English Medium Class 10 - CBSE Question Bank Solutions for Science

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?

Is Respiration an endothermic reaction or an exothermic reaction?

Is Decomposition of calcium carbonate an endothermic reaction or an exothermic reaction?

One of the following does not happen during a chemical reaction. This is:
(a) Breaking of old chemical bonds and formation of new chemical bonds
(b) Formation of new substances with entirely different properties
(c) Atoms of one element change into those of another element to form new products.
(d) A rearrangement of atoms takes place to form new products.

Which of the following does not involve a chemical reaction?

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of:
(a) potassium chloride
(b) potassium nitride
(c) potassium sulphide
(d) potassium iodide

An acid which can decolourise purple coloured potassium permanganate solution is:
(a) sulphuric acid
(b) citric acid
(c) carbonic acid
(d) hydrochloric acid