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Kharidna samay kala istamal ma layo …

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Kharidna samay kala istamal ma layo ho lal

Posted by Ritesh Singh 4 years ago

CBSE > Class 04 > हिंदी

3 answers

Ritesh Singh 4 years ago

Main pachna ke bare mein nahin poochha tha

Gaurav Seth 4 years ago

कोयला, जिसे आप खरीदते हो तो रंग काला, उपयोग करते हो तो लाल और फेंकते हो तो सफेद होता है |

Explanation:

जब हम किसी लकड़ी को जलाते हैं और जब लकड़ी पूरी तरह से जल चुकी होती है तब हमें कोयला उत्पाद के रूप में प्राप्त होता है |

कोयला पुनः आग जलाने में काम आता है | आपने देखा होगा गांवों में लोग सिगड़ी जलाकर आंच सेकते हैं या आपने सुना होगा की कोयले ईंधन से कुछ समय पूर्व रैलगाड़ी चलती थी | कोयला जब जलता है तब उसका रंग लाल होता है |

कोयला की गुणवत्ता उसमे उपस्थित कार्बन की मात्रा से तय की जाती है |

एन्थ्रेसाइट (कार्बन की मात्रा 94-98%)

बिटूमिनस (कार्बन की मात्रा 78-86%)

लिग्नाइट (कार्बन की मात्रा 28-30%)

पीट (कार्बन की मात्रा 27%)

जब कोयला जल चुका होता है तो अंत में हमें राख प्राप्त होती है जो की सफेद रंग की होती है |

Ritesh Singh 4 years ago

Koyla

ANSWER

http://mycbseguide.com/examin8/

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