A yellowish coloured compound 'A' is photosensitive material. On exposure to sunlight, it gives a greyish substance 'B' and brown fumes of a gas 'C'. Identify A, B and C. How will you obtain A from the nitrate salt of B?

A substance 'A' displaces 'B' from its solution in water. It is called displacement reaction. What other chemical name can be given to such type of reactions? Explain with an example.

In the reaction:
2KClO₃ \(\overset { \Delta/MnO_2 }{ \rightarrow } \) 2KCl + 3O₂, what does the '\(\Delta\)' and 'MnO₂' signify? What type of reaction is this?

A metal X available in the form of ribbon burns in air with a dazzling white light once heated to its ignition temperature. It leaves a white powder Y which dissolves in water. The solution so formed turns red litmus blue. Identify X and Y and write a balanced chemical equation of the reaction.
(a) Identify 'X' and 'Y'.
(b) Write a balanced chemical equation for this reaction.

A pinch of solid sodium carbonate is added into dilute hydrochloric acid in a test tube. Sodium chloride and water formed remains the solution whereas the carbon dioxide escapes out. The tube found to become hot.
(a) Represent it in word equation.
(b) Give the formula of the word equation.
(c) Balance the equation.
(d) How will the reaction be represented to make it maximum informative?