NaCl in water diagram and label the forces

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Which metal exist in liquid state and can be cut with knife ?