No observable change is noticed when dilute hydrochoric acid is added to :
(1) sodium hydroxide solution
(2) sodium carbonate solution
(3) blue litmus solution
(4) zinc metal

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Solution

When dilute hydrochloric acid is treated with sodium hydroxide, it forms a salt and water. Neither colour change nor the precipiate formation is observed during this reaction.
$HCl (aq) + NaOH (aq) \to NaCl (aq) + H_{2} O (l)$

Hence, the correct answer is option 1.

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No observable change is noticed when dilute hydrochoric acid is added to : (1) sodium hydroxide solution (2) sodium carbonate solution (3) blue litmus solution (4) zinc metal

When dilute hydrochloric acid is treated with sodium hydroxide, it forms a salt and water. Neither colour change nor the precipiate formation is observed during this reaction. HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l) Hence, the correct answer is option 1.

No observable change is noticed when dilute hydrochoric acid is added to :
(1) sodium hydroxide solution
(2) sodium carbonate solution
(3) blue litmus solution
(4) zinc metal

When dilute hydrochloric acid is treated with sodium hydroxide, it forms a salt and water. Neither colour change nor the precipiate formation is observed during this reaction.
$HCl (aq) + NaOH (aq) \to NaCl (aq) + H_{2} O (l)$

Hence, the correct answer is option 1.