Acids Bases and...

A student was provided a few samples of edible substances for tasting and asked to record the tastes. Which of the following samples would have tasted bitter?

A student was mixing an acid and a base in the laboratory. He observed that the test tube became hot after mixing. What was the reason for this increase in temperature?

In the table given below, match the bases in the first column with their applications mentioned in the second column.

Match the following indicators with their colour in a soap solution:

Why is calamine solution rubbed over an area of ant bite?

A student has dipped blue litmus paper into a beaker containing a liquid. Its colour turned red. Which of the following is responsible for this change?

Match acids given in the first column with their natural sources listed in the second column:

A person was asked to identify a liquid by tasting it without using an indicator. The person labelled it as a base. What taste would the person  have perceived to label it as a base?

When litmus paper is dipped into water, there is no change in colours of litmus paper. What can be inferred from this observation?

A few drops of a colourless indicator are added to test tubes labelled as 'A' and 'B', each containing some colourless solution. The colour of the solution in the test tube 'A' turns pink on addition of the indicator, but no colour change is observed in the test tube 'B'. Which of the following is the correct combination of indicator and the solutions in the test tubes 'A' and 'B', respectively?

Which among the following would be recommended to a person who is suffering from indigestion?

Indicators are used to determine the nature of a substance (acidic or basic). How do indicators determine the nature of substance?

Which of the following substances will turn red litmus solution into blue?

Why does a turmeric stain on a white cloth turn into red, when washed with soap?

Turmeric is used as a spice in the food and is known to have an excellent healing quality. For what purpose has Rahul taken it to his chemistry laboratory?