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Which one among the following substances evolves heat when dissolved in water? निम्नलिखित में से वह कौन-सा एक पदार्थ है‚ जिसके जल में घुलने पर ऊष्मा उत्पन्न होती है?

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Which one among the following substances evolves heat when dissolved in water? निम्नलिखित में से वह कौन-सा एक पदार्थ है‚ जिसके जल में घुलने पर ऊष्मा उत्पन्न होती है?






 
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