Class - X (Chemistry)
(Chemical Reactions & Equations )

Q.1 Why should magnesium ribbon be cleaned before burning in air?

Q.2 Write a balanced chemical equation with state symbols for the following chemical reaction.

•  Solution of barium chloride and sodium sulphate in water to give insoluble barium sulphate and the solution of sodium chloride.

•  Aqueous solution of sodium hydroxide reacts with hydro chloric acid solution to produce sodium chloride solution and water.

Q.3 What happens when slowly water is added into the calcium oxide or quicklime. Give reaction.

Q.4 When a crystal of green coloured ferrous sulphate is heated, it becomes colourless. Why ? (Give chemical reaction).

Q.5 Is the volume of gases collected by the electrolysis of water would be same, If not, Why ?

Q.6 Why white coloured silver choloride changes to grey on exposure to sunlight ?

Q.7 Why does the colour of copper suphate solution change when an iron nail is dipped in it ?

Q.8 Identify the substance that are oxidized and the substance that are reduced in the following reaction

a) 4 Na + O2 -----------------> 2 Na 2 O

b) Cuo + H2 -------------------> Cu + H2 O (L)

Q.9 What is a balanced chemical equation ? Why should the chemical equation be balanced ?

Q.10 Translate the following reactions into chemical equations & then balance them:-

a) Hydrogen sulphate gas burns in air to give water and sulphur dioxide.

b) Barium chloride reacts with Aluminum sulphate to give Aluminum chloride and precipitate of Barium sulphate.

c) Potassium metal reacts with water to give Potassium hydroxide and hydrogen

Q.11 Balance the following chemical equation :-

a) HNO3 +Ca (OH)2 ---------------> Ca (NO3)2 + H2O

b) NaOH + H2SO4 ---------------->- Na2SO4 + H2O

Q.12 Write the balanced chemical equations for the following :-

a) Calcium hydroxide + carbon dioxide ----->- Calcium carbonate + water

b) Zinc + Silver Nitrate ---------->- Zinc Nitrate + Silver

c) Aluminum + Copper Chloride --------> Aluminium chloride + copper

d) Barium chloride + Potassium sulphate ------ > Barrium sulphate + Potassium chloride

Q.13 What does one mean by exothermic and endothermic reactions ? Give examples.

Q.14 Why is respiration considered an exothermic reaction ?

Q.15 Why are decomposition reactions called the opposite of combination reactions ? Write equations for these reactions.

Q.16 What is the differences between displacement and double displacement reactions? Write equations for these reactions.

Q.17 Write the reaction involved in the recovery of silver from silver Nitrate solution by copper metal.

Q.18 What do you mean precipitation reaction ? Explain giving examples.

Q.19 Explain the following in terms of gain or loss of oxygen with two examples each.

a) Oxidation b) Reduction

Q.20 A shiny brown coloured element ‘X' on heating in air becomes black in colour. Name the element ‘X' and the black coloured compound formed.

Q.21 Differentiate between corrosion and rusting.

Q.22 What is the chemical formula of Rust ?

Q.23 Why do we apply paint on iron articles ?

Q.24 What is Rancidity ? Why oil and fat containing food items are flushed with nitrogen ?

Q.25 Why does milk become sour if kept exposed to air for long time ?

Q.26 What type of reaction is represented by the digestion of food in our body ?

Q.27 What happens when calcium carbonate is heated strongly ?

Q.28 Give one important use of decomposition reaction.

Q.29 Explain the terms oxidising and reducing agents with examples.

Q.30 Balance the following :-

a) Mg (OH)2 + HCI --------- Mgcl2 + H2O

b) NH3 + CuO --------- Cu + N2 + H2O

c) Al2 (SO4)3 + NaOH ------- Al (OH)3 +Na2 SO4

Q.31 Identify the following process into various chemical reactions :-

a) A magnesium wire is burnt in air

b) Limestone is heated.

c) Proteins are converted into amino acids.

d) Electricity is passed through water.

e) Ammonia and hydrogen chloride are mixed.

f) Carbon monoxide reacts with oxygen to form carbon dioxide.

g) Iron fillings are placed into the blue colour copper suphate solution.

Q.31 Explain double displacement reaction with few examples.


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