Neco Chemistry Past Questions and Answers

Question 26:

• NECO 2001

The use of sulphur to vulcanize rubber is mad to make it ____________

A. Blacker.
B. Cheaper. .
C. More elastic
D. Tougher
E. Softer.

Question 27:

• NECO 2001

Which element contains the greatest number of moles?

A. 8 g of Helium
B. 48 g of Carbon
C. 78 g of Potassium
D. 130g of Zinc
E. 216g of Sliver

Question 28:

• NECO 2001

The position of an element in the Periodic Table is determined by ____________

A. Its atomic radius.
B. Its density.
C. Its relative atomic mass.
D. The number of protons in its atom.
E. The number of neutrons in its atoms

Question 29:

• NECO 2001

what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)

A. Artificial radioactivity
B. Nuclear fission
C. Nuclear fusion
D. Radio-decomposition
E. Spontaneous disintegration

Question 30:

• NECO 2001

Which compound can be used as a reducing agent in a reaction?

A. Cl₂
B. KMnO₄
C. KCr₂O₇
D. MnO₂
E. Na₂SO₃