2011 OAU Chemistry Post-UTME

What condition favours the formation of the product for the endothermic reaction,

${\mathrm{N}}_2{\mathrm{O}}_{4\left(\mathrm{g}\right)} \to 2{\mathrm{NO}}_{2\left(\mathrm{g}\right)}$

What is the percentage yield of water if 0.90g of water is obtained when 29.0g of butane is burned in excess oxygen?

The order of reactivity of five metals is P > Q > R > S > T. Which of the following reactions can occur spontaneously?

T + P⁺ → T⁺ + P

An element, Y has the electronic configuration of

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^3$

Which of the following is NOT implicated as a major cause of global warming?

Which of the following shows little or no net reaction when the volume of the system is decreased?

A solution of 0.20 mole of NaBr and 0.20 mole of MgBr₂ in 2.0 dm³ of water is to be analysed. How many moles of Pb(NO₃)₂ must be added to precipitate all the bromide as insoluble PbBr₂

A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [C = 12, H = 1, S = 32, O = 16].

The reaction, A + B → C can be represented by the equations, r = k[A][B]

k in the equation is,

The reaction that takes place in Daniel cell is

Which of the following is composed of the elements, H, O, Al, and Si?

Which of the following is not a chemical reaction?

100.0g of KClO₃ was added to 40.0 cm₃ of water to give a saturated solution at 298K. If the solubility of the salt is 20.0 mol dm ^-3 at 298K, what percentage of the salt is left undissolved? [K = 39, Cl = 35.5, O = 16]

A tertiary amine is

Which of the following statements is true when sulphur atom forms its ion?

An electron described by the quantum number, n = 4, L = 3 can be located in what orbital?

An aqueous solution of a crystalline salt reacts with dilute HCl to give a yellow precipitate and a gas that turned dichromate paper green. The crystalline salt may be

The oxidation states of nitrogen in ammonium nitrate are

Which of these reagents can confirm the presence of a triple bond?

An excess 0.10 mol dm^-3 HCl was poured into a big beaker containing 2g of limestone. The unreacted acid required 25cm³ of 0.10mol dm^-3 potassium carbonate to neutralize it. What was the original volume of the acid?

[Ca = 40, C = 12, O = 16]

${\mathrm{R}}_{88}^{226} \to {\mathrm{Rn}}_{86}^{\mathrm{X}} + \mathrm{\alpha } – \mathrm{particle}$

What is the value of x in the nuclear reaction

In the electrolysis of copper (II) sulphate using copper electrodes, the processes that occur at the anode and cathode respectively are