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presence of sodium carbonate causes hardness of water
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5. option c : Ethane
6. option b : Magnesium sulphate
Explanation:
5. Addition reaction happens only with unsaturated compounds. Here except Ethane , other compounds are unsaturated compounds ( compounds with double/triple bond ) . So Ethane , as it is not unsaturated => it will not undergo addition reaction.
6. Hardness of water is caused by magnesium/calcium salts.
Here , we have Magnesium sulphate which a magnesium salt => it will cause hardness of water.
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