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in Chemistry by (122k points)
जल स्थायी रूप में कठोर होता है जब इनमे उपस्थित होते है -
A. Mg तथा Ca के क्लोराइड तथा सल्फेट
B. Na तथा K के बाइकार्बोनेट
C. Na तथा K के कार्बोनेट
D. Na तथा K के फॉस्फेट

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