1000 Questions Group I/II

Question 1

For the elements in Group I and II state which atom:

i) has the largest ionic radius

ii)the lowest value for Ionisation Energy

iii) the least soluble hydroxide

iv) the least soluble sulfate

v) the lowest electronegativity

Question 2

Describe the arrangement of ions in solid NaCl and in solid CsCl. Explain why the arrangements are different.

Question 3

When hydrated MgCl₂.6H₂O is heated it yields a basic chloride [Mg{OH)Cl] whereas when a BaCl₂.2H₂O is heated it yields anhydrous BaCl₂. Explain.

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Strontium occurs in the form of four isotopes: 0.6% of relative mass 83.94, 9.9% of relative mass 85.94%, 7% of relative mass 86.94 and 82.5% of relative mass 87.93. Calculate the atomic mass of strontium.

Question 10

0.257g of impure Na₂O₂ was dissolved in water and its volume was made up to 250cm³. 50cm³ of this solution required exactly 8.07cm³ of 0.02M KMnO₄. Calculate the percentage purity of the peroxide.