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Indicators

Only visual i...

Question

Only visual indicators such as red cabbage and turmeric can be called natural indicators.

A

True

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B

False

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Solution

The correct option is B False

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Q. Dora has three different solutions in test tubes labelled as A, B, and C. The table below shows the observations when red cabbage juice and turmeric solution are used as an indicator. Analyse the table and choose the correct option.

\begin{matrix} I n d i c a t o r & T u b e A & T u b e B & T u b e C R e d C a b b a g e J u i c e & R e d & P u r p l e & B l u i s h - g r e e n T u r m e r i c & Y e l l o w & Y e l l o w & R e d \end{matrix}

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B. All visual indicators are natural indicators.

Q. Which one of the following can be used as an acid-base indicator by a visually impaired student?
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(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves

Q. 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

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