Given the equations A, B, C, and D:

(A) AgNO3 + NaCl → AgCl + NaNO3
(B) Cl2 + H2O → HClO + HCl
(C) CuO + CO → CO2 + Cu
(D) NaOH + HCl → NaCl + H2O

Which two equations represent redox reactions?

B and C

Explanation:

(A) AgNO₃ + NaCl → AgCl + NaNO₃

This is a double displacement reaction. It is not a redox reaction because the elements have the same oxidation numbers on both sides.

(B) Cl₂ + H₂O → HClO + HCl

This is a redox reaction.

Cl₂ is oxidized to HClO. The oxidation number of Cl increases from 0 to +1.

Cl₂ is reduced to HCl. The oxidation number of Cl decreases from 0 to -1.

(C) CuO + CO → CO₂ + Cu

This is a redox reaction.

CO is oxidized to CO₂. The oxidation number of C increases from +2 to +4.

CuO is reduced to Cu. The oxidation number of Cu decreases from +2 to 0.

(D) NaOH + HCl → NaCl + H₂O

This is a double displacement reaction. It is not a redox reaction because the elements have the same oxidation numbers on both sides.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong