Exam Q1. Calcium hydroxide is written as: A. CaCO₃ B. CaCl₂ C. Ca(OH)₂ D. CaO Q2. Which of the following is an acid? A. NaOH B. Ca(OH)₂ C. NH₄OH D. HCl Q3. Which indicator works by smell change? A. Methyl orange B. Litmus C. Onion D. Turmeric Q4. Acids and bases neutralise each other because: […]
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Exam Q1. Gangue mainly consists of: A. Soil and sand B. Oxides only C. Metals D. Acids Q2. Brass is an alloy of: A. Iron and carbon B. Lead and tin C. Copper and zinc D. Copper and tin Q3. Metals obtained after extraction are generally: A. Alloys B. Impure C. Pure D. Liquid Q4.
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Exam Q1. Aluminium, iron and zinc react with: A. Cold water B. Steam C. Hot water D. Dilute acids only Q2. The reactivity series arranges metals in: A. Increasing density B. Alphabetical order C. Decreasing reactivity D. Increasing mass Q3. The decreasing order of reactivity with dilute acids is: A. Al > Mg > Zn
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