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21. Which of the following is an are of mercury? (NTSE Maharashtra, Stage-I, 2015-16)
Bauxite
Haematite
Cinnabar
Dolomite
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22. Which of the following is the correct order of reactivity of metals? (NTSE Odisha, Stage-I, 2015-16)
Cu > Au > Zn > Na > H
Au > Na > H > Zn > Cu
Na > Zn > H > Cu > Au
H > Au> Cu > Zn > Na
23. Which of the following is an are of copper? (NTSEW Odisha, Stage-I, 2015-16)
Malachite
Siderite
Calamine
24. A metal is strongly heated in presence of air to form a black mass. So, the metal is(NTSE Odisha, Stage-I, 2016-17)
Potassium
Platinum
Copper
Zinc
25. Bauxite is an are of aluminium. It is concentrated suitably on treating with (NTSE Odisha, Stage-I, 2016-17)
Conc. NaOH solution
Na2C03
Coke and N2
Any of these
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