4.
when 31.6 g mnxoy is heated with carbon then 13.2 g of co2 gas is produced then the formula
of mnxoyis
(a) mno
(b) mno2
(c) mn2o3
(d) mn2o5

What is the relative mass of an electron? a) 1/1840 the mass of a neutron + proton b) 1/1840 the mass of an alpha particle c) 1/1840 the mass of a c-12 atom d) 1/1840 the mass of a hydrogen atom

Which of the following volumes is the smallest? a) one microliter b)one deciliter d)one liter c)one milliliter

Comparing john newland’s octaves with the modern periodic table, which 5 elements have been discovered between hydrogen and iron since newland’s time?