Some examples from this set of practice questions
1.
Here are the top 20 questions from chapter 2, Acids, Bases, and Salts, from the 10th grade science curriculum ¹: *Short Answer Type Questions* 1. Name the acid present in tomato, vinegar, and tamarind. 2. Describe the method of mixing water and sulphuric acid. 3. Explain how antacids work. 4. Define olfactory indicators and name two substances that can be used as olfactory indicators. 5. Identify strong acids from the following: CH3COOH, H2SO4, H2CO3, HNO3.
Answer: Here are the answers:- 1. Oxalic acid (tomato), Acetic acid (vinegar), Tartaric acid (tamarind) 2. Water should be slowly added to sulphuric acid with constant stirring, as adding sulphuric acid to water can cause splashing and spillage. 3. Antacids (like milk of magnesia) work by neutralizing excess stomach acid, relieving heartburn and indigestion. 4. Olfactory indicators are substances that change smell when pH changes. Two examples are onion and vanilla. 5. H2SO4 (sulphuric acid) and HNO3 (nitric acid) are strong acids, while CH3COOH (acetic acid) and H2CO3 (carbonic acid) are weak acids. Let me know if you need help with anything else!
2.
Explain why hydrochloric acid is a strong acid and acetic acid is a weak acid, and how it can be verified.
Answer: Here\'s the answer to question above:- Answer: Hydrochloric acid (HCl) is a strong acid because it completely dissociates in water, releasing all its hydrogen ions (H+). Acetic acid (CH3COOH), on the other hand, is a weak acid because it only partially dissociates in water, releasing only some of its hydrogen ions. This can be verified by measuring the pH of the solutions, conducting titration experiments, or observing the reactions with indicators like litmus paper.
3.
Name the acid present in tomato, vinegar etc.....
Answer: Oxalic acid and acetic acid
4.
Describe the method of mixing water and Sulphuric acid in detail
Answer: Mixing water and sulfuric acid requires caution and careful technique to avoid accidents and ensure safety. Here\'s a step-by-step guide on how to mix water and sulfuric acid: 1. *Prepare the necessary materials*: - Sulfuric acid (H2SO4) - Distilled water - A clean, dry glass or plastic container with a wide mouth (at least 2-3 times larger than the volume of acid) - A glass stirring rod or spoon - Protective gear (gloves, goggles, lab coat) 2. *Choose the correct order*: - Always add water to sulfuric acid, never the reverse. This prevents splashing and reduces the risk of acid splashing onto skin or surfaces. 3. *Start with a small amount*: - Begin with a small amount of sulfuric acid (about 10-20 mL) to minimize the risk of splashing and spills. 4. *Slowly add water*: - Hold the container at an angle and slowly pour water into the acid while gently stirring with the glass rod or spoon. - Add water in small increments (about 1-2 mL at a time), allowing each portion to mix thoroughly before adding more. 5. *Stir and mix*: - Continue stirring and mixing until the solution is homogeneous and the desired concentration is reached. 6. *Monitor temperature*: - Be aware of the temperature change during mixing, as the reaction can release heat. 7. *Handle with care*: - Always handle the mixture with caution, as it can still be corrosive and hazardous. Remember to follow proper safety protocols, including wearing protective gear and working in a well-ventilated area. If you\'re unsure or uncomfortable mixing water and sulfuric acid, consult with a qualified professional or seek guidance from a trusted resource.
5.
How antacids work??
Answer: Antacids work by neutralizing excess stomach acid, relieving heartburn, indigestion, and upset stomach. Here\'s a step-by-step explanation of how antacids work: 1. _Stomach Acid Production_: The stomach produces hydrochloric acid (HCl) to digest food. 2. _Excess Acid_: When excess HCl is produced, it can flow back up into the esophagus, causing heartburn and discomfort. 3. _Antacid Intake_: Antacids (like Tums, Rolaids, or Mylanta) are ingested to neutralize excess stomach acid. 4. _Neutralization Reaction_: Antacids contain bases like calcium carbonate (CaCO3), magnesium hydroxide (Mg(OH)2), or aluminum hydroxide (Al(OH)3). These bases react with excess HCl to form water and salt: CaCO3 + 2HCl → CaCl2 + H2O Mg(OH)2 + 2HCl → MgCl2 + 2H2O Al(OH)3 + 3HCl → AlCl3 + 3H2O 1. _pH Balance_: The neutralization reaction helps balance the pH in the stomach and esophagus, reducing acidity and relieving discomfort. 2. _Symptom Relief_: Antacids provide quick relief from heartburn, indigestion, and upset stomach, allowing for comfortable digestion. Remember, antacids only provide temporary relief and may not address underlying conditions. If symptoms persist, consult a healthcare professional for proper diagnosis and treatment.
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