Science MCQ (1 Marks)

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are

Which of the following is an acid-base indicator?

Which of the following sets of substances contains acids only?

Anu re-visited a historical monument after 10 years. She noticed that the white monument had turned yellowish.
Which event is most likely to have caused the change in colour of the monument?

A scientist tests a soil sample from a uncultivated field and concludes that the soil is highly basic in nature. She suggests that adding organic matter in the soil could improve the quality of the soil. How does organic matter improve the quality of the soil?

A student is sting by an ant while playing. An elderly person suggests rubbing moist baking soda in the region to get quick relief. What does moist soda do to the sting of an ant?

Which of these activities represents a neutralisation reaction in everyday life?

A student took a half-filled test tube with dilute hydrochloric acid and a few drops of phenolphthalein in the solution. As he put a few drops of sodium hydroxide into the solution, it turns to light pink. Further, he put a few extra drops of acid and observe that the colour disappears. What caused the colour to disappear from the solution?

Which of the following mixtures represents a neutralisation reaction?

A student has four solutions among which one is acidic in nature. She wants to identify the acidic solution using a litmus paper. Which of these observations would help to identify the acidic solution?

A student understands that litmus solution has purple colour in distilled water. What colour is likely to be observed when it is placed in an acidic solution?

Which of the following substances is basic in nature?

When the soil is too basic, plants do not grow well in it. To improve its quality, what must be added to the soil?

On adding phenolphthalein indicator to a colourless solution no change is observed. What is the nature of this solution?

Neutralisation reaction is a

Products of a neutralisation reaction are always

A solution changes the colour of turmeric indicator from yellow to red. The solution is

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?

Litmus', a natural dye is an extract of which of the following?

The correct way of making a solution of acid in water is to

Phenolphthalein is used as an indicator

The solutions which do not change the colour of the litmus paper are called as __________.

Tartaric acid is found in __________.

Turmeric indicator in acidic solution gives

Calcium hydroxide is also known as __________.