Question

Which equation describes a physical change? i. H2O(s) ⟶ H2O(l) ii. Na+(aq)+Cl−(aq) +Ag+(aq)+NO3−(aq) ⟶ AgCl(s)+Na+(aq)+NO3−(aq) iii. CH3OH(g)+O2(g) ⟶ CO2(g)+H2O(g) iv. 2H2O(l) ⟶ 2H2(g)+O2(g) v. H+(aq)+OH−(aq)⟶ H2O(l)

Answer 1

Answer:

The answer is "Option i"

Explanation:

In this question, only option (i) is correct, and others were wrong which can be defined as follows:

In option (ii):

$Na^+\ (aq)+Cl^- \ (aq) +Ag^+ \ (aq)+NO_3^- \ (aq) \to AgCl\ (s)+Na^+ \ (aq)+NO_3^-\ (aq)$

It is the complete ionic equation.

In option (iii):

$CH_3OH\ (g)+O_2\ (g) \to CO_2\ (g)+H_2O\ (g)$

It is the combustion reaction but a not balanced equation.

In option (iv):

$2H_2O\ (l) \to 2H_2\ (g)+O_2\ (g)$

It is the  decomposition equation.

In option (v):

$H^+\ (aq) +OH^-\ (aq)\to H_2O\ (l)$

It is the complete ionic equation.