किन आयनो के कारण जल मे कठोरता होती है?

Asked Nov 18, 2023 Modified Nov 18, 2023 Viewed 0 times
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asked Nov 18, 2023 at 19:42
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कैल्सियम , मैग्नीशियम
answered Nov 18, 2023 at 19:42

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