Q75 of 400 Page 194

Which of the following pair of metals exists in their native state in nature?

Au and Ag is the pair of metals exists in their native state in nature.

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73 Which of the following is an ore of mercury metal?

Options||A. rock salt


B. cinnabar


C. calamine


D. haematite

 74 Calamine ore can be used to extract one of the following metals. This metal is: 76 Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks? 77 Which of the following alloys contains a non-metal as one of the constituents?