What is the primary constituent of sand?

What product(s) is/are formed when aluminum metal is treated with concentrated nitric acid?

Which of the following compounds react with water to give phosphine?

Which of the following is true about interhalogen compounds?

Which oxide of nitrogen is released from car engines?

Before subjecting Mg ribbons to flame, it is rubbed with sandpaper. Why?

Which of the following is not a mineral of fluorine?

Which of the following scientists first discovered helium in the solar spectrum during a total solar eclipse?