A) One B) Zero C) Two D) Three Answer: A Explanation: Nitrogen supplies five valence electrons. Three bonds leave one […]

How many lone pairs are on the central oxygen in H₂O?

A) Zero B) Two C) One D) Three Answer: B Explanation: Oxygen contributes six valence electrons. After forming two O–H […]

How many pi bonds are present in a carbon-carbon double bond?

A) Zero B) One C) Two D) Three Answer: B Explanation: A double bond comprises one sigma and one pi […]

A) Energy of a light photon only B) The number of covalent C–H bonds C) The solution's pH D) Energy […]

A) A bond made only by passing neutrons B) A bond formed by sharing electron density between atoms C) A […]

A) Sharing an equal pair of neutrons B) A gas pressure change C) Electrostatic attraction between oppositely charged ions D) […]

A) One B) Two C) Three D) Four Answer: C Explanation: The Lewis structure of nitrogen has a triple bond. […]

A) Zero B) Two C) One D) Three Answer: C Explanation: A triple bond contains one sigma bond. Its remaining […]

A) Ca₂O B) CaO₂ C) CaO D) Ca₂O₃ Answer: C Explanation: Calcium generally forms Ca²⁺ and oxygen O²⁻. A one-to-one […]

A) MgCl B) MgCl₂ C) Mg₂Cl D) Mg₂Cl₃ Answer: B Explanation: Magnesium commonly forms a 2+ ion. Two chloride ions […]