Indicators

Author:Subject Experts
7th CBSE
IMPORTANT

Important Questions on Indicators

EASY
IMPORTANT

In Chemistry practical examination, three friends DEAN, BEAN, and SEAN were given test tubes. A, B, and C filled with solutions respectively. DEAN added blue litmus, BEAN added methyl orange and SEAN added the litmus solution to the given test tube respectively. DEAN found blue litmus turning red, BEAN observed methyl orange turning yellow but SEAN found no action in solution provided to him in the test tube. Comment on the nature of the three solutions given.

MEDIUM
IMPORTANT

By using the moist blue litmus paper, classify the given compounds given below as acids and bases:Ca(OH)2, H 2SO4, CH3COOH, NaOH , KOH , Mg(OH)2, HNO3 , NH4OH

EASY
IMPORTANT

Acids turn methyl orange solution to pink. 

MEDIUM
IMPORTANT

Mention the acidic or basic or neutral nature of solutions by using the phenolphthalein indicator.

EASY
IMPORTANT

Mention the acidic or basic or neutral nature of solutions by using methyl orange.

EASY
IMPORTANT

Mention the acidic or basic or neutral nature of solutions by using litmus.

EASY
IMPORTANT

What are indicators? Give examples.