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Select from the following a decomposition reaction in which source of energy for decomposition is light :
What happens when : (write balanced chemical equation)
When acid present in tamarind is mixed with X, mixture Y is formed. When Y is mixed in the kneaded flour dough and heated, the cake formed becomes soft and spongy. X is prepared from common salt and is also used for faster cooking.
What is a chemical reaction ? Describe one activity each to show that a chemical change has occurred in which (i) change of colour, and (ii) change in temperature has taken place.
Define a decomposition reaction. How can we say that (I) electrolysis of water, and (II) blackening of silver bromide when exposed to sunlight, are decomposition reactions ? Mention the type of energy involved in each case.
The type of reactions in which (I) calcium oxide is formed, and (II) calcium hydroxide is formed are opposite reactions to each other. Justify this statement with the help of chemical equations.
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