English Medium कक्षा १० - CBSE Question Bank Solutions for Science

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

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

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

What is meant by strong acids?

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

Why do HCl, H₂SO₄, HNO₃, etc., show acidic character in aqueous solutions while solutions of compounds like C₆H₁₂O₆ (glucose) and C₂H₅OH (alcohol) do not show acidic character?

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 the 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 is produced if an acid is added to a base?

What do you understand by endothermic reactions?

Give one example of an exothermic reaction.

Give one example of an endothermic reaction.

Which of the following are endothermic reactions and which are exothermic reactions?

1. Burning of natural gas
2. Photosynthesis
3. Electrolysis of water
4. Respiration
5. Decomposition of calcium carbonate

One of the following does not happen during a chemical reaction. This is:

Which of the following does not involve a chemical reaction?