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प्रश्न
Describe with chemical equations, what happens when K2Cr2O7 reacts with sodium chloride in the presence of conc. H2SO4.
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लघु उत्तर
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उत्तर
When potassium dichromate (K2Cr2O7) reacts with sodium chloride (NaCl) in the presence of concentrated sulphuric acid (H2SO4), chlorine gas (Cl2) is liberated. This is a redox reaction where \[\ce{Cr2O^{2-}_7}\] (from K2Cr2O7) acts as an oxidising agent, converting Cl− ions into Cl2 gas.
\[\ce{K2Cr2O7 + 4NaCl + 6H2SO4 -> 2KHSO4 + 2Cr(SO4)3 + 4NaHSO4 + 3Cl2 + 3H2O}\]
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