Neco Chemistry Past Questions and Answers

Question 16:

• NECO 2001

Fructose and glucose are ____________

A. Allotropes of each other.
B. Both disaccharides
C. Dimere of each other.
D. Isomers of each other
E. Isotopes of each other

Question 17:

• NECO 2001

A measure of the degree of disorderliness in a chemical system is known as the ____________

A. Activation energy
B. Enthalpy
C. Entropy
D. Equilibrium
E. Free energy.

Question 18:

• NECO 2001

When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm³ of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?

A. 164 cm³
B. 168 cm³
C. 179.1.cm³
D. 201.5cm³
E. 546 cm³

Question 19:

• NECO 2001

if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is ____________

A. XY
B. X₂Y
C. XY₂
D. X₃Y₂
E. X₂Y₃

Question 20:

• NECO 2001

Which compound is a component of baking powder?

A. Na₂CO₃
B. Na₂SO₄
C. KH₂CO₃
D. NaHCO₃
E. NaHSO₄