- Universal indicator is a blend of multiple indicators. - It provides a spectrum of colours corresponding to different pH levels. - It is useful for estimating the pH of a solution but less so for precise titration endpoints.
Which of the following statements about universal indicator is/are true ? 1. It is a mixture of several indicators. 2. It shows different colours at different concentrations of hydrogen ions in solution. 3. It helps to determine the strength of given acid and base in titration. Select the correct answer using the code given below :
Asked in UPSC CDS 2 2021 · Topic: Acid, Base and Salt (Acid-Base Indicators (Litmus, Phenolphthalein, Methyl Orange, Universal Indicator))
More Chemistry questions
- What is the color of Litmus solution when it is neither acidic nor basic ?
- A stain of curry on a white cloth becomes reddish brown when soap is scrubbed on it. It turns yellow again when the cloth is washed with plenty of water. It had turned reddish brown because :
- Fill in the blank appropriately. A trap laid for apprehending a Govt. employee taking bribe used phenophthalein powder coated currency notes. A solution of sodium carbonate sprinkled on the notes must turn _______ for lending proof for the crime.
- Suppose you have four test tubes labelled as 'A', 'B', 'C' and 'D'. 'A' contains plain water, 'B' contains solution of an alkali, 'C' contains solution of an acid, and 'D' contains solution of sodium chloride. Which one of these solutions will turn phenolphthalein solution pink ?
- Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water ?
- A suitable indicator used for titration between strong acid and weak base is -
- Some metal oxides react with acid as well as base to produce salt and water. They are known as amphoteric oxides. The examples of amphoteric oxides are
- Which one of the following oxides shows both acidic and basic behaviour?