A student was given four unknown colourless samples labelled A,B, C, & D and asked to test their pH using
pH paper. He observed that colour of pH turned to light green, dark red, light orange & dark blue with
samples ABC, & D respectively
Which indicator is quoted on pH paper?​
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A student was given four unknown colourless samples labelled A, B, C and D and asked to test their pH using pH paper. He observed that the colour of pH paper turned to light green, dark red, light orange and dark blue with samples A, B, C and D respectively. the correct sequence of increasing order of the pH value for samples is
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