Which of the following pair of compound name – formula is correct?

I. Calcium oxide – Ca2O

II. Aluminum Oxide – Al2O3

This question was previously asked in
SSC CPO 2022 Tier-I Official Paper (Held On : 9 Nov 2022 Shift 3) [Answer Key]
View all SSC CPO Papers >
  1. Only I
  2. Both I and II
  3. Neither I nor II
  4. Only II

Answer (Detailed Solution Below)

Option 4 : Only II
Free
SSC CPO : General Intelligence & Reasoning Sectional Test 1
13.3 K Users
50 Questions 50 Marks 35 Mins

Detailed Solution

Download Solution PDF

The correct answer is Only II.

Key Points

  • Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound.
    • It is a white, caustic, alkaline, crystalline solid at room temperature.
    • Formula: CaO
    • IUPAC ID: Oxocalcium
    • Molar mass: 56.0774 g/mol
    • Melting point: 2,572 °C
    • Density: 3.34 g/cm³​
    • Soluble in: Water, Glycerol.

Thus I is incorrect.

  • Aluminium oxide is a white odourless crystalline powder. It is water-insoluble.
    •  Aluminium oxide has a chemical formula of Al2O3.
    • It is amphoteric in nature and is used in various chemical, industrial and commercial applications.
    • An oxide of aluminium occurs in nature as various minerals such as bauxite, corundum, etc.
    • It is used as an adsorbent, desiccating agent, and catalyst, and in the manufacture of dental cement and refractories.

Thus II is correct.

Latest SSC CPO Updates

Last updated on Jun 17, 2025

-> The SSC has now postponed the SSC CPO Recruitment 2025 on 16th June 2025. As per the notice, the detailed notification will be released in due course.  

-> The Application Dates will be rescheduled in the notification. 

-> The selection process for SSC CPO includes a Tier 1, Physical Standard Test (PST)/ Physical Endurance Test (PET), Tier 2, and Medical Test.

-> The salary of the candidates who will get successful selection for the CPO post will be from ₹35,400 to ₹112,400.     

-> Prepare well for the exam by solving SSC CPO Previous Year Papers. Also, attempt the SSC CPO Mock Tests

-> Attempt SSC CPO Free English Mock Tests Here!

Get Free Access Now
Hot Links: teen patti list teen patti party teen patti master online lotus teen patti