If the value of $K_b$ is $10^{-5}$,find the $K_h$ value for a salt of (strong acid - weak base) at $363 \ K \ (90 \ ^\circ C)$. [At $90 \ ^\circ C, K_w = 10^{-12}$]

• A
  $10^{-5}$
• B
  $10^{-4}$
• C
  $10^{-2}$
• D
  $10^{-7}$