Question

please give atleast 10 important questions from chemical reaction and equation (no answers like --refer google)please help me out guys​

Answer 1

Step-by-step explanation:

1. (a) Write one example for each of decomposion reaction carried out with help of

(i) Electricity (ii) Heat (iii) Light

(b) Which of the following statements is correct and why copper can displace silver from silver nitrate and silver can displace copper from copper sulphate solution.

2. (a) Define a balanced chemical equation. Why should an equation be balanced?

(b) Write the balanced chemical equation for the following reaction:

(i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride.

(ii) Burning of natural gas.

(iii) The process of respiration.

3. State the type of chemical reactions and chemical equations that take place in the following:

(i) Magnesium wire is burnt in air.

(ii) Electric current is passed through water.

(iii) Ammonia and hydrogen chloride gases’are mixed.

4. 2g of ferrous sulphate crystals are heated in a dry boiling tube.

(i) List any two observations.

(ii) Name the type of chemical reaction taking place.

(iii) ‘Write the chemical equation for the reaction.

5. Name the reducing agent in the following reaction:

3MnO2 + 4Al———— > 3Mn + 2Al2O3

State which is more reactive, Mn or A1 and why?

6. Identify the type of reaction(s) in the following equations.

(i) CH4 + 2O2 CO2 + 2 H2O

(ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs

(iii) CaO + H2O ——–> Ca(OH)2

(iv) CuSO4 + Zn ——–> ZnSO4 + Cu

7. What is the colour of ferrous sulphate crystals? How does this colour change after heating?

8. What is rancidity? Mention any two ways by which rancidity can be prevented.

9. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction?

10. Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire. Why?