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प्रश्न
The indicators which turn red in acid solution are:
(a) turmeric and litmus
(b) phenolphthalein and methyl orange
(c) litmus and methyl orange
(d) phenolphthalein and litmus
उत्तर
litmus and methyl orange
Litmus and methyl orange turn red in an acid solution.
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संबंधित प्रश्न
What colours do the following indicators turn when added to an acid (such as hydrochloric acid)?
litmus
Fill in the blank in the following sentences:
Acids have a ..........................taste and they turn..........................litmus to..........................
Fill in the blank in the following sentences:
Those substances whose smell (or odour) changes in acidic or basic solution are called .......................... indicators.
What is the name of the indicator which can be used for testing the pH of a solution?
Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
Under what soil conditions do you think a farmer would treat the soil of his fields with quicklime (calcium oxide), or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
(i) Lemon juice
(ii) Solution of washing soda
(iii) Toothpaste
(iv) Vinegar
(v) Stomach juices
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
What will be the action of solution A on litmus?
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
Name any two substances which can give solutions like B.
Take a shirt with turmeric powder strain. Wash the shirt with soap. Do you observe any change in the colour? Why?
