Common General Science

Chemistry — Reactions, Elements, Compounds

15 questions on chemical reactions, periodic table, acids-bases, metals-nonmetals.

15 questions · 10 minutes

10:00

Q1.Rusting of iron is:

A. Reduction B. Oxidation C. Sublimation D. Neutralisation

Q2.The most abundant metal in Earth's crust is:

A. Iron B. Copper C. Aluminium D. Gold

Q3.Acid + Base →

A. Salt + Water B. Salt + Gas C. Water + Gas D. Metal + Water

Q4.The pH of lemon juice is approximately:

A. 2-3 B. 7 C. 9-10 D. 14

Q5.Which metal is stored in kerosene?

A. Gold B. Sodium C. Iron D. Copper

Q6.The gas produced when acid reacts with metal is:

A. Oxygen B. Nitrogen C. Hydrogen D. Carbon Dioxide

Q7.Plaster of Paris is:

A. CaCO₃ B. CaSO₄·½H₂O C. Ca(OH)₂ D. CaO

Q8.Bleaching powder is:

A. NaOCl B. Ca(OCl)₂ C. NaHCO₃ D. CaCO₃

Q9.The non-metal that is liquid at room temperature is:

A. Mercury B. Bromine C. Iodine D. Phosphorus

Q10.Galvanisation is coating iron with:

A. Copper B. Tin C. Zinc D. Chromium

Q11.The gas responsible for global warming is:

A. Oxygen B. Nitrogen C. Carbon Dioxide D. Helium

Q12.Aqua regia is a mixture of:

A. HCl + HNO₃ B. H₂SO₄ + HCl C. HNO₃ + H₂SO₄ D. HCl + CH₃COOH

Q13.The gas used in welding is:

A. Oxygen B. Acetylene C. Nitrogen D. Hydrogen

Q14.Washing soda formula is:

A. NaCl B. NaHCO₃ C. Na₂CO₃ D. NaOH

Q15.Vinegar contains:

A. HCl B. Citric acid C. Acetic acid D. Tartaric acid

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