(a) A zinc salt, E when heated strongly, produced a brown gas with pungent smell, a colourless gas that rekindled a glowing splint, and a residue that was allowed to cool.
(i) identify the salt E.
(ii) Write an equation for the decomposition of E.
(iii) State what would be observed when the residue was allowed to cool.
(b) Describe how 250cm\(^3\) of 0.2 mol dm\(^3\) H\(_2\)SO\(_4\) could be prepared from 150 cm\(^3\) of a 1.0 mol dm\(^{3}\) stock solution of the acid.
(c) State the effect of aqueous solution of Al\(_2(SO_4)_3\) on litmus paper.
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The equation written is not complete and this makes the answer quite confusing.
2Zn(NO3)² → 2ZnO + 4NO² + O²
So O² is the gas that rekindles the glowing splint while NO² is the gas with a pungent smell.
Please note that the superscripts in my equation are meant to be at the subscript position. Meaning the ² in 'O²' is meant to be below.