Metal compound $A$ reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
$\underset{\begin{smallmatrix}
\text{Calcium} \\
\text{carbonate}
\end{smallmatrix}}{\mathop{CaC{{O}_{3(s)\,}}}}\,+\,\underset{Hydrochloricacid}{\mathop{2HCl}}\,\,\to $$\underset{Calcium\text{ }chloride\text{ }}{\mathop{CaC{{l}_{2(aq)}}}}\,\,+\,\underset{Carbon\text{ }dioxide}{\mathop{C{{O}_{2(g)}}}}\,$$\mathop { + {H_2}{O_{(l)}}}\limits_{water} $
Fresh milk has a $pH$ of $6$. How do you think the $pH$ will change as it turns into curd ? Explain your answer.
Why does distilled water not conduct electricity, whereas rain water does ?
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 ?
Why do $HCl$, $HNO_3$, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character ?
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.