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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
- Both acids and bases change colour of all indicators.
- If an indicator gives a colour change with an acid, it does not give a change with a base.
- If an indicator changes colour with a base, it does not change colour with an acid.
- Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
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:
Onion and vanilla extract are..........................indicators.
Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels)?
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
Fill in the following blank with suitable words:
Alkalis have a pH.............. than 7.
What colour would the universal indicator show in an aqueous solution of sugar? Why?
Turmeric and litmus are _________ acid-base indicators.
Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. Explain how it works.
(Hint: Prepare baking soda solution in water. Use this solution to write the message on a sheet of white paper with a cotton bud. Rub a slice of fresh beetroot over the message.)
