Fire extinguishers emit which gas?
Carbon dioxide
Carbon dioxide (CO2) is the gas emitted by common gas-based fire extinguishers. Being denser than air and non-combustible, it blankets the fire, displaces oxygen and smothers the flames, while its rapid expansion produces a cooling effect. Because it leaves no residue and does not conduct electricity, it is preferred for Class B (flammable liquids) and Class C (electrical) fires.
Carbon monoxide is itself flammable and toxic; chlorine is toxic and reactive; nitrogen is occasionally used as a propellant but not as the primary extinguishing agent.
In the following reaction, fill in the blank.
Acid + Base → _______ + Water
Which of the following is a characteristic of an exothermic reaction?
Ozone is an ______ of oxygen.
What is the common characteristic of the elements of the same group in the periodic table?
Which amongst the following is not a cation?
Which of the following bonds are weakest in nature?
What is the chemical name of saltpetre?
The reaction of Copper Sulphate and Iron produces Iron Sulphate and __________.
What is the bond angle (in degrees) in the structure of a benzene molecule?
Which of the following statement(s) is/are CORRECT?
I. Carbon compounds linked by only single bond are called saturated compounds.
II. Carbon compounds having double or triple bonds are called unsaturated compounds.
III. Saturated carbon compounds are more reactive than unsaturated carbon compounds.