Class 10 Acids, Bases and Salts Important Questions

Important Questions Notes Previous Years Questions

Acids, Bases and Salts Important Questions

1. Name the substance used in softening water.
2. Tooth enamel is the hardest substance of the body due to which substance?
3. What are alkalies? Give examples.
4. Why should curd and sour substances not be kept in brass and copper vessels?
5. You have been provided with three test tubes containing distilled water, acidic solution and a basic solution respectively. You are given only red litmus paper, how will you identify the contents of each test tube?
6. How should we dilute an acid and why?
7. Why is plaster of Paris stored in moisture proof container?
8. What are organic and mineral acids? Give two examples of each.
9. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
10. Why does dry HCl not turn blue litmus red?
11. A substance ‘X’ which is used as an antacid reacts with dil. HCl to produce a gas ‘Y’ which is used in one type of fire-extinguisher. Name the substance ‘X’ and the gas ‘Y’. Write a balanced chemical equation for the reaction involved. How will you detect the presence of this gas?
12. Metal compound A reacts with dil. HCl to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for this reaction if one of the compounds formed is calcium chloride.
13. State what happens when electricity is passed through aqueous solution of sodium chloride? Write balanced chemical equation. What is this process called? Mention one use of each product formed.
14. .
    1. Name the substance which on treatment with chlorine yields bleaching powder.
    2. Write the reaction involved.
    3. Write three uses of bleaching powder.
15. A doctor uses surgical bandages on fractured bones after making them wet.
    1. Name the substance used.
    2. Write its chemical formula.
    3. What changes are likely to occur?