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59. इनमें से कौन-सी संतुलित अभिक्रिया है? Which of the following is a balanced reaction?(a) 2Mg +O22MgO(b) CaCO32CaO +CO2(c) Zn +HClZnCl2 +H2(d) 2Na +2H2O2NaOH +H2Ans: (a, मानव का बारम्बार श्रवण शक्ति सीमा क्षेत्र कितना है? What is the frequency limit of human hearing range?"

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<sup>59. </sup>इनमें से कौन-सी संतुलित अभिक्रिया है?<sup> Which of the following is a balanced reaction?</sup><br /><sup>(a) 2Mg +O22MgO</sup><br /><sup>(b) CaCO32CaO +CO2</sup><br /><sup>(c) Zn +HClZnCl2 +H2</sup><br /><sup>(d) 2Na +2H2O2NaOH +H2</sup><br />Ans: (a, मानव का बारम्बार श्रवण शक्ति सीमा क्षेत्र कितना है? What is the frequency limit of human hearing range?"






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