Qualitative Analysis - Result Question 72
75. Mention the products formed in the following:
(i) Zinc oxide is treated with excess of sodium hydroxide solution.
(ii) Iodine is added to a solution of stannous chloride.
(iii) Sulphur dioxide gas, water vapour and air are passed over heated sodium chloride.
(1986, 3M)
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Solution:
(i) $ZnO+2 NaOH \longrightarrow Na _2 ZnO _2+H _2 O$
(ii) $Sn^{2+}+I _2 \longrightarrow Sn^{4+}+2 I^{-}$
(iii) $SO _2+H _2 O+\frac{1}{2} O _2+2 NaCl \longrightarrow Na _2 SO _4+2 HCl$
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