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Chemistry
Diamond is an allotrope of:
A
Silicon
B
Carbon
C
Sulfur
D
Phosphorus
Correct Answer
B
Chemistry
Which gas is responsible for acid rain?
A
Hydrogen
B
Sulfur dioxide
C
Nitrogen
D
Helium
Correct Answer
B
Chemistry
The chemical symbol of Silver is:
A
Si
B
Ag
C
Au
D
Sr
Correct Answer
B
Chemistry
Avogadro's number is:
A
6.02 ร 10ยฒยณ
B
3.14 ร 10ยฒยณ
C
9.8 ร 10ยฒยณ
D
1.6 ร 10?ยน?
Correct Answer
A
Chemistry
Which metal is liquid at room temperature?
A
Sodium
B
Mercury
C
Iron
D
Copper
Correct Answer
B
Chemistry
The molecular formula of methane is:
A
CH?OH
B
C?H?
C
CH?
D
C?H?
Correct Answer
C
Chemistry
Which gas is used in balloons?
A
Oxygen
B
Nitrogen
C
Chlorine
D
Helium
Correct Answer
D
Chemistry
Who discovered the nucleus of an atom?
A
Dalton
B
Rutherford
C
Thomson
D
Bohr
Correct Answer
B
Chemistry
The formula of common salt is:
A
KCI
B
Na?CO?
C
NACL
D
CaCl?
Correct Answer
C
Chemistry
Which particle has no charge?
A
Proton
B
Electron
C
Neutron
D
Ion
Correct Answer
C