JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb145
A metal X burns in excess air to give a pale yellow solid Y, which reacts with cold water to give a base and H2O2, and with COX2 to give a carbonate and oxygen. X is sodium. Select the correct statement(s) about Y.
AY reacts with COX2 as 2Y+2COX22NaX2COX3+OX2.
BY with hot water liberates OX2 along with NaOH.
CY contains the superoxide ion and is paramagnetic.
DOne mole of Y with excess cold water gives one mole of HX2OX2.
Answer: A, B, D
Y is NaX2OX2, which contains the diamagnetic peroxide ion, so the superoxide statement is false. NaX2OX2+2HX2O2NaOH+HX2OX2 gives 1 mol HX2OX2 per mol (cold), and in hot water 2NaX2OX2+2HX2O4NaOH+OX2. The COX2 equation is also correct.