Which of the following can be used to extinguish a fire caused by sodium,potassium,and lithium?

Which of the following metals displaces $SO_2$ gas from concentrated sulphuric acid?

The correct statement$(s)$ among $I$ to $III$ with respect to potassium ions that are abundant within the cell fluids is/are :
$I.$ They activate many enzymes
$II.$ They participate in the oxidation of glucose to produce $ATP$
$III.$ Along with sodium ions,they are responsible for the transmission of nerve signals

Match the following:

Metals	Flame color
$1$. $Li$	$a$. Crimson red
$2$. $K$	$b$. Violet
$3$. $Rb$	$c$. Red-violet
$4$. $Cs$	$d$. Blue

How does the ionization energy of the elements of Group $1$ change as we move down the group?

From the following,which group of elements easily forms a cation?