Which statement is NOT true about the composition of starch?
It contains only the atoms of carbon, hydrogen oxygen
It is a polysaccharide
Its empirical formula is C2H20.
It is made from the monomerC6H12O6.
The hydrogen and oxygen atoms are in the ratio 2:1.
Correct answer is C
No explanation has been provided for this answer.
Which compound is a component of baking powder?
Na2CO3
Na2SO4
KH2CO3
NaHCO3
NaHSO4
Correct answer is D
No explanation has been provided for this answer.
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.