Write word equations and then balanced equations for the reaction taking place when -
$(a)$ dilute sulphuric acid reacts with aluminium powder.
$(b)$ dilute hydrochloric acid reacts with iron filings.
$(a)$ Sulphuric acid $+$ Aluminium $\rightarrow$ Aluminium sulphate $+$ Hydrogen
$3{{H}_{2}}S{{O}_{4(aq)}}\,+A{{l}_{(s)}}\to $ $A{{l}_{2}}{{(S{{O}_{4}})}_{3(aq)}}\,+\,3{{H}_{2(g)}}$
$(b)$ Hydrochloric acid $+$ Iron $\rightarrow$ Ferric chloride $+$ Hydrogen
$6 HCl _{(a q)}+2 Fe _{(s)} \longrightarrow 2 FeCl_{3(aq)}+3 H _{2(g)}$
Name the substance which on treatment with chlorine yields bleaching powder.
Why does distilled water not conduct electricity, whereas rain water does ?
What effect does the concentration of $H^+_{(aq)}$ ions have on the nature of the solution ?
Fresh milk has a $pH$ of $6$. How do you think the $pH$ will change as it turns into curd ? Explain your answer.
You have been provided with three test tubes. One of them contains distilled water and the other two contaln an acidic solution and a basic solution, respectlvely. If you are glven only red litmus paper. how will you identify the contents of each test tube ?