Which of the following is not a property of a base 1. has a bitter taste 2. feels slippery to the touch 3. reacts with active metals to produce hydrogen gas 4. increases the concentration of hydroxide ions in an aqueous solution

Base has formula .

Example of a base is a soap,

and it has a bitter taste, feels slippery to the touch.

From the formula we can see that a base has hydroxide ion (OH), so a base increases the concentration of hydroxide ions in an aqueous solution.

3. Reacts with active metals to produce hydrogen gas is not a property of the base; this is a property of acids.

i have no clue hope you find the answer

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.