26. The oxidation number of carbon in carbon dioxide is a. +4 d. +1 e. +2 27. Co

Question

26. The oxidation number of carbon in carbon dioxide is a. +4 d. +1 e. +2 27. Concentrated sulfuric acid contains 4 g of water for every 100 g of solution. The solvent is a. concentrated. b. water. d. the same as the solution. e. the same as the solute in this case. c. sulfuric acid 28. Magnesium hydroxide is insoluble. write the net ionic equation for the reaction that takes place between a solution of magnesium chloride and a solution of sodium hydroxide. a. Mg2 (aa) OH (aa)- MgoH(s) c. MgCl2(aq) NaOH (aq) MgoH (s) NaCl2(aq) 29. Which statement about the following chemical reaction is not correct? 2H2 O2 2H20 a. Four hydrogen molecules react with oxygen to produce two water molecules. b. Four hydrogen atoms combine with two oxygen atoms to produce two water molecules. c. For every two hydrogen molecules consumed, two water molecules are produced d. For every oxygen molecule consumed, two water molecules are produced e. Two hydrogen molecules react with one oxygen molecule.

Explanation / Answer

26) a) +4

Explanation : CO2 = x (C) + 2*-2 (O) = 0, x = +4

27) c) sulfuric acid

28) d) MgCl2(aq) + 2NaOH(aq) ---> Mg(OH)2 (s) + 2NaCl (aq)

29) a) Four Hydrogen molecules react with oxygen to produce two water molecule

Reason : It is not 4 Hydrogen molecule , It is 4 Hydrogen atom or 2 Hydrogen molecules

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