A metal X reacts with cold water to give a colourless gas and an alkaline solution. When the gas is ignited, it burns with a squeaky pop. Metal X is most likely

Only very reactive metals (Group I alkali metals like sodium and potassium) react vigorously with cold water to produce hydrogen gas and a metal hydroxide solution, which is alkaline. Hydrogen burns with a characteristic squeaky pop. Iron and zinc react with steam but not cold water, while copper does not react with water at all.