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ChemistryClass 10ICSE

A strip of metal X is dipped in a blue coloured salt solution YSO4. After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z. (a) What could metal X be? (b) What could metal Y be? (c) Name the metal salt YSO4 (d) What type of chemical reaction takes place when metal X reacts with salt solution YSO4? Write the equation of the chemical reaction involved. Name the alloy Z.

Metal X is Zinc (Zn) Metal Y is Copper (Cu) Copper sulphate (CuSO4) is named as YSO4 Displacement reaction;Displacement reaction is a reaction in which one active element displaces a less reactive element from its salt solution CuSO4 (aq) + Zn (s) → ZnSO4 (aq) + Cu (s) Brass

ChemistryClass 10ICSE

When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place? (a) In the first case? In the second case?

Combination reaction of hydrogen and oxygen gas which results in the formation of water Decomposition reaction is that water electrolysis which breakdown hydrogen gas and oxygen gas

ChemistryClass 10ICSE

A colourless lead salt, when heated, produces a yellow residue and brown fumes. (a) Name the lead salt. (b) Name the brown fumes. (c) Write a chemical equation of the reaction involved.

Lead nitrate is the lead salt Nitrogen dioxide is responsible for the brown fumes 2Pb(NO3)2→ 2PbO + 4NO2

ChemistryClass 10ICSE

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out. (a) Name the iron salt. (b) Name the type of reaction that takes place during the heating of iron salt. Write a chemical equation for the reaction involved.

Ferrous Decomposition Ferrous sulphate crystal loses water and forms anhydrous ferrous sulphate and further decomposes to form ferric oxide, sulphur dioxide and sulphur trioxide 2FeSO4→ Fe2O3 + SO2+ SO3

ChemistryClass 10ICSE

(a)  Decomposition reaction as well as displacement reaction(a) Combination reaction as well as double displacement reaction (b) Redox reaction as well as displacement reaction (c) Double displacement reaction as well as Redox reaction

Option(c) is the answer. Redox reaction as well as displacement reaction takes place because magnesium get oxidized here and copper reduces. Therefore it is reduction and magnesium displaces copper in the solution as being more reactive. Thus becomes displacement reaction

ChemistryClass 10ICSE

Consider the reaction: KBr (aq) + AgNO3 (aq) → KNO3 (aq) + AgBr (s) This is an example of: (a) Decomposition reaction (b) Combination reaction (c) Double displacement reaction Displacement reaction

Option (c) is the answer. Double displacement reaction is the given reaction that is exchange of ions takes place between both the reactants. You are given the following chemical equation: Mg(s) + CuO(s) →MgO(s) + Cu (s)

ChemistryClass 10ICSE

Which of the following can be decomposed by the action of light? (a) NaCl (b) KCl (c)AgCl (d) CuCl

Option (c) is the answer. Here AgCl is decomposed by the action of light. The reaction which reactants split into simpler products is called decomposition reaction so here silver chloride can be decomposed by the action of light.

ChemistryClass 10ICSE

The process of respiration is: (a) An oxidation reaction which is endothermic (b) A reduction reaction which is exothermic (c) A combination reaction which is endothermic An oxidation reaction which is exothermic

Option (d) is the answer. During digestion the food what we have taken breakdown and gives energy. If we are having carbohydrate content food items, it break downs to glucose and it combines with oxygen to give energy and thus addition of oxygen takes place and energy is also released

ChemistryClass 10ICSE

Consider the following equation of the chemical reaction of a metal M: 4M + 3O2→ 2M2O3 The equation represents: (a) Combination reaction as well as reduction reaction (b) Decomposition reaction as well as oxidation reaction (c) Oxidation reaction as well as displacement reaction Combination reaction as well as oxidation reaction

Option (d) is the answer. In the above reaction, Metal combines with the oxygen to form a single compound which is a combination reaction and here addition of oxygen takes place so it is oxidation reaction

ChemistryClass 10ICSE

A white precipitate will be obtained if we add common salt solution to: (a) Ba(NO3)2solution (b) KNO3 solution (c)AgNO3solution (d) Mg(NO3)2 solution

Option (c) is the answer. A white precipitate is formed when we add common salt to silver nitrate which is a precipitation reaction.

ChemistryClass 10ICSE

A white precipitate can be obtained by adding sulphuric acid to: (a) CuSO4 solution (b) NaCl solution (c) BaCl2 solution Na2SO4 solution

Option (c) is the answer. When dilute sulphuric acid reacts with the barium chloride then the barium sulphate is formed as a product with hydrochloric gas and thus formed barium sulphate will be white precipitate which is insoluble.

ChemistryClass 10ICSE

In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of: (a) Cl2 (b)H2 (c)N2 (d) O2

Option (c) is the answer. If food items are packed in plastic bags in an atmosphere of nitrogen gas it does not spoil as nitrogen is an inert gas and does not react with the things. This is done to prevent the oxidation of fatty acids and oils present in the chips

ChemistryClass 10ICSE

The term used to indicate the development of unpleasant smell and taste in fat and oil containing food due to aerial oxidation is: (a) Acidity (b)Radioactivity (c)Rabidity (d)Rancidity

Option (d) is the answer. Rancidity is the term used to indicate the development of unpleasant smell and taste in fat and oil containing food due to aerial oxidation and it can be prevented by closely and tight packing of food items in a container which does not allows air to react.

ChemistryClass 10ICSE

The chemical reaction involved in the corrosion of iron metal is that of: (a) Oxidation as well as displacement (b) Reduction as well as combination (c) Oxidation as well as combination Reduction as well as displacement

Option (c) is the answer. Corrosion takes place when iron metal reacts with water and oxygen and form hydrated oxide and is an oxidation reaction as it is adding up of oxygen Iron metal combines with water and oxygen to corrode thus it is a combination reaction which further forms a single compound.

ChemistryClass 10ICSE

In the context of redox reactions, the removal of hydrogen from a substance is known as : (a) Oxidation (b) Dehydration (c) Reduction Dehydrogenation

Option (a) is the answer. In redox reaction both reduction and oxidation takes place and reduction is when hydrogen is added and oxidation is where hydrogen is removed

ChemistryClass 10ICSE

The removal of oxygen from a substance is called (a) Oxidation (b) Corrosion (c) Reduction Rancidity

Option (c) is correct. Reduction is the process of removal of oxygen from a substance and adding of hydrogen. It occurs when the oxidation of atoms decreases

ChemistryClass 10ICSE

What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? (b) Write the balanced chemical equation for the reaction which takes place. (c) State the physical conditions of reactants in which the reaction will not take place. (d) Name the type of chemical reaction which occurs. Give one example of another reaction which is of the same type as the above reaction.

When barium chloride solution is added to sodium sulphate solution, then a white precipitate of barium sulphate is formed alongwith sodium chloride solution. Na2SO4 + BaCl2 → BaSO4 + 2NaCl Solid sodium sulphate and Solid barium chloride Double displacement Silver nitrate solution and sodium chloride solution forms a white precipitate of silver chloride and sodium nitrate solution.

ChemistryClass 10ICSE

(a) Explain the term "rancidity". What damage is caused by rancidity? (b) What type of chemical reaction is responsible for causing rancidity? State and explain the various methods for preventing or retarding rancidity of food.

Rancidity is the process of slow oxidation of oil and fat present in the food materials resulting in the production of foul odor and taste in When fats and oils are oxidized, the food becomes rancid i.e., their smell and taste changes. Oxidation is the chemical reaction involved in this as it get exposed to air (i) Refrigerate cooked food at low temperatures Pack food items in air tight containers Prevention by adding anti-oxidants like BHA(Butylated hydroxyanisole) Storage of food away from light

ChemistryClass 10ICSE

Explain the term "corrosion" with an example. Write a chemical equation to show the process of corrosion of iron. (b) What special name is given to the corrosion of iron? (c) What type of chemical reaction is involved in the corrosion of iron? (d) Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.

Corrosion is a natural process that gradually destructs the materials by chemically or by electrochemical reaction within the environment. Corrosion occurs when most or all of the atoms on the same metal surface are oxidized and damaging the entire surface. Rusting of iron is the most common form of corrosion 4Fe + 3O2 + 2H2O → 2Fe2O3.xH2O Rusting Oxidation Statues, cars, buildings

ChemistryClass 10ICSE

What happens when a zinc strip is dipped into a copper sulphate solution? ( Write the equation for the reaction that takes place. Name the type of reaction involved.

Zinc sulphate Solution and copper are obtained when a strip of zinc metal is placed in copper Sulphate Solution. CuSO4(aq.) +Zn(s)→ ZnSO4(aq.) +Cu(s) Displacement reaction takes place where zinc metal displaces as zinc sulphate and copper sulphate to

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