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Which of the following is/ are responsible for causing the hardness of water? Options: 1) Calcium carbonate 2) Magnesium carbonate 3) Sodium nitrate 4)

Which of the following is/ are responsible for causing the hardness of water? Options: 1) Calcium carbonate 2) Magnesium carbonate 3) Sodium nitrate 4) Both 1 and 2

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