Chemistry Past Questions

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3741

Which of the following sets of operation will completely separate a mixture of sodium chloride, sand and iodine?

A. addition of water, filtration, evaporation to dryness and sublimation
B. filtration, evaporation to dryness, addition of water and sublimation
C. sublimation, filtration, evaporation and addition of water
D. sublimation, addition of water, filtration and evaporation to dryness

View Answer & Discuss (11) JAMB 2019

3742

200cm\(^3\) of 0.50mol/dm\(^3\) solution of calcium hydrogen trioxocarbonate (IV) is heated. The maximum weight of solid precipitated is

A. 10g
B. 25g
C. 20g
D. 15g

View Answer & Discuss JAMB 2019

3743

Which of the following conditions will most enhance the spontaneity of a reaction?

A. \(\Delta\)H is negative and greater than T\(\Delta\)S
B. \(\Delta\)H is negative and \(\Delta\)S = 0
C. \(\Delta\)H is positive and less than T\(\Delta\)S
D. \(\Delta\)H is positive and equal to T\(\Delta\)S

View Answer & Discuss (10) JAMB 2019

3744

X is a substance which liberates CO\(_2\) on treatment with concentrated H\(_2\)SO\(_4\). A warm solution of X can decolorize acidified KMnO\(_4\). X is

A. HCOOH
B. NaHCO\(_3\)
C. FeCO\(_3\)
D. H\(_2\)C\(_2\)O\(_4\)

View Answer & Discuss JAMB 2019

3745

The velocity, V of a gas is related to its mass, M by (k = proportionality constant)

A. V = \(\frac{k}{M}\)
B. V = \(\frac{k}{M^{\frac{1}{2}}}\)
C. V = \(kM^2\)
D. V = \((\frac{k}{M})^{\frac{1}{2}}\)

View Answer & Discuss (3) JAMB 2019

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