In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
$\mathop {2AgN{O_{3(aq)}}}\limits_{Silver{\text{ }}nitrate} + \mathop {C{u_{(s)}}}\limits_{Copper} \to \mathop {Cu{{\left( {N{O_3}} \right)}_{2\left( {aq} \right)}}}\limits_{Copper{\text{ }}nitrate} + \mathop {2A{g_{(s)}}}\limits_{Silver} $
What happens when dilute hydrochloric acid is added to iron fillings ? Tick the correct answer.
Oil and fat containing food items are flushed with nitrogen. Why ?
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.
Write the balanced chemical equation for the following and identify the type of reaction in each case.
$(a)$ Potassium bromide $(aq)$ $+$ Barium iodide$(aq)$ $\rightarrow$ Potassium iodide$(aq)$ $+$ Barium bromide$(s)$
$(b)$ Zinc carbonate$(s)$ $\rightarrow$ Zinc oxide$(s)$ $+$ Carbon dioxide$(g)$
$(c)$ Hydrogen$(g)$ $+$ Chlorine$(g)$ $\rightarrow$ Hydrogen chloride$(g)$
$(d)$ Magnestum $(s)$ $+$ Hydrochloric acid$(aq)$ $\rightarrow$ Magnesium chloride$(aq)$ $+$ Hydrogen $(g)$
$Fe _{2} O _{3}+2 Al \rightarrow Al _{2} O _{3}+2 Fe$
The above reaction is an example of a