Identify the acid(A), base(B), conjugate acid(CA) and conjugate (B) in the reaction between carbonic acid and sodium hydroxide.

Acid : H₂CO₃

Base :  OH⁻

Conjugate Base(CB) : CO₃²

Conjugate Acid(CA) : H₂O

Further explanation

According to Bronstead-Lowry

Acid = proton donor (H +)

Base = proton acceptor (H +)

The conjugate base is the acid that has given the proton

A conjugate acid is a base that has accepted a proton

The conjugate acid ⇄ base + H +

Base + H + ⇄ Conjugate acid

Bronstead-Lowry  reaction for acid-base :

HA(acid) + B⁻(base) ⇒ A⁻(CB) + HB(CA)

Reaction

H₂CO₃ + NaOH ⇒ Na₂CO₃ + H₂O

H₂CO₃(acid) + OH⁻(base) ⇒ CO₃²⁻(CB) + H₂O(CA)

Aconductor easily transfer heat

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na