A student prepared a sample of silicon chloride by passing chlorine over heated silicon and collecting the condensed silicon chloride in a small specimen tube. He analysed the chloride in a small specimen tube. He analysed the chloride by dissolving a known mass of it in water, and titrating the solution with standard silver nitrate solution. The formula of the silicon chloride as obtained by this method was `SiCl_(2.6)` as against a 'true' formula of `SiCl_(4)`.
Which of the following possible errors could have resulted in this wrong formula ?

Options

A. The excess silicon chloride obtained is dissolved in chlorine
B. The "standard" silver nitrate solution was less concentrated than was stated on the label
C. More silicon chloride than the student supposed was actually used owing to inaccurate weighing
D. The small specimen tube was not dry