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| $a. CO_{(g)} + H_{2(g)}$ | $i. Mg(HCO_3)_2 + Ca(HCO_3)_2$ |
| $b. \text{जल की अस्थायी कठोरता}$ | $ii. \text{एक इलेक्ट्रॉन न्यून हाइड्राइड}$ |
| $c. B_2H_6$ | $iii. \text{संश्लेषण गैस (Synthesis gas)}$ |
| $d. H_2O_2$ | $iv. \text{अतलीय संरचना}$ |
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