Some Basic Concepts of Chemistry - Result Question 91
####29. Among the following, the number of elements showing only one non-zero oxidation state is $O, Cl, F, N, P, Sn, Tl, Na, Ti$
(2010)
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Solution:
- The balanced chemical reaction of zinc with sulphuric acid and $NaOH$ are
$$ Zn+H _2 SO _4 \longrightarrow ZnSO _4+H _2(g) \uparrow $$
$Zn+2 NaOH+2 H _2 O \longrightarrow Na _2\left[Zn(OH) _4\right]+H _2(g) \uparrow$
Since, one mole of $H _2(g)$ is produced per mole of zinc with both sulphuric acid and $NaOH$ respectively, hydrogen gas is produced in the molar ratio of 1:1 in the above reactions.
