Which of the following cannot be used as an acid-base indicator?

Chilly powder

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Whitepaper

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Carbon powder

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Liquid blue

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct options are
A
Chilly powder

B
Whitepaper

C
Carbon powder

D
Liquid blue

Indicators are substances that help us to distinguish between acids and alkalis through colour change. If something does not change its colour in both acid and an alkali, then that substance cannot be used as an indicator. Table below shows the colour change of the mentioned substances in acid and alkali solutions.

$\begin{matrix} Substance Used & C o l o u r i n A c i d & C o l o u r i n A l k a l i Chilly Powder & P a l e R e d & P a l e R e d White Paper & W h i t e & W h i t e Carbon Powder & B l a c k & B l a c k Liquid Blue & B l u e & B l u e \end{matrix}$

Chilly powder, white paper, liquid blue and carbon powder does not show any colour change in both acid and an alkali solution. Hence these all cannot be used as an indicator.

Suggest Corrections

Similar questions

The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is :

(a) carbon dioxide (b) hydrochloric acid (c) hydrogen sulphide (d) carbon disulphide

N a H C O_{3}

N a H C O_{3}

C a (H_{2} P O_{4})_{2}

N a H C O_{3}

N a A l (S O_{4})_{2}

C a (H_{2} P O_{4})_{2}

N a A l (S O_{4})_{2}

Join BYJU'S Learning Program