Choose the INCORRECT statement.
A) Elemental silicon is produced by reduction of SiO2 with coke.
B) In silica each silicon atom is bonded directly to four other silicon atoms.
C) Coke is made by heating coal in the absence of air.
D) Charcoal is made by heating wood in the absence of air.
E) Allotropes of carbon include diamond, graphite, fullerenes and nanotubes.
Correct Answer:
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Q60: Both gypsum and plaster of Paris contain
Q62: One of the most important commercial processes
Q63: Choose the INCORRECT equation.
A) CaO + 3
Q64: Graphite and diamond are:
A)allotropes
B)amorphous substances
C)bivalent
D)elastomers
E)very unstable
Q66: Choose the molecular shape for BCl3.
A) trigonal
Q68: Choose the INCORRECT statement about carbon.
A) Carbon
Q69: Choose the INCORRECT statement.
A)Amphoteric means useful in
Q72: Choose the INCORRECT statement.
A)A glass is an
Q77: Which of the following elements forms a
Q80: Choose the INCORRECT statement.
A)The strong C-C and
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