9th Chemistry Chapter 1 04/19/2024 – by freshmcqs 0 Welcome to your 9th Chemistry Chapter 1 Name Email WhatsApp Number 1. Industrial chemistry deals with the manufacturing of compounds: in the laboratory on micro scale on commercial scale on economic scale None 2. Which one of the following compounds can be separated by physical means? mixture element compound radical None 3. The most abundant element occurring in the oceans is: oxygen hydrogen nitrogen silicon None 4. Which one of the following elements is found in most abundance in the Earth's crust? oxygen aluminium silicon iron None 5. The third abundant gas found in the Earth's atmosphere is: carbon monoxide oxygen nitrogen argon None 6. One amu (atomic mass unit) is equivalent to: 1.66 x 10⁻²⁴ mg 1.66 x 10⁻²⁴ g 1.66 x 10⁻²⁴ kg 1.66 x 10⁻²⁴ g None 7. Which one of the following molecule is not tri-atomic? H₂ H₃ H₂O CO₂ None 8. The mass of one molecule of water is: 18 amu 18 g 18 mg 18 kg None 9. The molar mass of H₂SO₄ is: 98 g 98 amu 9.8 g 9.8 amu None 10. Which one of the following is a molecular mass of O₂ in amu? 53.12 x 10⁻²⁴ amu 1.92 x 10⁻²⁵ amu 32 amu 192.64 x 10⁻²⁵ amu None 11. How many number of moles are equivalent to 8 grams of CO₂? 0.15 0.18 0.21 0.24 None 12. Which one of the following pairs has the same number of ions? 1 mole of NaCI and 1 mole of MgCI₂ 1/2 mole of NaCI and 1/2 mole of MgCI₂ 1/2 mole of NaCI and 1/3 mole of MgCI₂ 1/3 mole of NaCI and 1/2 mole of MgCI₂ None 13. Which one of the following pairs has the same mass? 1 mole of CO and 1 mole of CO₂ 1 mole of O₂ and 1 mole of N₂ 1 mole of O₂ and 1 mole of CO₂ 1 mole of CO and 1 mole of N₂ None Please fill in the comment box below.