The green material is a mixture of copper hydroxide and copper carbonate formed due to reaction of copper with moist air (water, oxygen and carbon dioxide).
(i) ____________ is a metal. (ii) Metals are good ____________ of electricity.
Question
Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason.
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Fill in the blanks to complete the following paragraph. The name of the product formed in the reaction of sulphur and ___________ is sulphur dioxide gas. When sulphur dioxide is dissolved in ___________, sulphurous acid is formed. The sulphurous acid turns ___________ litmus paper to ___________. Generally oxides of ___________ are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.
Open Answer »Some of the following statements are incorrect. Find the incorrect statements and correct them. [NCERT Exemplar] a. The property of metals by virtue of which they can be drawn into wires is called ductility. b. Metals are good conductors of electricity but poor conductors of heat. c. Articles made of metals produce ringing sound when struck hard. d. Oxides of non-metals and metals are acidic in nature. e. A less reactive metal replaces a more reactive metal from its salt solution in water.
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