Acids, Bases and Salts-Chemical Properties of Acids and Bases (CBSE (Central Board of Secondary Education- Board Exam) Class-10 Science): Questions 1 - 12 of 27
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Question number: 1
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Describe in Detail
Write a note on classification of bases.
Explanation
1. On the basis of their strength, bases are classified as:
Strong bases: Strong bases are those bases which completely dissociate into its ions in aqueous solutions. Example: sodium hydroxide (NaOH), potassium hydroxide (KOH). Weak bases: Weak bases are those bases which do not completely dissociate into its ions in aqueous solutions. For exampl
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Question number: 2
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » How Do Acids and Bases React with Metals?
Write in Short
With the help of a well labelled diagram, show the process of reaction of acids with metals.
Question number: 3
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » How Do Acids and Bases React with Each Other?
Write in Brief
Define dilution.
Question number: 4
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Describe in Detail
Write down the chemical properties of bases?
Explanation
Chemical properties of Bases:
i) Reaction with Metals - Certain reactive metals such as Zinc, Aluminium, and Tin react with alkali solutions on heating and hydrogen gas is evolved.
2NaOH + Zn – > Na + 2 ZnO2 +H2
ii) Reaction with acids -Bases react with acids to form salt and water. KOH + HCl – > KCl + H2O
iii) Reaction with Non -metallic oxi
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Question number: 5
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Write in Brief
Why acids do not show acidic behaviour in absence of water?
Question number: 6
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Describe in Detail
Write down the chemical properties of acids?
Explanation
Chemical properties of acids:
i) Acids react with active metals to give hydrogen gas. Zn + H2SO4 – > ZnSO4 + H2
ii) Acids react with metal carbonate and metal hydrogen carbonate to give carbon dioxide. NaHCO3 +HCl – > NaCl + H2O + CO2
iii) Acids react with bases to give salt and water. This reaction is called as neutralization reaction. NaOH
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Question number: 7
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » How Do Acids and Bases React with Each Other?
Write in Short
Give an account of neutralisation reaction.
Question number: 8
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Write in Short
What are the properties of acids?
Question number: 9
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Reaction of Metallic Oxides with Acids
Write in Brief
The oxide of a metal X was water soluble, when a blue litmus strip was dipped in this solution, it did not go any change in colour. Predict the nature of oxide?
Question number: 10
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » How Do Acids and Bases React with Each Other?
Write in Short
What is neutralisation reaction?
Question number: 11
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Write in Brief
Name the acid produced by our stomach.
Question number: 12
» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Acids and Bases in the Laboratory
Write in Short
In one of the industrial process used for manufacture of sodium hydroxide, a gas A is formed as by product of the reaction. The gas A reacts with lime water to give a compound B which is used as a bleaching agent in chemical industry. Identify A and B giving the chemical equation of the reaction.