Answer:
c.I ,II & IV are correct
Explanation:
Phenolphthalein is an indicator. An indicator is an organic dye whose solution changes colour as the concentration of hydrogen ions in solution changes.
Hence a typical indicator exhibits different colours at different pH ranges. The colour of an indicator in an acid, a base and at end point always differs.
Phenolphthalein is a colourless solution which has a pink colour in an alkaline medium and colourless in an acidic medium.
Number 2. This is a power plant windmill. Kinetic energy from the wind is being converted to mechanical energy.
Number 3. Those are energy power plants which involve coal being burned. Chemical energy is being converted to heat energy and then into kinetic energy.
Number 3. You're welcomed to use whatever object you'd like. An example you could put is a car. Chemical energy is being converted to mechanical energy.
Hope that helps. -UF aka Nadia
They turn blue litmus paper to red.
They also taste sour.
A2-34=56 this is the equation to your expression