Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
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Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
What is the common name of the compound CaOCl2
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be (a) Calcium (b) Carbon (c) Silicon (d) Iron
Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2(g) (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced.
Give any two ways in which non-biodegradable substances would affect the environment.
With the help of an example explain how genes control characteristics or trait.
Differentiate between metal and non-metal on the basis of their chemical properties.
Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.