RRB NTPC General Science PDF in Hindi

 RRB NTPC General Science PDF in Hindi   



Important रासायनिक योगिक के नाम और सूत्र

जिप्सम==caso4.2H2o

Viranjak churn=ca(ocl)cl

Water gas co+h2

Producer gas ==co+n2

 सिंदूर==Hgs

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