X and Y are both elements, one of which is a non-metal. 1 mole of X is added to 1 mole of Y and they are heated together. X and Y react completely to form substance Z. Substance Z cannot be easily separated to form X and Y. Three statements are given. 1 Y must be the non-metal. 2 X and Y formed a compound on heating. 3 Substance Z has the empirical formula XY. Which statements are correct?

Which molecule has the largest number of electrons involved in covalent bonds?

In which of the following is there a lattice of positive ions in a 'sea of electrons'?

Element X has the electronic structure 2,8,5. Element Y has the electronic structure 2,8,7. What is the likely formul…

A student tested a solution by adding aqueous sodium hydroxide. A precipitate was not seen because the reagent was ad…

Which statement about both chlorine atoms and chloride ions is correct?

The equation for the reaction between calcium carbonate and hydrochloric acid is shown. CaCO3(s) + 2HCl(aq) → CaCl2(a…