Column A
Column B
1.
a. pH paper
b. Litmus paper
3.
only tells
you acid
or base
can tell
you the
pH
number
turns red
or blue
only
can turn
a variety
of colors
that
represent
different
pH
numbers

a. pH paper can tell you the pH. pH paper only can turn a variety of colors that represent different pH numbers.

B. Litmus paper only tells you acid or base in order to turns red or blue color.

Explanation:

pH paper is a type of paper which is used for the identification of pH of the substance. On pH paper, colors are present which shows pH numbers of a solution while litmus paper is a type of paper which is used for the identification of solution whether it is acidic or basic. There are two colors i. e. Red and Blue. If the litmus paper turns red, the solution is acidic or if the litmus paper turns blue, the solution is alkaline or basic.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

it is stable as it is in group 0 which have full outer shells of electrons