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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.

ChemistryClass 10ICSE

The aqueous solution of one of the following salt will turn phenolphthalein indicator pink. This salt is: (a) KCl (b) K2SO4 (c) K2CO3 (d) KNO3

Option (c) is the answer.

ChemistryClass 10ICSE

The salt whose aqueous solution will have no effect on either red litmus or blue litmus is (a) Potassium sulphate (b) Sodium carbonate (c) Ammonium sulphate Sodium acetate

Option (a) is the answer.

ChemistryClass 10ICSE

The aqueous solution of one of the following salt will turn red litmus to blue. This salt is: (a) Potassium sulphate (b) Sodium sulphate (c) Sodium chloride Potassium carbonate

Option (d) is the answer.

ChemistryClass 10ICSE

The salt whose aqueous solution will turn blue litmus to red is: (a) Ammonium sulphate (b) Sodium acetate (c) Sodium chloride Potassium carbonate

Option (a) is the answer.

ChemistryClass 10ICSE

The number of molecules of water of crystallisation present in washing soda crystals is: (a) Five (b) Two (c) Ten Seven

Option (c) is the answer.

ChemistryClass 10ICSE

The products of chlor-alkali process are: (a) NaCl, Cl2 , and H2 (b) Cl2 , H2 and NaOH (c) Cl2, Na2CO3 and H2O NaOH, Cl2 and HCl

Option (b) is the answer.

ChemistryClass 10ICSE

The salt which give a neutral solution on dissolving in water will be: (a) CH3COONa (b) NH4Cl (c) KCl (d) Na2CO3

Option (c) is the answer.

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