Any substance which is able to produce ion, acts as a good conductor of electricity. Both base and acid dissociate in water and produce OH- and H+ respectively which act as carrier of charge. Thus option D is correct.
Both acid and alcohol forms the part of soap and thus option B is also correct
However, Litmus turns from blue to red in acidic solution only, thus option A is incorrect. Also, only acid donates proton , hence option C is incorrect.
Both acids and bases produce ions in solution, are electrolytes, and conduct electricity in solution. Although red litmus is an indicator, it does not change color in an acid, acids are proton donors while bases are proton acceptors. Soaps often contain bases, not acids.
D) conduct electricity in water. is the correct answer
Examples of Fluid Technology include: Hydraulics- which exist in cars, planes, robots, etc. Other examples include: Fire Extinguishers, Steam Engines, Water Turbines, etc.
When using a microscope, generally magnification is higher and a ruler will not work unless you are using a very low power stereo microscope. When using a compound high power microscope an eyepiece reticle is used to make measurements.
