Why is a green flame not obtained in the case of barium sulphate or barium phosphate ?

Why is a green flame not obtained in the case of barium sulphate or phosphate?

The formula of barium sulphate is

If $0.7$ moles of Barium Chlorine is treated with 0.4 mole of potassium sulphate, number of moles of barium sulphate formed are

If 0.7 moles of Barium Chloride is treated with 0.4 mole of potassium sulphate, number of moles of barium sulphate formed are

Magnesium oxide is $MgO$, magnesium hydroxide is $M{g\left(OH\right)}_2$ and magnesium sulphate is $MgS{O}_4$ What would be the formulae of barium oxide, barium hydroxide and barium sulphate if barium belongs to the same group, as magnesium ?

Assertion: Reaction between barium chloride and sodium sulphate is a double displacement and precipitation reaction.
Reason: Reaction between barium chloride and sodium sulphate involves the exchange of ions between the reactants and a white precipitate of barium sulphate is formed.

The sulphur dioxide obtained by the combustion of 8 gms of sulphur is passed into Bromine water. The solution is then treated with barium chloride solution. The amount of barium sulphate formed is

Solubility product $\left(K_{sp}\right)$ of $BaS{O}_4$ is $1.1\times {10}^{-10}$. What will be the molar solubility of barium sulphate in 0.05 m barium chloride solution?

0.6 mol of barium chloride in solution is mixed with 0.2 mol of sodium phosphate, the amount of barium phosphate produced is:

Write the balanced chemical equations for the following reactions :
Barium chloride + Potassium sulphate $\to$ Barium sulphate + Potassium chloride