Patakhon Ke Andar “ Hara Rang ” Kis Dhatu Ke Karan Paya Jata Hai ? पटाखों के अंदर “हरा रंग” किस धातु के कारण पाया जाता है ?

पटाखों के अंदर “हरा रंग” किस धातु के कारण पाया जाता है ?

Manmohan Yadav on 16-06-2016

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Comments KAPIL RAJ on 20-06-2016 Pramod Chaturvedi on 20-06-2016 jy sharma on 19-06-2016
Rajeev Kumar on 19-06-2016 Anu Sharma on 18-06-2016 Pooja Rathore on 18-06-2016 amol mane on 17-06-2016
shree bishnoi on 17-06-2016

GOPI KUMAR on 16-06-2016

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