question_answer

Four students studied reactions of zinc and sodium carbonate with dilute hydrochloric acid and dilute sodium hydroxide solutions and presented their results as follows. The \[(\uparrow )\] shows evolution of gas and \[(-)\] shows no reaction. The right set is:
(a)		\[Zn\]	\[N{{a}_{2}}C{{O}_{3}}\]
	HCl	√	√
	NaOH	√	√
(b)		\[Zn\]	\[N{{a}_{2}}C{{O}_{3}}\]
	HCl	-	√
	NaOH	√	√
(c)		\[Zn\]	\[N{{a}_{2}}C{{O}_{3}}\]
	HCl	√	√
	NaOH	√	-
(d)		\[Zn\]	\[N{{a}_{2}}C{{O}_{3}}\]
	HCl	√	-
	NaOH	√	√

 

Answer:

(c)		\[Zn\]	\[N{{a}_{2}}C{{O}_{3}}\]
	HCl	√	√
	NaOH	√	-