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Exam Q1. The acidic nature of acids is due to the presence of: A. Hydrogen ions B. Chloride ions C. Sulphate ions D. Oxygen ions Q2. Adding water to concentrated acid is dangerous because: A. Heat may cause splashing B. Acid evaporates C. Acid neutralises D. Ions decrease Q3. Curd should not be stored in

Exam Q1. The chemical name of lime water is: A. Calcium hydroxide B. Calcium chloride C. Calcium carbonate D. Calcium oxide Q2. All metal carbonates react with acids to give: A. Salt and oxygen B. Salt and hydrogen C. Salt and base D. Salt, carbon dioxide and water Q3. Lime water test is used to

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:

Exam Q1. Copper will displace which metal from its salt solution? A. Iron B. Zinc C. Magnesium D. Silver Q2. The green coating on copper is: A. Copper chloride B. Copper sulphide C. Copper carbonate D. Copper oxide Q3. Iron does not rust in dry air because: A. Carbon dioxide is absent B. Oxygen is

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.

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

Exam Q1. In displacement reactions, a more reactive metal: A. Remains unchanged B. Forms precipitate C. Displaces a less reactive metal D. Gets displaced Q2. At ordinary temperature, magnesium is protected from further oxidation by: A. A water layer B. A hydroxide layer C. A thin oxide layer D. A sulphide layer Q3. Which metals

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