Science
Reactivity series
धातुओं की क्रियाशीलता श्रेणी
In this Class 10 Science topic from the chapter Metals and Non-metals, students learn how metals are arranged in the reactivity series according to their tendency to lose electrons and form compounds. They compare the reactions of metals with water, acids and oxygen, and use the series to predict displacement reactions, such as when a more reactive metal displaces a less reactive metal from its salt solution. The topic also connects reactivity with metal extraction and everyday observations.
Practice questions
How does applying oil to iron mainly prevent rusting?EasyLevel 6If metal A displaces metal B from an aqueous solution of its salt, which conclusion is correct?MediumLevel 5Metal A displaces metal B from a solution of B's salt, but metal B does not displace metal A from a solution of A's salt. What is the correct conclusion?HardLevel 1A student placed an iron nail in blue copper sulphate solution and said, “Copper is more reactive than iron, so copper gets deposited on the nail.” Which is the correct correction to this statement?HardLevel 1Metal A displaces metal B and metal B displaces metal C from their salt solutions. Which is least reactive?MediumLevel 5In which of the following reactions does a more reactive metal displace a less reactive metal from its salt solution?MediumLevel 5Metal A is less reactive than metal B. What will happen if metal A is placed in an aqueous solution of a salt of metal B?MediumLevel 3Metal A displaces metal B, and metal B displaces metal C. Which metal is the least reactive?MediumLevel 4Why does copper deposit when an iron nail is placed in copper sulphate solution?MediumLevel 5Metal A displaces metal B and metal B displaces metal C from their salts. What is the correct decreasing order of reactivity?MediumLevel 5Metal A is less reactive than metal B. What happens when metal A is placed in the salt of metal B?MediumLevel 5A dilute acid gives gas with a metal, but the same acid generally gives no gas with copper. What is the main reason?MediumLevel 7Magnesium reacts faster with an acid than iron does. What does this show?MediumLevel 9Magnesium gives gas rapidly with acid while silver generally does not. What is the reason?MediumLevel 13If copper metal does not give hydrogen gas with dilute acid, what is the most correct reason?MediumLevel 14Why does copper metal generally not give hydrogen gas with dilute acids?MediumLevel 15One metal gives gas vigorously with acid while another gives no gas. What is mainly compared by this observation?MediumLevel 11Why does copper generally not liberate hydrogen from dilute hydrochloric acid?MediumLevel 12If pancreatic juice does not reach the small intestine, which conclusion is most correct?MediumLevel 23Why is sodium kept in kerosene oil?EasyLevel 1