The question is incomplete, the complete question is;
Which balanced equation represents an oxidation-reduction reaction
A) AgNO3(aq) + NaCI(aq) ------>AgCI(s) + NaNO3(aq)
B) H2CO3(aq) -------> H2O(l) + CO2(g)
C) NaOH(aq) + HCl(aq) ----------> NaCl(aq) + H2O(l)
D) Mg(s) + 2HCl(aq) -------->MgCl2(aq) + H2(g)
Answer:
D) Mg(s) + 2HCl(aq) -------->MgCl2(aq) + H2(g)
Explanation:
Redox reaction is a type of chemical reaction in chemistry in which the oxidation states of atoms are changed. Redox reactions are characterized by an actual transfer of electrons between chemical species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Thus Oxidation-reduction reaction, refers to any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes.
If we look at option D very closely, the reaction is written as;
Mg(s) + 2HCl(aq) -------->MgCl2(aq) + H2(g)
We can clearly see that from left to right;
The oxidation number of magnesium increased from zero to +2
Oxidation number of hydrogen decreased from +1 to zero.
Hence option D depicts an oxidation-reduction reaction.
The answer is the first one
Hey there,
<span>The correct answer is Snow. Snow is a solid form of Liquid. </span>
If we added heat to the system, it would push to produce more and more NH3(g) and energy. However, the problem says the temp of this system is decreased, which means they react to produce more and more N2(g) and H2(g). Therefore, the concentration of H2(g) and the concentration of N2(g) both increase, and statement (1) is correct.
Hope this would help :))