Consider the following statements: 1. Salts can be acidic, basic, or neutral in nature. 2. Neutralization results in the formation of salt and hydrogen gas. 3. A substance that turns red litmus blue is basic. Which of the statements given above is/are correct?

The correct option is (c). Explanation Acids and bases react chemically to form salts. The specific properties of the resulting salt depend on the relative strengths of the reacting acid and base. Indicators are substances used to determine the acidic or basic nature of a solution. - Statement 1 is correct: Salts are ionic compounds produced by the neutralization reaction between an acid and a base. They can be classified into three types based on the strength of the parent acid and base: - Neutral Salts: Formed by a strong acid and a strong base (e.g., Sodium Chloride, NaCl). - Acidic Salts: Formed by a strong acid and a weak base (e.g., Ammonium Chloride, NH4Cl). - Basic Salts: Formed by a weak acid and a strong base (e.g., Sodium Carbonate, Na2CO3). - Statement 2 is incorrect: A neutralization reaction is defined as the reaction between an acid and a base to produce salt and water, accompanied by the evolution of heat. Hydrogen gas is typically evolved when an acid reacts with a metal, not during neutralization. - Statement 3 is correct: Litmus is a common acid-base indicator. Bases turn red litmus paper blue, while acids turn blue litmus paper red. Key Takeaway: Neutralization reactions invariably produce salt and water. The nature of the salt (acidic, basic, or neutral) depends on the strength of the reactants. Bases are identified by their ability to turn red litmus blue.

Consider the following statements: 1. Salts… - NCERT Class 7 Science MCQ

NCERT Class 7 Science — Chapter 1: Acids, bases and salts

mcqeasy

Consider the following statements:

Salts can be acidic, basic, or neutral in nature.
Neutralization results in the formation of salt and hydrogen gas.
A substance that turns red litmus blue is basic.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 44

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

Acids and bases react chemically to form salts. The specific properties of the resulting salt depend on the relative strengths of the reacting acid and base. Indicators are substances used to determine the acidic or basic nature of a solution.

Statement 1 is correct: Salts are ionic compounds produced by the neutralization reaction between an acid and a base. They can be classified into three types based on the strength of the parent acid and base:
- Neutral Salts: Formed by a strong acid and a strong base (e.g., Sodium Chloride, NaCl).
- Acidic Salts: Formed by a strong acid and a weak base (e.g., Ammonium Chloride, NH₄Cl).
- Basic Salts: Formed by a weak acid and a strong base (e.g., Sodium Carbonate, Na₂CO₃).
Statement 2 is incorrect: A neutralization reaction is defined as the reaction between an acid and a base to produce salt and water, accompanied by the evolution of heat. Hydrogen gas is typically evolved when an acid reacts with a metal, not during neutralization.
Statement 3 is correct: Litmus is a common acid-base indicator. Bases turn red litmus paper blue, while acids turn blue litmus paper red.

Key Takeaway: Neutralization reactions invariably produce salt and water. The nature of the salt (acidic, basic, or neutral) depends on the strength of the reactants. Bases are identified by their ability to turn red litmus blue.

Your note

More from Chapter 1: Acids, bases and salts

With reference to the chemical nature of substances, consider the following statements: 1. All substances that taste sour contain acids. 2. Substances that taste bitter and feel soapy on touching are generally acidic in nature. 3. Baking soda is an example of a substance that has a bitter taste and is basic in chemical nature. Which of the statements given above is/are correct?

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Consider the following statements regarding the preparation of indicators: 1. Litmus is obtained from a plant called Pitcher plant. 2. Turmeric paper is made by depositing turmeric paste on blotting paper. 3. China rose indicator is prepared by keeping petals in warm water. Which of the statements given above is/are correct?

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Which one of the following acids is primarily responsible for the sour taste of unripe mangoes?

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With reference to the use of Calamine solution, consider the following statements: 1. It is used to treat skin irritation caused by ant bites. 2. It contains Calcium carbonate. 3. It is applied on the skin to neutralize the effect of wasp stings. Which of the statements given above is/are correct?

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