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B
KNO2,H2SO4
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C
KNO3,H2S
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D
KNO3,HSO3
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Solution
The correct option is AKNO3,H2SO4 The hydrogen ions of less volatile acids, like concentrated sulphuric acid, can help displace metal ions of salts of volatile acids, to produce the acid. KNO3+H2SO4→KHSO4+HNO3