1. Chemical Reaction and Storage Question:

Can we store zinc sulphate solution in a copper vessel? Why or why not?

2. Balancing Chemical Equations:

Balance the equation for the reaction between sodium hydroxide and sulphuric acid to form sodium sulphate and water.

Unbalanced Equation:
[tex]\[
\text{NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
\][/tex]

3. Whitewashing Compound:

Which compound is used for white washing? Write the reactions involved in the preparation of the material and after application of the material on the wall.

4. Respiration Reaction:

Is respiration an exothermic or an endothermic reaction? Explain.

5. Coin Reaction:

A shiny brown coin made up of an element turned black on heating. What was the element of the coin and what is the black compound formed?

6. Electrolysis of Water:

Why is the amount of gas collected in one of the test tubes double of the amount collected in the other on electrolysis of water? Name this gas.

7. Iron and Copper Sulphate Reaction:

An iron rod kept in copper sulphate solution turned brown after some time. Explain why. What other change will you observe?

8. Copper Vessel in Rainy Season:

Why is a greenish deposit found on copper vessels in the rainy season?

9. Packaging of Potato Chips:

Why do potato chips manufacturers fill the packet of chips with nitrogen gas?

10. Oxidation and Reduction:

Taking a suitable example, explain that oxidation and reduction take place side by side.

11. Balancing Chemical Equations:

Balance the following chemical equation:
[tex]\[ \text{Barium chloride} + \text{Aluminium sulphate} \rightarrow \text{Barium sulphate} + \text{Aluminium chloride} \][/tex]

Type of Reaction:

12. Potassium Bromide and Barium Iodide Reaction:

Balance the chemical equation for the reaction between potassium bromide and barium iodide. Name the type of reaction.

Unbalanced Equation:
[tex]\[ \text{KBr} + \text{BaI}_2 \rightarrow \text{BaBr}_2 + \text{KI} \][/tex]

13. Photosynthesis in Plants:

Write the balanced chemical equation for photosynthesis in plants along with conditions, if any.

Equation:
[tex]\[ 6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow{\text{light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \][/tex]

14. Displacement vs. Double Displacement:

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Displacement Reaction Example:
[tex]\[ \text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu} \][/tex]

Double Displacement Reaction Example:
[tex]\[ \text{Na}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 + 2\text{NaCl} \][/tex]