Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?
2HCl + CaCO\(_3\) → CaCl\(_2\) + H\(_2\)O + CO\(_2\)
- A. Increasing the concentration of the acid
- B. Increasing the surface area of CaCO\(_3\)
- C. A and B
- D. Reducing the concentration of the acid
The part of the total energy of a system that accounts for the useful work done in a system is known as
- A. Enthalpy change
- B. None of the above
- C. Gibb's free energy
- D. Entropy
When the end alkyl groups of ethyl ethanoate are interchanged, the compound formed is
- A. propylmethanoate
- B. ethylpropanoate
- C. methyl ethanoate
- D. methyl propanoate
An element Z contains 80% of \(^{16} _8\)Z and 20% of \(^{18} _8\)Z. Its relative atomic mass is
- A. 16.2
- B. 17.6
- C. 16.0
- D. 16.4
How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?
- A. none
- B. 6
- C. 7
- D. 8
A solution X, on mixing with AgNO\(_3\) solution gives a white precipitate soluble in aqueous NH\(_3\), a solution Y, when also added to X, also gives a white precipitate which is soluble when heated solutions X and Y respectively contain
- A. Al\(^{3+}\), Cl\(^-\)
- B. Hg\(^+\), SO\(_4 ^{2-}\)
- C. Pb\(^{2+}\), Cl\(^-\)
- D. Ag\(^+\), SO\(_4 ^{2-}\)
The reaction \(2H_2 S + SO_2 \to 3S + 2H_2 O\) is
- A. not a redox reaction because there is no oxidant in the reaction
- B. not a redox reaction because there is no reductant in the reaction
- C. a redox reaction in which H\(_2\)S is the oxidant and SO\(_2\) is the reductant
- D. a redox reaction in which SO\(_2\) is the oxidant and H\(_2\)S is the reductant
How many alkoxyalkanes can be obtained from the molecular formula C\(_4\)H\(_{10}\)O?
- A. 4
- B. 2
- C. 1
- D. 3
The cost of discharging 6.0g of a divalent metal, X from its salt is ₦12.00. What is the cost of discharging 9.0g of a trivalent metal, Y from its salt under the same condition?
[X = 63, Y = 27, 1F = 96,500C]
- A. N12.00
- B. N27.00
- C. N63.00
- D. N95.00
If the cost of electricity required to discharge 10g of an ion X\(^{3+}\) is N20.00, how much would it cost to discharge 6g of ion Y\(^{2+}\)?
[1 faraday = 96,500C, atomic masses are X = 27, Y = 24]
- A. N10.00
- B. N6.00
- C. N20.00
- D. N9.00
Hydrogen diffused through a porous plug
- A. thrice as fast as oxygen
- B. at the same speed as oxygen
- C. four times as fast as oxygen
- D. twice as fast as oxygen
The emission of two successive beta particles from the nucleus \(^{32} _{15} P\) will produce
- A. \(^{30} _{14}\)Si
- B. \(^{32} _{13}\)Al
- C. \(^{32} _{17}\)Cl
- D. \(^{32} _{16}\)S
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 = \((\frac{k}{M})^{\frac{1}{2}}\)
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\(_4\)
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
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
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
Methane is prepared in the laboratory by heating a mixture of sodium ethanoate with soda lime. The chemical constituent(s) of soda lime is/are
- A. Ca(OH)\(_2\) and NaOH
- B. Na\(_2\)CO\(_3\)
- C. NaCl
- D. NaOH
Hydrogen bond is a sort of
- A. van der waals force
- B. dative bond
- C. ionic bond
- D. a covalent bond
The oxidation state(s) of nitrogen in ammonium nitrite is/are
- A. -3, +3
- B. +5
- C. -3, +5
- D. -3
Which quantum divides shells into orbitals?
- A. Spin
- B. Principal
- C. Azimuthal
- D. Magnetic