The value of \[ \lim_{x \to 0} \frac{1 - \cos(1 - \cos x)}{x^4} \] is:
Given \[ 2x - y + 2z = 2, \quad x - 2y + z = -4, \quad x + y + \lambda z = 4, \] then the value of \( \lambda \) such that the given system of equations has no solution is:
Match the species in Column I with their types in Column II.
0.20 g of an organic compound gave 0.12 g of AgBr. By using Carius method, the % of bromine in the compound will be: