We know class 10 is very important class .So we provide some extra question class 10 chemistry chapter 1 important questions part -II.Solve these Test Paper of chemical reaction and improve your knowledge

Assignment II

Chapter 1: Chemical Reaction

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Q1 Which among the following are physical or chemical changes
(a) Evaporation of petrol
(b) Burning of Liquefied Petroleum Gas (LPG)
(c) Heating of an iron rod to red hot 2002
(d) Curdling of milk .
(e) Sublimation of solid ammonium chloride

Q2 . Which among the following changes are exothermic or endothermic in nature?
(a) Decomposition of ferrous sulphate
(b) Dilution of sulphuric acid
(c) Dissolution of sodium hydroxide in water
(d) Dissolution of ammonium chloride in water

Q3. . Why do we store silver chloride in dark coloured bottles? [NCERT Exemplar]

Q4. Giving an example, list two informations which make a chemical reaction more useful?[CBSE Delhi 2015]

Q5.Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why.[NCERT Exemplar]

Q6. Write the balanced chemical equations for the following reactions
(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen carbonate.
(b) Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.
(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu₂1₂), liberates iodine gas and also forms potassium sulphate.[NCERT Exemplar]

Q7.A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved. [NCERT Exemplar]

Q8 A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.
(i) Write the chemical formulae of X and Y.
(ii) Write the balanced chemical equation when X is dissolved in water.

Q9. A brown substance 'X' on heating in air forms a substance 'Y'. When hydrogen gas is passed over heated 'Y', it again changes back into 'X'.
(i) Name the substance 'X' and 'Y'.
(ii) Name the type of chemical reactions occurring during both the changes.
(iii) Write the chemical equations of the reactions.

Q10.Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat. [NCERT Exemplar]