Which is the chief ore of copper?
Galena
Copper pyrites
Sphalerite
Siderite
Additional Questions
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Mercury is a liquid metal because |
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The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because |
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The bonds present in the structure of dichromate ion are |
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Which of the following lanthanoid ions is diamagnetic? (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70) |
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The methods chiefly used for the extraction of lead and tin from their ores are respectively |
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Which do not decolourise KMnO4 aqueous solution? |
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(NH4)2Cr2O7 on heating gives a gas which is also given by |
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Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect? |
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Which of the statements is not true? |
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During the extraction of gold the following reactions take place Au + CN– + H2O $\xrightarrow{O_2}$ [X] [X] + Zn → [Y] + Au X and Y are respectively |
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