0.2\(gdm^{-3}\)
1.0\(gdm^{-3}\)
2.0\(gdm^{-3}\)
5.0\(gdm^{-3}\)
Correct answer is B
Solubility in \(gdm^{-3}\) = \(\frac{mass of salt in gram}{volume of liquid in dm^{3}}\)
200\(cm^{3}\) = \(\frac{200}{1000} dm^{3} = 0.2dm^{3}\)
Solubility = \(\frac{0.2g}{0.2dm^{3}}\)
= 1.0\(gdm^{-3}\)
Solubility curve can be used in the determination of the
amount of crystals formed
amount of solvent that can be recovered
amount of solid drugs in a given solution
temperature of the solution
Correct answer is C
No explanation has been provided for this answer.
When water was added to a white anhydrous substance X, the colour changed to blue. X is
\(CuSO_{4}\)
\(FeSO_{4}\)
\(Na_{2}SO_{4}\)
\(PbSO_{4}\)
Correct answer is A
When water is added to white coloured anhydrous copper sulphate, its colour changes to blue, indicating that the blue coloured copper sulphate pentahydrate is regenerated.
Potassium Chloride solid does not conduct electricity because
it is a covalent compound
strong cohesive forces make its ions immobile
strong cohesive force makes its molecule immobile
each of potassium and chlorine structures contain noble gas structure
Correct answer is B
For a substance to conduct electricity, it must have charge particles like electrons and ions within it that are able to move freely throughout it. In its solid state, potassium chloride (like many other ionic compounds) have fixed ions, hence, they are immobile and can't conduct electricity.
Halogens generally react with metals to form
alkalis
acids
bases
salts
Correct answer is D
The word "halogen" is a Greek word meaning salt former, because they form salts when they react with metals eg NaCl.