Which one of the following statements is not correct?

Which of the following salts form hydrates? $CaCl_2$ $(I)$,$NaCl$ $(II)$,$LiCl$ $(III)$,$BaCl_2$ $(IV)$,$KCl$ $(V)$

Which of the following compounds release oxygen upon heating?

Which alkali metal is most metallic in character?

One of the by-products formed during the recovery of $NH_{3}$ from the Solvay process is ..... .

When a metal of group $1$ was dissolved in liquid ammonia,the following observations were obtained :
$(a)$ Blue solution was obtained initially.
$(b)$ On concentrating the solution,the blue colour changed to bronze colour.
How do you account for the blue colour of the solution? Give the name of the product formed on keeping the solution for some time.