The densities of two gases, X and Y, are 0.5 g dm-3 and 2.0 dm-3 respectively. What is the rate of diffusion of X relative to Y?

In an electrolytic set-up to protect iron from corrosion, the iron is?

When sodium ethanoate is treated with a few drops of concentrated tetraoxosulphate(vi)acid. one of the products is

Which of the following is NOT true of metals?

One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?

Which of the following reagents will confirm the presence of unsaturation in a compound?

\( \mathrm{MnO_4(aq) + 8H + 5Fe^{2+} \rightarrow Mn^{2+}(aq) + 5Fe^{3+}(aq) + H_2O} \). The oxidation number of maganese in the above reaction changed from

The general formula of alkanoates is?

Which of the following is the correct order of decreasing activity of the metals Fe, Ca, Al and Na?