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Chemistry
Which particle has a negative electrical charge?
A
Proton
B
Neutron
C
Electron
D
Nucleus
Correct Answer
C
Chemistry
What is the molecular formula of water?
A
CO?
B
H?O
C
O?
D
H?
Correct Answer
B
Chemistry
Which element has the chemical symbol Fe?
A
Fluorine
B
Iron
C
Francium
D
Fermium
Correct Answer
B
Chemistry
What is the pH of pure water at 25ยฐC?
A
5
B
6
C
7
D
8
Correct Answer
C
Chemistry
Which gas is most abundant in Earth's atmosphere?
A
Oxygen
B
Nitrogen
C
Carbon dioxide
D
Hydrogen
Correct Answer
B
Chemistry
What is the atomic number of Oxygen?
A
6
B
7
C
8
D
9
Correct Answer
C
Chemistry
What is the chemical symbol for Sodium?
A
So
B
Na
C
Sd
D
S
Correct Answer
B
Chemistry
Which compound is known as lunar caustic?
A
KNO3
B
AgNO3
C
NaOH
D
None of these
Correct Answer
B
Chemistry
Which one of the following forms weak electrolyte solution with water?
A
CH?COOH
B
H?SO?
C
NaCl
D
None of these
Correct Answer
A
Chemistry
The shielding effect across the period _______?
A
Increase
B
Decrease
C
Same
D
None of these
Correct Answer
B