Acids, Bases and Salts
Gujarat Board · Class 10 · Science
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Which of the following substances turns red litmus paper blue?
What gas is evolved when an acid reacts with a metal?
The pH value of a neutral solution is:
What happens when copper sulphate crystals are heated?
Sample Questions
Which of the following are natural indicators? (Select all correct answers)
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Litmus, Turmeric, Red cabbage
Litmus (from lichen), turmeric, and red cabbage are natural indicators that change color in acidic or basic solutions. Phenolphthalein and methyl orange are synthetic indicators made in laboratories.
Which of the following reactions represent neutralization? (Select all correct answers)
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HCl + NaOH → NaCl + H₂O, H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Neutralization reactions occur when an acid reacts with a base to form salt and water only. The other reactions involve metal with acid and metal carbonate with acid respectively.
Which of the following substances are used as antacids? (Select all correct answers)
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Baking soda, Milk of magnesia
Antacids are basic substances that neutralize excess stomach acid. Baking soda (NaHCO₃) and milk of magnesia [Mg(OH)₂] are mild bases used as antacids. Lemon juice and vinegar are acidic.
The chemical name of baking soda is:
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Sodium hydrogencarbonate
Baking soda is sodium hydrogencarbonate (NaHCO₃). It is different from washing soda which is sodium carbonate (Na₂CO₃).
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