$Fe _{2} O _{3}+2 Al \rightarrow Al _{2} O _{3}+2 Fe$
The above reaction is an example of a
combination reaction.
displacement reaction.
decomposition reaction.
double displacement reaction.
Why is the amount of gas collected in one of the test tubes in image double of the amount collected in the other ? Name this gas.
What happens when dilute hydrochloric acid is added to iron fillings ? Tick the correct answer.
Write a balanced chemical equation with state symbols for the following reactions.
$(i)$ Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
$(ii)$ Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
A shiny brown coloured element $‘X’$ on heating in air becomes black in colour. Name the element $‘X’$ and the black coloured compound formed.
Give an example of a double displacement reaction other than the one given in image.