(a)i.  Define an acid according to the Lewis concept

ii. Give one example of a Lewis acid

(b) Explain salting out in soap preparation

(c) State the reagent and condition necessary for the following conversion
H−C≡C−H→Ag−C≡C−Ag

(d) What is the percentage abundance of an isotope?

(e)i. Why does the element with atomic number 18 not have an oxide?

ii. Explain why chlorine(I) oxide has a low melting point

(f). Describe a test to distinguish between concentrated HNO3 and concentrated H2SO4

(g) State two differences between an electrochemical cell and an electrolytic cell

(h) How does the trend in ionization energy affect the reactivity of group 1 elements?

(i).Define the term molecular formula

(j) State which of the gases H2 and NH3 would deviate more from ideal behaviour. Give reasons for the answer stated above