An element X burns in air to form an oxide. This oxide neutralises dilute sulphuric acid to form a salt. Is X a metal or a non-metal? Open Answer »
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. Open Answer »
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain. Open Answer »
Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour? Open Answer »
If in the above figure iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer. Open Answer »
In the figure given below you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.(i) ____________ is a metal. (ii) Metals are good ____________ of electricity. Open Answer »
Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason. Open Answer »
(i) ____________ is a metal. (ii) Metals are good ____________ of electricity.