Are group2 HYDROXIDES soluble or not ?

Generally speaking, it is not a good idea to consider compounds as either "soluble or not"; in reality, many substances that are commonly thought of as "Insoluble in water" are actually soluble to some extent. Magnesium hydroxide, for instance, is commonly thought of as being insoluble (it is used to form the suspension known as "milk of magnesia"), but at 25 degrees Celsius, it dissolves in water at a rate of about 0.0007 g per 100 ml.

The conclusion is that group 2 hydroxides—potassium hydroxide, 121 g/100 ml at 25 degrees C; and magnesium hydroxide, 0.0007 g/100 ml at 25 degrees C—are all very slightly soluble in water, but significantly less so than group 1 hydroxides.

Group 2 hydroxides, such as magnesium hydroxide, calcium hydroxide, and barium hydroxide, are generally considered insoluble in water. However, they do undergo some degree of hydrolysis, resulting in the formation of a weakly basic solution.