Chemistry
These questions are based upon the periodic properties of the elements. Answer the following questions in one or two lines.
(a) Element that has completely filled two shells.
(b) Element that has electronic configuration 2, 8, 2.
(c) Element that has total of three shells with four electrons in its valence shell.
Related Questions
Distinguish between the following as directed.
(a) Calcium nitrate and lead nitrate using NaOH.
(b) Ferrous chloride and ferric chloride using NH4OH.
Name the ions present in
(a) hydrogen chloride
(b) lead sulphate
(c) ammonium hydroxide
Identify the salts X and Y from the following observations.
(a) Salt X is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas. Solution of salt X produces chalky white insoluble precipitate with excess of ammonium hydroxide.
(b) Salt Y is black in colour. On reacting with conc. HCl, it liberates a pungent greenish yellowish gas which turns moist starch iodide paper blue black.
Write the products and balance the equation.
(a) Na2CO3 + H2SO4 ⟶
(b) Fe + H2SO4 ⟶