What is the percentage of sulphur in sulphur (IV) oxide?
66%
25%
40%
50%
Correct answer is D
molar mass of SO 2=64 :.%S=32/64 x 100 = 50%
A mixture is different from a compound because
the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents
a mixture is always homogeneous while a compound is not
the constituent of a compound are chemically bound together while those of a mixture are not
a mixture can be represented by a chemical formula while a compound cannot
Correct answer is C
No explanation has been provided for this answer.
22.4 dm 3
11.2 dm 3
6.5 dm 3
5.6 dm 3
0.00 dm 3
Correct answer is D
No explanation has been provided for this answer.
Zn ++
Ca++
Ai+++
Pb++
Cu++
Correct answer is A
No explanation has been provided for this answer.
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?
Steel electrodes
Carbon electrodes
Mercury electrodes
Carbon anode and steel cathode
Carbon cathode and stell anode
Correct answer is B
No explanation has been provided for this answer.