10th Class Science Metals and Non-metals Question Bank 10th CBSE Science Metals and Non-metals

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      A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, where as Z is a good conductor of electricity. Identify X, Y and Z.     


                      Manganese (Mn) and magnesium (Mg) are the examples of two metals that react with very dilute HNO, to evolve hydrogen gas.

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