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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 16:

The brown coloration in nitric acid prepared in the laboratory can be removed by?

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A Heating the acid
B Bubbling air through the acid
C Cooling the acid
D Adding a decolorizing agent
E Adding a base

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Question 17:

Which of the following processes takes place during electrolysis?

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A Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral
B Negative ions are dicharged at the anode by gaining suficient electrons to become neutral
C Positive ions are discharged at the anode by losing sufficient electrons to become neutral
D Negative ions are discharge at the anode by losing sufficient electrons to become neutral
E Nothing happens

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Question 18:

In the preparation of ammonia, which of the following is used as the drying agent?

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A CaO
B CaCI₂
C Conc. H₂SO₄
D P₂O₅
E H₃PO₄

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Question 19:

Which of the following can have an isomer?

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A C₂H₄
B C₄H₁₀
C C₃H₈
D C₂H₆
E C₆H₆

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Question 20:

Allotropes are elements having?

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A Different physical but the same chemical properties
B Different chemical but the same physical properties
C The same chemical and physical properties
D Different atomic structure
E The same position in the periodic table

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