70th B.P.S.C. Pre-2024
Which of the following are the constituents of a soda-acid fire extinguisher ?
aConc. sulphuric acid and aluminium sulphate
bDil. sulphuric acid and sodium carbonate
cDil. sulphuric acid and sodium bicarbonate solution✓ Correct
dConc. sulphuric acid and sodium carbonate solution
Explanation
In a soda-acid fire extinguisher, the main components are dilute sulfuric acid and sodium bicarbonate (baking soda) solution. It is used as a domestic fire extinguisher. The chemical name of blue vitriol is copper sulfate. Its formula is CuSO4·5H2O. This salt is a white crystal in the anhydrous state, but the hydrated salt is blue in color. Blue vitriol dissolves easily in water, but is insoluble in alcohol.
general-science