Chemistry, 2015, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2015

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

31 - 40 of 64 Questions

#	Question	Ans
31.	Cu₂S_(s) + O2(g) = 2CU_(s) + SO2_2(g) A. +1 to 0 B. 0 to +2 C. +2 to +1 D. 0 to +1 Show Content Detailed Solution There is an explanation video available below.	A
32.	The number of isomers formed by C₆H₁₄ is A. 4 B. 5 C. 2 D. 3 Show Content Detailed Solution There is an explanation video available below.	B
33.	The basic particles from which matter could be made up of are as follow, except? A. Salt B. Atom C. Ion D. Molecule Show Content Detailed Solution Salt is a chemical used for varieties of purposes, so it’s not part of matter, Atom being the smallest part of molecule and ion are charge which are part of matter There is an explanation video available below.	A
34.	The energy value of petrol can be determined by A. Bomb calorimeter B. Catalytic cracker C. Fractionating column D. Thermometer Show Content Detailed Solution Fractionating column contains petrol with different densities. There is an explanation video available below.	C
35.	What volume of 0.5mldm³ H₂SO₄ will exactly neutralize 20cm³ of 0.1moldm³ NaOH Solution? A. 2.0cm³ B. 5.0cm³ C. 6.8cm³ D. 8.3cm³ Show Content Detailed Solution There is an explanation video available below.	A
36.	A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, Find the molecular formula [H = 1, C = 12, O = 16) A. CH₂O B. C₃H₆O₃ C. C₆H₁₂O₆ D. C₆H₁₂O₃ Show Content Detailed Solution There is an explanation video available below.	C
37.	An oxidation state of Cr in K2Cr2O7 A. 7 B. 6 C. 5 D. 4 Show Content Detailed Solution The oxidation state of K2Cr2O7 is +6. option A,C,D are the oxidation state of other elements like O7,C14, etc. \(+2 + 2x + (-2\times7) =0\) \(2x=12\) \(x = +6\) There is an explanation video available below.	B
38.	The elements that belong to the third period of periodic table are A. Li, Be, Al and D B. Na, P, O and Cl C. B, C, N, and O D. Na, Mg, S and Ar Show Content Detailed Solution Na, Mg, S and Ar is the set of elements that belong to third period of the periodic table. Option A,B,C have elements which belong to the other period in the periodic table included in them. There is an explanation video available below.	D
39.	When sugar is dissolve in tea, the reaction is accomplished by A. positive change B. negative entropy change C. no entropy change D. a minimum entropy change Show Content Detailed Solution No entropy change because the sugar will not change the chemical equivalent of the tea. Options A,B,D are not appropriate because they will change the chemical combination of the tea There is an explanation video available below.	A
40.	NH_3(g) + HCl_(s) → NH ₄Cl _(s) The entropy change in the system above is A. positive B. zero C. negative D. intermediate Show Content Detailed Solution There is an explanation video available below.	C

31.	Cu₂S_(s) + O2(g) = 2CU_(s) + SO2_2(g) A. +1 to 0 B. 0 to +2 C. +2 to +1 D. 0 to +1 Show Content Detailed Solution There is an explanation video available below.	A
32.	The number of isomers formed by C₆H₁₄ is A. 4 B. 5 C. 2 D. 3 Show Content Detailed Solution There is an explanation video available below.	B
33.	The basic particles from which matter could be made up of are as follow, except? A. Salt B. Atom C. Ion D. Molecule Show Content Detailed Solution Salt is a chemical used for varieties of purposes, so it’s not part of matter, Atom being the smallest part of molecule and ion are charge which are part of matter There is an explanation video available below.	A
34.	The energy value of petrol can be determined by A. Bomb calorimeter B. Catalytic cracker C. Fractionating column D. Thermometer Show Content Detailed Solution Fractionating column contains petrol with different densities. There is an explanation video available below.	C
35.	What volume of 0.5mldm³ H₂SO₄ will exactly neutralize 20cm³ of 0.1moldm³ NaOH Solution? A. 2.0cm³ B. 5.0cm³ C. 6.8cm³ D. 8.3cm³ Show Content Detailed Solution There is an explanation video available below.	A

36.	A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, Find the molecular formula [H = 1, C = 12, O = 16) A. CH₂O B. C₃H₆O₃ C. C₆H₁₂O₆ D. C₆H₁₂O₃ Show Content Detailed Solution There is an explanation video available below.	C
37.	An oxidation state of Cr in K2Cr2O7 A. 7 B. 6 C. 5 D. 4 Show Content Detailed Solution The oxidation state of K2Cr2O7 is +6. option A,C,D are the oxidation state of other elements like O7,C14, etc. \(+2 + 2x + (-2\times7) =0\) \(2x=12\) \(x = +6\) There is an explanation video available below.	B
38.	The elements that belong to the third period of periodic table are A. Li, Be, Al and D B. Na, P, O and Cl C. B, C, N, and O D. Na, Mg, S and Ar Show Content Detailed Solution Na, Mg, S and Ar is the set of elements that belong to third period of the periodic table. Option A,B,C have elements which belong to the other period in the periodic table included in them. There is an explanation video available below.	D
39.	When sugar is dissolve in tea, the reaction is accomplished by A. positive change B. negative entropy change C. no entropy change D. a minimum entropy change Show Content Detailed Solution No entropy change because the sugar will not change the chemical equivalent of the tea. Options A,B,D are not appropriate because they will change the chemical combination of the tea There is an explanation video available below.	A
40.	NH_3(g) + HCl_(s) → NH ₄Cl _(s) The entropy change in the system above is A. positive B. zero C. negative D. intermediate Show Content Detailed Solution There is an explanation video available below.	C

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