Neco Chemistry 2009 Past Questions and Answers

Question 1:

• NECO 2009

If the volume of a gas at 35°C is 60cm³, what would be its volume in cm³ at 273k?

A. 39.03
B. 46.81
C. 53.18
D. 67.69
E. 76.92

Question 2:

• NECO 2009

Sulphur has an oxidation number of +4 in ____________

A. H₂S
B. H₂S0₄
C. MgSO₄
D. Na₂SO₃
E. S0₃

Question 3:

• NECO 2009

Atomic size decreases ____________

A. Across a period from left to right
B. Across a period from right to left
C. Diagonally down the group
D. Down a group
E. With decrease in atomic number

Question 4:

• NECO 2009

A salt which loses its mass when exposed to air is ____________

A. Deliquescent
B. Effervescent
C. Efflorescent
D. Fluorescent
E. Hygroscopic

Question 5:

• NECO 2009

When air is passed through alkaline pyrogallol and then lime water, the gases left are ____________

A. Nitrogen and carbon (IV) oxide
B. Nitrogen and noble gases
C. Nitrogen and oxygen
D. Nitrogen, carbon (VI) oxide and noble gases
E. The noble gases