In which set does the colour change faster ? Why ?

In which medium does sound travel faster?

Why does the colour of the sky appear blue?

Consider the following statements: (a) Both acids and bases change colour of all indicators. (b) If an indicator gives a colour change with an acid, it does not give a change with a base. (c) If an indicator changes colour with a base, it does not change colour with an acid. (d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct?

Consider the following statements : Consider the following statements Both acids and bases change colour of all indicators If an indicator gives a colour change with an acid, it does not give a change with a base If an indicator changes colour with a base, it does not change colourwith an acid Change of colour in an acid and a base depends on the type of the indicator Which of these statements are correct?

Whose skin colour does not change