Question

a metal which sinks in water forming an alkali solution and does not catch fire​

Answer 1

Answer:

rubidium it is

Explanation:

rubidium it is

Answer 2

Answer:

all of group 1 element Li ,Na, K, Rb and Ce react vigorously or even explosively with cold water.

Explanation:

in each case the aq metal hydroxide and hydrogen gas are produced as show    

2X(s)+2H2O(l)===2XOH(aq)+H2(g)

Where X is any group 1 metal. in each of the following description , very small portion of the metal is dropped in to a large container of water.