Chemistry - Complete Pblock- Question with Solution | TestHub

Gas (X) is Carbon Monoxide (CO), which validates all the statements provided in the options:

Option (A) is correct because CO gas is quantitatively estimated via its reaction with iodine pentoxide (I₂O₅).

Option(B) is correct because ammoniacal or hydrochloric solutions of cuprous chloride (Cu₂Cl₂) readily absorb CO gas.

Option (C) is correct because CO acts as a purifying agent for Nickel (Ni) in Mond's process by forming volatile nickel tetracarbonyl [Ni(CO)₄].

Therefore, the correct answer option is (D) All of these.