![]() ![]() (a) Hydrogen gas combines with nitrogen to form ammonia. Translate the following statements into chemical equations and then balance them. Solution : The reaction in which the number of atoms of each element is equal on the reactant side and product side is called balanced equation.Ĭhemical reaction should be balanced because only a balanced equation tells us the relative quantities of different reactants and products involved in the reaction.ġ3. What is a balanced chemical equation? Why should chemical equations be balanced? Solution : (a) Hydrogen gas and iron chloride are produced. (b) Chlorine gas and iron hydroxide are produced. (a) Hydrogen gas and iron chloride are produced. What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer. Solution : This is an example of displacement reaction because Fe in FeO 3 has been displaced by Al. Solution : As statement (a) and (b) are incorrect, answer (i) is correct. Which of the statements about the reaction below are incorrect? (ii) Copper oxide (CuO) is reduced to copper (Cu) while hydrogen(H 2) gets oxidised to waterH 2Oĩ. (i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced. Identify the substances that are oxidised and the substances that are reduced in the following reactions. Solution : Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride. Give an example of a double displacement reaction other than the one given in Activity 1.10. Solution : When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour.ħ. Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Thus two molecules of water on electrolysis give two molecules of hydrogen gas and one molecule of oxygen gas or in other words the amount of hydrogen gas collected would be double than that of oxygen gas.Ħ. In Activity 1.7, water is electrolysed to give H 2 gas at one electrode and O 2 gas at the other electrode. This is because water contains 2 parts of hydrogen element as compared to only 1 part of oxygen element. Solution : The gas which is collected in double the amount in the electrolysis of water experiment is hydrogen. Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas. (ii) Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime).ĥ. (ii) Write the reaction of the substance ‘X’ named in (i) above with water. (i) Name the substance ‘X’ and write its formula. A solution of a substance ‘X’ is used for whitewashing. (i) BaCl 2 (aq) + Na 2SO 4 (aq) → BaSO 4 (s) + 2NaCl (aq) (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. Write a balanced chemical equation with state symbols for the following reactions. (iii) Sodium + Water → Sodium hydroxide + Hydrogen (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (i) Hydrogen + Chlorine → Hydrogen chloride Write the balanced equation for the following chemical reactions. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air.Ģ. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. Solution : Magnesium is very reactive metal. Why should a magnesium ribbon be cleaned before burning in air? Here all chapter lists with detailed examples for NCERT Solution for Class 10 Science.ġ. NCERT Solutions are accessible in PDF format on Physics. NCERT Solutions for class-10 Science chapter 1 Chemical Reactions and Equations is prepared by senior and renown teachers of Physics Wallah primary focus while solving science questions of class-10 is NCERT textbook, read the theory of this chapter and try to understand the meaning and then after start writing the questions given in class-10 NCERT textbook for the chapter 1. ![]() NCERT Solutions for Class 10 Science chapter-1 Chemical Reactions and Equations ![]()
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