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प्रश्न
Match the items in Column I with the relevant item in Column II.
| Column I | Column II |
| (i) Hydrogen peroxide is used as a | (a) zeolite |
| (ii) Used in Calgon method | (b) perhydrol |
| (iii) Permanent hardness of hard water is removed by | (c) sodium hexametaphosphate |
| (d) propellant |
उत्तर
| Column I | Column II |
| (i) Hydrogen peroxide is used as a | (b) perhydrol |
| (ii) Used in Calgon method | (c) sodium hexametaphosphate |
| (iii) Permanent hardness of hard water is removed by | (a) zeolite |
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