1 Marks Question
- Define neutral salt.
- The salt formed by the complete displacement of hydrogen from acids is called neutral salt.
- Write two examples of weak acids.
- Two examples of weak acids are H2CO3, CH3COOH.
- What is an acid?
- An acid is a chemical substance which is sour in taste and gives hydrogen ions when dissolved in water.
- What is pH paper?
- pH paper is a paper stained with litmus which is used to indicate the acidity or alkalinity of a substance. It is also called litmus paper.
- What is universal indicator?
- A universal indicator is a mixture of simple indicators which is used for identifying the acidic and basic nature of substances.
- What is salt? Write its two examples.
- Salts is a chemical substance which is formed by partial or complete replacement of hydrogen atom by metal or any other positive radical. For example, NaCl, CuSO4 etc.
- Write any two methods of preparation of salt.
Methods of preparation of salt are:
- It can be prepared from a reaction between an acid and a metal.
- It can be prepared from a reaction between an acid and a base or a carbonate.
- What is a neutralization reaction?
The reaction in which acid and base react together to form neutral salt and
water is called a neutralization reaction.
H2SO4 + CaO ⟶ CaSO4 + H2O
- Write down any two properties of base.
Properties of base are:
More info: Bases lose their basicity when mixed with acids, They reacts with acid to form salt and water, They can conduct electricity.
- Bases change the color of litmus from red to blue.
- They are bitter in taste and soapy in touch.
- What is the pH value of the products of acid base reaction and why?
- The pH value of the products of the acid-base reaction is 7 because salt and water are formed.
- Write any two methods to test alkali.
Methods to test alkali are:
- Red litmus when dipped into alkali solution turns into blue color.
- Oil or grease like substances dissolve in alkali.
- What is the pH value of neutral water?
- The pH value of neutral water is 7.