Q123 Use the appropriate verb forms mentioned in the brackets.
1. Have all the rules____ (not explain) to you by the examiner. (present perfect)
2. Are the children____(pluck) the flowers? (present continuous)
3. These awards____(sponsor) by our company. (present perfect)
4. These cheques____(not sign) by the manager. (present perfect)
Q129 The molecular formula of a compound is CH₂OH. Calculate its molecular mass in atomic mass units. Also, write down its molar mass. (atomic masses are: H = 1u, C = 12u, 0 = 16u)