CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

With the reference to four gases CO2,CO, Cl2 and O2, which one of the options in the table is correct?


Acidic oxide

Used in treatment of water

Product of respiration

Product of incomplete combustion

(a) CO Cl 2 O 2  CO
(b) CO 2 Cl 2 CO 2  CO
(c) CO 2 O 2 O 2 CO 2
(d) CO O 2 CO 2 CO 2



  • Oxides that produce acids when added to water are Acidic Oxides .
    • Carbon Monoxide (CO) is a Neutral Oxide
    • Carbon Dioxide is an Acidic Oxide and produces Carbonic Acid ( H 2 CO 3 ) when added to water. 
  • Cl 2 is used in the treatment of water.
  • Respiration is a biological process that produces energy in an organism. It uses O 2 as a reactant and gives CO 2 as a product.
  • Incomplete combustion produces Carbon monoxide (CO) as a result.

Therefore, the correct answer is (b) CO 2 , Cl 2 , CO 2 , CO

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo