Question

9. Human development published by UNDP compares countries based on a) Educational level c) National income b) Health status d) Both (a) & (b)​

Answer 1

Explanation:

Phenolphthalein is naturally colourless and works differently then litmus paper. Also, it turns in pink colour in an alkaline solution or base. Moreover, the compound remains colourless in acids but starts to turn pink on pH 8.2 and continues to turn bright purple in strong bases.