Answer:
it does not depend on the temperature
The correct description that holds true for the above question would be B. Atomic number - 29 and Mass Number - 63.
Answer is: A. test and determine the pH values of unknown solutions.
Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations (pH or pOH values).
Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄). Phenolphthalein is colorless in acidic solutions and pink in basic solutions.
Another example is methyl orange. It is red colour in acidic solutions and yellow colour in basic solutions.
The first one is right and so is eight you have to add them together to see if they go together if they dont add what is missing
