Science
- What is photosynthesis process? Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy in the... 1
- what would be consequences of deficiency of haemoglobin in body Haemoglobin is a critical component of our blood as it is responsible for transporting oxygen from the lungs to the body's tissues and organ... 1
- What is definition of light Light is defined as the electromagnetic radiation with wavelength between 380 nm and 750 nm which is visible to the human eye or makes objec... 1
- Give an example of a double displacement reaction other than the one given in Activity 1.10 Reaction Between silver nitrate (AgNO3) and Sodium chloride (NaCl) is an example of double displacement reaction. Here Silver donates its io... 1
- 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, iron displaces copper from the copper sulphate because iron is more reactive than... 1
- 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 In activity 1.7, gas collected in one of the test tubes is double of the amount collected in the other because water gets hydrolysed to rele... 2
- Write the reaction of the substance ‘X’ named in (i) above with water CaO + H2O → Ca(OH)2 2
- Name the substance ‘X’ and write its formula. The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide and its formula is CaO. 1
- Sodium hydroxide solution in water reacts with hydrochloric acid solution to produce Sodium chloride solution and water. NaOH + HCl → NaCl + H₂O 2
- Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and solution of Sodium chloride. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl 2
- Write a balanced equations for the following chemical reactions. i) H2 + Cl2 → 2HCl ii)3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4 iii) 2Na + 2H2O → 2NaOH + 2
- Why should a magnesium ribbon be cleaned before burning in air? Magnesium rubber should be cleaned before burning in air because Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxid... 1