What is the change is colour obtained with acids and bases with these 4 flowers
A) Petunia
B) Hydrangea
C) Germanium
D) China Rose

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Hello! Abishek 
Pentunia - The anthocyanin petunin changes from reddish-purple in an acidic solution to violet in a basic solution.
Hydrangea - Red or pink blooms result from neutral or basic soil (pH 7 and above), whereas blue blooms indicate acidic conditions (pH less than 7).
Germanium - Geraniums contain the anthocyanin pelargonidin, which changes from orange-red in an acidic solution to blue in a basic solution.
China Rose - China rose converts acidic solution to dark pink, basic solutions to green colour and has no colour change for neutral solutions.
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