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  1. The compound used in enrichment for uranium for nuclear power plant is
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  3. Na⁺, Mg²⁺, Al³⁺ and Si⁴⁺ are isoelectronic. The order of their ionic size is
  4. A bivalent metal has the equivalent weight of 12. The molecular weight
  5. What is the volume of ’20 volume H₂O₂. required to get 5000 cm³ of oxygen at STP?