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ChemistryClass 10ICSE

Write complete balanced equations for the following reactions: (a) Calcium (solid) + Water (liquid) →Calcium hydroxide (solution) + Hydrogen (gas) Sulphur dioxide (gas) + Oxygen (gas) → Sulphur trioxide (gas)

Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g) 2SO2 (g) + O2 (g) → 2SO3 (g)

ChemistryClass 10ICSE

1. Correct and balance the following equations: (i) Ca + H2O → CaOH + H (ii) N + H → NH3

Ca + 2H2O → Ca(OH)2 + H2 N2 + 3H2 →2NH3

ChemistryClass 10ICSE

Complete and balance the following equations: (a) NaOH + → Na2SO4 + H2O (b) Ca(OH)2 + → CaCO3 + H2O

2NaOH + H2SO4 → Na2SO4 + 2H2O Ca(OH)2 + CO2 → CaCO3 + H2O

ChemistryClass 10ICSE

Write the balanced chemical equations for the following reactions: (a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water (b) Aluminium + Copper chloride → Aluminium chloride + Copper

Ca(OH)2 + CO2 → CaCO3 + H2O 2Al + 3CuCl2 → 2AlCl3 + 3Cu

ChemistryClass 10ICSE

Translate the following statements into chemical equations and then balance the equations: (a) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (b) Phosphorus burns in oxygen to give phosphorus pentoxide. (c) Carbon disulphate burns in air to give carbon dioxide and sulphur dioxide. (d) Aluminium metal replaces iron from ferric oxide, Fe2O3, giving aluminium oxide and iron. (e) Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.

2H2S + 3O2 → 2H2O + 2SO2 P4 + 5O2 → 2P2O5 CS2 + 3O2 → CO2 + 2SO2 2Al + Fe2O3 →Al2O3 + 2Fe BaCl2 + ZnSO4 →ZnCl2 + BaSO4

ChemistryClass 10ICSE

How will you indicate the following effects in a chemical equation? (a) A solution made in water (b) Exothermic reaction Endothermic reaction

The solution made in water can be indicated by the symbol (aq) which shows it is aqueous An exothermic reaction can be indicated by Heat, heat energy or energy on the product side An endothermic reaction can be indicated by Heat, heat energy or energy on the reactant side

ChemistryClass 10ICSE

Why is photosynthesis considered an endothermic reaction?

Endothermic reactions are those which heat is absorbed in the reaction. As we know that photosynthesis is a process that green plants and some other organisms use sunlight to synthesize food from carbon dioxide and water and turns to oxygen and glucose. Plants absorb direct energy from sun thus considered photosynthesis as endothermic reaction

ChemistryClass 10ICSE

What does the symbol (aq) represent in a chemical equation?

In a chemical equation (aq) always represents for aqueous solution

ChemistryClass 10ICSE

What is wrong with the following chemical equation? Mg + O → MgO Correct and balance it.

Oxygen should be in molecular form, O2 2Mg + O2 → 2MgO

ChemistryClass 10ICSE

State whether the following statement is true or false: A chemical equation can be balanced easily by altering the formula of a reactant or product.

False

ChemistryClass 10ICSE

Why should magnesium ribbon be cleaned before burning in air?

Magnesium ribbon is made up of pure magnesium metal and it is highly reactive with oxygen which further leads to the oxidation of magnesium when it comes in contact with air. On the surface of the magnesium ribbon it forms a layer of oxide and act as a protective layer. So it is necessary to clean the magnesium ribbon before burning in air

ChemistryClass 10ICSE

What happens chemically when quicklime is added to water filled in a bucket?

Quick lime is chemically calcium oxide. When it is added to water filled in a bucket, it forms calcium hydroxide (slaked lime) and reacts vigorously by releasing large amount of heat which is an exothermic reaction.

ChemistryClass 10ICSE

On what basis is a chemical equation balanced?

A chemical equation is always balanced by comparing the number of atoms of each element on reactant side as well as product side. It is based on the Law of conservation of mass, i.e. number of atoms on the left hand side should be equal to the right hand side

ChemistryClass 10ICSE

Why is respiration considered as an exothermic process?

Exothermic reaction is a reaction in which the energy is liberated. In the process of respiration, energy is released thus considered as an exothermic reaction

ChemistryClass 10ICSE

Which of the following salt will give an aqueous solution having pH of almost 7? (a) NH4NO3 (b) NH4Cl (c) CaCl2 KCl

Option (d) is the answer.

ChemistryClass 10ICSE

A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of the solution is less than 7, the salt is most likely to be: (a) CH3COONa (b) Na2CO3 (c) KCl (d) NH4Cl

Option (d) is the answer.

ChemistryClass 10ICSE

A salt whose aqueous solution will have a pH of more than 7 will be: (a) K2CO3 (b) K2SO4 (c) NaCl (d) NH4Cl

Option (a) is the answer.

ChemistryClass 10ICSE

Plaster of paris is prepared by heating one of the following to a temperature of 100℃. This is: (a) CaSO3.2H2O (b) CaCl2.2H2O (c) CaCO3.2H2O (d) CaSO4.2H2O

Option (d) is the answer.

ChemistryClass 10ICSE

The formula of baking soda is: (a) K2CO3 (b) KHCO3 (c) NaHCO3 (d) KNO3

Option (c) is the answer.

ChemistryClass 10ICSE

Which of the following is treated with chlorine to obtain bleaching powder? (a) CaSO4 (b) Ca(OH)2 (c) Mg(OH)2 (d) KOH

Option (b) is the answer.

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