Class 10 Acids, Bases and Salts Important QuestionsImportant Questions Notes Previous Years Questions
Acids, Bases and Salts Important Questions
- Name the substance used in softening water.
- Tooth enamel is the hardest substance of the body due to which substance?
- What are alkalies? Give examples.
- Why should curd and sour substances not be kept in brass and copper vessels?
- 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?
- How should we dilute an acid and why?
- Why is plaster of Paris stored in moisture proof container?
- What are organic and mineral acids? Give two examples of each.
- 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?
- Why does dry HCl not turn blue litmus red?
- 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?
- 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.
- 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.
- Name the substance which on treatment with chlorine yields bleaching powder.
- Write the reaction involved.
- Write three uses of bleaching powder.
- A doctor uses surgical bandages on fractured bones after making them wet.
- Name the substance used.
- Write its chemical formula.
- What changes are likely to occur?