CBSE Class 10 CBSE Class 10 -مايو 31, 2022 1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Given the chemical equations of reactions, the name and the colour of the products formed in each case
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Identify the type of each of the following reactions. Also write balanced chemical equation for each reaction
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Mention with reason the colour changes observed when: (i) silver chloride is exposed to sunlight. (ii) copper powder is strongly heated in the presence of oxygen. (iii) a piece of zinc is dropped in copper sulphate solution
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 While studying the double displacement reaction, the solutions of barium chloride and sodium sulphate are mixed together
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Rahul has been collecting copper coins and silver coins. One day he observed a green coating on copper coins and a black coating on silver coins. State the chemical phenomenon responsible for these coating and also write chemical names of each coating
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solution of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tube C and D containing aqueous solution of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change? On the basis of this experiment state which one is the most reactive metal and why?
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 What is observed when a solution of sodium sulphate is added to a solution of barium chloride in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 What would a student report nearly after 30 minutes of placing duly cleaned strips of aluminium, copper, iron and zinc in freshly prepared iron sulphate solution taken in four beakers?
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 In the experimental set up to show that ’’CO₂ is given out during respiration’’, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution: [CBSE Delhi, Set 1, 2020] (A) exchange of atoms takes place (B) exchange of ions takes place (C) a precipitate is produced (D) an insoluble salt is produced
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Calcium oxide reacts vigorously with water to produce slaked lime. CaO(s) + H₂O(l) → Ca(OH)₂(aq) This reaction can be classified as: (A) Combination reaction (B) Exothermic reaction (C) Endothermic reaction (D) Oxidation reaction [CBSE Delhi, Set 1, 2020]
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 In which of the following, the identity of initial substance remains unchanged?
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 What was the nationalist message of Swadeshi regarding advertisements?
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Which product in India dominated the international market before the age of machine industries?
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Who were the competitors of the East India Company in the textile industry in the eighteenth century?
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 How did a wave of economic nationalism strengthen the wider nationalist sentiment growing in Europe? Explain
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 ‘The development of nationalism did not come about only through wars and territorial expansion.’
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Who was Count Camillo de Cavour? Mention his contributions
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Explain how did the 18th and 19th-century artist begin personifying a nation in allegory
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 The Balkan issue became one of the major factors responsible for the First World War. Explain by giving examples
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Describe any four features of the Vienna Treaty of 1815 in Brief
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Otto von Bismarck was the architect of ‘German unification.’ Explain
CBSE Class 10 CBSE Class 10 -مايو 31, 2022 Like Germany, Italy too had a long history of political fragmentation. Justify
CBSE Class 10 CBSE Class 10 -مايو 30, 2022 Describe any three consequence of liberal revolution of 1848