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What happens when a base is mixed with water?
(a)
Decrease in the concentration of atoms () per unit volume.
(b)
Decrease in the concentration of ions () per litre volume.
(c)
increase in the concentration of ions () per unit volume.
(d)
Decrease in the concentration of ions () per unit volume.

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Important Questions on Acids and Bases
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The bulb is not glowing in this experimental setup. Because:

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Which of the following is a strong acid?

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A solution of a base with pH is given.
Which of the following can be done to decrease its pH?
P) add distilled water to it.
Q) add a solution of a different base with pH 8.7.
R) add a few drops of an acid with an unknown pH.

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