Same chapter3 marksDifficulty: Medium
Explain the formation of a molecule of methane, naming the type of bond.
Atomic Structure and Chemical Bonding
3 marksDifficulty: Medium
An element has two isotopes of mass numbers 35 and 37 present in the ratio 3 : 1. Calculate its average atomic mass.
Original Khojo Papers practice question — not from a past board paper.
Answer
35.5
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The average is (3 × 35 + 1 × 37) ÷ 4 = 142 ÷ 4 = 35.5. This is chlorine.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Explain the formation of a molecule of sodium chloride, naming the type of bond formed.
Atomic Structure and Chemical Bonding
Same chapter3 marksDifficulty: Medium
What is the octet rule, and which family of elements already obeys it?
Atomic Structure and Chemical Bonding
Same chapter3 marksDifficulty: Medium
An atom has an atomic number of 17 and a mass number of 35. Write its electronic configuration and state the number of neutrons.
Atomic Structure and Chemical Bonding
Same chapter3 marksDifficulty: Medium
What are isotopes? Give one example and state why they have the same chemical properties.
Atomic Structure and Chemical Bonding
Same chapter3 marksDifficulty: Medium
Why do noble gases not usually take part in chemical reactions?
Atomic Structure and Chemical Bonding