across a period from left to right
across a period from right to left
diagonally down the group
down a group
with decrease in atomic number
Correct answer is A
No explanation has been provided for this answer.
Sulphur has an oxidation number of +4 in
H2S
H2S04
MgSO4
Na2SO3
S03
Correct answer is D
No explanation has been provided for this answer.
If the volume of a gas at 35°C is 60cm3, what would be its volume in cm3 at 273k?
39.03
46.81
53.18
67.69
76.92
Correct answer is C
No explanation has been provided for this answer.
C\(_6\)H\(_{12}\)O\(_6\) What is the molar mass of the compound above? [ H=1, C=12, O=16 }
45
61
180
123
244
Correct answer is C
The compound above is identified as glucose
Carbon - 12 \(\times\) 6 atoms present
Hydrogen - 1 \(\times\) 12 atoms present
Oxygen - 16 \(\times\) 6 atoms present
= 72 + 12 + 96
= 180
hydrogen, oxygen
Hydrogen, tetraoxosulphate (VI) ion
oxygen, hydrogen
sulphur, hydrogen
sulphur, oxygen
Correct answer is C
No explanation has been provided for this answer.