Identify the following as combination, decomposition, replacement, or ion exchange reactions: znco3(s) → zno(s) + co2 ↑ 2 nabr(aq) + cl2(g) → 2 nacl(aq) + br2(g) 2 al(s) + 3 cl2(g) → 2 alcl3(s) ca(oh)2(aq) + h2so4(aq) → caso4(aq) + 2 h2o(l) pb(no3)2(aq) + h2s(g) → 2 hno3(aq) + pbs↓ c(s) + zno(s) → zn(s) + co↑

Explanation:

ZnCO₃(s) → ZnO(s) + CO₂ ↑

      Decomposition reaction:

This involves the breakdown of a compound into its component individual elements or other compounds.

2NaBr(aq) + Cl₂(g) → 2NaCl(aq) + Br₂(g)

        Replacement reaction

This is a single replacement reaction in which one substance replaces the other.

2Al(s) + 3Cl₂(g) → 2AlCl₃(s)

  Combination reaction:

Here, a single compound forms from two or more reacting species.

Ca(OH)₂(aq) + H₂SO₄(aq) → CaSO₄(aq) + 2H₂O(l)

Replacement reaction:

This is a double replacement reaction in which ions are exchanged to form new compounds.

Pb(NO₃)₂(aq) + H₂S(g) → 2HNO₃(aq) + PbS↓

Replacement reaction:

This is a double replacement reaction in which ions are exchanged to form new compounds.

C(s) + ZnO(s) → Zn(s) + CO↑

Replacement reaction

This is a single replacement reaction in which one substance replaces the other.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.