Question:
The chemicals used in a foam type fire extinguisher are
The chemicals used in a foam type fire extinguisher are
Show Hint
Sodium bicarbonate (NaHCO$_3$) and aluminum sulfate (Al$_2$SO$_4$) are commonly used in foam-type fire extinguishers due to their foam-generating properties.
Updated On: Dec 3, 2025
- NaHCO$_3$ and Na$_2$SO$_4$
- Al$_2$(SO$_4$)$_3$ and Na$_2$SO$_4$
- Al$_2$(SO$_4$)$_3$ and Al(OH)$_3$
- NaHCO$_3$ and Al$_2$(SO$_4$)
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understand the chemical composition of foam-type fire extinguishers.
Foam fire extinguishers use a mixture of chemicals that react to form foam, which helps to suppress fires by isolating the fire from the oxygen supply.
Step 2: Identify the chemicals in foam extinguishers.
(D) NaHCO$_3$ (sodium bicarbonate) and Al$_2$SO$_4$ (aluminum sulfate) are the chemicals involved in foam generation for fire extinguishing purposes.
Was this answer helpful?
1
0
Top GATE MN Surface Environment Questions
The figure below shows four profiles of the environmental lapse rate. Given that the dry adiabatic lapse rate is \( -10^\circ {C/km} \), the atmosphere is highly unstable for the profile:
- Average noise level at a working place is 80 dB(A) for the first 10 minutes and 60 dB(A) for the next 30 minutes. The energy equivalent continuous noise level at the place for the entire period of 40 minutes, in dB(A), is:
- SO$_2$ is emitted at a rate of 20 kg/s from a 10 km $\times$ 10 km airshed in an industrial area. Wind blows at a speed of 4 m/s from one direction in that area. Radiation inversion restricts the mixing height to 1200 m. Neglect SO$_2$ concentration in the incoming air. Assuming emitted SO$_2$ to be conservative, the steady state SO$_2$ concentration in the airshed, in $\mu g/m^3$, is _______ (rounded off to 2 decimal places).
- A wastewater sample has an ultimate BOD of 300 mg/L. BOD reaction rate constant is 0.22 per day at 20 ℃. If the temperature coefficient is 1.05, the 5-day BOD at 25 ℃, in mg/L, is:
- The bottom section of a stoping block has dimensions 200 m $\times$ 40 m. If the modified RMR of the rock mass is 50, the appropriate method of mining on the basis of Laubscher’s chart in the figure is:
View More Questions
Top GATE MN Fire Safety Questions
Top GATE MN Questions
- Exposure to loud impulsive noise may lead to
- In a self-contained closed-circuit breathing apparatus,
- A rectangular mine airway of 2.0 m width and 2.5 m height has a bend with deflection of π/4 radian. If the radius of curvature of the bend is 4.0 m, the shock factor of the bend is (round off to three decimals)
- In an underground coal mine, two fatalities and three serious bodily injuries occurred during the year 2022. The average daily employment is 1100 and annual working days is 300. The severity index as per DGMS guideline for the mine is
- For a geared engine winding system, the man winding cage is placed at its normal position at pit top of the shaft. As per CMR 2017, the minimum space, in m, between the center of the hole of the detaching hook attached to the rope shackle and detaching belt plate is
View More Questions