JAMB UTME - Chemistry - 1990

Equal volumes of CO,SO2, and H2S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?

(S = 32, C = 12, O = 16, N = 14, H = 1)

.....................P....Q.....R......S

Proton..............13....16....17.....19

Electron............13....16....17.....19

Neutron.............14....16....35.....20Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?

\[ \mathrm{Fe_2O_{3(s)} + 2Al_{(s)} \rightarrow Al_2O_3 + 2Fe_{(s)}} \]

If the heats of formation of \( \mathrm{Al_2O_3} \) and \( \mathrm{Fe_2O_3} \) are - 1670 kj mol\(^{-1}\) and - 822 kj mol\(^{-1}\) respectively, the enthalpy change in kj for the reaction is ?

Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5.
The relative abundance of the isotope of mass number 37 is?

10.0 dm3 of air containing H2S as an impurity was passed through a solution of Pb(NO3)2 until all the H2S had reacted. The precipitate of PbS was found to weigh 5.02 g. According to the equation: Pb(NO3)2 + H2S → PbS + 2HNO3 the percentage by volume of hydrogen sulphide in the air is?

(Pb = 207, S = 32, GMV at s.t.p = 22.4dm3)

Use the above graph above to answer this question . \(\mathrm{CH_3-C=CH}\ \xrightarrow{\frac{\mathrm{Na}}{\mathrm{liqNH_3}}}\ \mathrm{P}\), Compound P, in the above reaction, is

Changes in the physical in the scheme above.The letter X,Y and Z respectively represent

In a reaction: SnO + 2C → Sn + 2CO, the mass of coke containing 80% carbon required to reduce 0.302 kg of pure tin oxide is?

(Sn - 119, O - 16, C - 12).

What is the IUPAC name for the hydrocarbon?

The above reaction is an example of

In the reaction:

2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;

The concentration of iodine in the equilibrium mixture can be increased by?

0.1 faraday of electricity deposited 2.95 g of nickel during electrolysis of an aqueous solution.

Calculate the number of moles of nickel that will be deposited by 0.4 faraday? (Ni = 58.7)

The solubility in mol dm-3 of 20g of CuSO4 dissolved in 100g of water at 180o is

[Cu = 64, S = 32, O =16]

Use the graph above to answer this question. The structure of cis-2-butene is

Select the right answer from the structure above.Which of the following compounds represents the polymerization product of ethyne?