Who discovered hydrogen gas?

Write the electron-dot structure for sodium and chlorine atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have a high melting point?

Which among the following statements is incorrect for magnesium metal?

Which of the following properties is generally not shown by metals?

Name two metals which are purified by electrolytic refining. Mention the anode,cathode and the electrolyte used in the refining process. At which electrode would the pure metal be deposited?

The composition of aqua-regia is