द फोर्स एक्सर्टेड बाय मैग्नेट से इस कॉल्ड एस मैग्नीफाइड और मैग्नेटिक फोर्स आफ अट्रैक्शन
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A solution which does not change the colour of blue litmus paper can be either basic or neutral in nature. The nature of the solution can be confirmed by placing a drop on red litmus paper. If the colour change to blue then the solution is basic and if no colour change is observed, the solution is neutral in nature.
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