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Q. जल में स्थाई कठोरता का कारण है ?

(A) मैग्नीशियम कार्बोनेट
(B) कैल्सियम क्लोराइड
(C) जिंक क्लोराइड
(D) कैल्सियम बाइकार्बोनेट
Correct Answer - Option(B) Science

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