Question : Copper substances when exposed to air, gain a green coating due to the formation of:
Option 1: CuO
Option 2: CuCO3.Cu(OH)2
Option 3: CuSO4
Option 4: Cu(NO3)2
Correct Answer: CuCO3.Cu(OH)2
Solution : The correct option is CuCO3.Cu(OH)2.
Copper turns green when it comes into contact with air because copper carbonate forms. This covering that has a greenish hue is called "patina." Carbon dioxide, oxygen from the air, and copper combine to produce it. This patina mostly consists of copper carbonate, which can include copper (II) carbonate (CuCO3) as well as basic copper carbonate (CuCO3. Cu(OH)2).
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Question : What is the correct formula for calcium hydroxide?
Option 1: CaOH
Option 2: Ca(OH)4
Option 3: Ca(AlOH)4
Option 4: Ca(OH)2
Question : In which of the following ions, the colour is not due to d-d transition?
Option 1: [Ti(H2O)6]+3
Option 2: CoF63−
Option 3: MnO4−
Option 4: [Cu(NH3)4]2+
Question : What is the name of the 1,3-isomer (or meta-isomer) of benzenediol with the chemical formula C6H4(OH)2?
Option 1: m-Cresol
Option 2: Resorcinol
Option 3: Catechol
Option 4: Glycerol
Question : Which of the following is not a neutral oxide?
Option 1: N2O
Option 2: Na2O
Option 3: NO
Option 4: CO
Question : Which of the following is the formula of barium peroxide?
Option 1: Ba2O2
Option 2: BaSO4
Option 3: BaO
Option 4: BaO2
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