Question

S →SO2 →CaSO3 →SO2 →Na2SO3

Answer 1

1)S+ O2→ SO2
2) SO2 + CaOH2→CaSO3 + H2O
3) CaSO3 + 2HCl→ CaCl2 + SO2 + H2O
4) SO2 + Na2O→ Na2SO3

Answer 2

The given sequence is:

S → SO2 → CaSO3 → SO2 → Na2SO3

Let's break down each step:

1. S: This represents sulfur, an element in its elemental form.

2. SO2: Sulfur dioxide is formed when sulfur (S) combines with oxygen (O2). It is a gas composed of one sulfur atom and two oxygen atoms.

3. CaSO3: Calcium sulfite is formed when sulfur dioxide (SO2) reacts with calcium oxide (CaO). It is an inorganic compound composed of one calcium atom, one sulfur atom, and three oxygen atoms.

4. SO2: Sulfur dioxide (SO2) is released again, possibly indicating a process that involves the release of SO2 gas.

5. Na2SO3: Sodium sulfite is formed when sulfur dioxide (SO2) reacts with sodium hydroxide (NaOH). It is an inorganic compound composed of two sodium atoms, one sulfur atom, and three oxygen atoms.

Overall, the given sequence represents a series of reactions involving sulfur (S), sulfur dioxide (SO2), calcium sulfite (CaSO3), and sodium sulfite (Na2SO3).