F3 Chem Ch7-01

Which of the following ions is colourless in its aqueous solution?

• Cu²⁺

• Cr³⁺

• Cr₂O₇^2-

• Cs⁺

Which of the following substances is a conductor of electricity?

• solid carbon dioxide
• solid sodium chloride
• solid magnesium
• solid potassium carbonate

Which of the following substances is an electrolyte?

• ethanoic acid
• diamond
• sand
• calcium

Which of the following substances are joined together by ionic bonds?

• silver
• aluminium carbonate
• carbon tetrachloride
• bromine

Which of the following species have the same electronic arrangement as an neon atom?

(1) F^-

(2) Mg²⁺

(3) S^2-

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following species have the same electronic arrangement as an argon atom?

(1) K⁺

(2) Al³⁺

(3) Cl^-

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following ions are green in its aqueous solution?

(1) Cu²⁺

(2) Fe²⁺

(3) Cr³⁺

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Element X has an atomic number 20. What is the charge of its ion?

• 2-
• 1-
• 1+
• 2+

Which of the following pairs has the same electronic arrangement?

• Na⁺ and K⁺

• Cl^- and Br^-

• S^2- and Cl^-

• K⁺ and Br^-

An atom X of a solid element forms a X^3- ion. What is the atomic number of X?

• 13

• 15

• 17

• 19