Write word equations and then balanced equations for the reaction taking place when -
$(a)$ dilute sulphuric acid reacts with zinc granules.
$(b)$ dilute hydrochloric acid reacts with magnesium ribbon.
$(a)$ Sulphuric acid $+$ Zinc $\rightarrow$ zinc sulphate $+$ Hydrogen
${{H}_{2}}S{{O}_{4(aq)}}\,+Z{{n}_{(s)}}\to ZnS{{O}_{4(aq)}}\,+\,{{H}_{2(g)}}$
$(b)$ Hydrochloric acid $+$ Magnesium $\rightarrow$ Magnesium chloride $+$ Hydrogen
$2HC{{l}_{(aq)}}+M{{g}_{(s)}}\to MgC{{l}_{2(aq)}}+{{H}_{2(g)}}$
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 ?
A solution turns red litmus blue, its $pH$ is likely to be
What is the common name of the compound $CaOCl_2$ ?
Why should curd and sour substances not be kept in brass and copper vessels ?
Name the sodium compound which is used for softening hard water.