Question

a metal which reacts with cold water displacing hydrogena metal which reacts with cold water displacing hydrogen

Answer 1

Calcium displaces hydrogen from cold water and forms calcium hydroxide.

Ca + 2H2O ------>Ca(OH)2 + H2.



Feel free to message me if you have any doubts.

May the new year be prosperous and glorious for you.

Please mark my answer as brainliest.

- Maheshwaran.

Answer 2

a: bleaching powder is calicum oxychloride the chemical formula of bleaching powder is CaCl2. when bleaching powder reacts with dilute HCL to luberate Cl2 gas water. CaOCl2 +2HCL -> CaCl2 +Cl2 +H2O


b: when baking soda is treated with dil. HCL it forms sodium chloride +water and carbondioxide gad os evolved.

Na2Co3 +2HCL-> 2NaCl +H2O + Co2 [up arrow mark keep].