Chemistry Past Questions and Answers

Which of the following substances is a basic salt?

Which of the following acts both s a reducing and an oxidizing agent?

Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?

A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K<sub style='font-size: smaller;'>2</sub>Cr<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>7</sub> solutions, a blue-black colour was produced. In this reaction, the?

Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na<sub style='font-size: smaller;'>2</sub>S<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>3(aq)</sub> + 2HCl<sub style='font-size: smaller;'>(aq)</sub> → 2NaCI<sub style='font-size: smaller;'>(aq)</sub> + H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(I)</sub> + SO<sub style='font-size: smaller;'>2(g)</sub> + S<sub style='font-size: smaller;'>(g)</sub>?