1 of 20 〉 Which of the following are the most and the least electronegative elements in the periodic table?

• Chlorine and Fluorine
• Hydrogen and Helium
• Carbon and Oxygen
• Fluorine and Caesium

Answer: Chlorine and Fluorine

2 of 20 〉 Which compound of mercury is used as antiseptic?

• Mercuric sulphide
• Mercuric oxide
• Mercuric iodide
• Mercuric chloride

Answer: Mercuric chloride