\(Cu\) and \(HNO_{3}\) are not suitable for preparing hydrogen gas because of their
Which of the following CANNOT be an empirical formula?
One of the criteria for confirming the purity of benzene is to determine its
When chlorine is passed through a sample of water, the pH of the water sample would be
How many atoms are contained in 0.2moles of nitrogen? \([N_{A} = 6.02 \times 10^{23}]\)
