Hydration of ions in solution is associated with
absorption of heat
reduction of heat
conduction of heat
liberation of heat
Correct answer is D
No explanation has been provided for this answer.
2.029 * 10-3mol dm-3
1.414 * 10-3mol dm-3
2.029 * 10-5mol dm-3
1.414 * 10-5mol dm-3
Correct answer is D
In order to calculate this, it suffices to calculate the solubility of Ag, so as to know the amount lost.
\(K_{sp} = [Ag^{+}][Cl^{-}]\)
Let the solubilty of Ag and Cl = d
\(2 \times 10^{-10} = d \times d= d^{2}\)
\(d = \sqrt{2\times10^{-10}}\)
= \(1.414 \times 10^{-5}moldm^{-3}\)
The air pollutant unknown in nature is
NO
CO
HCHO
DDT
Correct answer is C
Formaldehyde (HCHO) is the most important carcinogen in outdoor air among the 187 hazardous air pollutants (HAPs) identified by the U.S. Environmental Protection Agency (EPA)
Water molecule can be ligands especially when they are bonded to
alkaline earth metals
alkali metals
transition metals
group VII elements
Correct answer is C
No explanation has been provided for this answer.
A side effect of soft water is that
it gives offensive taste
excess calcium is precipitated
it attcaks lead contained in pipes
it encourages the growth of bacteria
Correct answer is C
No explanation has been provided for this answer.