A visually challenged student, has to perform a lab test to detect the presence of acid in a given solution. The acid-base indicator preferred by him will be :(a) Blue litmus (b) Clove oil(c) Red cabbage extract (d) Hibiscus extract
Correct Answer: (b) Clove oil
Explanation: Olfactory indicators may be used as the presence of acid can be detected through smell. Hence, it can be used by a visually challenged student.
Example: Clove oil loses its smell in basic solution and retains it in acidic solution.
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- Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?(a) Yellow in both acid and base(b) Yellow in acid and red in base(c) Pink in acid and yellow in base(d) Red in acid and blue in base
- Which one of the following can be used as an acid-base indicator by a visually impaired student?LitmusTurmericVanilla essence Petunia leaves
- Which one of the following solutions would you use to test the pH of a given sample?(1)blue litmus solution(2)red litmus solution(3) universal indicator solution(4)mixture of red and blue litmus solution
- What do we observe on pouring acetic acid on red and blue litmus papers?(A) Red litmus remains red and blue litmus turns red.(B) Red litmus turns blue and blue litmus remains blue.(C) Red litmus turns blue and blue litmus turns red.(D) Red litmus becomes colourless and blue litmus remains blue.
- What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?(a) Methyl orange (b) Litmus (c) Red cabbage extract
- When a solution is added to vanilla extract, then the characteristic smell of vanilla cannot be detected. State whether the given solution is an acid or a base.
- How is the presence of an acid tested with a strip of red litmus paper?
- A solution turns red litmus blue. Its pH is likely to be:(a) 1 (b) 4 (c) 5 (d) 10
- A solution turns blue litmus red. Its pH is likely to be:(a) 7 (b) 5 (c) 8 (d) 14
- Name an indicator which is red in acid solution but turns blue in basic solution.
- Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.(a) What will be the action of solution A on litmus? (b) What will be action of solution B on litmus? (c) Name any two substances which can give solutions like A. (d) Name any two substances which can give solutions like B. (e) What sort of reaction takes place when solution A reacts with solution B?
- A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is :(1) A (2) B (3) C (4) D
- Answer the following questions:1: Special type of substances used to test whether a substance is acidic/basic is known as (A) Indicators (B) Acids (C) Bases (D) Salt2: Which of the following is a strong acid? (A) Acetic Acid (B) Nitric Acid (C) Lactic Acid (D) Citric Acid3: The most commonly used natural indicator' Litmus is extracted from (A) Lichens (B) Turmeric (C) Beet Root (D) China Rose4: Which of the following colours is given by phenolphthalein in a basic salt solution. (A) Yellow (B) Pink (C) Orange Red (D) Colourless"
- True or False:Nitric acid turns red litmus blue
- When a solution is added to a cloth strip treated with onion extract, then the smell of onion cannot be detected. State whether the given solution contains an acid or base.
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