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16. Which of the following is true about the twostatements? Statement I : Reactivity of aluminium decreaseswhen it is dipped in nitric acid. Statement II : A protective layer of aluminium nitrate is formed when aluminium is dipped in nitric acid. (NTSE Stage-II,2012-13)
I is correct but II is incorrect
I is incorrect but II is correct
80th the statements are correct and II is also the correct explanation of I
80th the statements are correct but II is not correct explanation of I
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17. An acid, obtained by destructive distillation of wood, which in turn gives acetic acid is (NTSE Madhya Pradesh, Stage-I, 2014-15)
Oxalic acid
Pyroligneous acid
Chloro acetic acid
Citric acid
18. When Sodium carbonate (Na 2C03) reacts with Silica (Si02) gives (NTSE Madhya Pradesh, Stage-I, 2014-15)
Soda glass
Water glass
Crook's glass
Pyrex glass
19. In order to decrease the rate of setting of cement, which compound is mixed in it? (NTSE Madhya Pradesh, Stage-I, 2014-15)
Ca(OH)2 (Slaked lime)
CaC03 (Calcium Carbonate)
CaS04.2H2O (Gypsum)
AI2O3 (Alumina)
20. Which one of the following oxides gives pink colour with phenolphthalein indicator in aqueous solution? (NTSE Andhra Pradesh, Stage-I, 2014-15)
N2O
NO
CaO
CO2
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