Jamb Chemistry Past Questions and Answers

Question 1921:

• JAMB 2017

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

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

Question 1922:

• JAMB 2017

A given mass of gas occupies 2dm³ at 300k. At what temperature will its volume be doubled, keeping the pressure constant?

A. 400k
B. 480k
C. 550k
D. 600k

Question 1923:

• JAMB 2017

The oxidation number of iodine in KIO₃ is

A. +7
B. +3
C. +5
D. +6

Question 1924:

• JAMB 2017

An isomer of C₅H₁₂ is

A. 2–ethyl butane
B. Butane
C. 2–methyl butane
D. 2–methyl propane

Question 1925:

• JAMB 2017

When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is

A. NH₃—C—C=O
B. CHO
C. CO
D. CNH₂