The charge in coulombs of 1 gram ion of N^3- is (the charge on an electron is 1.602 × 10 ^-19 C)
(A) 2.894 × 10 ^5 C (B) 3.894 × 10 ^5 C (C) 2.894× 10^6 C (D) none of these

Answer is option A
= 2.894×10^5C

Explanation :

Charge on one ion of N3- = 3 × 1.6 × 10^-19 coulomb

Thus, charge on one g-ion of N3-
= 3 × 1.6 ×10^-19 × 6.02 × 10^23

= 2.89 × 10^5 coulomb