Chemistry Past Questions

Exam Type:

Exam year:

Question Type:

Topics:

Clear Selections
Change Subject Post a Question Check Syllabus Study My Bookmarks Past Questions Videos Watch Video Lessons Download App

Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208

WAEC offline past questions - with all answers and explanations in one app - Download for free

WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709

3701

For the general equation of the nature
xP + yQ ⇌ mR + nS, the expression for the equilibrium constant is

A. k[P]\(^x\)[Q]\(^y\)
B. \(\frac{m[R][S]}{x[P]y[Q]}\)
C. \(\frac{[P]^x[Q]^y}{[R]^m[S]^n}\)
D. \(\frac{[R]^m[S]^n}{[P]^x[Q]^y}\)

View Answer & Discuss JAMB 2019

3702

Which of the following reactions is an oxidation process?

A. 2H\(^+\) + 2e\(^-\) \(\to\) H\(_2\)
B. 2O\(^{2-}\) + 4e\(^-\) \(\to\) O\(_2\)
C. OCl\(^-\) + H\(_2\)O + 2e\(^-\) \(\to\) 2OH\(^-\) + Cl\(^-\)
D. Cl + e\(^-\) \(\to\) Cl\(^-\)

View Answer & Discuss (2) JAMB 2019

3703

If acidified Potassium Dichromate(VI) (K\(_2\)Cr\(_2\)O\(_7\)) acts as oxidizing agent, color changes from

A. yellow to green
B. orange to green
C. yellow to red
D. orange to red

View Answer & Discuss JAMB 2019

3704

The heat of formation of ethene, C\(_2\)H\(_4\) is 50 kJmol\(^{-1}\), and that of ethane, C\(_2\)H\(_6\) is -82kJmol\(^{-1}\). Calculate the heat evolved in the process:

C\(_2\)H\(_4\) + H\(_2\) \(\to\) C\(_2\)H\(_6\)

A. -122kJ
B. -132kJ
C. -88kJ
D. -60kJ

View Answer & Discuss (3) JAMB 2019

3705

Which of the following statements about catalyst is false?

A. biological catalysts are called enzymes
B. catalyst do not appear in the balanced equation
C. catalyst reduce the activation energy for a reaction
D. catalysts do not alter the mechanism of the reaction and never appear in the rate low

View Answer & Discuss (3) JAMB 2019

Start a Free Practice Test

Chemistry Past Questions

Subjects

Sign In