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46. Hydrogen gas is not liberated when Pb is reacted with conc. HN03 because
Pb is less reactive than hydrogen
Pb is more reactive than hydrogen
Conc. HN03 is strong reducing agent
Conc. HN03 is strong oxidising agent
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47. Which of the following electrovalent compound both cation and anion represent the same inert gas configuration?(NTSE Andhra Pradesh, Stage-I, 2015-16)
Calcium bromide
Magnesium chloride
Strontium oxide
Potassium sulphide
48. Copper sulphate solution is electrolysed with platinum electrodes. Which of the following changes does not occur in the process? (NTSE Odisha, Stage-I, 2016-17)
The blue colour of the solution gradually fades
02(g) is liberated at anode
pH of the solution decreases
H+concentration decreases
49. Which of the following salts fails to give brown gas on heating? (NTSE Odisha, Stage-I, 2016-17)
Lead nitrate
Lithium nitrate
Magnesium nitrate
Potassium nitrate
50. Pick up the incorrect pair of metal-ore from the following (NTSE Odisha, Stage-I, 2016-17)
Ag-Galena
Mg-Carnallite
Sn-Cassiterite
Hg-Cinnabar
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