. Single displacement. CuO + H2 reactants Cu +H2O products. The first reaction. One element gets oxidized and the other gets reduced. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Thus, H 2 is the reducing agent in this reaction, and CuO acts as an oxidizing agent. Label the reactants and products CuO + H2-->Cu +H2O. A redox reaction is deemed to occur if there is a transfer of electron(s) during the reaction. Here, the nitrate ion will swap between the Ag and the Cu. All _____ reactions can be classified as a redox reaction as well ... CuO + H2-->Cu +H2O. The more positive the value of Eᶱ, the greater is the tendency of the species to get reduced. The first 2 are because if you use oxidation numbers you will see that some go from 0-> 1 and stuff like that. This occurs because the oxidation state of the elements changes as a result of the reaction. When we remove oxygen from a compound we say that it has been reduced. Here, the oxidation number of Cu decreases from +2 in CuO to 0 in Cu i.e., CuO is reduced to Cu. In (b), the copper(II)oxide is reduced to copper metal by the hydrogen gas, which removed the oxygen from it to form water. Assertion: (A) CuO + H2 → Cu + H2O is a redox reaction . Explain why this is not a redox reaction: CuO (s) + H2SO4 (aq) ----->CuSO4 (aq) + H2O (I) Ans: 8 (a) The table shows one period of the Periodic Table. Rusting is an oxidation reaction. It is an example of double decomposition reaction. CuO was oxidized. Reactants-carbon and oxygen Products-carbon dioxide. Which of these are redox reactions and for those that are redox reactions what is the half-reaction and is the half-reaction oxidation or reduction? The S maintains the same charge throughout--don't be confused by the multiple forms of S (sulfate and sulfite). `CuO(s) + H_2(g) -> Cu(s) + H2O(l)` In this reaction, copper (II) oxide reacts with hydrogen to generate copper metal and water. Redox reactions can take place even if no oxygen or hydrogen is involved. What is a good definition for a redox reaction? 1 answer. CuO + H2→ Cu + H2O (ii) Fe2O3 + 3CO → 2Fe + 3CO2 (iii) 2K + F2→ 2KF (iv) BaCl2 + H2SO4→ BaSO4 + 2HCl. Explain why. 2. Oxidation is the gain of O or loss of H. Reduction is the loss of O or gain of H. Oxidation and reduction always occur together, even though they can be written as separate chemical equations. Chemical reactions in which oxygen and/or hydrogen are transferred are called oxidation-reduction, or redox, reactions. Here, the oxidation number of Cu decreases from +2 in CuO to 0 in Cu i.e., CuO is reduced to Cu. CuCO3 → CuO + CO2 8 Fe + S8 → 8 FeS CsClO3 → CsCl + O2 H2O + SO3 → H2SO4 Ca(HCO3)2 → CaCO3 + H2O + CO2 I really don't know how to tell the difference so I'd appreciate an answer that doesn't just answer the question but explains why. Think of it this way - the Cu's oxidation state on the reactant side is 0, but shifts to +2 to balance the charge on the copper nitrate ion as a product (oxidation - loses electrons). (i). b) CuO + H2 ---> Cu + H2O (reduction) From the above examples, carbon undergoes oxidation to carbon(IV)oxide in (a) because oxygen was added to it. and find homework help for other Science questions at eNotes 2. 8.3 Justify that the following reactions are redox reaction Oxidation= loss of electrons. (b) Let us write the oxidation number of each element in the given reaction … Which of the following is not an example of redox reaction? CuO+HCl---> CuCl2+ H2O. Here, each K atom as lost one electron to form K+ while F2 has gained two electrons to form two F– ions. Oxidation number (also called oxidation state) is a measure of the degree of oxidation of an atom in a … 1. #chemistrybyvalli#redoxreaction#cuo+h2--cu+h2o#chemistrybyvalli (a) What colour does the solution go, and why? 2. asked Jun 8, 2018 in Chemistry by rubby (51.7k points) redox reaction; class-11; Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to … CuO + H2→ Cu + H2O (ii) Fe2O3 + 3CO → 2Fe + 3CO2 (iii) 2K + F2→ 2KF (iv) BaCl2 + H2SO4→ BaSO4 + 2HCl Solution: Option (iv) is the answer. Thanks. asked Jun 8, 2018 in Chemistry by rubby (51.7k points) redox reaction; class-11; 0 votes. In the reverse reaction (if its being considered, Cu gains two electrons to form CuO) C. or none of the above if your not considering reverse reactions. Solution for CuO + H2 ⇌ Cu + H2O CO2 + H2 ⇌ 2CO + H2O H2 + F2 ⇌ 2 HF Fe + O2 ⇌ Fe2O3 NaOH + HCl NaCl + H2O 2KN03--> 2KNO2 + O2 C. H2 + CuO --> Cu + H2O D. HNO3 --> N2O5 + H20 E. NaOH +HCl --> NaCl +H20 F. H2 +Cl2 --> 2HCl g. SO3 + H2O --> H2SO4 H. Fe + HCl --> FeCl3 + H2 i BaF2 ---> Ba + F2 j. Which of the following is not an example of redox reaction? Questions from JIPMER 2012 Assertion: (A) CuO + H2 → Cu + H2O is a redox reaction . 34. A reagent that is an electron donor in a reaction, and gets oxidised in order for another species to become reduced. ... goes under an oxidation reaction to give out a black color substance that is a copper oxide (CuO). This will clear students doubts about any question and improve application skills while preparing for board exams. Many know me as the Ten Year Series book author for JC A-Level H2 Chemistry and O-Level Pure Chemistry. We say that magnesium has been oxidised - it has gained oxygen. 3. The reaction is the Na and H2 swap from sulfate to sulfite, and then the H2SO3 splits into H2O(l) and SO2(g). oxygen and hydrogen are now sharing, they were O at … Why do we store silver chloride in dark coloured bottles? Hence, this reaction is a redox reaction. Redox reactions. 2HNO3(aq) + CuO(s) Cu(NO3)2(aq) + H2O(l) False Cu stays at +2 in CuO and Cu(NO3)2, and N stays at +5 in HNO3 and Cu(NO3)2. Thus, it is a redox reaction. (c) The copper is said to be oxidized during this reaction. My 19+ years of coaching experience (since 1999) with more than 1500 students from 180+ JCs and Secondary Schools has allowed me to understand the true reasons why students are not able to perform well in Chemistry. (2 points) Based on the balanced equations of Question 1, if you used 85.0 mg of copper in the initial reaction, calculate the exact amount of zinc required to complete the reaction in The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Also, the oxidation number of H increases from 0 in H 2 to +1 in H 2 O i.e., H 2 is oxidized to H 2 O. Reason(R): Cu is a less reactive metal. 17. Oxygen is getting removed from water (H2O) hence it is getting reduced. The more positive the value of Eᶱ, the greater is the tendency of the species to get reduced. CuO + H2 → Cu + H2O is a oxidation-reduction reaction (redox). Further, H is added to BCl3 but is removed from LiAlH4, therefore, BC13 is reduced while LiAlH4 is oxidised. Fluorine reacts with ice and results in the change. 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