In the purification of town water supply, alum is used principally to?
kill bacteria
control the pH of water
improve the taste of the water
coagulate small pasrticles of mud
Correct answer is D
No explanation has been provided for this answer.
CO2 ad ithe inert gases
N2, CO2 and the inert gases
N2 and the inert gases
water vapour, N2 and the inert gases
Correct answer is C
No explanation has been provided for this answer.
The greater the different in electronegativity between bonded atoms, the?
lower the polarity of the bond
higher the polarity of the bond
weaker the bond
higher the possibility of the substance formed being a molecule
Correct answer is B
Bond polarity and ionic character increase with an increasing difference in electronegativity.
The electronegativity (χ) of an element is the relative ability of an atom to attract electrons to itself in a chemical compound and increases diagonally from the lower left of the periodic table to the upper right.
oxyethylene flame
oxyhydrocarbon flame
oxyacetylene flame
oxymethane flame
Correct answer is C
No explanation has been provided for this answer.
Complete oxidation of propan -1- ol gives?
propanal
propan-2-al
propan-1-one
propanoic acid
Correct answer is D
No explanation has been provided for this answer.