Chemistry, 1981, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

1981

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

11 - 20 of 49 Questions

#	Question	Ans
11.	The number of atoms in one mole of a substance is equal to? A. the atomic number B. the avogadro number C. the gas constant D. the number of neutrons E. the number of electrons Show Content Detailed Solution Avogadro's number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance.	B
12.	Which of the following statements is NOT true of electrovalent compounds? A. They are solids B. They do not vaporized easily C. They usually dissolve in water D. The elements forming the compounds normally have their valency electrons in a shared state E. They conduct electricity	D
13.	If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ? A. a drying agent B. an oxidizing agent C. a dehydrated agent D. a reducing agent E. a hydrolysing agent	C
14.	In the reaction C + 2HNO₃ → CO₂ + NO₂ + NO + H₂O nitric acid is acting as? A. a reducing agent B. a nitrating agent C. an oxidizing agent D. a catalytic agent E. a neutralizing agent	C
15.	The brown coloration in nitric acid prepared in the laboratory can be removed by? A. heating the acid B. bubbling air through the acid C. cooling the acid D. adding a decolorizing agent E. adding a base	B
16.	Which of the following processes takes place during electrolysis? 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	D
17.	In the preparation of ammonia, which of the following is used as the drying agent? A. CaO B. CaCI₂ C. H₂SO₄ D. P₂O₅ E. H₃PO₄	A
18.	Which of the following can have an isomer? A. C₂H₄ B. C₄H₁₀ C. C₃H₈ D. C₂H₆ E. C₆H₆	B
19.	Allotropes are elements having? 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	A
20.	A polymerization reaction is one in which? A. small molecules form giant molecules B. atoms form molecules C. giant molecules form small molecules D. molecules form volatile compounds E. a molecule rearranges itself	A

11.	The number of atoms in one mole of a substance is equal to? A. the atomic number B. the avogadro number C. the gas constant D. the number of neutrons E. the number of electrons Show Content Detailed Solution Avogadro's number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance.	B
12.	Which of the following statements is NOT true of electrovalent compounds? A. They are solids B. They do not vaporized easily C. They usually dissolve in water D. The elements forming the compounds normally have their valency electrons in a shared state E. They conduct electricity	D
13.	If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ? A. a drying agent B. an oxidizing agent C. a dehydrated agent D. a reducing agent E. a hydrolysing agent	C
14.	In the reaction C + 2HNO₃ → CO₂ + NO₂ + NO + H₂O nitric acid is acting as? A. a reducing agent B. a nitrating agent C. an oxidizing agent D. a catalytic agent E. a neutralizing agent	C
15.	The brown coloration in nitric acid prepared in the laboratory can be removed by? A. heating the acid B. bubbling air through the acid C. cooling the acid D. adding a decolorizing agent E. adding a base	B

16.	Which of the following processes takes place during electrolysis? 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	D
17.	In the preparation of ammonia, which of the following is used as the drying agent? A. CaO B. CaCI₂ C. H₂SO₄ D. P₂O₅ E. H₃PO₄	A
18.	Which of the following can have an isomer? A. C₂H₄ B. C₄H₁₀ C. C₃H₈ D. C₂H₆ E. C₆H₆	B
19.	Allotropes are elements having? 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	A
20.	A polymerization reaction is one in which? A. small molecules form giant molecules B. atoms form molecules C. giant molecules form small molecules D. molecules form volatile compounds E. a molecule rearranges itself	A