XY
X2Y
XY2
X3Y2
X2Y3
Correct answer is E
Element X is aluminum of valency 3+
Element Y is oxygen of valency 2-
Their combination is \(Al_{2}O_{3}\)
164 cm3
168 cm3
179.1.cm3
201.5cm3
546 cm3
Correct answer is B
No explanation has been provided for this answer.
A measure of the degree of disorderliness in a chemical system is known as the
activation energy
enthalpy
entropy
equilibrium
free energy.
Correct answer is C
No explanation has been provided for this answer.
allotropes of each other.
both disaccharides
dimere of each other.
isomers of each other
isotopes of each other
Correct answer is D
No explanation has been provided for this answer.
Detergents are better than soaps for washing in hard water because
hard water contains insoluble calcium salts.
they contain bleaching powder.
they contain palmitic acid.
they do not form insoluble calcium and magnesium salts.
they are organic compounds.
Correct answer is D
No explanation has been provided for this answer.