All questions

• Balance the following chemical equations. (i) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O (i) 2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O (ii) 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O (iii) NaCl + AgNO₃ → AgCl + NaNO₃ (iv) BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl Chemical Reactions and Equations 1 answer
• Translate the following statements into chemical equations and then balance them. (a) 3H₂ (g) + N₂ (g) → 2NH₃ (g) (b) 2H₂S (g) + 3O₂ (g) → 2H₂O (l) + 2SO₂ (g) (c) 3BaCl₂ (aq) + Al₂(SO₄)₃ (aq) → 2AlCl₃ (aq) + 3BaSO₄ (s) (d)... Chemical Reactions and Equations 1 answer
• What is a balanced chemical equation? Why should chemical equations be balanced? A reaction which has an equal number of atoms of all the elements on both sides of the chemical equation is called a balanced chemical equat... Chemical Reactions and Equations 1 answer
• What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer. Correct option is a) Hydrogen gas and iron chloride are produced. Chemical Reactions and Equations 1 answer
• Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of a Correct option is d) displacement reaction. Chemical Reactions and Equations 2 answers
• Which of the statements about the reaction below are incorrect? 2PbO (s) + C (s) → 2Pb (s) + CO2 (g) Correct option is (i) (a) and (b) Chemical Reactions and Equations 2 answers
• Identify the substances that are oxidised and the substances that are reduced in the following (i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced. (ii) Copper oxide (CuO) is reduced to copper (Cu) while hydrogen (H₂... Chemical Reactions and Equations 1 answer
• Give an example of a double displacement reaction other than the one given in Activity 1.10. Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride. Na₂CO₃+CaCl₂→ CaCO₃+2NaCl In this reaction, sod... Chemical Reactions and Equations 1 answer
• Why does the colour of copper sulphate solution change when an iron nail is dipped in it? When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive t... Chemical Reactions and Equations 1 answer
• Why is the amount of gas collected in one of the test tubes in Activity 1.7 double Water contains two parts of hydrogen and one part oxygen. Therefore, during the electrolysis of water the amount of hydrogen gas collected i... Chemical Reactions and Equations 1 answer
• A solution of a substance ‘X’ is used for white washing. (i) The substance 'X' is calcium oxide. Its chemical formula is CaO. (ii) Calcium oxide reacts vigorously with water to form calcium hydroxi... Chemical Reactions and Equations 1 answer
• Write the reaction of the substance ‘X’ named in (i) above with water. Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime). CaO (s) + H₂O (l) → Ca(OH)₂ (aq) Calcium Oxide (Quick Li... Chemical Reactions and Equations 2 answers
• (i) Name the substance ‘X’ and write its formula. The substance 'X' is calcium oxide. Its chemical formula is CaO. Chemical Reactions and Equations 1 answer
• Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) (ii) NaOH (aq) + HCl (aq) → NaCL (aq) + H₂O (l) Chemical Reactions and Equations 2 answers
• Solutions of barium chloride and sodium sulphate in water react to give insoluble barium (i) BaCl₂ (aq) + Na₂SO₄ (aq) → BaSO₄ (s) + 2NaCl (aq) Chemical Reactions and Equations 2 answers
• Write the balanced equation for the following chemical reactions. (i) H₂ (g) + Cl₂ (g) → 2HCl (g) (ii) 3BaCl₂ (s) + Al₂(SO₄)₃ (s) → 3BaSO₄ (s) + 2AlCl₃ (s) (iii) 2Na(s) + 2H₂O (l) → 2NaOH (aq) + H₂ (g) Chemical Reactions and Equations 1 answer
• Why should a magnesium ribbon be cleaned before it is burnt in air? Magnesium is a very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magn... Chemical Reactions and Equations 1 answer
• Computer Application solutions CBSE std 10th frankedu.com You can get all solutions on frankedu website Link-> https://www.frankedu.com/studentzonebook/1557119001-0llComputer%20Applications%20CBSE%2... Ask Doubt 1 answer
• The philosophy being followed by S and M is not followed by most other Correct option is (a) Optional Business Studies 2 answers
• As “The decision making authority is pushed down the chain of command” at S and M enterprises, Correct option is (a) There is no requirement for approval from many levels Business Studies 1 answer
• Quote the line from above which highlights the importance of the philosophy towards providing Correct option is (b) ‘Accelerate the development of talent’ Business Studies 1 answer
• The application of the philosophy discussed above can foster a sense of competition Correct option is (a) Facilitates growth Business Studies 2 answers
• ‘Why is there, need to apply the philosophy being followed by S&M, with caution? Correct option is (b) As it can cause disintegration of the organisation Business Studies 1 answer
• Identify the philosophy that is being followed by S&M through which it is dividing the decision Correct option is (b) Decentralization of authority; Business Studies 2 answers