Que. 1 What happens when -
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nail are placed in copper sulphate solution?
Que. 2 Why immersion rods for heating Liquids are made up of metallic substances.
Que. 3 Why sodium and potassium are stored in kerosene.
Que. 4 Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas
(b) Write down word equation of all the reaction taking place in this process.
Answers
Answer:
Explanation:1.(a) Copper does not react with dilute sulphuric acid. So, no reaction takes place when dilute sulphuric acid is poured on a copper plate. But when concentrated sulphuric acid is poured over copper plate, effervescence is observed. This happens because of formation of hydrogen gas.
2.Iron nails lose their shiny appearance because an insoluble layer of copper is formed on the nails, Meanwhile, the solution, C u S O 4 loses its blue color because of the formation of F e S O 4 . This reaction is called displacement reaction in which the reactive element Iron, Fe has displaced less reactive Copper from its solution,
3.Answer: Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. The immersion rod needs electric supply to get heated and; in turn; to heat liquids.
4.Add a few drops of water in the test tube containing gas. Now, cover the test tube and shake it well. After shaking, test the solution with blue litmus and red litmus. It will turn blue litmus red. Thus, the gas is acidic in nature.
Answer:
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