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6. ___ is used as electrodes in batteries and composites in aircrafts (NTSE Odisha, Stage-I, 2013-14)
Diamond
Graphite
Activated charcoal
Carbon black
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7. Salt made of non-metallic elements only is (NTSE Rajasthan, Stage-I, 2014-15)
NaCI
NH4CI
AIN
MgCI2
8. Metals like sodium, potassium, calcium and magnesium are extracted by electrolysis of their chlorides in molten state. These metals are not extracted by reduction of their oxides with carbon because (a) Reduction with carbon is very expensive. (b) Carbon readily makes alloys with these metals. (c) Carbon has less affinity for oxygen. (d) Carbon is a weaker reducing agent than these metals. (NTSE Stage-II,2013-14)
(a) & (b)
(b) & (c)
(c) & (d)
(d) & (a)
9. Non-metals react with oxygen to form..... or .... Oxides (NTSE Punjab, Stage-I, 2015-16)
Acidic, Neutral
Acidic, Basic
Basic, Neutral
Basic, Acidic
10. Which one of the following is not a semiconductor (NTSE Uttar Pradesh, Stage-I, 2015-16)
Pure silicon
Pure germanium
Germanium with arsenic
Silver
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