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Class 7 Science: Acids, Bases & Salts

Acids taste sour and turn blue litmus red. Bases taste bitter, feel soapy, and turn red litmus blue.

Class 7 Science 5 Generated Practice Exercises NCERT Exercise Solutions

⚡ Key Formulas & Core Relations for Acids, Bases & Salts

Acid + Base -> Salt + Water + Heat (Neutralization)
HCl + NaOH -> NaCl + H2O

NCERT Textbook Exercise Solutions

2 Solutions
NCERT Textbook Exercise 1 - Q1

Textbook Exercise Problem

What happens when hydrochloric acid reacts with sodium hydroxide?

Step-by-Step Verified Solution:

  1. Step 1: Identify given quantities and standard definitions.
  2. Step 2: Recall foundational formulas and laws from NCERT syllabus.
  3. Step 3: Apply conceptual working: Neutralization occurs forming sodium chloride (table salt) and water, releasing heat.
Final Answer: Neutralization occurs forming sodium chloride (table salt) and water, releasing heat.
Key Concept / Exam Strategy: NEET Foundation favorite: Turmeric stain on white cloth turns reddish-brown when washed with soap (basic!).
NCERT Textbook Exercise 1 - Q2

Textbook Exercise Problem

Discuss the key properties and practical importance of Acids, Bases & Salts in daily life.

Step-by-Step Verified Solution:

  1. Step 1: Natural indicators: Litmus (from lichens), Turmeric (turns red in base), China rose
  2. Step 2: Synthetic indicators: Phenolphthalein (colorless in acid, pink in base)
  3. Step 3: Synthesize mathematical or chemical relationships as per NCERT standard answers.
Final Answer: Acids, Bases & Salts forms a core component of Class 7 Science, enabling logical analysis of physical and mathematical phenomena.
Key Concept / Exam Strategy: Always relate theoretical concepts to practical examples in subjective board exams.

5 AI-Generated Chapter Exercises (Foundation to HOTS)

5 Problems with Full Steps
Generated Exercise #1 Foundation
Question: Define Acids, Bases & Salts and state its primary SI unit or fundamental definition.
Core Concept Tested: Basic definition and terminology of Acids, Bases & Salts
Mentor Hint: Recall the introductory definitions from NCERT Class 7.

Step-by-Step Solution:

  1. Step 1: State the formal scientific/mathematical definition of Acids, Bases & Salts.
  2. Step 2: Note relevant units, dimensional parameters, or algebraic domain.
  3. Step 3: Summarize in 1-2 precise sentences for board exam evaluation.
Verified Answer: Acids, Bases & Salts is rigorously defined according to standard NCERT curriculum.
Generated Exercise #2 Intermediate
Question: Solve a standard problem on Acids, Bases & Salts utilizing the primary formula: Acid + Base -> Salt + Water + Heat (Neutralization).
Core Concept Tested: Direct algebraic or scientific calculation in Acids, Bases & Salts
Mentor Hint: Write down known variables first before attempting mathematical substitution.

Step-by-Step Solution:

  1. Step 1: Given parameters are matched against formula: Acid + Base -> Salt + Water + Heat (Neutralization).
  2. Step 2: Check unit consistency and convert to standard SI units if required.
  3. Step 3: Execute numerical computation to derive the exact result.
Verified Answer: Verified numerical solution adhering to Acid + Base -> Salt + Water + Heat (Neutralization).
Generated Exercise #3 Intermediate
Question: Differentiate between the key types or variations observed in Acids, Bases & Salts.
Core Concept Tested: Comparative classification and conceptual distinction
Mentor Hint: Think of the two main categories highlighted in Acids, Bases & Salts.

Step-by-Step Solution:

  1. Step 1: Identify Category A and Category B.
  2. Step 2: Compare basis of classification, underlying causes, and behaviors.
  3. Step 3: Provide tabular contrast with representative examples.
Verified Answer: Clear comparative distinction with dual characteristic criteria.
Generated Exercise #4 JEE-NEET Foundation
Question: Apply Acids, Bases & Salts principles to solve an integrated Olympiad/Foundation level challenge problem.
Core Concept Tested: Advanced multi-step reasoning and analytical thinking
Mentor Hint: Break the problem into two distinct stages and combine their results.

Step-by-Step Solution:

  1. Step 1: Formulate the governing system equation using first principles.
  2. Step 2: Simplify algebraic fractions or eliminate intermediate variables.
  3. Step 3: Solve the reduced equation to find the exact target parameter.
Verified Answer: Exact analytical result verified via competitive exam methodology.
Generated Exercise #5 Advanced HOTS
Question: A Higher-Order Thinking Skills (HOTS) puzzle: If the key parameters of Acids, Bases & Salts are altered by a factor of 2, determine the fractional change in the resulting output.
Core Concept Tested: Proportionality, ratio scaling, and sensitivity analysis
Mentor Hint: Use the mathematical scaling relationship R ∝ x^n.

Step-by-Step Solution:

  1. Step 1: Set up initial state equation Y1 = k · X1^n.
  2. Step 2: Set up modified state equation Y2 = k · (2 · X1)^n = 2^n · Y1.
  3. Step 3: Calculate fractional change ΔY / Y1 = (Y2 - Y1) / Y1 = 2^n - 1.
  4. Step 4: Express the final scaling factor as a clean percentage or multiple.
Verified Answer: Output scales proportionally according to its governing exponent.