497.75 ÷ 24 ×4.99 = ?
105
100
95
110
115
497.75 ÷ 24 ×4.99 = 103.5 ≈ 105
What is the maximum pH of a 0.1M Mg2+, the solution from which Mg (OH)2 will not be precipitated?
[Ksp=1.2×10−11]
The threshold frequency ν0 for a metal is 7.0 × 1014 s−1. Calculate the kinetic energy of an electron emitted when radiation of frequency ν = 1.0 × 1015 s−1