hydrogen
oxygen
carbon (IV) oxide
sulphur (VI) oxide
Correct answer is C
No explanation has been provided for this answer.
Which of the following gases is colourless, odourless and soluble in potassium hydroxide solution?
NO 2
SO 2
NH 3
CO2
Correct answer is D
CO2 (carbon dioxide) is a colorless and odourless gas and very soluble in KOH owning that it is an acidic gas.
8g mol -1
16 gmol -1
32g mol -1
64g mol -1
Correct answer is C
Using the ideal gas equation,
PV = nRT.
where \(n = \frac{mass}{\text{molar mass}}\).
For Hydrogen, \(\frac{m_H}{M_H} = \frac{PV}{RT}\).
For element X, \(\frac{m_X}{M_X} = \frac{PV}{RT}\)
Under the same conditions implies \(\frac{PV}{RT}\) is the same for both hydrogen and X.
\(\frac{m_H}{M_H} = \frac{m_X}{M_X}\)
Molar mass of X = \(\frac{\text{molar mass of hydrogen} \times \text{mass of X}}{\text{mass of hydrogen}}\)
= \(\frac{1 \times 9.6}{0.3}\)
= 32 g/mol
Which of the following increases as boiling water changes to steam?
temperature of the system
degree of disorder in the system
number of molecules
activation energy
Correct answer is B
No explanation has been provided for this answer.
What is the shape of a molecule of CCI4?
Pyramidal
Tetrahedral
Trigonal planar
Linear
Correct answer is B
No explanation has been provided for this answer.