Neco Chemistry Past Questions and Answers

Question 121:

• NECO 2008

A solution is prepared by dissolving I .96g of H₂SO₄ in 250 cm³ of its solution. What is the concentration in moles per dm³?

A. 0.008
B. 0.08
C. 0.1
D. 0.8
E. 8.02

Question 122:

• 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 123:

• NECO 2009

Sulphur has an oxidation number of +4 in ____________

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

Question 124:

• 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 125:

• NECO 2009

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

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