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| List-$I$ | List-$II$ |
| $1.$ Vinegar solution | $a.$ $pH = 7.4$ |
| $2.$ Blood | $b.$ $pH = 2.5$ |
| $3.$ Washing soda solution | $c.$ $pH = 7.0$ |
| $4.$ Pure water | $d.$ $pH = 12$ |
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