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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 121:

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

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A 0.008
B 0.08
C 0.1
D 0.8
E 8.02

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Question 122:

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

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A 39.03
B 46.81
C 53.18
D 67.69
E 76.92

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Question 123:

Sulphur has an oxidation number of +4 in ____________

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A H₂S
B H₂S0₄
C MgSO₄
D Na₂SO₃
E S0₃

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Question 124:

Atomic size decreases ____________

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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

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Question 125:

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

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A Deliquescent
B Effervescent
C Efflorescent
D Fluorescent
E Hygroscopic

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