MCQ

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Cards (4)

  • When Sodium bicarbonate reacts with dilute HCI carbon dioxide gas is evolved. The evolved carbon dioxide gas turns lime water milky.
  • Na2HCO3 +2HCl —> 2Nacl + H2O+ CO2
  • The name of the salt used to remove the permanent hardness of water is; Washing soda (Sodium carbonate decahydrate, Na2CO3.10H20 )
  • When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction involved is : 2KI+2KI +Pb(NO3)2−−−>PbI2+ Pb(NO3)2 ---> PbI2 +2KNO3 2KNO3