Steam changes the colour of anhydrous cobalt (II) chloride from
blue to pink
white to red
white to green
blue to white
Correct answer is A
No explanation has been provided for this answer.
The property which makes alcohol soluble in water is the
boiling point
hydrogen bonding
ionic character
covalent nature
Correct answer is B
No explanation has been provided for this answer.
The furring of kettles is caused by the presence in the water of?
Calcium tetraoxosulphate (VI)
Calcium hydrogentrioxocarbonate (IV)
Calcium hydroxide
Calcium trioxocarbonate (IV)
Correct answer is D
The furring of kettles or boilers - this is as a result of the decomposition of \(Ca(HCO_3)_2\) into \(CaCO_3\), and this\(CaCO_3\) coats the inside of a kettle or boiler used in heating water containing dissolved \(Ca(HCO_3)_2\).
The substance least considered as a source of environmental pollution is
Lead compounds
Organophosphorous compounds
Silicate minerals
Uranium
Correct answer is C
No explanation has been provided for this answer.
0.5 mol dm3
0.6 mol dm3
0.2 mol dm3
0.4 mol dm3
Correct answer is A
No explanation has been provided for this answer.