# Chemical reactions and equations class 10 worksheet

In this page we have chemical reactions and equations class 10 worksheet with answers . Hope you like them and do not forget to like and share the page.

## Fill in the blanks:-

1.Addition of hydrogen in a substance in a reaction is known as___________ reaction.
2.In a ________ reaction two or more substances combine to form a new single substance.
3.Unbalanced reactions are also known as _________
4.Reactions in which heat is given out along with the products are called _________- reactions.
5.Reactions in which energy is absorbed are known as _________ reactions.
6.When as element displaces another element from its compound, a ________ reaction occurs.
7.Those reactions, in which two compounds react by an exchange of ions to form two new compounds, are called ________ reactions
8.Precipitation reactions produce __________ salts.
9.Reduction is the _________ of oxygen or gain of hydrogen.
10.The digestion of food in the body is an example of ____________ reaction.
11.The addition of oxygen to a substance is called __________.
12.When calcium carbonate is heated, it decomposes to give___________ and _________.

## True/ False:-

1.The number of atoms of each element is conserved in any chemical reaction.
2.Oxidation is the loss of electrons from a substance.
3.Reduction is the gain of electrons by a substance.
4.A complete chemical equation represents the reactants, products and their physical states symbolically.
5.A magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, magnesium oxide.
6.Rusting is a double decomposition reaction.
7.The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction.
8.Action of heat on ferrous sulphate is an example of decomposition reaction.
9.The formation of Na+ and CI- ions from sodium and chlorine is an example of a redox reaction.

Question 1. Write a chemical equation when magnesium metal reacts with aqueous hydrochloric acid to produce a solution of magnesium chloride and hydrogen gas.
Question 2. Can a combination reaction be redox reaction.
Question 3. Why do we apply paint on iron articles?
Question 4. What are the different types of reactions?
Question 5. What is a decomposition reaction ? Give example.
Question 6. Define displacement reaction.
Question 7. What happens when sodium reacts with water?
Question 8. Write the chemical equation and name the reaction when a solution of sodium chloride is mixed with a solution of silver nitrate and a white precipitate of silver chloride is formed.
Question 9. Why does the color of copper sulphate solution change, when an iron nail is dipped in it?
Question 10. Why is photosynthesis considered as an endothermic reaction?
Question 11. Potassium chlorate (KCIO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction.
Question 12. Give an example of a chemical reaction characterized the change in temperature.
Question 13. What type of chemical reactions take place when:
(a)Limestone is heating?
(b)A magnesium wire is burnt in air?
(c)Electricity is passed through water?
(d)Ammonia and hydrogen chloride are mixed?
(e)Silver bromide is exposed to sunlight?
Question 14. To balance a chemical equation, can we change the formula of either reactants or products?
Question 15. Why should a magnesium ribbon be cleaned before burning in air?
Question 16. If an of the following reactions occurs spontaneously, write the balanced net ionic equation. If not, write no reaction&
(a)Pb + Zn2+ _____ Pb2+ + Zn
(b)Fe + H+ _____Fe2+ + H2
(c)Cu + Ag+ _____ Cu2+ + Ag
(d)Cr + Zn2+ _____Cr2+ + Zn
Question 17. Nickel (II) nitrate is prepared by heating nickel metal with liquid dinitrogen tetroxide. In addition to the nitrate, gaseous nitrogen monoxide is formed. Write the balanced equation.
Question 18. Why is the amount of gas collected in one of the test tubes in electrolysis of water double of the amount collected in the other? Name this gas.
Question 19. Write a balanced chemical equation with state symbols for the following reactions:-
i.Solution of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
ii.Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.

Given below are the links of some of the reference books for class 10 Science.

You can use above books for extra knowledge and practicing different questions.

### Practice Question

Question 1 Which among the following is not a base?
A) NaOH
B) $NH_4OH$
C) $C_2H_5OH$
D) KOH
Question 2 What is the minimum resistance which can be made using five resistors each of 1/2 Ohm?
A) 1/10 Ohm
B) 1/25 ohm
C) 10 ohm
D) 2 ohm
Question 3 Which of the following statement is incorrect? ?
A) For every hormone there is a gene
B) For production of every enzyme there is a gene
C) For every molecule of fat there is a gene
D) For every protein there is a gene

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