Which of the following compounds has the highest ionic character?

If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly

One mole of a compound M(HCO₃)₂ has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of