Calcium salts give which colour when put in a flame?

Which of the following is true regarding alkaline earth metals?

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$ :
Assertion $(A)$ : $BeCl_2$ and $MgCl_2$ produce characteristic flame.
Reason $(R)$ : The excitation energy is high in $BeCl_2$ and $MgCl_2$.
In the light of the above statements,choose the correct answer from the option given below :

Which compound produces a paramagnetic acidic gas upon heating?

All of the following substances react with water. Which of the following pairs will produce the same gaseous product upon reaction with water?

In which of the following exothermic reactions,the heat liberated per mole is the highest?