A cylinder with height and radius `2:1` is filled with soft drink and then it is tilted so as to allow some soft drink to flow off to an extent where the level of soft drink just touches the lowest point of the upper mouth. If `2.1` L of soft drink is retained in the cylinder, what is the capacity of the cylinder ?

The pH of a soft drink is 2.42. What is the hydronium ion concentration in the drink?

The pH values of two soft drinks P and Q are 6.4 and 8.2 respectively. If P is acidic, what is the pH value of the alkaline drink?

Figure 8.2 shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?