The correct statements are:
Hardness is a physical property.
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.
Answer:
c.
Explanation:
co(so4)4
1 x 10⁻³.
∵ pH = - log[H⁺]
3 = - log[H⁺].
log[H⁺] = -3.
∴ [H⁺] = 1 x 10⁻³.
58.316 is the formula weight of magnesium hydroxide
