Consider the following statements. Which of the following statement(s) is/are true when a mixture of NaCl and K2Cr2O7 is gently warmed with concentrated H2SO4?
Question
Consider the following statements.
Which of the following statement(s) is/are true when a mixture of NaCl and K2Cr2O7 is gently warmed with concentrated H2SO4?
Solution
When a mixture of NaCl and K2Cr2O7 is gently warmed with concentrated H2SO4, the following reactions occur:
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The sodium chloride (NaCl) reacts with the sulfuric acid (H2SO4) to produce hydrochloric acid (HCl) and sodium sulfate (Na2SO4). This is a typical acid-base reaction.
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The potassium dichromate (K2Cr2O7) reacts with the sulfuric acid (H2SO4) to produce chromium trioxide (CrO3), potassium sulfate (K2SO4), and water (H2O). This is a redox reaction.
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The hydrochloric acid (HCl) produced in the first reaction then reacts with the chromium trioxide (CrO3) produced in the second reaction to produce chromyl chloride (CrO2Cl2), a reddish-brown gas, and water (H2O). This is also a redox reaction.
So, the statement that is true when a mixture of NaCl and K2Cr2O7 is gently warmed with concentrated H2SO4 is: "Chromyl chloride gas is produced."
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