English Medium कक्षा १० - CBSE Question Bank Solutions for Science

When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.

What is meant by chemical reaction? Explain with the help of an example.

With the help of an appropriate example, justify that some of the chemical reactions are determined by Evolution of a gas.

Give chemical equation for the reaction involved in the above case.

With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in colour 

Give chemical equation for the reaction involved in the above case. 

Give one example of a chemical reaction characterised by  formation of a precipitate.

With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in temperature.

Give chemical equation for the reaction involved in the above case.

Give one example of a chemical reaction characterised by change in state.

State the various characteristics of chemical reactions.

State one characteristic of the chemical reaction which takes place when dilute hydrochloric acid is added to sodium carbonate.

State one characteristic of the chemical reaction which takes place when lemon juice is added gradually to potassium permanganate solution.

State one characteristic of the chemical reaction which takes place when dilute sulphuric acid is added to barium chloride solution.

State one characteristic of the chemical reaction which takes place when  quicklime is treated with water

State one characteristic of the chemical reaction which takes place when wax is burned in the form of a candle?

What do you understand by exothermic reactions?

What do you understand by endothermic reactions?

Give one example of an exothermic reaction.

Give one example  of an endothermic reaction.

Is Burning of natural gas an endothermic reaction or an exothermic reaction?

Is Photosynthesis an endothermic reaction or an exothermic reaction?

Is Electrolysis of water an endothermic reaction or an exothermic reaction?