Qn.

Soda water is made by dissolving carbon dioxide in water under high pressure.

1. Choose the molecular formula of soda water from the following.

[ H₂SO₄ , H₂CO₃ , H₂SO₃ , HNO₃ ]

2.What change in colour do you observe when a blue litmus paper is dipped in soda water.

3. Give reason for the colour change

a) Find the odd one out

[ Na₂O , MgO , SO₂ , Al₂O₃ ]

b)Write down the molecular formulae of the acid formed when the oxide in (a) gets dissolved in water.                

c) Write down the ionisation reaction of the acid obtained in (b) 

Molecular formulae of a few acids are given.

[ H₂SO₃ , H₂CO₃ , HNO₃ , H₂SO₄ ]

a)Find the odd one out.

b)Write down the ionisation equation of this acid.

Some water is taken in a beaker.

1. What is the pH value of water?                  

2. Some caustic soda is added to water taken in the beaker. Is there any change in the pH value of the resulting solution? Justify your answer.

Complete the table given below

Certain anions and cations are given in the box

1. Which are the cations among them?

2. Write down the molecular formula of any one of the  alkalies that can be formed from these ions .

A few acids and alkalies are given in the box)

1. Which of them is a tribasic acid ?

2. Which acid is used to produce the salt MgSO₄ ?

3. Complete the following chemical equation.

   .....A........ + HCl           NaCl + .......B......

Equations given below represent the ionisations of two acids. Complete the equations.

H₂CO₃ .          .....P....... + CO₃^2-

HNO₃                H⁺ + ......Q.......

a)What are P and Q

b)Which one of them is a monobasic acid?

Given below are equations of the reactions taking place when hydrochloric acid dissolves in water.

HCl H⁺ + Cl ^-

H⁺ + H₂O     ......A.......

1. What is A in this equation?   

2. The following equations show the ionisation of H₂SO_4. Complete the equation.

H₂SO₄             H⁺ + ......B.......                        

B         H⁺ + ......C......                       

Qn.

Classify the following into acidic oxides and basic oxides.

Given below is the equation of reaction between calcium oxide and water

CaO + H₂O            ........A.........

1. Identify the product A.

2. What is the nature of A? Suggest a method to identify A.

Procedure of an experiment is given below

Take some calcium carbonate in a boiling tube. Add hydrochloric acid to it using a thistle funnel. The gas coming out is passed through water containing blue litmus solution

1. Name the gas evolved ?

2. Suggest a method to identify this gas

3. What changes takes place when this gas is passed through water containing blue litmus solution . Give reason

Choose the statements suitable for acids

1. Have alkaline taste.

2. Turns red litmus blue

3. Turns blue litmus red

4. Have sour taste

pH values of a few substances are given in the table given below. Answer the following questions

1. Which one of them shows neutral nature ?

2. Which substance among them usually react with metals to produce hydrogen gas?

3. Name a product formed when B and C combine

4. Identify the gas formed when the substance C reacts with carbonates ?

pH Value of substances P,Q and R are given in the table. Answer the following questions.

1. Which substance is acidic in nature ?

2. Which one of them turns red litmus blue?

3. What happens to the concentration of H+ ions on increasing pH value?

4. What is the nature of substance R ?

The equation of a neutralisation reaction is given below..

Ca(OH)₂ + H₂SO₄           CaSO₄ + 2H₂O

1. Identify the alkali in this reaction?

2. Write down the chemical equation of the reaction between Mg(OH)₂ and HCl

3. Which is the product formed when the common components of an acid combines with the common component of an alkali ?

Given below is the equation of a chemical reaction between an acid and an alkali.

Na⁺OH^- + H⁺Cl^-        NaCl + H₂O

1. Which is the salt formed in this reaction?

2. What is such type of reactions commonly known as ?

3. Name the salt formed when H₂SO₄ is used instead of HCl?

4. Write down the chemical equation of this reaction.

Match the columns suitably